An optical-based pressure sensor for a 150 × 150 mm surface was designed and fabricated. The sensor utilizes a fiber Bragg grating (FBG) attached to a 30 × 30 × 30 mm actuator as the pressure sensing mechanism. The middle section of the actuator, which is circular, can bend into an elliptical form and, in the process, pull the FBGP via both ends when force or pressure is applied, thus converting the pressure applied to its surface into a wavelength shift. In laboratory testing, a sensitivity of 0.152 nm / kPa was obtained. Subsequently, the pressure sensor was tested in the field by burying it 20 cm underground to measure soil pressure, while another FBG was spliced in series to the FBGP to compensate for temperature variations. Testing shows that the proposed design can realize a compact optical-based pressure sensor with enhanced soil monitoring applications such as dynamic soil pressure caused by soil movement.

中文翻译：

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用于土壤监测应用的基于光纤布拉格光栅的压力传感器

设计并制造了适用于 150 × 150 mm 表面的光学压力传感器。该传感器利用连接到 30 × 30 × 30 mm 执行器的光纤布拉格光栅 (FBG) 作为压力传感机构。致动器的中间部分是圆形的，可以弯曲成椭圆形，在此过程中，当施加力或压力时，通过两端拉动FBGP，从而将施加到其表面的压力转化为波长偏移。在实验室测试中，获得了0.152 nm/kPa的灵敏度。随后，压力传感器进行了现场测试，将其埋在地下 20 厘米处以测量土壤压力，同时将另一个 FBG 串联到 FBGP 上以补偿温度变化。