针对枪口火光触发器在强背景光下灵敏度急剧下降的问题，提出主从式火光触发技术。首先分析火光探测灵敏度的影响因素，提出适用于工程实践的火光触发器灵敏度描述方法，建立火光触发器探测灵敏度数学表达式。根据背景光对触发器探测灵敏度影响，设计主从式火光触发电路，主探测器件用于探测目标火光信号，从探测器件用于探测背景光亮度，并为主探测器实现信号处理电路增益与镜头进光量调节提供依据。设计的主从式火光触发器经验证，可有效探测 85m外鞭炮爆炸产生的火光信号，其灵敏度完全满足兵器试验中火光触发远距离的测试需求。

In order to solve the technical problem of the sensitivity of the flame trigger drops sharply under strong background light，master-auxiliary detector flame trigger technology is put forward in this paper. At first，several factors which influence the sensitivity of flame detection are analyzed. The definition of sensitivity which is suitable for flame trigger in engineering practice is described and the mathematical expression of detection sensitivity of flame trigger is established. According to the influence of flame trigger sensitivity based on background light，master-auxiliary detector circuit is devised. The masterdetector is used to detect the target fire light signal，the auxiliarydetector device is used to detect the brightness of the background light，it also provides the basis for the master detector to realize the gain of signal processing circuit and the adjustment of lens incoming light. The master-auxiliary flame trigger is verified by experiments. The result shows that the master-auxiliary flame trigger can effectively detect the radiation light of firecrackers beyond 85m，anditssensitivityfullymeetstherequirementsofthelong-distancetestoffirelighttriggerinweapontest.