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WO2017037871A1 - Dispositif de mesure - Google Patents

Dispositif de mesure Download PDF

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Publication number
WO2017037871A1
WO2017037871A1 PCT/JP2015/074859 JP2015074859W WO2017037871A1 WO 2017037871 A1 WO2017037871 A1 WO 2017037871A1 JP 2015074859 W JP2015074859 W JP 2015074859W WO 2017037871 A1 WO2017037871 A1 WO 2017037871A1
Authority
WO
WIPO (PCT)
Prior art keywords
wavelength
laser light
transmittance
sensitivity
wavelength dependency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2015/074859
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English (en)
Japanese (ja)
Inventor
育也 菊池
敦也 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikkiso Co Ltd
Pioneer Corp
Original Assignee
Nikkiso Co Ltd
Pioneer Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nikkiso Co Ltd, Pioneer Corp filed Critical Nikkiso Co Ltd
Priority to PCT/JP2015/074859 priority Critical patent/WO2017037871A1/fr
Publication of WO2017037871A1 publication Critical patent/WO2017037871A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity

Definitions

  • the present invention relates to a technical field of a measuring apparatus that acquires information on information to be measured using laser light.
  • Patent Document 1 discloses an apparatus that irradiates blood with light and measures blood concentration from the amount of transmitted light.
  • An object of the present invention is to provide a measuring apparatus that can suitably realize measurement using laser light.
  • a measuring apparatus for solving the above problems includes a laser light source that emits laser light toward a measurement target having a transmittance wavelength dependency in which the transmittance changes according to the wavelength of the laser light, and the wavelength of the laser light.
  • the detection wavelength has a sensitivity wavelength dependency that changes in response, and includes a detection unit that detects the laser light transmitted or reflected by the measurement target, and the sensitivity wavelength dependency of the detection unit is In the wavelength range of the laser beam, the product of the sensitivity wavelength dependency of the detection unit and the transmittance wavelength dependency of the measurement target is smaller than the transmittance wavelength dependency of the measurement target. Is set.
  • the measurement apparatus includes a laser light source that emits laser light toward a measurement target having a transmittance wavelength dependency in which the transmittance changes according to the wavelength of the laser light, and the wavelength of the laser light.
  • a detection unit that detects the laser beam transmitted or reflected on the object to be measured, and the sensitivity wavelength dependency of the detection unit In the light wavelength range, the product of the sensitivity wavelength dependency of the detection unit and the transmittance wavelength dependency of the measurement target is set to be smaller than the transmittance wavelength dependency of the measurement target. ing.
  • laser light is emitted from the laser light source toward the measurement target.
  • the laser light source include a Fabry-Perot (FP) laser light source and a distributed feedback (DFB) laser light source, but the type of the light source is not particularly limited in this embodiment.
  • the measurement target include blood and the like, but are not limited to those related to a living body, and may be gas, liquid, or solid.
  • the laser light emitted from the laser light source is detected or detected by the detection unit after being transmitted or reflected by the measurement target.
  • the detection unit is configured as a photodiode, for example, and configured to be able to detect the intensity of the laser beam.
  • the intensity of the laser light transmitted or reflected by the measurement target changes in accordance with the transmittance or reflectance of the measurement target. Therefore, if the intensity of the laser beam detected by the detection unit is used, information (for example, concentration) about the measurement target can be acquired.
  • the detection unit described above has a sensitivity wavelength dependency in which the detection sensitivity changes according to the wavelength of the laser light.
  • the sensitivity wavelength dependency of the detection unit is the product of the sensitivity wavelength dependency of the detection unit and the transmittance wavelength dependency of the measurement target in the wavelength range of the laser light. It is set to be smaller. That is, the detection unit has a sensitivity wavelength dependency that at least partially cancels the transmittance wavelength dependency of the measurement target.
  • the “transmission wavelength dependency” is a value indicating how much the ratio of the intensity of the laser beam incident on the object to be measured and the intensity of the emitted laser beam changes depending on the wavelength. This is a concept that also includes reflectance wavelength dependency in which the reflectance changes in accordance with the wavelength of.
  • the product of the sensitivity wavelength dependency and the transmittance wavelength dependency of the object to be measured is a value indicating the wavelength dependency obtained by combining the sensitivity wavelength dependency and the transmittance wavelength dependency. It shows how much the intensity of the emitted laser light changes depending on the wavelength in the measurement target and the detection unit. For this reason, the “product” here is not limited to a value obtained by simple multiplication.
  • the object to be measured has transmittance wavelength dependency
  • the intensity of the laser light emitted from the object to be measured changes.
  • the detection unit does not have sensitivity wavelength dependency, the intensity of the laser beam detected by the detection unit varies depending on the wavelength. That is, even for the same object to be measured, different measurement results are obtained due to the transmittance wavelength dependency of the object to be measured.
  • the transmittance wavelength dependency of the measurement target is reduced due to the sensitivity wavelength dependency of the detection unit.
  • the change in the intensity of the detection light due to the difference in the wavelength of the laser light can be reduced. Therefore, the deviation of the measurement result due to the difference in the wavelength of the laser beam can be reduced. Therefore, accurate measurement can be performed even when the wavelength of the laser light source fluctuates or even when the laser light source has individual differences.
  • the product of the sensitivity wavelength dependency and the transmittance wavelength dependency of the object to be measured is as small as possible (that is, a value close to a state having no wavelength dependency). ).
  • the measuring apparatus According to the measuring apparatus according to the present embodiment, it is possible to accurately measure even when the measurement target has transmittance wavelength dependency.
  • the laser light source is a Fabry-Perot laser light source.
  • Fabry-Perot laser light sources are considered to be inexpensive and highly reliable compared to different types of laser light sources such as distributed feedback laser light sources. For this reason, if a Fabry-Perot type laser light source is used, cost reduction and reliability improvement can be realized.
  • the Fabry-Perot type laser light source varies the wavelength of the laser beam to be irradiated due to temperature characteristics.
  • the transmittance wavelength dependency of the measurement target is at least partially offset by the sensitivity wavelength dependency of the detection unit. Therefore, even if the wavelength fluctuates, the deviation of the measurement result can be effectively suppressed.
  • the laser light source emits laser light in a wavelength range in which the transmittance wavelength dependency of the measurement target is linear.
  • the transmittance wavelength dependence of the measurement target is not linear when viewed in the entire wavelength range, it is linear when viewed only in the wavelength range of the laser light source. Can be considered. Therefore, it is possible to effectively cancel out the transmittance wavelength dependency of the object to be measured by using the detection unit whose sensitivity wavelength dependency is linear.
  • the detection unit whose sensitivity wavelength dependency is linear.
  • a detection unit that increases the intensity of the laser beam to be detected may be used.
  • the transmittance wavelength dependency of the measurement target can be regarded as linear, it is easy to select an appropriate detection unit, and the influence of the transmittance wavelength dependency of the measurement target is suitably reduced. be able to.
  • the laser light source emits laser light in a wavelength range that does not include a wavelength at which the detection sensitivity of the detection unit is maximized.
  • the detection sensitivity of the detection unit typically increases linearly until the detection sensitivity reaches a maximum according to the wavelength, and then decreases linearly. That is, the detection sensitivity increases or decreases linearly except for the wavelength vicinity where the detection sensitivity is maximum. Therefore, if the wavelength range of the laser light does not include a wavelength that maximizes the detection sensitivity of the detection unit, it can be considered that the detection sensitivity of the detection unit increases or decreases linearly. Therefore, it is possible to suitably cancel out the transmittance wavelength dependency of the measurement target using the sensitivity wavelength dependency of the detection unit.
  • the optical device further includes an optical element that is disposed on the optical path of the laser light and has the transmittance wavelength dependency, and the transmittance wavelength dependency of the optical element is In the wavelength range of the laser beam, the product of the sensitivity wavelength dependency of the detection unit and the transmittance wavelength dependency of the optical element and the measurement target is the sensitivity wavelength dependency of the detection unit and the It is set to be smaller than the product of the transmittance wavelength dependency of the object to be measured.
  • the optical element is arranged on the optical path of the laser beam. For this reason, the laser light emitted from the laser light source enters the detection unit via the measurement target and the optical element.
  • the optical element may be disposed between the laser light source and the measurement target, or may be disposed between the measurement target and the detection unit.
  • a plurality of optical elements may be arranged on the optical path of the laser beam.
  • the optical element described above has a transmittance wavelength dependency in which the transmittance changes in accordance with the wavelength of the laser light, similarly to the object to be measured.
  • the transmittance wavelength dependency of the optical element is the product of the sensitivity wavelength dependency of the detection unit and the transmittance wavelength dependency of the optical element and the object to be measured in the wavelength range of the laser light. It is set to be smaller than the product of the sensitivity wavelength dependency and the transmittance wavelength dependency of the object to be measured. That is, the optical element has a transmittance wavelength dependency that at least partially cancels the wavelength dependency of the object to be measured and the detection unit.
  • the influence of the wavelength dependency of the optical element on the wavelength of the optical element cannot be reduced sufficiently by the sensitivity wavelength dependency of the detector alone.
  • the influence of wavelength dependency on the entire apparatus can be further reduced. Therefore, It is possible to more effectively suppress the deviation in the measurement result due to the difference in the wavelength of the laser light.
  • FIG. 1 is a schematic configuration diagram illustrating the overall configuration of the measurement apparatus according to the embodiment.
  • the measuring apparatus includes a laser light source 110 and a detector 120.
  • the laser light source 110 is configured as a Fabry-Perot laser light source, for example, and irradiates blood 500 flowing through the tube 510 with laser light in a predetermined wavelength range. Blood 500 is a specific example of “object to be measured”.
  • the detector 120 is configured as a photodiode, for example, and detects laser light emitted from the laser light source 110 and transmitted through the optical element 200 and the blood 500.
  • the detector 120 is configured to output a detection signal corresponding to the intensity of the detected laser beam, for example, to an analysis device (not shown).
  • the detector 120 has a sensitivity wavelength dependency in which the detection sensitivity changes according to the wavelength of the incident laser light.
  • the detector 120 is a specific example of “detection unit”.
  • FIG. 2 is a graph showing the wavelength dependency of the absorbance of blood
  • FIG. 3 is a graph (part 1) showing the sensitivity wavelength dependency of the detector
  • FIG. 4 is a graph showing the wavelength dependency of the water-soluble processing oil
  • FIG. 5 is a graph (No. 2) showing the sensitivity wavelength dependency of the detector.
  • the absorbance (transmittance) of blood 500 varies according to the wavelength of the incident laser light.
  • HbO 2 and Hb the absorbance of HbO 2 and Hb, it will be described here HbO 2, measured as blood concentration in the example dialysis.
  • the absorbance of HbO 2 varies while repeatedly increasing and decreasing in the wavelength range of 650 nm to 1200 nm. Therefore, when the wavelength of the laser light varies, the intensity of the laser light emitted from the blood 500 changes. Further, when there is a difference in the wavelength of the laser light emitted due to individual differences in the laser light source 110, even when the same type of laser light source 110 is used, the laser light emitted from the blood 500 due to the difference in wavelength. Changes in the strength. Therefore, if the detector 120 does not have sensitivity wavelength dependency, the intensity of the detected laser light varies according to the wavelength. That is, even if the same object to be measured is used, different measurement results are obtained due to the different wavelengths of the laser light.
  • the present embodiment aims to reduce the above-described transmittance wavelength dependency by making the detector 120 have sensitivity wavelength dependency.
  • the transmittance wavelength dependency of blood 500 is at least partially offset by the sensitivity wavelength dependency of detector 120.
  • the transmittance wavelength dependency of HbO 2 is preferably linear with respect to the wavelength. Therefore, in this embodiment, the wavelength range of the laser light emitted by the laser light source 110 is set to a specific wavelength range so that the transmittance wavelength dependency of HbO 2 can be regarded as substantially linear.
  • the laser light source 110 according to the present embodiment irradiates laser light having a wavelength range of 750 nm to 900 nm in which the absorbance of HbO 2 increases linearly with an increase in wavelength.
  • a detector 120 whose sensitivity increases as the wavelength becomes longer may be used. In this way, when the wavelength of the laser beam is increased, the intensity of the laser beam that passes through the blood 500 is decreased, whereas the detection sensitivity of the detector 120 is increased (that is, the detected light amount is increased). ). Therefore, fluctuations in the intensity of the laser light according to the wavelength can be reduced, and deviations in measurement results can be suppressed.
  • the object to be measured is not limited to blood 500, and may be, for example, a water-soluble processing oil used in industrial applications.
  • the wavelength range of the laser light emitted by the laser light source 110 is 630 nm to 680 nm
  • the transmittance wavelength dependency of the water-soluble processing oil can be regarded as linear.
  • the laser light source 110 that can irradiate a laser beam in the wavelength range of 630 nm to 680 nm include a laser light source used for reading a DVD. For this reason, when utilizing the said wavelength range, the cheap component generally spread can be utilized and cost reduction can be aimed at.
  • a detector 120 whose detection sensitivity decreases as the wavelength becomes longer may be used.
  • the intensity of the laser beam that passes through the water-soluble processing oil increases, whereas the detection sensitivity of the detector 120 decreases (that is, the detected light amount decreases). Smaller). Therefore, fluctuations in the intensity of the laser light according to the wavelength can be reduced, and deviations in measurement results can be suppressed.
  • FIG. 6 is a graph showing the wavelength dependence of the normalized transmitted light amount.
  • FIG. 7 is a graph showing the sensitivity wavelength dependency of the detector together with the wavelength range of the laser beam.
  • FIG. 8 is a graph showing the combined transmitted light rate and the sensitivity wavelength dependency of the detector, and
  • FIG. 9 is a graph showing the wavelength dependency of the normalized detected light amount for each detector.
  • the wavelength range of the laser light source 110 is 850 ⁇ 15 nm
  • the wavelength with the maximum detection sensitivity is included in the wavelength range of 850 ⁇ 15 nm of the laser light source 110.
  • the wavelength range of the laser light source 110 that is 850 ⁇ 15 nm does not include the wavelength that maximizes the detection sensitivity. If only the detection sensitivity is taken into consideration, the detector A having a high detection sensitivity in the wavelength range of the laser light source 110 may be used. In order to reduce the transmittance wavelength dependency of the measurement target, the sensitivity Trends in wavelength dependence should also be considered.
  • the detector A has a wavelength dependence on the sensitivity wavelength because the wavelength range of the laser light source 110 includes the wavelength with the maximum detection sensitivity.
  • the detector B does not include the wavelength at which the detection sensitivity is maximized in the wavelength range of the laser light source 110, the sensitivity wavelength dependency is linear. Further, the sensitivity wavelength dependency of the detector B has a tendency that is almost opposite to the transmittance wavelength dependency of the measurement target.
  • the wavelength dependency of the transmittance of the linear object to be measured cannot be offset appropriately because the sensitivity wavelength dependency is piled up.
  • the amount of light detected when the detector A is used varies depending on the wavelength of the laser light. Specifically, when the detector A is used, the detected light quantity decreases as the wavelength of the laser light increases.
  • the detector B since the sensitivity wavelength dependency is linear, the wavelength dependency of the transmittance of the measurement target can be offset appropriately. As a result, the amount of light detected when the detector B is used hardly changes even if the wavelength of the laser light changes.
  • the detected light amount is standardized with the maximum value being “1”.
  • the wavelength range of the laser light source 110 includes the wavelength with the maximum detection sensitivity.
  • the one that is not (ie detector B) should be used.
  • FIGS. 10 to 13 are schematic configuration diagrams showing the overall configuration of the measuring apparatus according to the first to fourth modifications, respectively.
  • an optical element 200 is disposed between the laser light source 110 and the blood 500.
  • the optical element 200 has a transmittance wavelength dependency in which the transmittance changes according to the wavelength of the laser light.
  • the optical element 200 is configured, for example, as an optical filter using a dielectric multilayer film, or a resin or the like mixed with a specific wavelength light absorbing material such as an infrared blocking film and an ultraviolet blocking film.
  • the optical element 200 is disposed between the blood 500 and the detector 120. For this reason, the laser beam after passing through the blood 500 is incident on the optical element 200 according to the second modification.
  • the effect obtained by the measuring apparatus according to the modified example described later does not change. That is, as long as the optical element 200 is disposed on the optical path between the laser light source 110 and the detector 120, the position of the optical element 200 is not particularly limited.
  • a collimator lens 150 for making laser light parallel light is disposed between the laser light source 110 and the blood 500.
  • the collimator lens 150 is coated to give wavelength dependency. Therefore, in the second modification, the collimator lens 150 functions as the optical element 200. In this manner, an existing member can be made to function as the optical element 200 without providing the optical element 200 separately.
  • a mold member 125 for protecting the detector 120 is provided on the surface of the detector 120 (more specifically, the surface on which the laser light is incident). ing.
  • the mold member 125 is mixed with a material that absorbs laser light having a specific wavelength (for example, glass powder doped with an organic dye substance or a wavelength selective substance (CdS or the like)). Therefore, in the fourth modification, the mold member 125 of the detector 120 functions as the optical element 200.
  • the collimator lens 150 may function as the optical element 200 in addition to the mold member 125.
  • a plurality of optical elements 200 may be arranged on the optical path of the laser light.
  • FIG. 14 is a graph showing the wavelength dependence of the object to be measured, the detector, and the optical element.
  • FIG. 15 is a graph showing the wavelength dependence of the standardized detected light amount divided by the presence or absence of an optical element.
  • the detector B is used among the detectors described with reference to FIGS.
  • the transmission wavelength dependency of the measurement target may not be sufficiently reduced only by the detection sensitivity of the detector 120.
  • the sensitivity wavelength dependency of the detector 120 may be changed to a larger one, but it can be dealt with by using the optical element 200 in combination.
  • the object to be measured has a transmittance wavelength dependency in which the transmittance decreases relatively rapidly as the wavelength increases.
  • the detector B has a sensitivity wavelength dependency in which the detection sensitivity increases relatively gradually as the wavelength increases.
  • the optical element 200 also has a sensitivity wavelength dependency that the detection sensitivity increases as the wavelength increases.
  • the detected light amount changes according to the wavelength because the sensitivity wavelength dependency of the detector B is small. Specifically, the detected light amount decreases as the wavelength increases.
  • the optical element 200 when the optical element 200 is added, the transmittance wavelength dependency of the object to be measured can be canceled by both the detector B and the optical element 200, so that the detected light amount hardly changes even if the wavelength varies. .
  • by adding the optical element 200 it is possible to more suitably reduce the transmittance wavelength dependency of the measurement target.
  • the measuring apparatus According to the measuring apparatus according to the present embodiment, it is possible to reduce the transmittance wavelength dependency of the measurement target, and therefore it is possible to realize a suitable measurement independent of the wavelength of the laser beam. .

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Le dispositif de mesure de l'invention est équipé : d'une source de lumière laser (110) qui génère une lumière laser vers un objet à mesurer (500) de transmittance dépendante à la longueur d'onde dont la transmittance varie selon la longueur d'onde de la lumière laser ; et d'une partie détection (120) de sensibilité dépendante à la longueur d'onde dont la sensibilité de détection varie selon la longueur d'onde de la lumière laser, et qui détecte la lumière laser transmise ou réfléchie au niveau de l'objet à mesurer. La dépendance à la longueur d'onde de la sensibilité de la partie détection, est établie de manière à ce que le produit de la dépendance à la longueur d'onde de la sensibilité et de la dépendance à la longueur d'onde de la transmittance de l'objet à mesurer dans une plage de longueur d'onde de la lumière laser, est inférieur à la dépendance à la longueur d'onde de la transmittance de l'objet à mesurer. Ainsi, il est possible d'empêcher un décalage de résultats de mesure dû à une fluctuation de longueur d'onde de la lumière laser.
PCT/JP2015/074859 2015-09-01 2015-09-01 Dispositif de mesure Ceased WO2017037871A1 (fr)

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PCT/JP2015/074859 WO2017037871A1 (fr) 2015-09-01 2015-09-01 Dispositif de mesure

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63275327A (ja) * 1987-05-08 1988-11-14 Hamamatsu Photonics Kk 診断装置
JP2008531212A (ja) * 2005-03-01 2008-08-14 マシモ・ラボラトリーズ・インコーポレーテッド 多波長センサ等化
WO2008114401A1 (fr) * 2007-03-20 2008-09-25 Pioneer Corporation Instrument de mesure de bioinformations
WO2009093453A1 (fr) * 2008-01-25 2009-07-30 Panasonic Corporation Dispositif d'analyse et procédé d'analyse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63275327A (ja) * 1987-05-08 1988-11-14 Hamamatsu Photonics Kk 診断装置
JP2008531212A (ja) * 2005-03-01 2008-08-14 マシモ・ラボラトリーズ・インコーポレーテッド 多波長センサ等化
WO2008114401A1 (fr) * 2007-03-20 2008-09-25 Pioneer Corporation Instrument de mesure de bioinformations
WO2009093453A1 (fr) * 2008-01-25 2009-07-30 Panasonic Corporation Dispositif d'analyse et procédé d'analyse

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