雪崩管最佳倍增因子线性化温控技术研究

为了进一步增强机载激光测距机在全温范围内的环境适应性，分析了温度与探测器模块输出功率信噪比的关系，推导了最佳倍增因子与温度的方程式，阐述了温度变化引起倍增因子对最佳雪崩倍增因子偏离的原因。根据雪崩管探测器雪崩击穿电压的线性温度特性，设计了机载温度范围为-55℃~70℃的基于自然对数法的最佳倍增因子雪崩偏压线性化温控电路，用于补偿因温度变化所引起的倍增因子对最佳雪崩倍增因子的偏离。结果表明，实测雪崩偏压温控系数为2.29V/℃，与理论分析值误差仅为4%。该技术用于新型机载激光测距系统中，获得了良好的试验数据，满足机载环境的特殊需求。

Study on linear temperature control for the optimal multiplication factor of avalanche photodiodes

In order to further enhance the environmental adaptability of an airborne laser rangefinder in the full temperature range, the relationship between temperature and output power signal-to-noise ratio of a detector module was analyzed. The equation for the optimum multiplier factor and temperature was derived. The reasons for the deviation of the best avalanche multiplier factor caused by temperature change were expounded. According to linear temperature characteristics of the breakdown voltage of an avalanche detector, based on natural logarithm method, a linear temperature controlled circuit of the avalanche bias voltage was designed to compensate the multiplication factor due to temperature in the range of -55℃~70℃. Good test results were obtained with this method used in new airborne laser rangefinders.The experimental results show the measured temperature control coefficient of the avalanche bias voltage is 2.29V/℃ with an error of less than 4% relative to the theoretical coefficient. This method meets the special requirement for airborne environment.