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Site target emissivity measuring system and method based on environmental radiation change

A technology of environmental radiation and measurement methods, applied in the field of on-site target emissivity measurement, can solve problems such as the meaninglessness of target emissivity measurement, and achieve the effects of wide application range, high measurement accuracy and high accuracy

Inactive Publication Date: 2015-01-07
NANJING UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct measurement method needs to be carried out in the absence of atmosphere, no environmental influence and the known temperature of the object itself, which is only suitable for laboratory measurement
This method of measurement is meaningless for target emissivity measurements in field sites

Method used

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  • Site target emissivity measuring system and method based on environmental radiation change
  • Site target emissivity measuring system and method based on environmental radiation change
  • Site target emissivity measuring system and method based on environmental radiation change

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Select ceramics, white paper and plastic plate as the measurement target, put the target and the black body under the same conditions and temperature, the distance between the black body and the target and the detector is 0.5m, repeat the measurement 5 times for each material, and take the average value. The test results are shown in Table 2.

[0067] Table 2 Material emissivity measurement values

[0068]

[0069] In order to more accurately evaluate the degree of uncertainty of the measurement results, the standard uncertainties of the three groups of measurement values ​​are calculated respectively, using the formula (18), which reflects the degree of dispersion of the value relative to the average value. The uncertainty is less than 2%, which shows that the measurement stability of this method is better.

[0070] S = Σ ( x ...

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Abstract

The invention discloses a site target emissivity measuring system and method based on the environmental radiation change. The system comprises a target, a spectroscope and an infrared detector, wherein the target, the spectroscope and the infrared detector are sequentially arranged in the optical path direction and located on the same optical axis. The system further comprises a black body and a collecting lens. Radiation light of the black body converges on the spectroscope through the collecting lens, is reflected to the target through the spectroscope, acts on the target, then is reflected to the spectroscope and reaches the detector. The method includes the steps that firstly, radiometric calibration is conducted on the infrared detector; a system response function is established with the radiation of the black body serving as the standard; an output response value V1 of the infrared detector is measured under the condition of the environmental radiation intensity Vs1; an output response value V2 of the infrared detector is measured when the condition is changed into the environmental radiation intensity Vs2; according to the output response values measured under the two different radiation intensity conditions of the infrared detector, the reflectivity and the emissivity of the target are calculated. According to the system and method, necessary parameters are provided for infrared radiation non-contact accurate temperature measurement.

Description

technical field [0001] The invention belongs to the technical field of field target emissivity measurement, in particular to a field target emissivity measurement system and method based on environmental radiation changes. Background technique [0002] The radiometric measurement of the true temperature of the target surface is an important task in many scientific researches, especially the non-contact accurate measurement of the true surface temperature is more difficult and critical. Infrared imaging temperature measurement technology is non-contact (will not destroy the temperature field of the measured object), intuitive, high sensitivity (can distinguish the temperature difference of 0.01 ℃), fast (measure the target temperature within a few milliseconds), wide temperature measurement range ( From -170°C to above 3200°C), the detection distance can be near or far, and it can realize night vision, safety and other advantages. It is not only widely used in civil fields su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/10G01J5/08
Inventor 屈惠明吉庆陈钱顾国华张立广王坤张一帆于雪莲李加基
Owner NANJING UNIV OF SCI & TECH
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