光源加热型高灵敏度光纤热式风速计

High Sensitivity Optical Fiber Thermal Anemometer Heated by Light Source

针对光纤热式风速计需要专门的泵浦激光或加热电阻所带来的成本增加和操作不便,提出了基于光源自加热效应的高灵敏度光纤热式风速计。首先在单模光纤端面用紫外光固化胶制作法布里-珀罗干涉仪并将其作为传感探头;然后利用传感探头对输入宽带光源的吸收所产生的热量,获得自身较高的初始温度;最后测量传感探头在气流作用下温度降低及应变所引起的干涉光谱的波长漂移量,根据波长漂移量与风速的特定关系来实现风速测量。在0~7 m/s的风速范围内对传感探头进行测量,结果表明传感探头获得高达-3.13 nm/(m·s^(-1))的风速灵敏度,响应时间约为250 ms。

Because of the high cost and inconvenience caused by the need for a particular pump laser or heating resistor for the optical fiber thermal anemometer,a high-sensitivity optical fiber thermal anemometer based on the heating effect of the light source is proposed.First,the Fabry-Perot interferometer is made with ultraviolet curing glue on the end face of single-mode optical fiber and used as a sensing probe.Then,a higher initial temperature is obtained by using the heat absorbed by the sensor probe to the input broadband light source.Finally,the wavelength drift of the interference spectrum caused by the temperature drop and strain of the sensor probe under the action of air flow is measured,and the wind speed measurement is realized according to the specific relationship between the wavelength drift and the wind speed.The sensor is measured in the wind speed range from 0 to 7 m/s.The results show that the sensor achieves wind speed sensitivity up to-3.13 nm/(m·s^(-1)),and the response time is about 250 ms.