Radiometric calibration method for low-temperature measurement of thermal infrared imager

An infrared thermal imager and radiometric calibration technology, which is applied in the fields of temperature inversion and radiometric calibration, can solve problems such as insufficient temperature measurement range of low-temperature targets, prevent the atmosphere from affecting weak low-temperature target radiation signals, improve accuracy, and improve The effect of temperature measurement accuracy

Inactive Publication Date: 2012-12-12
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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Problems solved by technology

[0006] The invention solves the problem of insufficient temperature measurement range of low-temperature targets of existing infrared thermal imaging cameras through the low-t

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  • Radiometric calibration method for low-temperature measurement of thermal infrared imager
  • Radiometric calibration method for low-temperature measurement of thermal infrared imager
  • Radiometric calibration method for low-temperature measurement of thermal infrared imager

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Embodiment Construction

[0026] The working process of the present invention will be further described below in conjunction with accompanying drawings and examples.

[0027] The invention firstly studies and deeply analyzes the low-temperature detection ability of the existing infrared thermal imager, and demonstrates that the infrared focal plane detector has the detection ability of low-temperature target radiation. The present invention establishes a physical model of infrared thermal imager for infrared imaging and temperature measurement in a vacuum and low temperature environment through Planck's thermal radiation law. The radiation model consists of a space target radiation model, a background fluctuation noise model, and an infrared thermal imager system circuit. Composed of noise and thermal noise models, the energy detection capability of the infrared thermal imaging temperature measurement system in a vacuum and low temperature environment is theoretically analyzed, and the minimum detectabl...

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Abstract

The invention belongs to the technical field of photoelectric detection and discloses a radiometric calibration method for low-temperature measurement of a thermal infrared imager, which is capable of extending a low temperature measurement range of the current thermal infrared imager to 100 DEG C below zero and also increasing temperature measurement precision to be within 1 DEG C. In order to increase precision of low-temperature radiometric calibration, the method is characterized that radiometric calibration data are collected in a vacuum and low temperature environment. The method comprises the steps of: heating a radiometric calibration plate (1) through a thin film heating plate in the vacuum and low-temperature environment, leading the radiometric calibration plate (1) to reach a calibration temperature and to enter thermal equilibrium, collecting 14-bit original grays of all radiometric calibration regions at calibration temperatures in a range from 100 DEG C below zero to 0 DEG C by the thermal infrared imager; processing radiometric calibration data, obtaining radiometric calibration gray through statistics; and finally, fitting an inversion function of infrared thermal imaging temperature according to the radiometric calibration gray and temperature. The method disclosed by the invention has the advantages that low temperature measurement range of the thermal infrared imager is extended effectively and temperature measurement precision of low-temperature targets is improved through reduction of radiometric calibration error.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and relates to a radiation calibration method and a temperature inversion method when performing temperature measurement based on infrared thermal imaging to a low-temperature background (-100°C to 0°C) and a target. Background technique [0002] Infrared thermal imaging temperature measurement is widely used in national defense security, scientific research, industrial nondestructive testing, electric power, and building heat leakage detection due to its non-contact measurement, fast response, intuitive display of temperature field distribution, and suitable for large area array operations. , medical pathological testing and other fields. Infrared thermal imaging cameras have high responsiveness and good linearity to high-temperature targets, and the temperature measurement technology is relatively mature. [0003] As infrared thermal imaging temperature measurement continues to...

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Application Information

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IPC IPC(8): G01J5/00
Inventor 张罗莎白廷柱裴一飞陶涛郑海晶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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