Temperature measurement system and method based on pixelated dual-band narrow-band optical filter array

Abstract

The invention discloses a temperature measurement system and method based on a pixelated dual-band narrow-band optical filter array, and relates to the technical field of infrared light side mechanics. The temperature measurement system comprises a dual-band array image acquisition device and a calculation device; in the calibration stage, the dual-band array image acquisition device is used for acquiring a gray scale array image of dual-band radiation light in a calibration area of the high-temperature calibration device, and the calculation device is used for acquiring a correction parametermatrix and a system response parameter matrix; in a measurement stage, the dual-band array image acquisition device is used for acquiring a gray scale array image of dual-band radiation light of an object to be measured, and the calculation device is used for correcting the gray scale array image of the object to be measured, extracting data and calculating a temperature field of the object to bemeasured. According to the invention, the common influence caused by the quality difference of each filtering unit, the lens distortion, the chromatic aberration, the integration error of the filtering units and the pixels and the like is eliminated in the temperature measurement system and the temperature measurement method for the first time, and the precision of the temperature measurement system and method is improved.

Description

technical field [0001] The present invention relates to the technical field of infrared light side mechanics, and more specifically, relates to a temperature measurement system and method based on a pixelated dual-band narrow-band filter array. Background technique [0002] Measuring the surface temperature field of materials is of great significance in aerospace, machinery manufacturing, nuclear energy and other fields. Therefore, having advanced temperature measurement methods is an important condition for promoting the development of aerospace, machinery manufacturing, and nuclear energy fields. important guarantee. [0003] At present, due to the special high-temperature working conditions, the traditional contact temperature measurement not only has a slow response speed and cannot measure the temperature of the whole field, but may also cause damage to the temperature field. Compared with traditional temperature measurement methods, non-contact temperature measurement...

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Problems solved by technology

Among them, the colorimetric temperature measurement device, one of the radiation temperature measurement methods, has been widely used in recent years. For example, in the Chinese patent with the publication number CN108279071A, a full-field molten pool temperature based on the colorimetric temperature measurement method is disclosed. The field detection system is used to monitor the change of the temperature field of the molten pool in real time. The patent adds a synchronous trigger function to the device, and adds a blackbody furnace calibration to the data processing. However, the dual-camera measurement optical path designed by the patent requires two On the one hand, the cost is high, the whole device is large, and the control and debugging are more complicated. On the other hand, it is difficult to ensure that the two cameras are triggered at the same time when the temperature field is measured by two cameras. The data collected by the two cameras It is difficult to match the positions of the images at the same time. This will be a great choice for high-speed and ultra-high-speed measurement fields such as high-speed rotating turbine blades in engines in aerospace, automotive, and ship engineering, and rapidly changing metal molten pools in additive manufacturing industries. There will be a large measurement error

In the Chinese patent with the publication number CN108871585A, a temperature field measurement system and method based on a single camera is disclosed. The patent uses a high-speed camera for temperature measurement, which meets the requirements of high-speed temperature measurement under special working conditions. In addition, the patent design The spectroscopic system thus realizes single-camera temperature measurement, but the temperature measurement method designed in this patent has a complex optical path, a small measurement field of view, and a large structure that is not easy to integrate

In the Chinese patent with the publication number CN208866390U, a colorimetric temperature measurement device for the melt pool in the laser selective melting process is disclosed. The patent uses a color high-speed camera to obtain the three-color information of the detection object, and two of the monochrome values ​​are used for calculation. The real-time temperature is more concise and requires less devices, but the patent uses RGB three-color camera for temperature measurement, and the use of visible light is easily affected by the color of the object to be measured and the ambient light, that is, the brightness of the image collected by the camera is not high. It is entirely the radiance of the object, which brings errors to the calculation results; at the same time, because the color camera uses red, green, and blue three-color visible light band filters with fixed spectral response values, but according to the temperature radiation curve, in the melt pool evolution In the ultra-high temperature range, the peak band of radiated light is in the near-infrared band, coupled with the frequency mixing phenomenon of the color camera, so the accuracy of the temperature measurement result of the color camera is not high

In addition, thermal imaging cameras are one of the more mature technologies for radiation temperature measurement, but the usual temperature measurement range is below 1500 °C, and it is impossible to measure ultra-high temperature temperature fields, and the spatial resolution and spatial resolution of general infrared thermal imaging cameras For some high-precision, high-resolution, high-speed measurement requirements, ordinary infrared thermal imaging cameras are often difficult to meet

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