JP2010021824A - Microwave visible sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suggest a microwave visible sensor capable of visually detecting the electromagnetic field distribution and the standing wave position of microwaves in a waveguide. <P>SOLUTION: The microwave visible sensor 50 is constituted by: providing a plurality of small holes 36 along a tube axis on the side 34E of an applicator 34 of rectangular waveguide structure; fixing a substrate 38 with a plurality of detection members 37 having antennas 39 suited to each interval of the small holes 36 to the side 34E of the applicator 34; and providing each detection member 37 with a detection diode 40 which is conducted by electromotive force to be generated in the antennas 39, and an LED 41 which is lit by conduction of the detection diode 40. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a microwave visible sensor that can visually detect a field intensity distribution of a microwave propagating in a waveguide, a generation position of a microwave standing wave, and the like.

2. Description of the Related Art A microwave apparatus that includes a rectangular waveguide applicator, irradiates a workpiece with microwaves in the applicator, and heats the workpiece is widely known.
FIG. 8 is a simplified diagram showing a microwave heating test apparatus shown as a conventional example, and FIG. 9 is a partially enlarged sectional view of the test apparatus.
In this test apparatus, a magnetron 10 is mounted on a high-frequency coupler 11, and microwave power output from the magnetron 10 (in this application, simply referred to as “microwave”) is coupled to the high-frequency coupler 11 and guided. Propagates the tube circuit.

That is, the microwave reaches the high frequency coupler 11, the power monitor 12, the stub tuner 13, the applicator 14, and the plunger movable portion 15a of the movable plunger 15, and is reflected by the plunger movable portion 15a.
Specifically, the microwaves reflected by the applicator 14 and the plunger movable portion 15 a are directed toward the magnetron 10.
Therefore, when the stub tuner 13 is adjusted while monitoring the reflected power value of the power monitor 12, and the stub tuner 13 creates and cancels the wave having the opposite phase to the reflected wave, the reflected power value of the power monitor 12 becomes zero.

The applicator 14 formed of a rectangular waveguide is provided with an insertion port 14a for the test tube 16 on the upper surface (magnetic field surface H). The elongated test tube 16 containing the sample 17 is inserted into the insertion port 14a. The sample 17 is inserted in the applicator 14 and disposed in the applicator 14.
The test tube 16 is provided with an adjusting member 18 for adjusting the insertion length.

The plunger movable portion 15 adjusts the plunger movable portion 15 a to move and adjust the position of the standing wave of the microwave generated in the applicator 14.
Specifically, a large standing wave is generated in the applicator 14 due to interference between the traveling wave of the microwave output from the magnetron 10 and the reflected wave reflected by the plunger movable portion 15a. It adjusts so that the big electric field by a standing wave may act on the sample 17. FIG.

In the above test apparatus, the sample 17 is microwave-heated and a test such as the presence or absence of chemical reaction or chemical change of the sample 17 is performed. However, in the case of this test apparatus, the position where the standing wave is generated is unknown. There is a problem of not saying.
That is, the plunger movable portion 15a is adjusted to match the standing wave with the sample 17. However, since the position where the standing wave is generated is not known, the plunger movable portion 15a is roughly adjusted based on experience. It is not accurately known whether or not the above occurs at the position of the sample 17.

On the other hand, a detection device for detecting a microwave electromagnetic field distribution has already been proposed by the present applicant.
As shown in FIG. 10, this detection apparatus has a configuration in which a large number of unitized detection units 21 </ b> A and 21 </ b> B are arranged on the surface of the substrate 22.
The substrate 22 is a printed substrate having a low dielectric so that the substrate itself is not heated by microwaves.

The detectors 21A and 21B are shown in detail in FIG.
That is, the detection unit 21A has a configuration in which the detection diode 24 and the LED 25 are connected in series by a U-shaped long antenna 23a and a linear antenna 23b. (See Figure 12)
The detection diode 24 is a detection diode that is turned on when a high-frequency voltage with a microwave frequency of about f = 2450 MHz is generated in the antenna, and the LED 25 is a green light-emitting diode.

The detection unit 21B has a configuration in which the detection diode 26 and the LED 27 are connected in series by two linear (short-diameter) antennas 28a and 28b. (See Figure 13)
The detection diode 26 is the same as the detection diode 24 described above, but the LED 27 is a red light emitting diode.

In the detection units 21A and 21B, the detection diodes 24 and 26 and the LEDs 25 and 27 are mounted on the surface of the substrate 22 on which the antennas 23a, 23b, 28a, and 28b are printed and soldered.
The detection units 21A and 21B configured as described above have higher detection sensitivity as the antenna is longer, and the detection sensitivity of the detection unit 21A is higher than that of the detection unit 21B.

When the above-described detection device irradiates the myco waves, the microwaves are received by the antennas of the detection units 21A and 21B, but the detection units 21A and 21B both perform detection operations in a portion where the electromagnetic field of the microwave is strong. .
That is, the detection diodes 24 and 26 of the detection units 21A and 21B are both conducted by the electromotive force induced in each antenna by the microwave magnetic field, and the green LED 25 and the red LED 27 emit light.

In a portion where the microwave electromagnetic field is weak, the detection unit 21B having a low detection sensitivity is in a non-detection state, so that only the detection unit 21A performs a detection operation and only the green LED 25 emits light.
In this way, it is possible to visually detect the strength and weakness portions of the microwaves in the portion where the green and red emission colors are large and the portion where the green emission color is large.

JP 2006-322869 A

The problem to be solved is that, as described above, the standing wave position of the microwave generated in the waveguide and the electromagnetic field distribution in the waveguide cannot be detected through vision. The electric field cannot be applied to the workpiece in the best form.
Therefore, the present invention proposes a microwave visible sensor that can visually detect a standing wave or an electromagnetic field distribution in a waveguide by applying the above-described detection device that detects a microwave electromagnetic field distribution. The purpose is to do.

  In order to achieve the above-described object, the present invention provides, as a first invention, an antenna that receives a microwave, a diode that detects the microwave received by the antenna, a light source that is powered and lit according to the detection of the diode, The detection member is provided, and the detection member is provided in the waveguide so that the antenna of the detection member is disposed corresponding to the small hole formed in the waveguide, and the light source of the detection member is turned on. We propose a microwave visible sensor that is characterized by visual confirmation and that detects microwaves in the waveguide.

  According to a second aspect of the present invention, an antenna that receives microwaves is disposed on the back surface of the substrate, and the surface of the substrate is connected to the antenna through a through hole, and the microwaves received by the antenna are detected. And a detection member formed by providing a light source that is powered and turned on according to the detection of the diode, and an antenna of the detection member is provided corresponding to a small hole formed in the waveguide In this way, the substrate of the detection member is fixed to the outer surface of the waveguide, the lighting of the light source of the detection member is visually confirmed, and the microwave existing in the waveguide is detected. A wave visible sensor is proposed.

  According to a third aspect of the present invention, an antenna that receives microwaves is disposed on the back surface of the substrate, and the surface of the substrate is connected to the antenna via a through hole, and the microwaves received by the antenna are detected. And a plurality of detection members formed by arranging a light source that is powered and turned on according to detection of the diodes along the longitudinal direction of the long substrate, and each of the detection members described above is arranged. The substrate is fixed to the outer surface of the waveguide so that the antenna is disposed in a plurality of small holes formed along the tube axis direction of the waveguide, and the lighting state of the light source of each detection member is visually confirmed. Then, a microwave visible sensor characterized in that the microwave electric field intensity distribution or the microwave standing wave position in the waveguide is detected is proposed.

According to the visible sensors of the first and second inventions, the antenna of the detection member receives microwaves through the small hole of the waveguide, and an electromotive force is generated in the antenna due to the microwave magnetic field.
Therefore, when an electromotive force exceeding a predetermined voltage is generated in the antenna, the detection diode is turned on and the light source is turned on.
Specifically, since the detection member is turned on with a predetermined sensitivity, the light source of the detection member is turned on when the microwave electromagnetic field in the predetermined portion of the waveguide is greater than or equal to a predetermined value.
Accordingly, it is possible to visually know the electromagnetic field distribution in the waveguide by checking whether the light source of the detection member is turned off or turned on.

In the third invention, the waveguide is provided with a plurality of small holes formed along the tube axis, and a plurality of detection members in which an antenna is disposed in each of the small holes of the waveguide. Are arranged on the outer surface of the waveguide.
Therefore, the light sources of the detection members arranged in the tube axis direction of the waveguide are in a lighting state corresponding to the microwave electromagnetic field distribution or standing wave in the waveguide.
That is, the light source is turned on for the detection member in the portion where the microwave electromagnetic field is strong, and the light source is kept turned off in the detection member in the portion where the microwave electromagnetic field is weak. The field distribution can be visually recognized, and the position of the standing wave can be detected visually.

On the other hand, according to the third invention, when the standing wave position in the waveguide is moved by operating a movable plunger or the like, the light sources of the plurality of detection members arranged in the tube axis direction of the waveguide are Lights up sequentially as the waves move.
That is, since the light source to be turned on is sequentially switched according to the movement of the standing wave, the position adjustment of the standing wave can be performed while confirming the lighting of the light source of the detection member.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a simplified diagram of a microwave heating test apparatus equipped with a microwave visible sensor 50 shown as an embodiment.
As shown in the figure, this test apparatus is composed of a magnetron 30, a high-frequency coupler 31, a power monitor 32, a stub tuner 33, an applicator 34, and a movable plunger 35. Other than the applicator 34 provided with the microwave visible sensor 50. Has the same configuration as that of the conventional test apparatus shown in FIG.

As shown in FIGS. 2 and 3, the applicator 34 is a rectangular waveguide, and an upper surface (magnetic field H surface) 34H is provided with an insertion hole 34a for inserting the test tube 17 similar to the conventional example. .
The test tube 17 contains a sample for testing a chemical reaction or chemical change caused by microwave heating, as described in the conventional example.

A microwave visible sensor 50 is provided on the side surface (electric field E surface) 34E of the applicator 34.
This microwave visible sensor 50 is provided with a small diameter 36 formed in two rows along the tube axis direction and a plurality of detection members 37 on the side surface 34E of the applicator 34, and has a long diameter surfaced on the side surface 34E. A substrate 38 is included.
In addition, the board | substrate 38 fixed in this way is surfaced so that the antenna 39 of each detection member 37 may face each small hole 36, as shown in detail as a partial enlarged view in FIG.
Further, as means for fixing the substrate 38 to the applicator 34, screwing, adhesion using an adhesive, or the like is used.

The plurality of detection members 37 are provided on the elongated substrate 38 between the positions corresponding to the positions of the small holes of the applicator 34. The individual detection members 37 are provided with the conventional detection unit 21A shown in FIG. It is comprised similarly to.
That is, the detection member 37 includes a long antenna 39 that receives microwaves, a detection diode 40 that is turned on by receiving an electromotive force generated in the antenna 39, an LED 41 that is lit when the detection diode 40 is turned on, and a detection diode 40 and the circuit line 42 which connects LED41.

And as a concrete structure of this detection member 37, as shown in FIG. 4, FIG.
The detection diode 40 and the LED 41 are mounted on the surface of the substrate 38 by soldering on the surface, and the detection diode 40 and the LED 41 are connected by a circuit line 42 printed on the surface of the substrate 38. The LED 41 is electrically connected to the antenna 39 printed on the back surface of the substrate 38 through the through holes 43a and 43b, and has the circuit connection shown in FIG.

In the above test apparatus, the traveling wave of the microwave output from the magnetron 30 interferes with the reflected wave reflected by the plunger movable portion 35 a of the movable plunger 35, and a large standing wave is generated in the applicator 34. .
Then, the sample 17 is heated and tested by the large electric field generated by the standing wave.

Accordingly, the movable plunger 35 is operated to move the plunger movable portion 35a, the standing wave generation position is adjusted, and the standing wave is correctly generated at the position of the sample 17.
As described above, when the position of the standing wave is adjusted by operating the movable plunger 35, the lighting of the LEDs 41 of the respective detection members 37 aligned in accordance with the movement of the standing wave is sequentially switched.
Specifically, in FIG. 2, since the lighting of the detection member 37 is sequentially switched from right to left or vice versa, the movable plunger 35 is operated while viewing the lighting state (LED 41) of the detection member 37, and the sample 17 can be adjusted to a standing wave position where the strongest electric field acts.

Although the preferred embodiment of the present invention has been described above, since the presence of a standing wave can be known without using a power monitor, it can be used for matching a tuner of a waveguide.
Furthermore, when one small hole is provided on the side surface of the applicator 34 that matches the sample 17 and one detection member 37 is disposed in the small hole, the light emission intensity of the LED 41 changes according to the operation of the movable plunger 35. Therefore, the electric field strength of the microwave can be confirmed visually.

On the other hand, in carrying out the present invention, the antenna 39 may be provided on the surface of the substrate 38 together with the detection diode 40, the LED 41, and the circuit line 42.
When configured in this manner, the sensitivity slightly decreases, but it works sufficiently as a detection member.
On the other hand, the detection members 37 do not necessarily have to be arranged in two rows, and may be microwave visible sensors arranged in a straight line, and the microwave visible sensor 50 configured as described above is the detection member 37. Can be arbitrarily increased or decreased.
Furthermore, a similar microwave visible sensor can be configured by forming a plurality of small holes on the upper surface 34H of the applicator 34 and arranging a plurality of detection members 37 on the upper surface 34H.

FIG. 7 is a partial view of a microwave visible sensor shown as another embodiment.
In the present embodiment, two connection terminals 44 a and 44 b of the LED 44 are inserted into a small hole 36 a formed in the applicator 34, and the connection terminals 44 a and 44 b are further connected by a detection diode 45. As a visible sensor.
In the microwave visible sensor configured in this way, since the connection terminals 44a and 44b receive microwaves, the detection diode 45 is turned on by the electromotive force generated at these connection terminals, and the LED 44 is lit.
FIG. 7 shows the microwave visible sensor provided in one small hole 36a, but a plurality of LEDs 44 may be provided similarly by forming a plurality of small holes 36a.

  It is desirable to visually detect the electric field distribution and standing wave position of the microwave, the microwave heating test device, the recording film destruction device of the information recording disk using the microwave, the microwave heating yarn (filament) It can be applied to a microwave application device such as a stretching device.

1 is a simplified diagram illustrating a microwave heating test apparatus equipped with a microwave visible sensor according to one embodiment. FIG. It is an expanded partial view which shows the applicator with which an above-described test apparatus is equipped, and the microwave visible sensor with which this applicator was equipped. It is a disassembled perspective view of an above-mentioned applicator and a microwave visible sensor. It is a surface view which expands and shows a part of above-mentioned microwave visible sensor. It is a back view similar to FIG. It is a circuit diagram of the detection member with which the above-mentioned microwave visible sensor is equipped. It is a fragmentary figure which shows the microwave visible sensor of other embodiment. It is a simplified diagram showing a testing apparatus for microwave heating of a conventional example. It is a partial expanded sectional view of the conventional test apparatus shown in FIG. It is a front view which shows the conventional detection apparatus which detects the electric field distribution of a microwave. It is the fragmentary figure which expanded and showed a part of conventional detection apparatus of FIG. It is a circuit diagram of the detection part which has a long diameter antenna among the detection parts with which the conventional detection apparatus of FIG. 10 is equipped. It is a circuit diagram of the detection part which has a short diameter antenna among the detection parts with which the conventional detection apparatus of FIG. 10 is provided.

Explanation of symbols

34 Applicator 34H Upper surface (magnetic surface)
34E Side surface (electric field surface)
36 Small hole 37 Detection member 38 Substrate 39 Antenna 40 Detection diode 41 LED
42 Circuit lines 43a, 43b Through hole 50 Microwave visible sensor

Claims (3)

Provided is a detection member formed from an antenna that receives microwaves, a diode that detects microwaves received by the antenna, and a light source that is powered and lit according to detection of the diodes,
The detection member is provided in the waveguide so that the antenna of the detection member is disposed corresponding to the small hole formed in the waveguide,
A microwave visible sensor characterized in that lighting of a light source of the detection member is visually confirmed to detect a microwave existing in a waveguide. An antenna for receiving microwaves is disposed on the back surface of the substrate, and a diode for detecting the microwaves received by the antenna is connected to the antenna surface through a through hole on the surface of the substrate, and Providing a detection member formed by arranging a light source that is powered and lit according to detection,
The substrate of the detection member is fixed to the outer surface of the waveguide so that the antenna of the detection member is disposed corresponding to the small hole formed in the waveguide,
A microwave visible sensor characterized in that lighting of a light source of the detection member is visually confirmed to detect a microwave existing in a waveguide. An antenna for receiving microwaves is disposed on the back surface of the substrate, and a diode for detecting the microwaves received by the antenna is connected to the antenna surface through a through hole on the surface of the substrate, and A plurality of detection members formed by arranging a light source that is powered and turned on according to detection along the longitudinal direction of the long substrate,
The substrate is fixed to the outer surface of the waveguide so that the antenna of each detection member is disposed in a plurality of small holes formed along the tube axis direction of the waveguide,
A microwave visible sensor characterized in that a lighting state of a light source of each detection member described above is visually confirmed to detect a microwave electric field intensity distribution or a microwave standing wave position in a waveguide.

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