红外光纤双波段法对桥丝温度的测量

The Two-wavelength Infrared Fiber Temperature Measuring for Bridgewire

针对桥丝辐射温度检测中存在被测目标体积小,红外辐射量小,远距离传输损耗大等难点技术问题,设计了一种双波长光纤温度测量系统。根据电火工品热辐射的原理,得出双波长测温数学模型,采取有效的光学光纤耦合和提高系统信噪比的措施,采用InSb(响应波长范围为0.8～3μm)和HgCdTe(响应波长范围为3～5μm)双波段探测器,实现了对电火工品目标进行非接触的感应电流及温度测量。测试装置电磁屏蔽能力强,受环境温度影响小,避免了温度漂移带来的测量误差,测量温度精度达到1K,为桥丝等极弱热辐射的温度检测奠定了基础。

The temperature testing of bridge wire radiation has many difficult technical problems,for instance,the small size of detected target,the small volume of infrared radiation,the large signal loss in distant transportation,etc.A two-wavelength fiber optic temperature measuring system was developed.The principle of the thermal radiation about the Electric initiating Explosive Device （EED） is analyzed and two-wavelength mathematics model is derived.Effective optical fiber coupling combined with methods for developing SNR in system are adopted.The InSb （response range is 0.8～3 μm） and HgCdTe （response range is 3～5 μm） are chosen as the two-wavelength detector.Inductive current and temperature measurement are realized using uncontacted method to EED target.The test device has strong electromagnetic shielding ability,and is free of environmental temperature effect.The measurement error caused by the temperature drift is avoided.The measurement precision is 1 K.It becomes the base of achieving the temperature measurement further in extremely weak thermal radiation of EED like bridge wire.