Shao Li-Yang, Jiang Qi, Albert Jacques
Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China.
Appl Opt. 2010 Dec 10;49(35):6784-8. doi: 10.1364/AO.49.006784.
A novel pressure sensing scheme based on the effect of a conforming elastomer material on the transmission spectrum of tilted fiber Bragg gratings is presented. Lateral pressure on the elastomer increases its contact angle around the circumference of the fiber and strongly perturbs the optical transmission of the grating. Using an elastomer with a Young's modulus of 20 MPa, a Poisson ratio of 0.48, and a refractive index of 1.42, the sensor reacts monotonically to pressures from 0 to 50 kPa (and linearly from 0 to 15 kPa), with a standard deviation of 0.25 kPa and maximum error of 0.5 kPa. The data are extracted from the optical transmission spectrum using Fourier analysis and we show that this technique makes the response of the sensor independent of temperature, with a maximum error of 2% between 25°C and 75°C. Finally, other pressure ranges can be reached by using conforming materials with different modulii or applying the pressure at different orientations.
提出了一种基于贴合弹性体材料对倾斜光纤布拉格光栅传输光谱影响的新型压力传感方案。施加在弹性体上的横向压力会增大其在光纤圆周周围的接触角，并强烈干扰光栅的光传输。使用杨氏模量为20兆帕、泊松比为0.48且折射率为1.42的弹性体，该传感器对0至50千帕的压力呈单调响应（0至15千帕为线性响应），标准偏差为0.25千帕，最大误差为0.5千帕。数据通过傅里叶分析从光传输光谱中提取，并且我们表明该技术使传感器的响应与温度无关，在25℃至75℃之间最大误差为2%。最后，通过使用具有不同模量的贴合材料或以不同方向施加压力，可以实现其他压力范围。
