CN220670726U - A radiation temperature error measuring device - Google Patents

Abstract

The utility model discloses a radiation temperature error measuring device, wherein the device comprises: the device comprises a flat test piece, a standard infrared temperature measurement combination, an infrared thermometer to be detected, a first heater and a second heater; two cylindrical cavities are formed in the flat plate test piece, one cylindrical cavity is a first equivalent black body, and the other cylindrical cavity is a second equivalent black body; the standard infrared temperature measurement combination is arranged on the outer side of the flat test piece; the first heater is arranged on one side of the flat test piece, the second heater is arranged on the other side of the flat test piece, the first heater is opposite to the second heater, and the first heater and the second heater are used for heating the flat test piece; the infrared thermometer to be detected is arranged on one side, far away from the flat-plate test piece, of the second heater. The utility model avoids the influence of the radiation light interference of the heater and the change of the target emissivity on the temperature measurement reference, thereby realizing the accurate temperature measurement error of the infrared thermometer in the radiation heating environment.

Description

A radiation temperature error measuring device

Technical field

The invention belongs to the technical field of non-contact infrared temperature measurement, and in particular relates to a radiation temperature error measurement device.

Background technique

Temperature parameters are the most basic and important thermal environment parameters in radiant heating tests. Temperature testing mainly uses two technologies: contact and non-contact. Contact temperature measurement mainly uses thermocouple sensors, which have the characteristics of low cost and high temperature measurement accuracy, but the long-term use temperature is below 1600°C (type B thermocouple); tungsten-rhenium thermocouple has a high melting point (higher than 3000°C) , The thermoelectric potential is large, but when the temperature is higher than 500°C, it is easily oxidized rapidly, causing temperature measurement failure. On the other hand, contact temperature measurement will change the thermal field distribution of the structure and bring certain errors to the simulation of real flight conditions. In contrast, non-contact temperature measurement mainly uses infrared thermometers and relies on the blackbody radiation law to obtain the target temperature. Non-contact radiation temperature measurement has the characteristics of a wide temperature measurement range and does not destroy the thermal field distribution of the structure. It plays a decisive role in radiation heating tests.

However, how to evaluate the accuracy of temperature measurement by an infrared radiation thermometer in a radiation heating environment is crucial to the assessment of radiant heat tests. There are two main evaluation methods commonly used. One is to calibrate the infrared thermometer through a high-temperature reference source (such as a high-temperature blackbody furnace) in a laboratory environment. There is a big difference between the laboratory environment and the radiant heating environment of the structural thermal test. This is mainly reflected in the fact that during the heating process of the structural thermal test, the radiant light interference of the heater will be reflected into the infrared thermometer through the test piece, while the laboratory environment Calibration does not have this problem, which results in the evaluation method of infrared thermometers in the laboratory environment not being suitable for structural thermal testing. Another evaluation method is to install a thermocouple on the test piece as a temperature measurement reference, and compare it with the temperature measured by the infrared thermometer in a radiant heating environment. This method has a limited upper limit of thermocouple temperature measurement (not exceeding 1600°C), and the thermocouple also has the problem of inaccurate temperature measurement due to the influence of other factors during the heating process, so it cannot be used as a temperature measurement benchmark.

Contents of the invention

The technical problem solved by the present invention is to overcome the shortcomings of the existing technology and provide a radiation temperature error measuring device, which introduces an equivalent black body into a radiation heating environment and avoids the interference of the heater radiation light and the change of the target emissivity on the temperature measurement. The influence of the reference is achieved, thereby achieving accurate temperature measurement error of the infrared thermometer in a radiation heating environment.

The object of the present invention is achieved through the following technical solutions: a radiation temperature error measurement device, including: a flat test piece, a standard infrared temperature measurement combination, an infrared thermometer to be tested, a first heater and a second heater; wherein, Two cylindrical cavities are provided inside the flat specimen. One cylindrical cavity is the first equivalent black body, and the other cylindrical cavity is the second equivalent black body. The first equivalent black body is located at the edge of the flat specimen. At one end, the second equivalent black body is located at the other end of the flat test piece; the standard infrared temperature measurement combination is set outside the flat test piece, and the standard infrared temperature measurement combination is used to test the first The temperatures of the equivalent black body and the second equivalent black body; the first heater is arranged on one side of the flat test piece, and the second heater is arranged on the other side of the flat test piece, so The first heater and the second heater are opposite, and the first heater and the second heater are used to heat the flat test piece; the infrared thermometer to be detected is arranged on the second The heater is located away from the side of the flat specimen.

In the above radiation temperature error measuring device, the standard infrared temperature measurement combination includes a first standard infrared thermometer and a second standard infrared thermometer; wherein the first standard infrared thermometer is located at the edge of the flat test piece. Outside one end, the first standard infrared thermometer is used to test the temperature of the first equivalent black body; the second standard infrared thermometer is located outside one end of the flat test piece, and the second A standard infrared thermometer is used to test the temperature of the second equivalent black body.

In the above radiation temperature error measuring device, the standard infrared temperature measurement combination includes a first standard infrared thermometer and a thermocouple; wherein the first standard infrared thermometer is located outside one end of the flat test piece, so The first standard infrared thermometer is used to test the temperature of the first equivalent black body; the thermocouple is arranged in the second equivalent black body, and the thermocouple is used to test the first equivalent black body temperature.

The above-mentioned radiation temperature error measuring device further includes: a data acquisition device; wherein, when the first heater and the second heater heat the flat specimen to a preset target temperature, the first standard infrared The thermometer measured the temperature of the first equivalent black body, the second standard infrared thermometer measured the temperature of the second equivalent black body, and the infrared thermometer to be tested measured the flat plate test The temperature of the component; the data acquisition device is based on the temperature of the first equivalent black body measured by the first standard infrared thermometer and the second equivalent temperature measured by the second standard infrared thermometer. The average temperature is obtained from the temperature of the black body, and the temperature measurement error at the preset target temperature is obtained based on the average temperature and the temperature of the flat test piece measured by the infrared thermometer to be tested.

The above-mentioned radiation temperature error measuring device further includes: a data acquisition device; wherein, when the first heater and the second heater heat the flat specimen to a preset target temperature, the first standard infrared The thermometer measures the temperature of the first equivalent black body, the thermocouple measures the temperature of the second equivalent black body, and the infrared thermometer to be detected measures the temperature of the flat test piece; The data acquisition device obtains an average temperature based on the temperature of the first equivalent black body measured by the first standard infrared thermometer and the temperature of the second equivalent black body measured by the thermocouple. According to the average temperature and the temperature of the flat test piece measured by the infrared thermometer to be inspected to obtain the temperature measurement error at the preset target temperature.

In the above radiation temperature error measuring device, the ratio of the cavity length of the first equivalent black body to the cavity opening diameter is not less than 10.

In the above radiation temperature error measuring device, the ratio of the cavity length of the second equivalent black body to the cavity opening diameter is not less than 10.

In the above radiation temperature error measuring device, the flat specimen is graphite.

In the above radiation temperature error measuring device, the first heater is a quartz lamp, and the second heater is a quartz lamp.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention introduces the equivalent black body into the radiation heating environment, avoiding the interference of the heater's radiation light and the influence of the target emissivity change on the temperature measurement benchmark, thereby achieving accurate temperature measurement of the infrared thermometer in the radiation heating environment. Error has promoted the development of temperature testing technology for radiant heating tests;

(2) As long as L:D≥10, the spectral emissivity of the flat plate specimen designed by the present invention with embedded equivalent black body can meet its requirements as a black body, because its emissivity remains unchanged and is not interfered by heater radiation. The influence ensures the accuracy of temperature measurement by standard infrared thermometer and solves the problem of being unable to obtain the true temperature of the test piece in a radiation heating environment;

(3) The present invention adopts a double-sided heating method to ensure the uniformity of heating of the equivalent blackbody flat specimen, making the temperature inside and outside the blackbody cavity consistent, and providing a basic guarantee for the error evaluation of radiation temperature measurement.

Description of the drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be construed as limiting the invention. Also throughout the drawings, the same reference characters are used to designate the same components. In the attached picture:

Figure 1 is a diagram showing the relationship between different L:D ratios and emissivity in Monte Carlo simulation provided by the embodiment of the present invention;

Figure 2 is a schematic diagram of a first equivalent black body or a second equivalent black body provided by an embodiment of the present invention;

Figure 3 is a schematic diagram of a flat specimen provided by an embodiment of the present invention;

Figure 4 is a schematic structural diagram of a radiation temperature error measuring device provided by an embodiment of the present invention;

Figure 5 is another structural schematic diagram of a radiation temperature error measuring device provided by an embodiment of the present invention;

Figure 6 is a flow chart of a radiation temperature error measurement method provided by an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a thorough understanding of the disclosure, and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figure 4 or Figure 5, this embodiment provides a radiation temperature error measurement device, including: a flat test piece 2, a standard infrared temperature measurement combination, an infrared thermometer to be tested 4, a first heater 6 and a third Two heaters 7; among them, two cylindrical cavities are provided inside the flat specimen 2, one cylindrical cavity is the first equivalent black body 1-1, and the other cylindrical cavity is the second equivalent black body 1-2. An equivalent black body 1-1 is located at one end of the flat specimen 2, and a second equivalent black body 1-2 is located at the other end of the flat specimen 2; a standard infrared temperature measurement combination is set outside the flat specimen 2, and the standard infrared temperature measurement The combination is used to test the temperature of the first equivalent black body 1-1 and the second equivalent black body 1-2; the first heater 6 is arranged on one side of the flat specimen 2, and the second heater 7 is arranged on the flat specimen 2 On the other side, the first heater 6 and the second heater 7 are opposite, and the first heater 6 and the second heater 7 are used to heat the flat test piece 2; the infrared thermometer 4 to be tested is set at the second heating The device 7 is away from the side of the flat specimen 2.

As shown in Figure 4, the standard infrared temperature measurement combination includes a first standard infrared thermometer 3 and a second standard infrared thermometer 5; among them, the first standard infrared thermometer 3 is located outside one end of the flat test piece 2, The first standard infrared thermometer 3 is used to test the temperature of the first equivalent black body 1-1; the second standard infrared thermometer 5 is located outside one end of the flat test piece 2, and the second standard infrared thermometer 5 is used to test the temperature of the first equivalent black body 1-1. Test the temperature of the second equivalent black body 1-2.

As shown in Figure 5, the standard infrared temperature measurement combination includes a first standard infrared thermometer 3 and a thermocouple 8; among them, the first standard infrared thermometer 3 is located outside one end of the flat specimen 2, and the first standard infrared thermometer 3 The thermometer 3 is used to test the temperature of the first equivalent black body 1-1; the thermocouple 8 is set in the second equivalent black body 1-2, and the thermocouple 8 is used to test the temperature of the first equivalent black body 1-1.

The radiation temperature error measurement device also includes: a data acquisition device.

When the first heater 6 and the second heater 7 heat the flat specimen 2 to the preset target temperature, the first standard infrared thermometer 3 measures the temperature of the first equivalent black body 1-1, and the second standard infrared thermometer 3 measures the temperature of the first equivalent black body 1-1. The thermometer 5 measures the temperature of the second equivalent black body 1-2, and the infrared thermometer 4 to be tested measures the temperature of the flat test piece 2; the data acquisition device measures the temperature of the first standard infrared thermometer 3 based on the first temperature. The temperature of the effective black body 1-1 and the temperature of the second equivalent black body 1-2 measured by the second standard infrared thermometer 5 are used to obtain the average temperature. According to the average temperature and the flat test piece measured by the infrared thermometer 4 to be tested The temperature of 2 is used to obtain the temperature measurement error at the preset target temperature.

Or when the first heater 6 and the second heater 7 heat the flat specimen 2 to the preset target temperature, the first standard infrared thermometer 3 measures the temperature of the first equivalent black body 1-1, and the thermocouple 8 measures The temperature of the second equivalent black body 1-2 is obtained, and the infrared thermometer 4 to be tested measures the temperature of the flat test piece 2; the data acquisition device measures the first equivalent black body 1-2 based on the first standard infrared thermometer 3. The temperature of 1 and the temperature of the second equivalent black body 1-2 measured by the thermocouple 8 are used to obtain the average temperature. According to the average temperature and the temperature of the flat specimen 2 measured by the infrared thermometer 4 to be tested, the preset target temperature is obtained. temperature measurement error.

The ratio of the cavity length to the cavity opening diameter of the first equivalent black body 1-1 is not less than 10. The ratio of the cavity length to the cavity opening diameter of the second equivalent black body 1-2 is not less than 10.

According to Kirchhoff's method of designing a black body, the cavity-opening structure uses multiple absorption and reflections of radiant energy in the cavity, and finally absorbs all of it, which is approximately considered to be an ideal black body. Considering the convenience of processing, in this embodiment, the equivalent black bodies (the first equivalent black body and the second equivalent black body) are designed as cylindrical cavity structures, and the selected material is graphite. In order to find the appropriate ratio of cavity length (L) to cavity opening diameter (D), the Monte Carlo method is used to simulate, change the L:D value, and calculate the equivalent blackbody emissivity.

As can be seen from Figure 1, L:D≥10, the emissivity of the equivalent blackbody (the first equivalent blackbody and the second equivalent blackbody) is not less than 0.9999, meeting the blackbody emissivity requirements.

Considering the uniformity of heating, the equivalent blackbody (the first equivalent blackbody and the second equivalent blackbody) is embedded in the flat specimen 2, that is, two cylindrical cavities and one cylindrical cavity are opened in the flat specimen 2. is the first equivalent black body 1-1, the other cylindrical cavity is the second equivalent black body 1-2, and the flat specimen is made of graphite, as shown in Figures 2 and 3.

The first standard infrared thermometer 3 and the second standard infrared thermometer 5 (or thermocouple 8) are used to test the cavity temperatures of the equivalent black body 1-1 and the equivalent black body 1-2 respectively. Since the first equivalent black body 1-1 and the second equivalent black body 1-2 are located in the flat specimen 2, they are not interfered by the heater radiated light, and the first equivalent black body 1-1 and the second equivalent black body 1 -2 The emissivity is approximately 1 and does not change with temperature, so the temperatures measured by the first standard infrared thermometer 3 and the second standard infrared thermometer 5 (or thermocouple 8) can be used as the temperature measurement benchmark. In addition to being used as a temperature measurement benchmark, the first standard infrared thermometer 3 and the second standard infrared thermometer 5 (or thermocouple 8) can also be used to determine whether the flat test piece is heated evenly.

In order to ensure that the flat specimen 2 is heated evenly, double heaters (the first heater 6 and the second heater 7) are used to heat it on both sides. The heating element of the heater is a graphite or quartz lamp.

The first standard infrared thermometer 3 is placed next to the first equivalent black body 1-1 of the flat test piece 2, and the second standard infrared thermometer 5 is placed next to the second equivalent black body 1-2 of the flat test piece 2. , the measured equivalent blackbody temperature is used as the temperature measurement benchmark. The infrared thermometer 4 to be tested is placed on the right side of the flat test piece 2, and the temperature of the flat test piece 2 is obtained through the gap between the heating elements of the second heater 7.

The first heater 6 and the second heater 7 uniformly heat the flat specimen 2 at the same time, and heat the specimen temperature to the target temperature 1. After stabilization (the first standard infrared thermometer 3, the second standard infrared thermometer 5. The temperature measured by the infrared thermometer 4 to be tested fluctuates no more than 1℃), record the temperatures measured by the first standard infrared thermometer 3 and the second standard infrared thermometer 5, and calculate the average temperature as T0; record the temperature to be tested. Detect the temperature T1 measured by the infrared thermometer 4. At this time, the temperature measurement error of the infrared thermometer 4 to be tested at the target temperature 1 is:

By analogy, the flat specimen 2 is heated to the target temperature 2, the target temperature 3... and the target temperature n. According to the above steps, the steady-state standard infrared thermometer 3 and the second standard infrared thermometer 5 are recorded. With the temperature measured by the infrared thermometer 4 to be tested, calculate the temperature measurement errors e2, e3...en of the infrared thermometer 4 to be tested at the corresponding temperature.

At this time, the maximum value of e1, e2, e3...en is the temperature measurement error of the infrared thermometer 4 to be tested in a radiation heating environment.

First of all, it needs to be explained that the black body here refers to the first equivalent black body or the second equivalent black body. It is preset that the equivalent blackbody cavity is a homogeneous body, its temperature is T, the surface emissivity of the equivalent blackbody cavity material is ε, the radius of the bottom surface of the equivalent blackbody cavity is r, the area is A1, the depth of the equivalent blackbody cavity is h, and the equivalent The area of the circle on the side of the blackbody cavity is A3, and the distance between the equivalent microelement surface on the side of the blackbody cavity and the microelement surface on the bottom surface of the blackbody cavity is l. φ ₁ and φ ₂ respectively refer to the normal direction of the microelement surface dA1 and microelement surface dA2 and r. angle, then the equivalent black body cavity equivalent blackness coefficient ε' is calculated as:

Equivalent to the following system of equations:

ε'=ε+ε·(1-ε)·A ₃ X _3,1 ;

As an auxiliary formula for Monte Carlo simulation, the above formula can make the emissivity of the equivalent blackbody cavity approach 1. The cylindrical cavity equivalent blackbody designed in this way can be used as a high-temperature reference source in a radiation heating environment.

Embodiment 1

1) Equivalent blackbody design and processing

According to the Monte Carlo simulation results, as long as the cylindrical cavity structure satisfies the ratio of cavity length (L) to cavity opening diameter (D) ≥ 10, its emissivity is greater than 0.99, meeting the blackbody emissivity requirements. Considering the uniformity of heating, the equivalent black body is embedded in the flat specimen 2, that is, the first equivalent black body 1-1 and the second equivalent black body 1-2 of a cylindrical cavity structure are processed in the flat specimen 2. To this end, the cylindrical cavity structure of this embodiment has a cavity length of first equivalent black body 1-1 and second equivalent black body 1-2L designed to be 125mm, an opening diameter D of 10mm, a length of flat plate specimen 2 designed to be 260mm, and a height of 60mm, thickness is 20mm. The material of flat specimen 2 is graphite.

Two equivalent black bodies (the first equivalent black body 1-1 and the second equivalent black body 1-2) are designed in the flat specimen 2. Since the first equivalent black body 1-1 and the second equivalent black body 1-2 are located in the flat specimen 2, they are not interfered by the heater radiated light, and the first equivalent black body 1-1 and the second equivalent black body 1 -2 The emissivity is approximately 1 and does not change with temperature, so the first standard infrared thermometer 3 and the second standard infrared thermometer 5 can be used as the temperature measurement benchmark. In addition to being used as a temperature measurement benchmark, the first standard infrared thermometer 3 and the second standard infrared thermometer 5 can also be used to determine whether the flat test piece 2 is heated evenly.

2) Heater selection

In order to ensure that the flat specimen 2 is heated evenly, double heaters (left heater 6 and right heater 7) are used to heat it on both sides, and the heating element of the heater is graphite.

3) Infrared thermometer temperature measurement error evaluation steps

In this embodiment, the temperature measurement ranges of the infrared thermometer 4 to be tested and the first standard infrared thermometer 3 and the second standard infrared thermometer 5 are 500°C to 2200°C. The first standard infrared thermometer 3 and the second standard infrared thermometer 5 The standard infrared thermometer 5 temperature measurement accuracy is 0.35%.

As shown in Figure 4, the first standard infrared thermometer 3 is placed next to the first equivalent black body 1-1 of the flat specimen 2, and the second standard infrared thermometer 5 is placed next to the second equivalent black body 1 of the flat specimen 2. Next to 1-2, the measured equivalent black body temperature is used as the temperature measurement benchmark. The infrared thermometer 4 to be tested is placed on the right side of the flat specimen 2, and the temperature of the flat specimen is obtained through the gap between the heating elements of the right heater 7.

The left heater 6 and the right heater 7 uniformly heat the flat specimen 2 at the same time, and the flat specimen 2 is heated to 500°C. When the first standard infrared thermometer 3 and the second standard infrared thermometer 5 measure, etc. If the difference between the effective blackbody temperatures is not greater than 0.5°C, and the temperature fluctuation measured by the first standard infrared thermometer 3, the second standard infrared thermometer 5, and the infrared thermometer to be tested 4 is not greater than 1°C, the flat plate test is determined at this time. Part 2 is heated evenly, and the temperature of the inner and outer walls is consistent, reaching a steady state.

Record the temperature T0 measured by the first standard infrared thermometer 3, the temperature T0’ measured by the second standard infrared thermometer 5, and the temperature T1 measured by the infrared thermometer 4 to be tested. Take the average temperature of the first standard infrared thermometer 3 and the second standard infrared thermometer 5 (T=(T0+T0')/2) as the temperature measurement benchmark. The infrared thermometer 4 to be tested is at 500°C. The temperature measurement error is:

By analogy, the flat specimen 2 is heated to 700°C, 1000°C, 1200°C, 1500°C, 1800°C, and 22000°C respectively. According to the above steps, record the temperatures measured by the first standard infrared thermometer 3, the second standard infrared thermometer 5 and the infrared thermometer to be tested 4 at each steady-state temperature, and calculate the infrared temperature to be tested at each temperature. The temperature measurement errors of thermometer 4 are e2, e3, e4, e5, e6, and e7.

Taking the maximum value of e1, e2, e3, e4, e5, e6, and e7 is the temperature measurement error of the infrared thermometer 4 to be tested in a radiation heating environment.

Embodiment 2

1) Equivalent blackbody design and processing

According to the Monte Carlo simulation results, as long as the cylindrical cavity structure satisfies the ratio of cavity length (L) to cavity opening diameter (D) ≥ 10, its emissivity is greater than 0.99, meeting the blackbody emissivity requirements. Considering the uniformity of heating, the equivalent black body is embedded in the flat specimen 2, that is, the first equivalent black body 1-1 and the second equivalent black body 1-2 of a cylindrical cavity structure are processed in the flat specimen 2. For this reason, the first equivalent black body 1-1 and the second equivalent black body 1-2 of the cylindrical cavity structure in this embodiment are designed to have a cavity length L of 125 mm, an opening diameter D of 10 mm, and a flat plate specimen 2 with a length of 260 mm and a height of 260 mm. is 60mm and the thickness is 20mm. The material of flat specimen 2 is graphite.

As shown in Figure 5, the flat specimen 2 is designed with two equivalent black bodies (the first equivalent black body 1-1 and the second equivalent black body 1-2), one of which is used for temperature measurement by the first standard infrared thermometer 3. Another second equivalent black body 1-2 cavity is equipped with a B-type thermocouple 8 to test the temperature in the cavity. Since the first equivalent black body 1-1 and the second equivalent black body 1-2 are located in the flat specimen 2, they are not interfered by the heater radiated light, and the first equivalent black body 1-1 and the second equivalent black body 1 -2 The emissivity is approximately 1 and does not change with temperature, so the first standard infrared thermometer 3 can be used as a temperature measurement benchmark. At the same time, the temperature measurement in the cavity also eliminates the problem of inaccurate temperature measurement caused by the influence of other factors on the B-type thermocouple 8, so the B-type thermocouple 8 can also be used as a temperature measurement benchmark. In addition to being used as a temperature measurement benchmark, the first standard infrared thermometer 3 and B-type thermocouple 8 can also be used to determine whether the flat specimen 2 is heated evenly.

2) Heater selection

In order to ensure that the flat specimen is heated evenly, double heaters (left heater 6 and right heater 7) are used to heat it on both sides. The heating element of the heater is graphite.

3) Infrared thermometer temperature measurement error evaluation steps

In this embodiment, the temperature measurement range of the infrared thermometer 4 to be tested and the first standard infrared thermometer 3 is 300°C ~ 1600°C. The temperature measurement range of the B-type thermocouple 8 is: 0 ~ 1800°C. The first standard infrared thermometer 3 The temperature measurement accuracy of the thermometer 3 is 0.35%, and the temperature measurement accuracy of the B-type thermocouple 8 is 0.25%.

The first standard infrared thermometer 3 is placed next to the first equivalent black body 1-1 of the flat specimen to measure the temperature of the cavity bottom of the first equivalent black body 1-1; the B-type thermocouple 8 is installed on the second equivalent black body 1-1. Black body 1-2 cavity bottom surface. The black body temperature measured by the first standard infrared thermometer 3 and B-type thermocouple 8 is used as the temperature measurement benchmark. The infrared thermometer 4 to be tested is placed on the right side of the flat specimen 2, and the temperature of the flat specimen 2 is obtained through the gap between the heating elements of the right heater 7.

The left heater 6 and the right heater 7 uniformly heat the flat specimen 2 at the same time, and the flat specimen 2 is heated to 300°C. When the equivalent black body temperature is measured by the first standard infrared thermometer 3 and the B-type thermocouple 8 The difference is not greater than 0.5°C, and the temperature fluctuation measured by the first standard infrared thermometer 3, B-type thermocouple 8, and the infrared thermometer to be tested 4 is not greater than 1°C. At this time, it is determined that the flat sample 2 is heated evenly. The temperature of the inner and outer walls is consistent and reaches a steady state.

Record the temperature T0 measured by the first standard infrared thermometer 3 and the temperature T0’ measured by the B-type thermocouple 8, as well as the temperature T1 measured by the infrared thermometer 4 to be tested. Take the average temperature (T=(T0+T0')/2) measured by the first standard infrared thermometer 3 and the B-type thermocouple 8 as the temperature measurement benchmark. The infrared thermometer 4 to be tested is at 300°C. The temperature measurement error is:

By analogy, the flat specimen 4 is heated to 500°C, 700°C, 900°C, 1100°C, 1300°C, and 1600°C respectively. Follow the above steps to record the temperatures measured by the first standard infrared thermometer 3, type B thermocouple 8 and the infrared thermometer to be tested 4 at each steady-state temperature, and calculate the infrared thermometer to be tested at each temperature. 4 temperature measurement errors e2, e3, e4, e5, e6, e7.

Taking the maximum value of e1, e2, e3, e4, e5, e6, and e7 is the temperature measurement error of the infrared thermometer 4 to be tested in a radiation heating environment.

As shown in Figure 6, this embodiment also provides a radiation temperature error measurement method, which includes the following steps:

Step S100: When the first heater 6 and the second heater 7 heat the flat specimen 2 to the preset target temperature, the first standard infrared thermometer 3 measures the temperature of the first equivalent black body 1-1, and the second The standard infrared thermometer 5 or thermocouple 8 measures the temperature of the second equivalent black body 1-2, and the infrared thermometer 4 to be tested measures the temperature of the flat test piece 2;

Step S200: The data acquisition device uses the temperature of the first equivalent black body 1-1 measured by the first standard infrared thermometer 3 and the second equivalent black body 1 measured by the second standard infrared thermometer 5 or thermocouple 8. The average temperature is obtained from the temperature of -2, and the temperature measurement error at the preset target temperature is obtained based on the average temperature and the temperature of the flat specimen 2 measured by the infrared thermometer 4 to be tested;

Step S300: When the first heater 6 and the second heater 7 heat the flat test piece 2 to the second preset target temperature, repeat steps S100 to S200 to obtain multiple temperature measurement errors, and take the multiple temperature measurement errors. The maximum value is taken as the temperature measurement error of the infrared thermometer to be tested in a radiation heating environment.

This embodiment introduces the equivalent black body into the radiation heating environment, avoiding the interference of the heater's radiation light and the influence of the target emissivity change on the temperature measurement benchmark, thereby achieving accurate temperature measurement error of the infrared thermometer in the radiation heating environment. Promotes the development of temperature testing technology for radiation heating tests; the spectral emissivity of the flat specimen designed in this embodiment with embedded equivalent blackbody can meet its requirements as a blackbody as long as L:D≥10, because its emissivity is not change, and is not affected by the radiation interference of the heater, ensuring the accuracy of temperature measurement by the standard infrared thermometer, and solving the problem of being unable to obtain the true temperature of the specimen in a radiation heating environment; this embodiment uses a double-sided heating method to ensure The uniformity of heating of the equivalent blackbody flat specimen makes the temperature inside and outside the blackbody cavity consistent, providing a basic guarantee for the error evaluation of radiation temperature measurement.

Although the present invention has been disclosed above in terms of preferred embodiments, they are not intended to limit the present invention. Any person skilled in the art can utilize the methods and technical contents disclosed above to improve the present invention without departing from the spirit and scope of the present invention. Possible changes and modifications are made to the technical solution. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention, all belong to the technical solution of the present invention. protected range.

Claims (9)

1. A radiation temperature error measuring device, characterized by comprising: a flat test piece (2), a standard infrared temperature measurement combination, an infrared thermometer to be tested (4), a first heater (6) and a second heater (7); among them, Two cylindrical cavities are provided inside the flat specimen (2), one cylindrical cavity is the first equivalent black body (1-1), and the other cylindrical cavity is the second equivalent black body (1-2). The first equivalent black body (1-1) is located at one end of the flat test piece (2), and the second equivalent black body (1-2) is located at the other end of the flat test piece (2); The standard infrared temperature measurement combination is arranged outside the flat test piece (2), and is used to test the first equivalent black body (1-1) and the second equivalent black body (1-2) temperature; The first heater (6) is disposed on one side of the flat test piece (2), the second heater (7) is disposed on the other side of the flat test piece (2), and the third heater (7) is disposed on the other side of the flat test piece (2). A heater (6) is opposite to the second heater (7), and the first heater (6) and the second heater (7) are used to heat the flat specimen (2); The infrared thermometer (4) to be detected is arranged on the side of the second heater (7) away from the flat test piece (2). 2. The radiation temperature error measuring device according to claim 1, characterized in that: the standard infrared temperature measurement combination includes a first standard infrared thermometer (3) and a second standard infrared thermometer (5); wherein , The first standard infrared thermometer (3) is located outside one end of the flat test piece (2), and the first standard infrared thermometer (3) is used to test the first equivalent black body (1 -1) temperature; The second standard infrared thermometer (5) is located outside one end of the flat test piece (2), and the second standard infrared thermometer (5) is used to test the second equivalent black body (1 -2) temperature. 3. The radiation temperature error measuring device according to claim 1, characterized in that: the standard infrared temperature measurement combination includes a first standard infrared thermometer (3) and a thermocouple (8); wherein, The first standard infrared thermometer (3) is located outside one end of the flat test piece (2), and the first standard infrared thermometer (3) is used to test the first equivalent black body (1 -1) temperature; The thermocouple (8) is arranged in the second equivalent black body (1-2), and the thermocouple (8) is used to test the temperature of the first equivalent black body (1-1). 4. The radiation temperature error measuring device according to claim 2, further comprising: a data acquisition device; wherein, When the first heater (6) and the second heater (7) heat the flat test piece (2) to the preset target temperature, the first standard infrared thermometer (3) measures The temperature of the first equivalent black body (1-1), the temperature of the second equivalent black body (1-2) measured by the second standard infrared thermometer (5), the infrared detector to be detected The thermometer (4) measures the temperature of the flat test piece (2); The data acquisition device measures the temperature of the first equivalent black body (1-1) based on the first standard infrared thermometer (3) and the second standard infrared thermometer (5). The average temperature is obtained from the temperature of the second equivalent black body (1-2). According to the average temperature and the temperature of the flat plate specimen (2) measured by the infrared thermometer (4) to be detected, the predetermined temperature is obtained. The temperature measurement error when the target temperature is set. 5. The radiation temperature error measuring device according to claim 3, further comprising: a data acquisition device; wherein, When the first heater (6) and the second heater (7) heat the flat test piece (2) to the preset target temperature, the first standard infrared thermometer (3) measures The temperature of the first equivalent black body (1-1), the temperature of the second equivalent black body (1-2) measured by the thermocouple (8), the infrared thermometer to be detected (4) Measure the temperature of the flat test piece (2); The data acquisition device is based on the temperature of the first equivalent black body (1-1) measured by the first standard infrared thermometer (3) and the second temperature measured by the thermocouple (8). The average temperature is obtained from the temperature of the equivalent black body (1-2), and the temperature at the preset target temperature is obtained based on the average temperature and the temperature of the flat specimen (2) measured by the infrared thermometer (4) to be tested. Temperature measurement error. 6. The radiation temperature error measuring device according to claim 1, characterized in that the ratio of the cavity length of the first equivalent black body (1-1) to the cavity opening diameter is not less than 10. 7. The radiation temperature error measuring device according to claim 1, characterized in that the ratio of the cavity length of the second equivalent black body (1-2) to the cavity opening diameter is not less than 10. 8. The radiation temperature error measuring device according to claim 1, characterized in that: the flat specimen (2) is graphite. 9. The radiation temperature error measuring device according to claim 4, characterized in that: the first heater (6) is a quartz lamp, and the second heater (7) is a quartz lamp.