A method for calibrating a mirror optical pyrometer

Abstract

The application relates to a mirror optical pyrometer calibration method, which comprises the following steps: adjusting the temperature of an object to a temperature calibration point T b ; measuring the temperature T of the object by using a handheld infrared thermometer; measuring the temperature of the object by using a mirror optical pyrometer; connecting a voltage stabilizer and a voltmeter to the mirror optical pyrometer through a cable; detecting the output voltage value V0 of the mirror optical pyrometer when the object is shielded by using the voltmeter; detecting the output voltage value V s of the mirror optical pyrometer when the object is not shielded; calculating the voltage signal V detected by a detector in the mirror optical pyrometer according to V s -V0; transforming T b , and correspondingly obtaining a plurality of groups of T i , V i ; wherein T i is the temperature of the object measured by the i-th handheld infrared thermometer; V i is the voltage signal detected by the detector in the i-th mirror optical pyrometer; and the minimum lambda, S e is a predetermined value of the radiation wavelength of the object and the system efficiency of the mirror optical pyrometer, wherein n is the number of temperature calibration points.

Description

Technical Field

[0001] This application belongs to the field of calibration technology for mirror optical pyrometers, and specifically relates to a calibration method for mirror optical pyrometers. Background Technology

[0002] In engineering, the following two methods are commonly used to measure the temperature of an object:

[0003] Contact temperature measurement methods use thermocouples, crystals, and temperature-indicating paint to measure the temperature of an object. This method of measuring the temperature of an object will damage the surface of the object and affect the temperature distribution on the object. Furthermore, when measuring the temperature of an object using crystals or temperature-indicating paint, only the highest temperature of the object can be measured, and it is not possible to achieve real-time and accurate measurement of the temperature of the object.

[0004] Non-contact temperature measurement methods mostly utilize reflective optical pyrometers to measure the temperature of objects. This method of temperature measurement does not damage the object's surface, does not affect the temperature distribution on the object, and can achieve real-time temperature measurement. Its temperature measurement principle is as follows:

[0005]

[0006] in,

[0007] M(λ,T) is the radiative exitance of the object;

[0008] ε is the emissivity of the object, and the emissivity of a blackbody is 1;

[0009] λ is the wavelength of radiation emitted by the object;

[0010] C1 and C2 are radiation constants;

[0011] T is the temperature of the object;

[0012] Furthermore, the radiative exitance M(λ,T) of the object is proportional to the radiant energy received by the mirror in the mirror optical pyrometer. This radiant energy is converted into a corresponding voltage signal by the detector in the mirror optical pyrometer. That is, the resulting voltage signal is proportional to the radiative exitance M(λ,T) of the object, as follows:

[0013]

[0014] in,

[0015] V is the voltage signal measured by the detector in the reflector optical pyrometer;

[0016] s e The efficiency of the reflector optical pyrometer system is calculated, which includes the emissivity of the object.

[0017] Then we have:

[0018]

[0019] It can be represented as:

[0020] T=f(λ,S e The temperature of an object is a function of the object's radiation wavelength, the efficiency of the mirror optical pyrometer system, and the voltage signal measured by the detector in the mirror optical pyrometer.

[0021] In practical applications of reflective optical pyrometers to measure the temperature of objects, the radiation wavelength and system efficiency of the object are often preset based on experience, or the predetermined radiation wavelength and system efficiency of the object are used within the reflective optical pyrometer. In this case, the object's temperature can be obtained by measuring the voltage signal from the detector in the reflective optical pyrometer. However, in reality, the radiation wavelength and system efficiency of the object are variable values ​​related to the object's temperature and properties. Presetting the radiation wavelength and system efficiency of the object based solely on experience, or using the predetermined radiation wavelength and system efficiency within the reflective optical pyrometer, makes it difficult to guarantee the accuracy of temperature measurement.

[0022] This application is made in view of the aforementioned technical deficiencies.

[0023] It should be noted that the above background information is only used to assist in understanding the inventive concept and technical solution of this invention, and it does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0024] The purpose of this application is to provide a calibration method for a reflector optical pyrometer to overcome or mitigate at least one of the known technical defects.

[0025] The technical solution of this application is:

[0026] A calibration method for a mirror optical pyrometer includes:

[0027] Adjust the temperature of the object to the temperature calibration point T. b ;

[0028] The temperature T of an object is measured using a handheld infrared thermometer;

[0029] A reflective optical pyrometer is used to measure the temperature of an object. A regulated power supply and a voltmeter are connected to the reflective optical pyrometer via cables. The voltmeter is used to detect the output voltage V0 of the reflective optical pyrometer when the object is blocked, and the output voltage V when the object is not blocked. s , with V s -V0 is used to calculate the voltage signal V measured by the detector in the reflector optical pyrometer;

[0030] Transformation T b This corresponds to multiple sets of T. i V i Among them, T i For the i-th handheld infrared thermometer to measure the temperature of the object; V i Let be the voltage signal measured by the detector in the i-th mirror optical pyrometer;

[0031] Make Minimum λ, S e , where n is the radiation wavelength of the object and the predetermined value of the efficiency of the reflector optical pyrometer system, and n is the number of temperature calibration points.

[0032] According to at least one embodiment of this application, in the above-described calibration method for a reflector optical pyrometer, T b The temperature range is 550℃~1200℃, n=14, and each T b The spaces are evenly spaced.

[0033] According to at least one embodiment of this application, in the above-described method for calibrating a reflective optical pyrometer, the temperature of the object is adjusted to the temperature calibration point T. b Specifically:

[0034] Set the control temperature of the object to T. min +(T max -T min If, under sealed, windless conditions, the output voltage of the voltmeter changes by no more than 1% within thirty minutes, then the object's temperature is considered to be maintained at the temperature calibration point T. b .

[0035] According to at least one embodiment of this application, in the above-described calibration method for a reflector optical pyrometer, when the reflector optical pyrometer measures the temperature of an object, the measuring angle of the reflector in the reflector optical pyrometer is adjusted, and the distance from the reflector to the object is adjusted to be equal to its focal length. The reflector optical pyrometer is then rotated to maximize the voltage value output by the voltmeter, and then the reflector optical pyrometer is fixed on the optical platform with a clamp.

[0036] According to at least one embodiment of this application, in the above-described calibration method for a reflector optical pyrometer,

[0037] in,

[0038] C1 and C2 are radiation constants.

[0039] According to at least one embodiment of this application, in the above-described calibration method for a reflector optical pyrometer, the object is a blackbody furnace, and the handheld infrared thermometer and the reflector optical pyrometer are located within the furnace opening area of ​​the blackbody furnace. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the implementation system of the calibrating method for a pyrometer using a projector provided in this application.

[0041] Figure 2 The embodiments of this application provide λ, S e An uncalibrated mirror optical pyrometer measures the temperature of an object, and based on calibrated λ, S e A schematic diagram comparing the deviation between the temperature measured by the reflective optical pyrometer and the actual temperature of the object.

[0042] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual size of the product. Furthermore, the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Detailed Implementation

[0043] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0044] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0045] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0046] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0047] A calibration method for a mirror optical pyrometer includes:

[0048] Adjust the temperature of the object to the temperature calibration point T. b ;

[0049] When measuring the temperature T of an object with a handheld infrared thermometer, the temperature value fitting coefficient can be calculated based on the handheld infrared thermometer calibration certificate to correct the actual temperature value.

[0050] A reflective optical pyrometer is used to measure the temperature of an object. A regulated power supply and a voltmeter are connected to the reflective optical pyrometer via cables. The voltmeter is used to detect the output voltage V0 of the reflective optical pyrometer when the object is blocked, and the output voltage V when the object is not blocked. s , with V s-V0 is used to calculate the voltage signal V measured by the detector in the reflector optical pyrometer;

[0051] Transformation T b This corresponds to multiple sets of T. i V i Among them, T i For the i-th handheld infrared thermometer to measure the temperature of the object; V i Let be the voltage signal measured by the detector in the i-th mirror optical pyrometer;

[0052] Make Minimum λ, S e , where n is the radiation wavelength of the object and the predetermined value of the efficiency of the reflector optical pyrometer system, and n is the number of temperature calibration points.

[0053] Regarding the calibration method for the reflector optical pyrometer disclosed in the above embodiments, those skilled in the art will understand that it involves multiple temperature calibration points T. b Below, the temperature T of the object is measured using a handheld infrared thermometer, and the temperature of the object is also measured using a reflective optical pyrometer. A regulated power supply and a voltmeter are connected to the reflective optical pyrometer via a cable. The voltmeter is used to detect the output voltage V0 of the reflective optical pyrometer when the object is blocked, and the output voltage V of the reflective optical pyrometer when the object is not blocked. s , with V s -V0 is used to calculate the voltage signal V measured by the detector in the reflector optical pyrometer, which in turn enables... Minimum λ, S e The radiation wavelength of the object and the efficiency of the reflector optical pyrometer system are predetermined values. Based on these values, the radiation wavelength of the object in the reflector optical pyrometer and the efficiency of the reflector optical pyrometer system are preset, and the reflector optical pyrometer is calibrated to ensure the accuracy of the object temperature measurement.

[0054] In some optional embodiments, in the above-described calibration method for a reflector optical pyrometer, T b The temperature range is 550℃~1200℃, which is the applicable temperature range for mirror optics. n=14, each T b The spaces are evenly spaced, with a spacing of 50°.

[0055] In some optional embodiments, in the above-described method for calibrating a reflective optical pyrometer, the temperature of the object is adjusted to the temperature calibration point T. b Specifically:

[0056] Set the control temperature of the object to T. mim +(T max -T minIf, under sealed, windless conditions, the output voltage of the voltmeter changes by no more than 1% within thirty minutes, then the object's temperature is considered to be maintained at the temperature calibration point T. b To avoid relative to the temperature calibration point T b Significant temperature fluctuations.

[0057] In some optional embodiments, in the above-described calibration method for a reflector optical pyrometer, when measuring the temperature of an object using the reflector optical pyrometer, the measuring angle of the reflector in the reflector optical pyrometer is adjusted, and the distance from the reflector to the object is adjusted to be equal to its focal length. The reflector optical pyrometer is then rotated to maximize the voltage value output by the voltmeter. Subsequently, the reflector optical pyrometer is fixed on an optical platform with a clamp to obtain calibration data with good stability and reproducibility.

[0058] In some optional embodiments, in the above-described calibration method for a reflector optical pyrometer,

[0059]

[0060] in,

[0061] C1 and C2 are radiation constants.

[0062] In some optional embodiments, in the above-described method for calibrating a reflector optical pyrometer, the object is a blackbody furnace, and the handheld infrared thermometer and the reflector optical pyrometer are located within the furnace opening area of ​​the blackbody furnace.

[0063] The above-described embodiment discloses a method for calibrating a mirror optical pyrometer, which can utilize methods such as... Figure 1 The system implementation shown, in a specific embodiment, uses λ and S e An uncalibrated mirror optical pyrometer measures the temperature of an object, and based on calibrated λ, S e Calculate the deviation between the temperature measured by the reflecting optical pyrometer and the actual temperature of the object. Figure 2 As shown, it can be seen from λ and S e An uncalibrated reflective optical pyrometer measures the temperature of an object with a significant deviation from the object's actual temperature, based on calibrated λ and S. e The deviation between the temperature measured by the reflective optical pyrometer and the actual temperature of the object is relatively small, i.e., λ and S... e The calibrated reflective optical pyrometer will have a small deviation from the actual temperature of the object, within ±2℃, which can meet the requirements of engineering applications.

[0064] The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] The technical solution of this application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A calibration method for a mirror optical pyrometer, characterized in that, include: Adjust the object's temperature to the temperature calibration point. ; The temperature T of an object is measured using a handheld infrared thermometer; The temperature of an object is measured using a reflective optical pyrometer. A regulated power supply and a voltmeter are connected to the reflective optical pyrometer via cables. The voltmeter is used to detect the output voltage of the reflective optical pyrometer when the object is blocked. And the output voltage value of the optical pyrometer for detecting the reflector when the object is not blocked. ,by - The voltage signal measured by the detector in the reflector optical pyrometer was calculated. ; Transformation This results in multiple sets. , ;in, Measure the temperature of the object using the i-th handheld infrared thermometer; Let be the voltage signal measured by the detector in the i-th mirror optical pyrometer; Make smallest , where is the radiation wavelength of the object and the predetermined value of the efficiency of the reflector optical pyrometer system, where The number of temperature calibration points; ； in, The radiation constant; For intermediate calculation variables.

2. The calibration method for a reflector optical pyrometer according to claim 1, characterized in that, The temperature range is 550℃~1200℃. ,each The spaces are evenly spaced.

3. The calibration method for the optical pyrometer of the reflector according to claim 1, characterized in that, When measuring the temperature of an object using a reflective optical pyrometer, adjust the measuring angle of the reflector in the reflective optical pyrometer, and adjust the distance between the reflector and the object to be equal to its focal length. Then, rotate the reflective optical pyrometer to maximize the voltage output of the voltmeter. Finally, use a clamp to fix the reflective optical pyrometer on the optical platform.

4. The calibration method for a reflector optical pyrometer according to claim 1, characterized in that, The object is a blackbody furnace, and a handheld infrared thermometer and a reflective optical pyrometer are located within the furnace opening area.

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