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Method for improving temperature measurement precision of thermal infrared imager

An infrared thermal imager and temperature measurement accuracy technology, applied in radiation pyrometry, instruments, measurement devices, etc., can solve problems such as limitations and low temperature measurement accuracy, and achieve the goal of increasing temperature measurement preprocessing and improving temperature measurement accuracy Effect

Inactive Publication Date: 2018-02-27
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

The traditional fitting curve blackbody calibration temperature measurement method considers the influence of the target background and atmospheric radiation, and the measured data radiation temperature is not the real temperature, and the temperature measurement accuracy is low. big limit

Method used

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  • Method for improving temperature measurement precision of thermal infrared imager
  • Method for improving temperature measurement precision of thermal infrared imager

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Embodiment Construction

[0020] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0021] The principle block diagram of the infrared temperature measurement system of the embodiment of the present invention is shown in the appendix figure 2 , including an optical system, an infrared detector and a signal processing module; the infrared detector obtains the infrared image of the target through the optical system, and the infrared image obtains the real temperature of the target object through the data processing process of the signal processing module. Specific steps are as follows:

[0022] Step 1: Carry out blackbody calibration, and use the difference lookup table method for blackbody calibration:

[0023] Before the thermal imager leaves the factory, use a high-precision black body to calibrate it. The calibration steps are as follows:

[0024] (l) Set the temperature of the black body temperature source as the reference temperature T0, ...

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Abstract

The invention relates to a method for improving the temperature measurement precision of a thermal infrared imager. The method comprises the steps that a high-precision black body is adopted to calibrate the thermal infrared imager, wherein the calibration aims to test the whole system to find the relation between the temperature of the black body and the gray value of an image and describe the relation with a lookup table; the radiation temperature of an object is calculated by using the gray value of the image; the radiation temperature is converted into the real temperature. Compared with atraditional fitted curve black body calibration temperature measurement method, in the method, the black body calibration is conducted by using the difference value lookup table, the temperature measurement pretreatment is adde, the conversion of the radiation temperature is added, and the real temperature value of the target object is obtained; meanwhile, the influences of target reflected radiation, backgrounds and atmospheric radiation on the temperature measurement are reduced, and the temperature measurement precision is improved. The method is suitable for the application field where temperature measurement and detection are conducted by using an infrared detector in electrical equipment detection, fire situation detection, petroleum pipeline detection and the like.

Description

technical field [0001] The invention belongs to the signal control and processing technology, relates to a method for measuring the temperature of a radiation target by using an infrared detector, in particular to an infrared temperature measurement method for fault diagnosis of substation equipment. Background technique [0002] Substation power equipment is under high-voltage, high-temperature, and high-load working conditions outdoors for a long time, so it is very prone to defects, deterioration, and even accidents. Therefore, it is of great significance to perform status detection and fault diagnosis of electrical equipment at regular intervals. Power equipment is developing towards the trend of oil-free, miniaturized, closed and insulated. Due to the closed structure and insulating materials of new power equipment, many traditional detection methods such as visual inspection and ear listening are no longer applicable. On-line monitoring and detection technology of ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/00G01J5/06
CPCG01J5/00G01J5/06G01J5/80
Inventor 彭涛刘彤陈国强周游
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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