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CN-121994363-A - Photoelectric pyrometer nonlinear automatic measurement device and method based on variable-temperature blackbody radiation source

CN121994363ACN 121994363 ACN121994363 ACN 121994363ACN-121994363-A

Abstract

The invention discloses a nonlinear automatic measurement device and method for a photoelectric pyrometer based on a variable-temperature blackbody radiation source, and belongs to the technical field of radiation temperature measurement. The device comprises a variable-temperature blackbody radiation source, an adjustable aperture module, a controller and automatic acquisition software, wherein the adjustable aperture module consists of a fixed round aperture diaphragm plate and a rotatable aperture circular plate integrated with four aperture forms of closing, right half-opening, full-opening and left half-opening, the aperture circular plate is driven by a motor to precisely rotate and position, the four aperture states are aligned in sequence, a thermometer to be measured automatically acquires dark current, half-path radiation energy and whole-path radiation energy signals, nonlinearity and accumulated nonlinearity are calculated based on the signals, and the nonlinearity and the accumulated nonlinearity are converted into temperature errors for indication correction. The invention realizes full-automatic and high-consistency acquisition of wide-temperature-range nonlinear measurement by a single-light-source double-light-path structure, and remarkably improves the stability, repeatability and accuracy of measurement.

Inventors

  • LU XIAOFENG
  • XIONG YUTING
  • ZHANG TINGTING
  • AN BAOLIN

Assignees

  • 中国计量科学研究院
  • 浙江省质量科学研究院

Dates

Publication Date
20260508
Application Date
20260227

Claims (10)

  1. 1. An automatic nonlinear measurement device of photoelectric pyrometer based on a variable-temperature blackbody radiation source is characterized by comprising: a variable-temperature blackbody radiation source (4) and a bracket for mounting a photoelectric pyrometer (6) to be measured; The adjustable diaphragm module (1) is arranged on a light path between a radiation outlet of the variable-temperature blackbody radiation source (4) and a receiving end of the photoelectric pyrometer (6) to be measured; The controller (2) is electrically connected with the adjustable aperture module (1); the adjustable aperture module (1) comprises round aperture diaphragm plates (1-2) and rotatable diaphragm circular plates (1-1) which are arranged in parallel; The round hole diaphragm plate (1-2) is provided with round holes (1-3); The rotatable diaphragm circular plate (1-1) is integrated with four diaphragm modes of a closed state, a right half-open state, a full-open state and a left half-open state; the rotatable diaphragm circular plate (1-1) is connected with a motor through a rotating shaft, and the motor is electrically connected with the controller (2) and is used for driving the rotatable diaphragm circular plate (1-1) to rotate so that one of the four diaphragm forms is selectively opposite to the rear of the circular hole (1-3).
  2. 2. The device according to claim 1, characterized in that the half-open area of the right half-open state diaphragm and the half-open area of the left half-open state diaphragm on the rotatable diaphragm disc (1-1) are identical.
  3. 3. The device according to claim 1, characterized in that the rotation angle of the rotatable diaphragm disc (1-1) is controlled by the controller (2) to stop at four positioning angles of 0 °, 90 °, 180 °, 270 °, respectively, the closed state, the right half-open state, the full-open state and the left half-open state being aligned with the circular aperture (1-3), respectively.
  4. 4. The device according to claim 1, further comprising automatic acquisition software (3), wherein the automatic acquisition software (3) is installed in a computer, is in communication connection with the controller (2) and the photoelectric pyrometer (6) to be measured, and is used for controlling the rotation sequence of the rotatable diaphragm circular plate (1-1) and automatically acquiring the electric signals output by the photoelectric pyrometer (6) to be measured.
  5. 5. The device according to claim 4, characterized in that the automatic acquisition software (3) is configured to control the rotatable diaphragm disc (1-1) to rotate and measure in a preset cyclic sequence of "closed state-right half-open state-full-open state-left half-open state-closed state-left half-open state-full-open state-right half-open state-closed state".
  6. 6. The arrangement according to claim 1, characterized in that the outer surface of the adjustable aperture module (1) is coated with a black body paint of low reflectivity.
  7. 7. Device according to claim 1, characterized in that the outer diameters of the four diaphragm forms on the rotatable diaphragm disc (1-1) are the same as the diameter of the circular hole (1-3), and that the axis of rotation of the rotatable diaphragm disc (1-1) coincides with the central axis of the circular hole (1-3).
  8. 8. An arrangement according to claim 1, characterized in that the arrangement further comprises a movable platform (5), the adjustable aperture module (1) being mounted on the movable platform (5), the movable platform (5) being adapted to adjust the position of the adjustable aperture module (1) in a direction perpendicular to the optical path.
  9. 9. A method for nonlinear automatic measurement of an electro-optical pyrometer based on a variable temperature blackbody radiation source, characterized in that it comprises the following steps, based on the device according to any one of claims 1 to 8: a variable-temperature blackbody radiation source (4) is used as a single radiation light source; The radiation energy is regulated by using an adjustable aperture module (1) arranged between the variable-temperature blackbody radiation source (4) and the photoelectric pyrometer (6) to be measured, wherein the adjustable aperture module (1) comprises a fixed round aperture diaphragm plate (1-2) and a rotatable diaphragm circular plate (1-1) arranged in parallel with the fixed round aperture diaphragm plate; The rotatable diaphragm circular plate (1-1) is driven to rotate through a motor, so that four diaphragm forms on the rotatable diaphragm circular plate are sequentially opposite to the rear of a circular hole (1-3) positioned on the circular hole diaphragm plate (1-2), and the four diaphragm forms comprise a closed state, a right half-open state, a full-open state and a left half-open state; Controlling a motor to be positioned according to a preset angle, so that the photoelectric pyrometer (6) to be detected sequentially obtains a dark current signal, a first half-range radiant energy signal, a whole-range radiant energy signal and a second half-range radiant energy signal; calculating a nonlinear value of the photoelectric pyrometer (6) to be measured at a current temperature point based on the obtained dark current signal, the first half-range radiant energy signal, the full-range radiant energy signal and the second half-range radiant energy signal; And determining accumulated nonlinearity according to the calculated nonlinearity value, and converting the accumulated nonlinearity into an introduced temperature error value for correcting the indication error of the photoelectric pyrometer to be measured.
  10. 10. The method of claim 9, wherein the first half-path radiant energy signal is equalized with the second half-path radiant energy signal by adjusting the position of the rotatable diaphragm disc during acquisition of the signal.

Description

Photoelectric pyrometer nonlinear automatic measurement device and method based on variable-temperature blackbody radiation source Technical Field The invention belongs to the technical field of radiation temperature measurement, and particularly relates to a nonlinear automatic measurement device and method of a photoelectric pyrometer based on a variable-temperature blackbody radiation source. Background The photoelectric pyrometer is used as a key sensor in high-temperature measurement, is widely applied to the fields of high-temperature industry and metering verification such as metallurgy, aerospace, material processing and the like by detecting the target radiation intensity and converting the target radiation intensity into a temperature value based on the Planck law, and realizes non-contact accurate temperature measurement. In order to evaluate and correct nonlinear errors caused by factors such as response characteristics of a high Wen Duanyin photoelectric element, temperature drift of a circuit and a filtering system, the prior art mainly adopts the following measuring method that firstly, a fixed point blackbody is used for combining with a standard light source, nonlinear data is obtained through multistage radiation comparison, secondly, a multi-light source switching structure is adopted to obtain different radiation intensities, and thirdly, radiation energy is adjusted through a light path beam splitter. The method can realize the measurement of nonlinear characteristics to a certain extent and provide basis for the accuracy evaluation of the instrument. However, the existing method still has obvious defects that firstly, the device is huge in size and complicated in construction and debugging process due to a multi-light source or complex light path structure, radiation stability and light path consistency among different light sources are difficult to guarantee, repeatability and reliability of nonlinear measurement are affected, secondly, the device is limited by a light source temperature area range, a full temperature measurement range (for example, 200-3000 ℃) of a photoelectric pyrometer cannot be covered, the light sources are required to be replaced or a system is required to be rearranged in the measurement process, operation is inconvenient, extra uncertainty is introduced, and furthermore, the existing device is low in automation degree due to the fact that diaphragms are manually replaced or light paths are adjusted, and continuous, automatic switching and data acquisition of radiation energy in the full temperature area are difficult to realize, so that the efficiency and consistency of nonlinear measurement are restricted. Therefore, a nonlinear measurement device with consistent light source, stable light path and automatic switching function in a wide temperature range is needed to improve the accuracy, repeatability and traceability of nonlinear calibration. Disclosure of Invention In order to solve the technical problems, the invention provides a nonlinear automatic measurement device of an optoelectronic pyrometer based on a variable-temperature blackbody radiation source, which aims to solve the problems in the prior art. To achieve the above object, in a first aspect, the present invention provides a nonlinear automatic measurement apparatus for an electro-optical pyrometer based on a variable temperature blackbody radiation source, comprising: the variable-temperature blackbody radiation source is used for installing a bracket of the photoelectric pyrometer to be measured; the adjustable diaphragm module is arranged on a light path between a radiation outlet of the variable-temperature blackbody radiation source and a receiving end of the photoelectric pyrometer to be measured; the controller is electrically connected with the adjustable diaphragm module; The adjustable aperture module comprises a round aperture diaphragm plate and a rotatable aperture diaphragm plate which are arranged in parallel; the round hole diaphragm plate is provided with round holes; The rotatable diaphragm circular plate is integrated with four diaphragm modes of a closed state, a right half-open state, a full-open state and a left half-open state; The rotatable diaphragm circular plate is connected with a motor through a rotating shaft, and the motor is electrically connected with the controller and used for driving the rotatable diaphragm circular plate to rotate, so that one of the four diaphragm forms is selectively opposite to the rear of the round hole. Preferably, the half-open area of the right half-open state diaphragm and the half-open area of the left half-open state diaphragm on the rotatable diaphragm disk are the same. Preferably, the rotation angle of the rotatable diaphragm disc is controlled by the controller to be stopped at four positioning angles of 0 °, 90 °, 180 °, 270 °, respectively, and the closed state, the right half-open state, the full-open state, and the left h