Simple Pressure Sensor with Highly Customizable Sensitivity Based on Fiber Bragg Grating and Pill-Shaped 3D-Printed Structure

Table 1

Comparison of the sensitivity of several reported FBG pressure sensors.

Method	Pressure range	Sensitivity (wavelength shift)	References
Bare FBGs were put in the pressure chamber	70 MPa	nm/MPa	[4]
FBGs were put in a glass-bubble housing	14 MPa	nm/MPa	[5]
FBGs were glued on Bourdon tube	1 MPa	1.414 nm/MPa	[6]
FBGs were put in a resin cylinder	0.4 MPa	2.08 nm/MPa	[18]
FBGs based on the diaphragm-cantilever	10 MPa	0.34 nm/MPa	[26]
FBGs based on the plane diaphragm	50 MPa	nm/MPa	[27]
FBGs based fixed guided beam	2 MPa	1.03 nm/MPa	[28]
FBG encapsulated in a partially polymer-filled metal cylinder	0.1 MPa	39.6 nm/MPa	[10]
FBG embedded in a polymer-filled metal cylinder	0.45 MPa	5.277 nm/MPa	[12]
FBG encapsulated in a polymer-half-filled metal cylinder	0.2 MPa	33.5 nm/MPa	[13]
FBGs were put in the pill-shaped 3D-printed structure	0.35 MPa	4.11 nm/MPa	This study