适用于非常规工作环境中热释电型激光能量计的研制

Pyroelectric laser energy meter used in non-regular ambient environment

现有的激光能量计传感器灵敏度系数都与其所处环境温度有关,在-50℃～70℃的温度范围内,灵敏度偏差较大,直接影响测量结果。为了达到消除环境温度的影响,采取在不同环境温度下对热释型能量计的灵敏度进行校准的研究方法。该校准方法与普通激光能量计的校准方法的不同之处在于对热释电型能量计进行校准时,温度由室温扩展到-50℃～70℃的温度范围。利用环境试验箱,每隔10℃固定一个温度点,进行激光能量的测量实验,得到各个温度点所对应的灵敏度修正系数,再借助最小二乘法建立起各个温度点上能量计灵敏度系数同环境温度的函数关系,从而实现了-50℃～70℃的温度范围内激光能量的准确计量。研制能直接工作于非常规工作环境下的热释电型激光能量计,对解决激光能量测量的外场需求有一定现实意义。

The sensor sensitivity of laser energy meter at present is related to the ambient temperature and varies considerably in the range of -50℃ -70℃ which influences the measurements directly. To eliminate the influence of ambient temperature, this paper describes the sensitivity calibration method for pyroelectric energy meter at different ambient temperatures. First of all, the energy meter is put in- to the environment test chamber and the temperature point is set every 10℃ in the range of -50℃-70 ℃. Next the sensitivity correction coefficients at different set temperature points are calculated. The function between the sensitivity correction coefficients gotten above and the ambient temperatures is established and the other sensitivity correction coefficients at different temperature points are deduced by least square method. In real ambient environment, the sensitivity coefficient is calculated according to the function between sensitivity coefficient and ambient temperature to realize accurate measure- ments of laser energy in non-regular environment. The developed pyroelectric laser energy meter which can work in non-regular environment solves the problem of laser energy measurement in field.