JP2004333129A - Reference heat source for electromagnetic wave test to infrared radiation measuring device, and method for testing thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reference heat source to be used for an electromagnetic wave test to an infrared radiation measuring device, and a testing method for that, without being affected by electromagnetic waves at all to solve problems in conventional devices using electric heaters. <P>SOLUTION: This reference heat source for an electromagnetic wave test to an infrared radiation measuring device comprises a target 1 of resin as a false black body source, fluid type heat medium to heat the target, and a device of resin to circulate the heat medium. As the reference heat source, a container of resin, the target, and fluid heating or the like are used. No electric heaters are used, and metal material is not used for peripheral devices. The reference heat source for an electromagnetic wave test to the infrared radiation measuring device thus achieves high precision without being affected by electromagnetic waves at all. The electromagnetic test can thus be conducted using it. By using transparent resin such as acrylic resin, a display part in the infrared radiation measuring device can be easily recognized by a monitoring camera or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００１７】
（ターゲットの安定性の調査）
耳式体温計（分解能０．０１°Ｃ）を用いて、時間間隔１０分毎の輝度温度を測定し、１時間の安定性を調べた。この結果を図９に示す。
図９から明らかなように、１時間（６０ｍｉｎ）において、試験対象としている耳式体温計が分解能０．１°Ｃに対して、ｐ−ｐが５０ｍＫ程度の変動であることから、本ターゲットは十分な安定性を持っていると言える。
【００１８】
【発明の効果】
本発明は、参照熱源として、樹脂製の容器、ターゲット、流体加熱等を用い、電気加熱ヒーターを一切使用せず、また周辺の機器に金属製材料を使用しないことによって、電磁波の影響を全く受けないようにすることができる精度の高い赤外放射計測機器の電磁波試験用参照熱源とし、それを用いて電磁波試験を行うことができるという優れた効果を有する。また、アクリル樹脂等の透明の樹脂を使用することによって、監視用カメラ等による赤外放射計測機器の表示部の確認を容易とする効果を有する。
【図面の簡単な説明】
【図１】耳式体温計の参照熱源を使用した実施（試験）装置の説明図である。
【図２】筒型参照熱源装置の水平断面説明図である。
【図３】熱画像装置によるターゲットの温度分布を示す図である。
【図４】アンプの出力値をモニターする場合の、電界センサーのみを設置し、ターゲットを置かない状態の説明図である。
【図５】アンプの出力値をモニターする場合の、電界センサーとターゲットを設置した状態の説明図である。
【図６】アンプの出力値をモニターする場合の、ターゲット、耳式体温計、該耳式体温計の近くに電界センサーを置いた場合における説明図である。
【図７】水平アンプ出力値を示す図である。
【図８】垂直アンプ出力値を示す図である。
【図９】耳式体温計（分解能０．０１°Ｃ）を用いて、時間間隔１０分毎の輝度温度を測定した結果を示す図である。
【符号の説明】
１．ターゲット
２．液体を流動させるホース
３．アンテナ
４．電界センサー
５．耳式体温計[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reference heat source for an electromagnetic wave test of an infrared radiation measuring instrument and a test method thereof.
[0002]
[Prior art]
Generally, as a reference heat source in a test of an infrared radiation measuring instrument or the like, a “black body furnace” that controls the temperature of a metal material having a high emissivity by an electric heater or the like is used.
For example, in Patent Document 1, a material having good thermal conductivity, such as carbon, copper, or stainless steel, is used as a hollow blackbody furnace for calibration of a radiation thermometer, and a heater in the apparatus is used as a heating means for the hollow blackbody. Oil is used. The hollow black body is immersed in this heating oil.
Patent Literature 2 discloses a device in which a blackbody furnace is made of high-purity alumina, the periphery thereof is surrounded by an electric heater, and voltage, current, and electric power are controlled to control heating.
Patent Document 3 describes a blackbody furnace in which cone-shaped carbonaceous rods are arranged, and a method of providing a heating means at the bottom of the furnace and heating with a nichrome wire heater or a sheet heater is adopted. I have.
[0003]
The major problem of the blackbody furnace in the related art using the above-described electric heater is that the electromagnetic wave is disturbed because the blackbody furnace is constituted by heating by the electric heater and peripheral metal devices.
In addition, the blackbody furnace itself is also affected by the electromagnetic waves, making it impossible to perform normal temperature control, and making it impossible to properly evaluate the infrared radiation measurement device in conducting the electromagnetic wave test.
[0004]
[Patent Document 1]
JP 2001-147162 A [Patent Document 2]
JP-A-7-270256 [Patent Document 3]
JP-A-8-54285
[Problems to be solved by the invention]
An object of the present invention is to provide a reference heat source used for an electromagnetic wave test on an infrared radiation measuring device which is not affected by an electromagnetic wave at all, and a test method thereof in view of the conventional problem using an electric heater.
[0006]
[Means for Solving the Problems]
The present invention does not use any electric heater in the "black body" which is a reference heat source in order to completely eliminate the influence of the electromagnetic wave in the electromagnetic wave test of the infrared radiation measuring device. We have found that this can be achieved by not using any metal materials for equipment installed in the environment.
The present invention is based on this finding,
1. 1. A reference heat source for electromagnetic wave testing of infrared radiation measurement equipment, comprising a resin target serving as a pseudo black body source, a fluid heat medium for heating the target, and a resin device for circulating the heat medium. 2. The reference heat source according to 1 above, wherein no metal material or electric circuit is used in all test equipment within the range affected by the electromagnetic waves. 3. The reference heat source according to 1 or 2, wherein the heat medium is circulated by a resin hose to heat the target. 4. The reference heat source according to any one of the above items 1 to 3, which is used as an electromagnetic wave environment test device of an infrared radiation measuring instrument. The reference heat source according to any one of the above items 1 to 4, wherein a transparent resin is used in a visible wavelength region.
[0007]
Further, the present invention
6. In the electromagnetic wave test of the infrared radiation measuring device, a resin target serving as a black body source is used as a reference heat source, and the target is heated with a fluid heat medium using a resin circulating device. 6. Testing method for radiation measurement equipment 7. The test method according to the above item 6, wherein a metal material or an electric circuit is not used for all test devices within a range affected by the electromagnetic wave. 8. The test method according to the above item 6 or 7, wherein the heat medium is circulated by a resin hose to heat the target. 9. The test method according to any one of the above items 6 to 8, wherein the temperature is controlled by circulating a heating medium using a liquid temperature control device installed outside the range affected by the electromagnetic waves. The test method according to any one of the above items 6 to 9, wherein the use of a transparent resin makes it easy to confirm the display portion of the infrared radiation measuring device with a monitoring camera or the like.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, the reference heat source for the electromagnetic wave test of the infrared radiation measuring device of the present invention uses a resin target as a black body source. In addition, a fluid heat medium (a liquid such as water or oil) is used to heat the target, and a resin hose or the like is used as a circulation device for circulating the heat medium. The “resin” referred to here is a resin that has a material that is not affected by electromagnetic waves and is made of a polymer material.
That is, in the present invention, the black body is heated by fluid heating in all the test devices within the range affected by the electromagnetic wave, without using any electric heater, metal material, or material that generates the electromagnetic wave such as an electric circuit. As a reference heat source.
[0009]
As a result, a highly accurate reference heat source can be used as a reference heat source for an electromagnetic wave test of an infrared radiation measurement device such as an ear thermometer, a radiation thermometer, and a thermal imaging device (thermograph).
As the resin, a transparent resin such as an acrylic resin in a visible region can be used. A polymer material such as an acrylic resin is transparent in a visible wavelength range, but has a strong infrared absorption characteristic in an infrared wavelength range observed by an infrared radiation measuring instrument, and thus has a feature as a high emissivity material. Therefore, in the present invention, a heat radiation source (pseudo black body) can be realized without performing the blackening process.
This point is a very important point, and was first discovered in the present invention, and a test of an infrared radiation measuring instrument can be realized without being affected by electromagnetic waves.
[0010]
In addition, the use of such a transparent resin also has an excellent effect that it is easy to confirm the display unit of the infrared radiation measuring device with a monitoring camera or the like.
As described above, the additional blackening (blackening) treatment is unnecessary, but the blackening treatment of the transparent acrylic resin or the like is not a hindrance. In the present invention, the surface of a target made of an acrylic resin or the like can be subjected to a blackening treatment if necessary. The present invention includes all of them.
Since a long hose can be used for circulation of the heating medium, the liquid temperature control device can be installed outside the range affected by the electromagnetic waves to control the temperature. The apparatus of the present invention is suitable for measuring infrared radiation in a measurement wavelength range of 3 to 20 μm. However, the present invention is not limited to a specific measurement wavelength range, but can be applied to any measurement range.
[0011]
At present, the product standard for ear thermometers is currently being worked on in Europe, but an electromagnetic wave test is required in the European standard prEN12470-5, and an electromagnetic wave test is also required in the American standard ASTM standard E1965-98. .
In Japan, a JIS standard for ear thermometers has not been established yet, but this JIS draft has been completed, and according to this, an electromagnetic wave test is required.
The present invention can be directly applied to these, and in view of the above trends, the electromagnetic wave test is a necessary condition worldwide, and thus the present invention can be said to be extremely useful.
[0012]
Next, examples of the present invention, results of investigations on the influence of an electric field due to the presence or absence of a target, the luminance temperature of the target, and the stability of the target will be described.
It should be noted that these examples and the like are for the purpose of facilitating understanding of the present invention and its effects, and the present invention is not limited to these descriptions.
Therefore, all modifications, modes, and other examples based on the technical concept of the present invention are included in the present invention.
[0013]
(Example)
An implementation (test) apparatus using a reference heat source of an ear thermometer is shown in FIG. The target 1 had an outer diameter of about 24 mmφ, the length of the hose 2 was 4.2 m, and a transparent acrylic resin was used for each material.
The structure of the reference heat source device is cylindrical as shown in FIG. 1, and FIG. 2 is an explanatory view of a horizontal section thereof. The heating liquid (hot water) flows inside the cylinder, that is, inside the target 1.
A device (not shown) for heating the liquid is separately provided, and controls the temperature of the liquid flowing through the hose 2. Thereby, hot water circulates through the target 1 of the reference heat source, and the center of the target 1 is heated.
When the temperature distribution was confirmed using a thermal imaging apparatus, it was confirmed that the temperature at the center of the target was the highest. FIG. 3 shows a temperature distribution of the target 1. Pp was 0.1 degreeC in the range of the diameter of 1.86 mm.
[0014]
(Survey of influence of electric field depending on presence / absence of target)
The height of the antenna 3 was set at about 1.5 m from the center of the antenna 3 as a base point. The direction of the antenna 3 was set for each of the horizontal and vertical directions. The distance between the antenna 3, the target 1, the electric field sensor 4, and the ear thermometer 5 was about 3 m each.
As a study of the influence of the electric field, first, the state of the electric field without the target 1 was measured. The output value of the amplifier at this time was monitored (FIG. 4).
Next, the influence of the electric field in the state where the target 1 was installed was measured. The position of the electric field sensor 4 was set at the same position as the position of the ear thermometer 5 (FIG. 5).
Next, with the target 1 installed, the ear thermometer 5 was also installed, the electric field sensor 4 was placed as close to the ear thermometer 5 as possible, and the effect of the electric field was measured (the output value of the amplifier was monitored) (FIG. 6). ).
For the above, the measurement was performed with a frequency range of 26 to 1000 MHz, a frequency step method: an equal ratio of 10%, and a stay time: 20 seconds.
FIG. 7 shows a horizontal amplifier output value based on the above results, and FIG. 8 shows a vertical amplifier output value. In each case, the output value of the amplifier did not change significantly, and it was confirmed that the electric field was not disturbed by placing the target of this example.
[0015]
(Survey of target brightness temperature)
In order to confirm the brightness temperature using an ear thermometer, the brightness was measured using four different types of ear thermometers. Table 1 shows the results. As is evident from Table 1, no significant difference was observed in the luminance temperature and the variation of the measurement in each ear thermometer. Therefore, it was confirmed that this target had sufficient performance when performing a test on an ear thermometer having a resolution of 0.1 ° C.
[0016]
[Table 1]

[0017]
(Investigation of target stability)
Using an ear thermometer (resolution 0.01 ° C.), the luminance temperature was measured at intervals of 10 minutes, and the stability for 1 hour was examined. The result is shown in FIG.
As is clear from FIG. 9, since the ear thermometer to be tested has a fluctuation of about 50 mK with respect to the resolution of 0.1 ° C. for 1 hour (60 min), the target is sufficient. It can be said that it has excellent stability.
[0018]
【The invention's effect】
The present invention uses a resin container, target, fluid heating, or the like as a reference heat source, does not use an electric heater at all, and does not use metal materials for peripheral devices, so that it is completely affected by electromagnetic waves. It has an excellent effect that it can be used as a reference heat source for an electromagnetic wave test of a highly accurate infrared radiation measurement device that can be used to perform an electromagnetic wave test using the reference heat source. In addition, by using a transparent resin such as an acrylic resin, there is an effect that it is easy to check the display unit of the infrared radiation measuring instrument with a monitoring camera or the like.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an implementation (test) apparatus using a reference heat source of an ear thermometer.
FIG. 2 is an explanatory horizontal sectional view of a cylindrical reference heat source device.
FIG. 3 is a diagram showing a temperature distribution of a target by a thermal imaging device.
FIG. 4 is an explanatory diagram illustrating a state in which only an electric field sensor is installed and a target is not installed when monitoring the output value of the amplifier.
FIG. 5 is an explanatory diagram of a state where an electric field sensor and a target are installed when monitoring an output value of an amplifier.
FIG. 6 is an explanatory diagram when a target, an ear thermometer, and an electric field sensor are placed near the ear thermometer when monitoring the output value of the amplifier.
FIG. 7 is a diagram showing a horizontal amplifier output value.
FIG. 8 is a diagram showing output values of a vertical amplifier.
FIG. 9 is a diagram showing the results of measuring the brightness temperature at time intervals of 10 minutes using an ear thermometer (resolution 0.01 ° C.).
[Explanation of symbols]
1. Target 2. 2. Hose for flowing liquid Antenna4. Electric field sensor5. Ear thermometer

Claims (10)

A reference heat source for electromagnetic wave testing of infrared radiation measuring equipment, comprising a resin target serving as a pseudo black body source, a fluid heat medium for heating the target, and a resin device for circulating the heat medium. 2. The reference heat source according to claim 1, wherein a metal material or an electric circuit is not used for all devices within a range affected by the electromagnetic wave. The reference heat source according to claim 1 or 2, wherein the target is heated by circulating a heat medium through a resin hose. The reference heat source according to any one of claims 1 to 3, which is used as an electromagnetic wave test device of an infrared radiation measuring device. The reference heat source according to claim 1, wherein a transparent resin is used in a visible wavelength region. In the electromagnetic wave test of the infrared radiation measuring device, a target made of a resin which is a black body source is used as a reference heat source, and the target is heated by a fluid heat medium using a resin circulating device. An electromagnetic wave test method for radiation measurement equipment. 7. The test method according to claim 6, wherein a metal material or an electric circuit is not used in all test devices within a range affected by the electromagnetic wave. The test method according to claim 6 or 7, wherein the target is heated by circulating a heat medium through a resin hose. The test method according to any one of claims 6 to 8, wherein the temperature is controlled by circulating a heating medium using a liquid temperature control device installed outside the range affected by the electromagnetic waves. The test method according to any one of claims 6 to 9, wherein use of a transparent resin facilitates confirmation of a display portion of the infrared radiation measuring device by a monitoring camera or the like.

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