An Optical Fiber Soil Pressure Sensor with Double Sensitive Surfaces

doi:10.12382/bgxb.2023.0932

Abstract

Abstract:

The existing fiber Bragg grating (FBG) soil-pressure sensors are prone to cause the broadening or even chirping of reflection spectrum due to the uneven stress of FBG, which reduces the measurement accuracy. A soil pressure sensor with double sensitive surfaces is designed and fabricated based on a diamond metal frame and a metalized FBG. The FBG is directly welded and fixed at both ends of the diagonal of diamond metal structure. The external pressure is applied to both ends of the grating after it is amplified by the diamond metal structure, so that the FBG is always suspended and tensioned with uniform stress. Therefore, the reflection spectrum broadening and chirping caused by uneven force on the FBG are avoided. The welding process is used to avoid the problems of creep, aging and failure caused by adhesive, and the high measuring accuracy and long-term stability of the sensor are improved. The analyzed and experimental results show that the wavelength-pressure sensitivity coefficient of the FBG soil pressure sensor is 624pm/MPa and the measuring range is 3.5MPa.

Key words: soil pressure sensor, fiber Bragg grating, diamond metal structure, double-sided pressure sensing

CLC Number:

TP212

ZHOU Huijuan, YU Shangjiang, CHEN Jinyang, CHEN Xian, MENG Xiaojie. An Optical Fiber Soil Pressure Sensor with Double Sensitive Surfaces[J]. Acta Armamentarii, 2023, 44(S1): 132-137.

Figures/Tables 11

Fig.1 Structural diagram of the FBG soil pressure sensor

Fig.2 Stress analysis of the FBG sensor

Fig.3 Photo of FBG with diamond structure

Fig.4 Stress distribution of diamond structure under compression

Fig.5 Structural deformation of diamond structure under compression

Fig.6 Stress distribution of diamond structure under tension

Fig.7 Structural deformation of diamond structure under tension

Table 1 Simulated results

工况	载荷/ MPa	最大应力/ MPa	Y方向总位移/μm	X方向总位移/μm
工况1	-3.33	276	338	130
工况2	3.33	276	338	130

Fig.8 Photo of FBG soil pressure sensor

Fig.9 Calibrated results of FBG soil pressure sensor

Fig.10 Calibrated results of sensitivity coefficient of FBG soil pressure sensor

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