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Optical evanescent field waveguide Bragg grating pressure sensor

机译:e逝光波导布拉格光栅压力传感器

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摘要

A ridge waveguide Bragg grating pressure or touch sensor is proposed. The sensor consists of an open-top ridge waveguide Bragg grating with an overlaid pressure sensing polydimethylsiloxane film. The effective index of the guided mode of the waveguide is changed by stress-induced variations in the film refractive index that are caused by increases in pressure normal to the waveguide. Pressure is then measured by monitoring the shift of the Bragg resonance resulting from the changes to the effective index. By using the smaller core size ridge waveguide, and a polymer with smaller Young's modulus, the sensitivity of the sensor is enhanced. By utilizing the polarization dependence of the sensor response, a temperature-independent pressure sensor can be realized.
机译:提出了脊形波导布拉格光栅压力或触摸传感器。该传感器由顶部覆盖的脊形波导布拉格光栅和覆盖的压力感应聚二甲基硅氧烷薄膜组成。波导的导模的有效折射率通过应力引起的薄膜折射率的变化而改变,该应力引起的薄膜折射率的变化是由于垂直于波导的压力增加而引起的。然后通过监测因有效指数的变化而导致的布拉格共振的移动来测量压力。通过使用较小的纤芯尺寸的脊形波导和具有较小杨氏模量的聚合物,可以提高传感器的灵敏度。通过利用传感器响应的极化相关性,可以实现与温度无关的压力传感器。

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