摘要
为提高单波段红外热像仪测温的准确性,根据红外热像仪测温的原理和计算公式,提出了红外热像仪测温的变谱法。该方法通过在有限的波段内对发射率和反射率进行线性化处理,采取在不同的波段下测量的方法,从而构造不同的测温方程,然后通过求解方程组得到物体的表面温度。对于朗伯体材料的测温,需要构造3个测温方程进行求解;对于灰体材料的测温,可以通过在两个波段下进行测温,然后用建立的方程进行迭代求解。该方法可以通过在红外热像仪前加设滤光片和用不同波段的热像仪进行测量这两种方法来进行技术实现。仿真结果表明,该方法可以较准确地测量物体的表面温度,误差很小,可以在无需知道被测物体表面发射率的情况下得到物体的表面温度,从而减少了红外测温中由于发射率测量不准造成的误差。
To improve the accuracy of temperature measurement of single-band infrared thermal imager, based on the principles and formulas of temperature measurement using infrared imager, altering spectrum method in the infrared temperature measurement was derived. In the method, the emissivity and reflectivity was considered as linear in limited wavelength ranges. Through measurements at different wavelengths, several formulas could be constructed and the surface temperature of measured object could be obtained by solving the equations. For the temperature measurement of Lambertian, three temperature equations should be constructed. For objects close to gray body, the temperature measurement should be carried out in two different bands and the temperature could be obtained by solving the iterative equation. This method could be achieved technologically by two means： setting filters in front of infrared camera, or using infrared imagers with different bands. Simulation results show that the surface temperature of measured object could be obtained with high accuracy through the method, and its error is very small. Through this method, the temperature of measured object could be obtained without knowing its emissivity, so the error caused by the measurement of the emissivity of measured object could be reduced.
出处
《红外与激光工程》
EI
CSCD
北大核心
2012年第6期1432-1437,共6页
Infrared and Laser Engineering
基金
国防预研基金(1010502020202)
关键词
单波段红外热像仪
红外测温
发射率
变谱法
single-band infrared thermal imager
infrared temperature measurement
emissivity
altering spectrum method
