High-sensitivity temperature-independent differential pressure sensor using fiber Bragg gratings

Sheng, Hao-Jan; Liu, Wen‐Fung; Lin, Kuei-Ru; Bor, Sheau-Shong; Fu, Ming‐Yue

doi:10.1364/oe.16.016013

Cited by 45 publications

(14 citation statements)

References 10 publications

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“…The sensitivity is dramatically improved by fixing the two ends of an FBG and changing the axial distance between the ends (5.277 nm/MPa [74] and 33.876 nm/MPa [71]). Temperature influence can be compensated by using the bimetal method [70] or by using the difference between the resonant wavelengths of two FBGs along one axis [69].…”

Section: Fbg Pressure Sensorsmentioning

confidence: 99%

Review of the Strain Modulation Methods Used in Fiber Bragg Grating Sensors

2016

Journal of Sensors

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Fiber Bragg grating (FBG) is inherently sensitive to temperature and strain. By modulating FBG's strain, various FBG sensors have been developed, such as sensors with enhanced or reduced temperature sensitivity, strain/displacement sensors, inclinometers, accelerometers, pressure meters, and magnetic field meters. This paper reviews the strain modulation methods used in these FBG sensors and categorizes them according to whether the strain of an FBG is changed evenly. Then, those even-strain-change methods are subcategorized into (1) attaching/embedding an FBG throughout to a base and (2) fixing the two ends of an FBG and (2.1) changing the distance between the two ends or (2.2) bending the FBG by applying a transverse force at the middle of the FBG. This review shows that the methods of "fixing the two ends" are prominent because of the advantages of large tunability and frequency modulation.where is the stress-optic coefficient. When temperature changes, the resonant wavelength will also change. Its inherent temperature sensitivity is about 10 pm/ ∘ C. The strain of an FBG has been modulated for varying its temperature sensitivity [31][32][33][34][35][36][37][38][39][40] and monitoring strain/displacement [41-49], inclination [50-56], acceleration [57-68], pressure [69-78], magnetic field [79-88], and rotation [89].

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Section: Fbg Pressure Sensorsmentioning

confidence: 99%

Review of the Strain Modulation Methods Used in Fiber Bragg Grating Sensors

2016

Journal of Sensors

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“…By using two FBGs and analyzing the difference in the wavelength shift, the temperature sensitivity is effectively eliminated. Furthermore, other groups proposed some feasibility techniques such as writing two FBGs in different diameter fibers, using a reference FBG, and combining FBG with Fabry-Perot cavity [15][16][17]. In this paper, a temperature compensation FBG pressure sensor based on the elastic diaphragm is reported.…”

Section: Introductionmentioning

confidence: 99%

Temperature Compensation Fiber Bragg Grating Pressure Sensor Based on Plane Diaphragm

2018

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Pressure sensors are the essential equipments in the field of pressure measurement. In this work, we propose a temperature compensation fiber Bragg grating (FBG) pressure sensor based on the plane diaphragm. The plane diaphragm and pressure sensitivity FBG (PS FBG) are used as the pressure sensitive components, and the temperature compensation FBG (TC FBG) is used to improve the temperature cross-sensitivity. Mechanical deformation model and deformation characteristics simulation analysis of the diaphragm are presented. The measurement principle and theoretical analysis of the mathematical relationship between the FBG central wavelength shift and pressure of the sensor are introduced. The sensitivity and measure range can be adjusted by utilizing the different materials and sizes of the diaphragm to accommodate different measure environments. The performance experiments are carried out, and the results indicate that the pressure sensitivity of the sensor is 35.7 pm/MPa in a range from 0 MPa to 50 MPa and has good linearity with a linear fitting correlation coefficient of 99.95%. In addition, the sensor has the advantages of low frequency chirp and high stability, which can be used to measure pressure in mining engineering, civil engineering, or other complex environment.

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“…With the advantages of immunity to electromagnetic interference, fast signal acquisition, high sensitivity and compact structure, optical fiber sensors have been extensively investigated for gas pressure sensing. A variety of optical fiber pressure sensors based on various types of fiber components, including long-period fiber gratings (LPFGs) [1][2][3][4][5][6], fiber Bragg gratings (FBGs) [7][8][9][10][11], and fiber interferometers [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] have been proposed in recent years. LPFGs inscribed in single-mode fiber (SMF) [1], photonic crystal fiber [2][3][4], polymer micro-structured fiber [5], boron co-doped optical fiber [6] and FBGs inscribed in single-mode fiber [7,8], side-hole fiber [9], air-hole micro-structured fiber [10,11], have been used as gas pressure sensors, respectively.…”

Section: Introductionmentioning

confidence: 99%

High-sensitivity gas pressure sensor based on hollow-core photonic bandgap fiber Mach-Zehnder interferometer

et al. 2018

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We propose and experimentally demonstrate a highly sensitive gas pressure sensor based on a near-balanced Mach-Zehnder interferometer (MZI) and constructed by hollowcore photonic bandgap fiber (HC-PBF) in this paper. The MZI is simply constructed by fusion splicing two HC-PBFs, which are of slightly different lengths, between two 3-dB couplers. The two output ends of each coupler are approximately equal in length, to ensure that the optical path variations of the MZI only result from the differences in the lengths between the two HC-PBFs. To apply the MZI for gas pressure sensing, a femtosecond laser is employed to drill a micro-channel in one of the two HC-PBF arms. The experiment result shows that the proposed MZI based gas pressure sensor achieves an ultrahigh sensitivity, up to 2.39 nm/kPa, which is two orders of magnitude higher than that of the previously reported MZI-based gas pressure sensors. Additionally, the effects resulting from the absolute length and relative length of the two HC-PBFs on gas pressure sensing performance are also investigated experimentally and theoretically, respectively. The ultra-high sensitivity and ease of fabrication make this device suitable for gas pressure sensing in the field of industrial and environmental safety monitoring.

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High-sensitivity temperature-independent differential pressure sensor using fiber Bragg gratings

Cited by 45 publications

References 10 publications

Review of the Strain Modulation Methods Used in Fiber Bragg Grating Sensors

Review of the Strain Modulation Methods Used in Fiber Bragg Grating Sensors

Temperature Compensation Fiber Bragg Grating Pressure Sensor Based on Plane Diaphragm

High-sensitivity gas pressure sensor based on hollow-core photonic bandgap fiber Mach-Zehnder interferometer

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