Precision calibrating method of infrared thermometer with wide temperature range

A technology of infrared thermometer and calibration method, which is applied in radiation pyrometry, instruments, measuring devices, etc., can solve the problems of inconvenient data collection, exceeding accuracy requirements, and large test errors.

Inactive Publication Date: 2015-05-13
TIANJIN UNIV
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Problems solved by technology

[0003] Although the current non-contact infrared temperature thermometer can measure high and low temperatures in the environment of –40°C to +70°C, and the test results are accurate, its response speed is slow, and the response time can even be as long as tens of seconds. On-site data collection brings great inconvenience
At present, the working temperature range (0℃~50℃) of commercialized ordinary non-contact infrared temperature thermometers is not exactly the same as the test te

Method used

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  • Precision calibrating method of infrared thermometer with wide temperature range
  • Precision calibrating method of infrared thermometer with wide temperature range
  • Precision calibrating method of infrared thermometer with wide temperature range

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Embodiment Construction

[0032] figure 2 It is the temperature calibration flow chart of the infrared thermometer. In the figure, x is the real temperature of the object; y is the initial temperature value obtained after the microcontroller reads the sensor signal, x' is the calibrated temperature, and y' is the calibrated temperature displayed on the LCD. temperature value. When calibrating the infrared thermometer, determine its temperature range according to the size of y, and judge whether y needs to be corrected. If not, then x'=y, and the displayed temperature y' is equal to the corrected temperature x'. That is, y'=x'=y; otherwise, substitute y into the corresponding correction function to obtain a calibration value x' that is closer to the real temperature than y, that is, the corrected display temperature The values ​​of A and B are determined by the temperature range of y, and the corrected displayed temperature error is ±1°C. Therefore, after correction by the least square method, the m...

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Abstract

The invention discloses a precision calibrating method of an infrared thermometer with a wide temperature range; the method comprises the steps: firstly, acquiring initial temperature values measured by the infrared thermometer according to experiments and drawing into a discrete point drawing; performing segmented fitting for the initial temperature values acquired by the infrared thermometer and a true temperature curve by means of a least square method, and acquiring a correction coefficient of each temperature interval; and finally, correcting the initial temperature values according to the corresponding correction coefficients of the initial temperature values, acquired by the infrared thermometer, in the temperature intervals and acquiring one temperature value which is closer to the actual temperature than the initial temperature values. The measuring precision of the infrared thermometer is improved and the measuring error is reduced.

Description

technical field [0001] The invention relates to an infrared thermometer, in particular to an accuracy calibration method for an infrared thermometer with a wide temperature range of -40°C to +70°C, so as to meet the requirement of measurement accuracy of ±1°C. Background technique [0002] Infrared thermometer has the characteristics of short response time, wide measurement temperature range and high measurement accuracy, and is widely used in the field of object surface temperature measurement. The change of temperature will cause great stress inside and cause material fatigue, which will affect the service life of the material. Accurately testing the change of temperature on site is of great significance for the study of service life and material aging and degradation performance. [0003] Although the current non-contact infrared temperature thermometer can measure high and low temperatures in the environment of –40°C to +70°C, and the test results are accurate, its respo...

Claims

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Application Information

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IPC IPC(8): G01J5/00
Inventor 王秀宇李晨光马金鑫程强张浩马小品张平
Owner TIANJIN UNIV
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