研究了一种基于波长扫描激光器的光纤温度压力测量系统.光纤传感头为边孔光纤光栅，利用其特有的双折射特性产生双反射峰，以实现对温度和压力的同时测量.系统采用嵌入式开发技术，将激光波长扫描、光谱数据采集和以牛顿最小二乘法为核心的光栅解调算法高度整合于一体，极大降低了光纤传感系统的体积与成本.实验结果表明，在温度10~50℃、压力0~1.2 MPa时，双反射峰对应温度与压力的变化均呈现良好的线性响应特性；系统的波长解调准确度可达1 pm，温度及压力的分辨率分别达到0.1℃和0.1 MPa.该系统可为温度、压力的参量测量提供低成本、小型化、性能可靠的解决方案.

An optical fiber temperature and pressure simultaneous measurement system based on wavelength scanning laser was proposed. The fiber optic sensor head is fiber Bragg gratings based on side hole polarization maintaining fibers. Taking use of its unique double reflection peaks arising from birefringence, simultaneous measurement of temperature and pressure can be acheived. Embedded technology was applied in the system. The controls of laser wavelength scanning, acquisitions of spectral data and the data demodulations based on Newton least squares fitting algorithm, were highly integrated in one system, greatly reducing the size and cost of the fiber optic sensing system. Experimental results show that the double reflection peaks correspond to changes in temperature and pressure with a good linear characteristics, in the temperature range of 10~50 ℃ and the pressure range of 0~1.2 MPa. The wavelength demodulation accuracy of the system is up to 1 pm, corresponding to the resolution of temperature and pressure is up to 0.1 ℃ and 0.1 MPa, respectively. The proposed system can provide a low cost, small size, reliable system solutions to the simultaneous measurements of temperature and pressure.