精密红外辐射计测量模块研究

Research on measurement module of precision infrared radiometer

摘要: 红外辐射计用于红外热像仪测试设备的校准。介绍了一种用于红外辐射计的测量模块及方法。设计了采样保持的测量方案，通过参考信号生成采样脉冲，并将采样点设置在每个信号周期的1/4相位处，能显著提高微弱信号的测量能力。对于35 ℃的黑体辐射信号，通过与现有方案的对比实验，测量信号强度可提高57.6%；在红外热像仪测试设备背景温度为22 ℃条件下，通过与现有仪器的对比测试，测量信号精度可提升50%以上。

Abstract: The infrared radiometer is generally used for the calibration of the infrared thermal imager testing equipment. A measurement module and method for infrared radiometer were introduced. A measurement scheme of sample and hold was designed, the sampling pulse was generated from the reference signal, and the sampling point was set at the 1/4 phase of each signal period, which could significantly improve the measurement ability of weak signals. For the black-body radiation signal at 35 ℃, the measured signal strength could be increased by 57.6% by comparing with the existing scheme. Under the condition that the background temperature of the infrared thermal imager testing equipment was 22 ℃, the measurement signal accuracy could be improved by more than 50% through the comparison test with the existing instruments.