中文摘要：

提出了一种基于圆柱形容器和活塞结合的双光纤Bragg光栅（FBG）温度和压力同时区分测量的传感模型。将FBG1和FBG2粘结在基底材料上，基底材料固定在活塞和圆柱形底部间，圆柱形容器内压力和温度的变化将引起FBG1波长的变化，圆柱形容器内温度的变化引起FBG2波长的变化，通过2根光栅的波长漂移来进行温度和压力的区分测量。实验测得该传感器的压力响应灵敏度系数为0．8223nm／MPa，温度响应灵敏度系数为0．0322nm／℃，分别是裸FBG的274倍和3．2倍。该传感器可以实现10MPa压力以下、-20-100℃温度的液体和气体的高精度同时测量；可以改变基底材料的种类或基底材料和活塞的参数，实现不同灵敏度要求的温度、压力同时测量。

英文摘要：

A novel double-fiber Bragg grating（FBG） sensor for simultaneous discriminating measurement of temperature and pressure was proposed based on columned vessel and piston. FBC, 1 and FBG 2 were stuck to the fundus material by strong pastern. Fundus material was fixed by dowels between the piston and the bottom of columned vessel. The changes of temperature and pressure in the columned vessel result in the wavelength shift of FBC, 1. Only the change of temperature in the columned vessel causes the wavelength shift of FBG, 2, the pressure＇s influence can be neglected. The external pressure and temperature can be measured by testing the reflective wavelength shift of FBG 1 and FBG 2. The experimental pressure sensitivity coefficiedit is 0. 8223 nm/MPa,and the temperatuer sensitivity coefficient is 0. 0322 nm/℃ ,which are 274 and 3. 2 times of that bare FBG respectively. The sensor can be used in the liquid or gas environment to higlvsensitivity simulataneous discriminating measurement of temperature and pressure in the range 0-10 MPa,- 20-100 ℃. The sensitivity of sensor can be altered by changing the fundus or the parameters of fundus material and piston to meeth the measurements of different sensitivities.