JP2015041518A - Photometric measurement stability evaluation method for lighting equipment, photometric measurement stability evaluation apparatus, photometric measurement stability evaluation program, and recording medium thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for evaluation of luminous quantity measurement stability, a device for evaluation of luminous quantity measurement stability, a program for evaluation of luminous quantity measurement stability and a recording medium therefor, by which light source characteristics of a luminaire with a heat radiating structure can be made clear, and the evaluation of the stability in measuring luminous quantities of such a luminaire can be performed with good accuracy.SOLUTION: A method for evaluation of luminaire's luminous quantity measurement stability comprises the steps of: calculating luminous flux value variation characteristic parameters including an initial luminous flux value Φ, a quantity of the change in a luminous flux value ΔΦ and a time constant τfrom luminous flux values of an LED luminaire based on [Formula 1]; calculating a stationary value Φof luminous flux of the LED luminaire based on [Formula 4]; and calculating a degree e(t) of luminous flux value output stability which is a result of comparison between the stationary value Φand the luminous flux value based on [Formula 2].

Description

  The present invention relates to a photometric measurement stability evaluation method, a photometric measurement stability evaluation apparatus, and a photometric measurement stability that evaluates the stability of output when measuring a photometric quantity (luminous flux, luminous intensity, illuminance, luminance) of a lighting fixture. The present invention relates to a sex evaluation program and its recording medium.

  Conventionally, as a device for measuring the total luminous flux of a lighting fixture such as a fluorescent lamp, an incandescent lamp, and an LED (Light Emitting Diode), there is a total luminous flux measuring device described in Patent Document 1 below. This total luminous flux measurement apparatus measures the total luminous flux of a lighting fixture using a hemispherical optical integrator. Such measurement of the total luminous flux is important in evaluating the luminous efficiency of the luminaire, and it is necessary to carry out in a state where the output from the luminaire is stabilized. Therefore, this stability evaluation method is JIS standard (JIS C 8105-5).

  According to this JIS standard (JIS C 8105-5), “the lighting fixture and the light distribution measuring device are sufficiently preheated and measured to be stable. The lighting fixture and the light distribution measuring device are stable. In order to confirm this, for example, it is good to take measures such as measuring the luminous intensity at intervals of 5 minutes, etc. If the change in the luminous intensity of three consecutive times becomes 1% or less, it is considered stable. ing.

JP 2010-271235 A

  However, the stability evaluation method based on the JIS standard (JIS C 8105-5) described above is intended for fluorescent lamps and incandescent lamps whose standards are relatively uniform, and therefore, is a relatively new technology for LED lighting fixtures. Not familiar with the evaluation. In other words, LED lighting fixtures with different heat dissipation structures depending on the type and manufacturer have different ways of lowering the temperature for each LED lighting fixture, so the time until the output stabilizes differs individually, and it conforms to the JIS standard (JIS C 8105-5). Accordingly, when the total luminous flux of the LED lighting apparatus is measured at regular intervals, the stability evaluation may not be performed accurately. For example, according to this standard, the error between the total luminous flux value and the steady value increases as the time constant of the LED lighting apparatus increases (see FIG. 1).

  The present invention has been proposed in view of the above circumstances. That is, for example, the light source characteristics of a lighting fixture equipped with a heat dissipation structure, such as an LED lighting fixture, can be clarified, and the stability of the lighting fixture can be measured accurately. It is an object to provide a measurement stability evaluation method, a photometric measurement stability evaluation apparatus, a photometric measurement stability evaluation program, and a recording medium thereof.

In order to achieve the above object, the photometric measurement stability evaluation method according to the present invention provides an initial photometric quantity Φ ₀ , photometric measurement from a photometric quantity including any one of a luminous flux value, luminous intensity, illuminance, and luminance of a lighting fixture. A photometric quantity variation characteristic parameter including a quantity change amount ΔΦ and a time constant τ _lm is calculated based on [Equation 1], and the photometric quantity is measured in a stable state. The evaluation is based on the fluctuation characteristic parameter.

The light quantity measurement stability evaluation method according to the present invention calculates a steady value Φ _∞ of the light measurement amount of the lighting fixture, and compares the steady value Φ _∞ with the light measurement amount. Is calculated based on [Equation 2].

  The light quantity measurement stability evaluation method according to the present invention is characterized in that a contribution rate to the fitting of the light quantity variation characteristic parameter is calculated.

The light quantity measurement stability evaluation method according to the present invention calculates from the time constant τ _lm a measurement interval Δt for measuring the light quantity of the lighting fixture in a stable state based on [Equation 3]. Features.

In the photometric measurement stability evaluation apparatus according to the present invention, the photometric quantity variation characteristic parameters including the initial photometric quantity Φ ₀ , the photometric quantity change ΔΦ, and the time constant τ _lm are calculated from [Equation 1] ] And a photometric light quantity fluctuation characteristic parameter calculation unit for calculating a steady-state value Φ _∞ of the luminaire, and a photometric output stability e that compares the steady value Φ _∞ with the photometric quantity (T) is provided with the stability calculation part calculated based on [Formula 2], It is characterized by the above-mentioned.

  The photometric quantity measurement stability evaluation device according to the present invention is characterized by comprising a contribution rate calculation unit for calculating a contribution rate to the fitting of the photometric quantity variation characteristic parameter.

The light quantity measurement stability evaluation device according to the present invention is a measurement interval calculation unit in which a measurement interval Δt at which the light measurement is measured in a stable state is calculated from the time constant τ _lm based on [Equation 3]. Is provided.

The photometric quantity measurement stability evaluation program according to the present invention calculates the photometric quantity variation characteristic parameters including the initial photometric quantity Φ ₀ , the change quantity ΔΦ of the photometric quantity, and the time constant τ _lm from the photometric quantity of the lighting fixture [Formula 1 ], A procedure for calculating the steady-state value Φ _∞ of the lighting fixture, and a photometric output stability e (t) comparing the steady-state value Φ _∞ with the photometric amount [ And causing the computer to execute the procedure of calculating based on the equation (2).

  The recording medium according to the present invention is characterized in that a photometric measurement stability evaluation program is recorded.

[Formula 1]

[Formula 2]

[Formula 3]

  The photometric measurement stability evaluation method according to the present invention has the above-described configuration. With this configuration, the characteristic value of the luminaire is represented by the light measurement value variation characteristic parameter. Therefore, the light source performance of the lighting fixture is clarified, and the stability can be accurately evaluated when measuring the photometric quantity of the lighting fixture.

  Further, the convergence value can be predicted at an early stage by calculating the photometric quantity variation characteristic parameter by sequentially performing the fitting process using [Equation 1].

The light quantity measurement stability evaluation method according to the present invention calculates a steady value Φ _∞ of a light measurement amount of a lighting fixture, and calculates a light measurement output stability e (t) obtained by comparing the steady value Φ _∞ with the light measurement amount [formula 2]. With this configuration, photometric or steady-state value [Phi _∞ of, and the time to reach a steady-state value [Phi _∞ become apparent. Moreover, steady-state value [Phi _∞ is compared with the photometric as an evaluation criterion for stability, it is intended that metering amount is measured in a stable state is evaluated from the photometric quantity output stability e (t). Therefore, it is possible to evaluate the stability at the time of measuring the light metering amount of the lighting fixture with higher accuracy.

  The light quantity measurement stability evaluation method according to the present invention calculates a contribution rate to fitting of a light measurement quantity variation characteristic parameter. Therefore, it is possible to accurately evaluate the stability when measuring the light quantity of the lighting fixture with high reliability.

The light quantity measurement stability evaluation method according to the present invention calculates, based on [Equation 3], a measurement interval Δt for measuring light measurement of a lighting fixture in a stable state from a time constant τ _lm . Therefore, it is possible to calculate an appropriate value corresponding to each lighting fixture with respect to the measurement interval Δt when the photometric quantity is measured.

In the photometric measurement stability evaluation apparatus according to the present invention, the photometric quantity variation characteristic parameters including the initial photometric quantity Φ ₀ , the photometric quantity change ΔΦ, and the time constant τ _lm are calculated from [Equation 1] ], And a light measurement quantity variation characteristic parameter calculation unit for calculating a steady-state value Φ _∞ of the luminaire, and a light measurement output stability e (t) comparing the steady value Φ _∞ with the light measurement quantity Is provided with a stability calculation unit that is calculated based on [Equation 2]. With this configuration, similarly to the photometric measurement stability evaluation method described above, characteristic values of the luminaire is represented by photometric variation characteristic parameter, photometric constant value [Phi _∞ or time and to reach a steady-state value [Phi _∞ It becomes clear. Moreover, steady-state value [Phi _∞ is compared with the photometric as an evaluation criterion for stability, it is intended that metering amount is measured in a stable state is evaluated from the photometric quantity output stability e (t). Therefore, the light source performance of the lighting fixture is clarified, and the stability can be accurately evaluated when measuring the photometric quantity of the lighting fixture.

  The photometric quantity measurement stability evaluation apparatus according to the present invention includes a contribution rate calculation unit that calculates a contribution rate to fitting of a photometric quantity variation characteristic parameter. Therefore, it is possible to accurately evaluate the stability when measuring the light quantity of the lighting fixture with high reliability.

The light quantity measurement stability evaluation apparatus according to the present invention includes a measurement interval calculation unit that calculates, based on [Equation 3], a measurement interval Δt at which light measurement is measured in a stable state from a time constant τ _lm. It has been. Therefore, it is possible to calculate an appropriate value according to the lighting fixture with respect to the measurement interval Δt when the photometric quantity is measured.

The photometric quantity measurement stability evaluation program according to the present invention calculates the photometric quantity variation characteristic parameters including the initial photometric quantity Φ ₀ , the change quantity ΔΦ of the photometric quantity, and the time constant τ _lm from the photometric quantity of the lighting fixture [Formula 1 ], A procedure for calculating the steady-state value Φ _∞ of the luminaire, and a photometric output stability e (t) comparing the steady value Φ _∞ with the photometric amount [Equation 2] The computer calculates the procedure based on the above. With this configuration, similarly to the photometric measurement stability evaluation method described above, characteristic values of the luminaire is represented by photometric variation characteristic parameter, photometric constant value [Phi _∞ or time and to reach a steady-state value [Phi _∞ It becomes clear. Moreover, steady-state value [Phi _∞ is compared with the photometric as an evaluation criterion for stability, it is intended that metering amount is measured in a stable state is evaluated from the photometric quantity output stability e (t). Therefore, the light source performance of the lighting fixture is clarified, and the stability can be accurately evaluated when measuring the photometric quantity of the lighting fixture.

The recording medium storing the photometric measurement stability evaluation program according to the present invention stores the photometric measurement stability evaluation program. With this configuration, similarly to the photometric measurement stability evaluation program described above, characteristic values of the luminaire is represented by photometric variation characteristic parameter, photometric constant value [Phi _∞ or time and to reach a steady-state value [Phi _∞ It becomes clear. Moreover, compared with the photometric amount as an evaluation criterion of stability constant value, it is intended that photometric [Phi _∞ was measured in a stable state is evaluated from the photometric quantity output stability e (t). Therefore, the light source performance of the lighting fixture is clarified, and the stability can be accurately evaluated when measuring the photometric quantity of the lighting fixture.

Explaining the error of the measured value by the conventional evaluation method, (a) is a luminous flux value-time characteristic diagram for each lighting fixture having a different time constant, and (b) is a total luminous flux value and a steady value for each lighting fixture having a different time constant. FIG. It is a light beam value-temperature characteristic diagram explaining derivation of the photometric quantity variation characteristic parameter of the present invention. It is a permissible fluctuation rate-time characteristic diagram for explaining derivation of the measurement interval of the present invention. It is a measurement interval / time constant-allowable fluctuation rate characteristic diagram for explaining derivation of the measurement interval of the present invention. It is a measurement interval-time constant characteristic view explaining the measurement interval of the present invention. It is a schematic block diagram which shows the outline of a structure of the photometric measurement stability evaluation apparatus which concerns on embodiment of this invention. It is a flowchart which shows the flow of a process of the light quantity measurement stability evaluation apparatus which concerns on embodiment of this invention. It is a flowchart which shows the flow of a process by the contribution rate calculation part of the photometric measurement stability evaluation apparatus which concerns on embodiment of this invention. The first embodiment of the present invention will be described, wherein (a) is a total luminous flux-time characteristic diagram, and (b) is a list of photometric quantity variation characteristic parameters and contribution rates. The second embodiment of the present invention will be described, wherein (a) is a total luminous flux-time characteristic diagram, and (b) is a photometric quantity variation characteristic parameter and contribution rate list. The third embodiment of the present invention will be described, wherein (a) is a total luminous flux-time characteristic diagram, and (b) is a list of photometric quantity variation characteristic parameters and contribution rates. The fourth embodiment of the present invention will be described, wherein (a) is a total luminous flux-time characteristic diagram, and (b) is a list of photometric quantity variation characteristic parameters and contribution rates.

  Below, the photometric measurement stability evaluation method which concerns on embodiment of this invention is demonstrated. An object to be measured by the photometric measurement stability evaluation method is a lighting fixture provided with a heat dissipation structure such as a heat sink, for example, an LED lighting fixture. In the following description, the “photometric amount” is described as a luminous flux (total luminous flux). However, the “photometric amount” includes a luminous flux (including the total luminous flux), luminous intensity, illuminance, and luminance. .

  In the luminous flux measurement stability evaluation method as the photometric measurement stability evaluation method according to the present embodiment, the stability when measuring the luminous flux using the model formula of the luminous flux time variation characteristic representing the time passage of the luminous flux of the LED lighting fixture is used. Perform sex assessment. That is, it is evaluated that the light flux value is measured in a state where the LED lighting apparatus is stable. Here, the stable state means a steady state or a state close to a steady state. The model formula of the light flux time variation characteristic is derived from the following consideration.

In many LED lighting fixtures, the temperature is affected by three factors: a heat source (PN junction), a heat radiating part (for example, a heat sink, a heat radiating fan, an internal circuit, etc.), and an environment (environmental temperature such as atmospheric heat). Relax from ambient temperature to steady state with thermal time constant τ _th . From this, the temperature fluctuation characteristic of the LED lighting apparatus is represented by [Formula 5] shown below.

[Formula 5]

Here, for each variable, T (t) is the temperature of the heat source at an arbitrary time t, T ₀ is the initial temperature (environmental temperature), ΔT is the amount of temperature change that reaches a steady state, and τ _th is the thermal time constant.

  Since the luminous flux value and the temperature of the LED lighting fixture are in an inversely proportional relationship (see FIG. 2), from [Equation 5], the luminous flux time variation characteristic and the steady value (the luminous flux value when the temperature is sufficiently stabilized) It is predicted to be expressed by the following [Formula 1] and [Formula 4].

[Formula 1]

[Formula 4]

Here, as for each variable, Φ (t) is a luminous flux value (light quantity measurement) at an arbitrary time t, Φ ₀ is a luminous flux value immediately after the LED lighting apparatus is turned on (initial luminous flux value (initial light quantity measurement)), and ΔΦ is variation of light flux values leading to the steady state (photometric variation), tau _lm is the time constant, and [Phi _∞ is stationary value.

The fitting process based on [Equation 1] derived as described above is performed on the light flux value Φ (t) by the least square method, and includes the initial light flux value Φ ₀ , the light flux value variation ΔΦ, and the time constant τ _lm . A light flux value fluctuation characteristic parameter (light measurement quantity fluctuation characteristic parameter) is calculated. Calculating a steady-state value [Phi _∞ based on further [Equation 4].

  Next, using the calculated luminous flux value variation characteristic parameter, the stability when measuring the luminous flux is evaluated.

Variation of the light flux value [Phi based on the steady-state value [Phi _∞ (t) to evaluate the (stability), steady-state value [Phi _∞ and Hikaritabachi [Phi (t) and the light beam output stability of comparison (photometric output stability ) E (t) is calculated. The luminous flux output stability e (t) is calculated based on [Equation 2] shown below. As the light beam output stability e (t) is small close to the steady-state value [Phi _∞, stability evaluation is increased.

[Formula 2]

A contribution rate R ² (t) to the fitting of the luminous flux value variation characteristic parameter is calculated from the luminous flux value and the luminous flux value variation characteristic parameter. The contribution rate R ² (t) is calculated based on [Equation 6] shown below.

[Formula 6]

  By using the luminous flux value variation characteristic parameter, the measurement interval (5 minutes) of the lighting fixture in accordance with the JIS standard (JIS C 8105-5) is optimized according to the LED lighting fixture.

From the time constant τ _lm , a measurement interval Δt for measuring the luminous flux at an appropriate interval for each LED lighting fixture is calculated. The measurement interval Δt is calculated based on [Equation 3] shown below.

[Formula 3]

  The measurement interval Δt is derived from the following consideration.

  Based on the JIS standard (JIS C 8105-5), q (t) and p (t) are defined as q (t) for the rate of change from the value before Δt seconds and p (t) for the rate of change from the steady value. ) Is expressed by [Expression 7] and [Expression 8] shown below.

[Formula 7]

[Formula 8]

The allowable variation rate of q (t) is e (0.01 = 1% according to JIS standard (JIS C 8105-5)), and the time at which p (t) and q (t) intersect is represented by t ₀ , q (t ) = E is set to t ₁ , p (t) and q (t) intersect at one point, and at t ₁ , p (t) ≧ q (t) (that is, evaluation of q (t) At time (t = t ₁ ), a value of Δt that satisfies a condition (see FIG. 3) that q (t) is equal to or less than p (t) is obtained.

  This condition is [Equation 9] shown below.

[Formula 9]

  From the above, at e << 1, the measurement interval Δt is [Expression 3] (see FIG. 4). The value of the measurement interval Δt is not less than 10 minutes from the time constant exceeding 900 sec (see FIG. 5).

  The luminous flux measurement stability evaluation method described above can be realized by a hardware configuration, a DSP (Digital Signal Processor), an MPU (Micro Processing Unit), and software. For example, when realized by software, a program stored in RAM or ROM is operated by a luminous flux measurement stability evaluation apparatus (photometric light measurement stability evaluation apparatus) 10 provided with a CPU, MPU, RAM, ROM, or the like. Can be realized.

  Therefore, a program for causing the luminous flux measurement stability evaluation apparatus 10 to operate so as to perform each processing function according to the luminous flux measurement stability evaluation method is recorded on a recording medium such as a CD-ROM and read into the luminous flux measurement stability evaluation apparatus 10. Can be realized. As a recording medium for recording the program, for example, a flexible disk, an optical disk or the like can be used in addition to the CD-ROM. It can also be realized by downloading a program to the luminous flux measurement stability evaluation apparatus 10 via a network.

  As shown in FIG. 6, the luminous flux measurement stability evaluation device 10 may be incorporated into a known luminous flux measurement system 1 configured by a spherical luminous meter such as an integrating sphere and a measurement device. The luminous flux measurement stability evaluation apparatus 10 includes an input unit, a luminous flux value fluctuation characteristic parameter calculation unit, a contribution rate calculation unit, a stability calculation unit, and a display unit. Hereinafter, the flow of processing by the luminous flux measurement stability evaluation apparatus 10 will be described with reference to FIG.

In step S1, the values of the fitting contribution rate R ² and the allowable stability e are input and set in the input unit. In step S2, the luminous flux of the LED luminaire is measured with a spherical luminous meter, and a luminous flux value Φ (t) is obtained as time-series luminous flux output data. The data to be handled may be a relative value.

In step S3, the light flux value variation characteristic parameter calculation unit performs a fitting process based on [Equation 1] on the light flux value Φ (t) by the least square method, so that the light flux value Φ ₀ , the light flux value change amount ΔΦ, and A luminous flux value fluctuation characteristic parameter including the time constant τ _lm is calculated. Steady value [Phi _∞ is calculated on the basis of further [Equation 4].

In step S4, the contribution rate calculation unit calculates the contribution rate R ² (t) based on [Expression 6] from the light flux value Φ (t) and the light flux value variation characteristic parameter (see FIG. 8). The stability calculation unit, the constant value [Phi _∞ and Hikaritabachi [Phi (t) light flux values obtained by comparing the output stability e (t) is calculated based on [Equation 2].

  In step S4, the display unit displays the obtained luminous flux output data and luminous flux value variation characteristic parameters in a graph.

In step S5, the contribution rate R ² (t) calculated by the contribution rate calculation unit is smaller than the fitting contribution rate R ² , and the luminous flux value output stability e (t) calculated by the stability calculation unit is acceptable. It is determined whether or not the degree of stability is smaller than e. If the determination result is true (True), it is evaluated that the light flux value Φ (t) has been measured in a stable state, and the process proceeds to step S6. If false (False), the process returns to step S2 and next. The luminous flux value Φ (t) is processed at the time.

  In step S6, the light flux value Φ (t) in the stable state is displayed on the display unit.

In the measurement interval calculation unit, the measurement interval Δt at which the luminous flux is measured in a stable state is calculated from the time constant τ _lm based on [Equation 3].

  Next, the effect of this embodiment will be described.

As described above, according to the present embodiment, the fitting process based on [Equation 1] is performed on the light flux value Φ (t) by the least square method, and the light flux value Φ ₀ , the change amount ΔΦ of the light flux value, and the time constant. A luminous flux value fluctuation characteristic parameter including τ _lm is calculated. With this configuration, the characteristic values of the LED lighting apparatus is represented by a light flux value variation characteristic parameters, such as time to reach a steady-state value [Phi _∞ and constant value of the luminous flux becomes apparent. Therefore, the light source performance of the LED lighting fixture is clarified, and the stability when measuring the luminous flux of the LED lighting fixture can be accurately evaluated.

  Further, the convergence value can be predicted at an early stage by calculating the luminous flux value variation characteristic parameter by sequentially performing the fitting process using [Equation 1].

According to this embodiment, calculates a steady-state value [Phi _∞ based on [Expression 4], the constant value based on [Equation 2] [Phi _∞ and Hikaritabachi [Phi (t) and comparing the light flux output stability e ( t) is calculated. With this configuration, steady-state value [Phi _∞ is compared with light flux value as an evaluation criterion for stability, it is intended that the light flux values are measured in a stable state, is evaluated from the light value output stability e (t) . Therefore, it is possible to more accurately evaluate the stability when measuring the luminous flux of the LED lighting apparatus.

According to the present embodiment, the contribution rate R ² (t) to the fitting of the luminous flux value variation characteristic parameter is calculated from the luminous flux value and the luminous flux value variation characteristic parameter based on [Equation 6]. Therefore, it is possible to accurately evaluate the stability when measuring the luminous flux of the LED lighting apparatus with high reliability.

According to this embodiment, based on [Formula 3] from the time constant τ _lm , the measurement interval Δt for measuring the luminous flux at an appropriate interval for each LED lighting fixture is calculated. Therefore, regarding the measurement interval Δt when the luminous flux is measured, an appropriate value corresponding to each LED lighting fixture can be calculated.

  Next, examples of the present invention will be described.

<First Example>
In FIG. 9, the total luminous flux values displayed on the product are 210 ml (bulb color), 280 ml (lunch white), 310 ml (bulb color), and 420 ml (lunch white), respectively. The luminous flux value fluctuation characteristic parameters (initial luminous flux value Φ ₀ , luminous flux change amount ΔΦ, time constant τ _lm ) and contribution rate R ² were calculated (t = 3000 sec). The contribution rate R ² was 99% or more, and the validity of [Formula 1] could be confirmed.

<Second Example>
In FIG. 10, the total luminous flux values displayed on the product are 380 ml (bulb color), 500 ml (lunch white), 500 ml (bulb color), 650 ml (lunch white), 650 ml (bulb color), and 850 ml (lunch white), respectively. The total luminous flux of the LED lighting fixture was measured, and the luminous flux value fluctuation characteristic parameter and the contribution rate R ² were calculated (t = 3000 sec).

<Third embodiment>
In FIG. 11, the total luminous flux values of LED lighting fixtures whose total luminous flux values displayed on the products are 325 ml (bulb color), 450 ml (bulb color), and 650 ml (bulb color), respectively, are measured. The contribution rate R ² was calculated (325 ml: t = 5866 sec, 450 ml: t = 4523 sec, 650 ml: t = 4266 sec). The third embodiment is current controlled, and its contribution rate is slightly lower than that of the fourth embodiment that is not current controlled.

<Fourth embodiment>
In FIG. 12, the total luminous flux of LED lighting fixtures having total luminous flux values displayed on the product of 820 ml (bulb color), 1000 ml (bulb color), and 1200 ml (bulb color), respectively, is measured. The contribution rate R ² was calculated (820 ml: 1223 sec, 1000 ml: 1487 sec, 1200 ml: 1319 sec).

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment. The present invention can be modified in various ways without departing from the scope of the claims.

1 Luminous flux measurement system 10 Luminous flux measurement stability evaluation device (photometric measurement stability evaluation device)

Claims (9)

From the photometric quantity including any one of the luminous flux value, luminous intensity, illuminance, and luminance of the luminaire, the photometric quantity variation characteristic parameter including the initial photometric quantity Φ ₀ , the photometric quantity change ΔΦ, and the time constant τ _lm is set to [ Calculated based on Equation 1]
Evaluating that the photometric quantity is measured in a stable state based on the photometric quantity variation characteristic parameter,
A method for evaluating the stability of photometric measurement of a lighting fixture.
[Formula 1]

Calculate a steady-state value Φ _∞ of the photometric quantity of the lighting fixture,
Said steady value [Phi _∞ and the photometric and photometric output stability of comparison e (t), is calculated based on [Equation 2],
The method for evaluating the stability of photometric light measurement according to claim 1.
[Formula 2]

Calculating a contribution ratio to the fitting of the photometric quantity variation characteristic parameter;
The method for evaluating the stability of photometric light measurement according to claim 1 or claim 2, wherein: From the time constant τ _lm , a measurement interval Δt for measuring the photometric quantity of the lighting fixture in a stable state is calculated based on [Equation 3].
The method of evaluating the stability of photometric measurement according to any one of claims 1 to 3.
[Formula 3]

Based on [Equation 1], a photometric light quantity variation characteristic parameter including an initial photometric light quantity Φ ₀ , a photometric light quantity change amount ΔΦ, and a time constant τ _lm is calculated from the photometric quantity of the lighting equipment. a photometric variation characteristic parameter calculator steady value [Phi _∞ is calculated, and
The steady-state value [Phi _∞ and the photometric and photometric output stability of comparison e (t) is, the stability calculation unit calculated based on [Equation 2],
Equipped with,
A photometric measurement stability evaluation apparatus characterized by the above.
[Formula 1]

[Formula 2]

A contribution rate calculation unit for calculating a contribution rate to the fitting of the photometric quantity variation characteristic parameter;
The photometric measurement stability evaluation apparatus according to claim 5. A measurement interval calculation unit for calculating a measurement interval Δt at which the photometric quantity is measured in a stable state from the time constant τ _lm is calculated based on [Equation 3];
The apparatus for evaluating the stability of photometric light quantity measurement according to claim 5 or 6, characterized in that:
[Formula 3]

A procedure for calculating a photometric quantity variation characteristic parameter including an initial photometric quantity Φ ₀ , a photometric quantity change ΔΦ, and a time constant τ _lm based on [Equation 1] from the photometric quantity of the lighting fixture;
A procedure for calculating a steady-state value Φ _∞ of the photometric quantity of the lighting fixture;
A step of calculating, based the steady value [Phi _∞ and the photometric and photometric output stability of comparison e (t) in Expression 2,
To run on a computer,
A photometric measurement stability evaluation program characterized by that.
[Formula 1]

[Formula 2]

The photometric measurement stability evaluation program according to claim 8 is recorded,
A computer-readable recording medium characterized by the above.

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