基于OTDR和SMA原理的分布温度阈值执行器的设计

温度阈值执行器的设计是准分布光纤温度报警系统对温度报警空间定位的关键.本文分析了基于OTDR和SMA设计温度阈值执行器的原理,提出了执行器的物理模型.通过实验测试,从SMA弹簧样品中选出了满足执行器技术要求的记忆弹簧,完成了执行器的机械设计.系统运行表明:执行器能有效运作,能够实现准分布温度报警,并且系统具有接近1.5 m的空间分辨率和低于16 s的响应时间等优良的性能参数.

Designing quasi-distributed threshold temperature actuator based on OTDR and SMA principle

The design of threshold temperature actuator is the key technology for the quasi-distributed fiber optical temperature annunciator system to locate the position where the temperature alarm is taking place.Therefor the principle of designing the actuator based on OTDR(optical time domain reflectometer) and SMA(shape memory alloy) are analyzed,and the actuator's physical model are put forward too.By experiment research such SMA spring that meet the actuator'technical specififcations had been chosen from the samples.And then the actuator's mechanic design are implemented by making use of that SMA spring.The system's running show that the threshold temperature actuator can operate efficiently and that the system can realize quasi-distributed temperature alarm,and moreover the system has such excellent performance parameter as spatial resolution approaching 1.5 meter and response time under 16 second.