低温对激光起爆系统能量传输效率的影响（英文）

Influence of Low Temperature on Laser Transmission Efficiency in Laser Initiation Subsystem

为了对激光起爆系统（LDI）在低温下的可靠性进行评估，对双路LDI系统及各器件性能开展了温度试验和起爆试验研究。通过激光起爆器感度试验，得到对应20℃和-40℃时0．95置信水平下99．9％发火可靠度的激光能量值分别为0．783mJ和0．747mJ。在-40-20℃，对半导体激光器和光传输系统在低温下的特性进行了研究，分析得到了数值拟合经验公式。通过拟合公式计算得到每路激光起爆器上的发火能量值，进而得到LDI系统的发火裕度大于3。采用低温发火试验，验证了双路激光起爆系统可在低温下正常发火，具有较高的设计裕度。

To evaluate the reliability of laser diode initiation（LDI） subsystem at low temperature, the performances of a dual-way LDI subsystem and its individual parts were studied by temperature test and initiation test. Based on sensitivity tests of laser initiators, 99.9% firing laser energy at 95% confidence level was estimated as 0. 783 mJ at 20℃ and 0. 747 mJ at -40 ℃. The characteristics of semiconductor laser and optical transmission effi- ciencies were studied at -40-20℃ and a numerical fitting empirical formula was obtained via analysis. The value of firing energy to each laser initiator was calculated and obtained using the fitting formula and the ignition margin of the LDI subsystem obtained is more than 3. Through low temperature firing test, it is verified that the dual-way LDI subsystem can be normally fired, having a higher design margin.