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A method and device for infrared temperature drift correction based on Kalman filter

A Kalman filter and temperature drift correction technology, applied in the field of infrared temperature measurement, can solve problems such as affecting temperature measurement efficiency, and achieve the effect of improving temperature measurement efficiency and eliminating temperature jitter

Active Publication Date: 2021-07-23
WUHAN GUIDE SENSMART TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compensation parameters need to be preset at the beginning of startup. The selection of parameters needs to be set according to the temperature rise curve of the whole machine and the response rate of the detector. Experiments are needed to repeatedly verify and adjust, which affects the temperature measurement efficiency.

Method used

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  • A method and device for infrared temperature drift correction based on Kalman filter
  • A method and device for infrared temperature drift correction based on Kalman filter
  • A method and device for infrared temperature drift correction based on Kalman filter

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Embodiment 1

[0049] Such as figure 1 , the invention discloses a Kalman filter-based infrared temperature drift correction method, comprising:

[0050] S100. Convert the collected target thermal radiation signal into a corresponding electrical signal, and obtain a corresponding digital real-time response value through voltage amplification and AD conversion of the electrical signal;

[0051] Specifically, the step S100 includes: selecting the center point of the infrared image as the calibration point, obtaining the DC digitized component x16 value of the target radiation from the center point of the infrared image, and denoting it as g1; The digitized component x16 value at the point is recorded as g0, and the digitized real-time response s is obtained according to the difference between g1 and g0.

[0052] S200. Calculate the compensated response value according to the increment between the two shutters and the increment of the lens barrel temperature; specifically, S200 specifically incl...

Embodiment 2

[0082] The embodiment of the present invention discloses an infrared temperature drift correction device based on a Kalman filter, such as Figure 4 , including a data acquisition unit 1, an iterative temperature drift compensation unit 2, a temperature calculation unit 3, and a Kalman temperature drift correction unit 4;

[0083] The data acquisition unit 1 collects the target thermal radiation signal and converts it into a corresponding electrical signal, and the electrical signal is amplified by voltage and converted by AD to obtain a corresponding digital real-time response value;

[0084] Specifically, the center point of the infrared image is selected as the calibration point, and the x16 value of the DC digitized component of the target radiation is obtained from the center point of the infrared image, which is recorded as g1; The x16 value of the component is recorded as g0, and the digital real-time response value s is obtained according to the difference between g1 a...

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Abstract

The invention discloses a Kalman filter-based infrared temperature drift correction method, which converts the collected target thermal radiation signal into a corresponding digital real-time response value; calculates the compensation according to the increment between two shutters and the increment of the lens barrel temperature Calculate the temperature according to the shutter temperature, the compensated response value and the calibration curve to obtain the temperature value of the calibration point; perform temperature drift correction on the temperature value of the calibration point according to the Kalman filter algorithm to obtain the optimal temperature Drift correction value. The invention introduces the Kalman filter algorithm to further correct the predicted noise and compensated noise after iterative temperature compensation, and solves the problem of reduced measurement accuracy caused by the uneven change rate of the focal plane in the prior art due to the fact that the detector is just powered on. problem, and the Kalman filter algorithm of the present invention can update the temperature compensation coefficient in real time according to the last compensation coefficient, which has a positive effect on eliminating temperature jitter and suppressing the temperature drift compensation degree from returning to the real temperature.

Description

technical field [0001] The invention relates to the technical field of infrared temperature measurement, in particular to a method and device for correcting infrared temperature drift based on a Kalman filter. Background technique [0002] Infrared temperature measurement technology is widely used in civilian fields due to its advantages of wide temperature measurement range, no change in the temperature field of the measured object, and long-distance non-contact temperature measurement. Temperature drift is a key factor affecting the accuracy of infrared temperature measurement. It is mainly due to the change of the response rate caused by the drift of the focal plane temperature, which affects the final temperature measurement result. The temperature drift correction mechanism is very important, especially for infrared detectors without semiconductor coolers. The current temperature drift correction mechanism is commonly used iterative compensation method. The iterative c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00
CPCG01J5/00G01J2005/0077G01J5/80
Inventor 田鹏崔昌浩黄晟王鹏周汉林李林
Owner WUHAN GUIDE SENSMART TECH CO LTD
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