Temperature-insensitive fiber Bragg grating dynamic pressure sensing system.
Temperature-insensitive dynamic pressure measurement using a single fiber Bragg grating (FBG) based on reflection spectrum bandwidth modulation and optical power detection is proposed. A specifically designed double-hole cantilever beam is used to provide a pressure-induced axial strain gradient along the sensing FBG and is also used to modulate the reflection bandwidth of the grating. The bandwidth modulation is immune to spatially uniform temperature effects, and the pressure can be unambiguously determined by measuring the reflected optical power, avoiding the complex wavelength interrogation system. The system acquisition time is up to 85 Hz for dynamic pressure measurement, and the thermal fluctuation is kept less than 1.2% full-scale for a temperature range of -10 degrees C to 80 degrees C.
Guo
Tuan
T
Institute of Modern Optics, Nankai University, Tianjin 300071, China. guotuan2001@163.com
Zhao
Qida
Q
Zhang
Hao
H
Zhang
Chunshu
C
Huang
Guiling
G
Xue
Lifang
L
Dong
Xiaoyi
X