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为了扩大应变测量的范围,提出了使用两个分布反馈式(DFB)激光器作为光时域反射-光纤光栅(OTDR-FBG)传感系统的光源的方法,并设计了相应的纳秒脉冲驱动电路和温控电路,得到两个激光器的驱动脉冲宽度分别为3.10ns和3.18ns,脉冲幅值分别为4.40V和4.08V,温度控制电路精度达到±0.04℃。经测试得到的纳秒脉冲和温控精度满足OTDR-FBG传感系统的要求。
In order to expand the range of strain measurement, a method of using two distributed feedback (DFB) lasers as the light source of an OTDR-FBG sensing system is proposed and a corresponding nanosecond pulse drive circuit And the temperature control circuit, the driving pulse widths of the two lasers are 3.10ns and 3.18ns respectively, the pulse amplitudes are 4.40V and 4.08V respectively, and the temperature control circuit achieves a precision of ± 0.04 ° C. The tested nanosecond pulse and temperature control accuracy meet the requirements of the OTDR-FBG sensing system.