Wireless, Portable Fiber Bragg Grating Interrogation System Employing Optical Edge Filter

Ogawa, Ken; Koyama, Shozo; Haseda, Yuuki; Fujita, Kouji; Ikeda, Hiroaki

doi:10.3390/s19143222

Cited by 37 publications

(11 citation statements)

References 36 publications

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“…Passive interrogation does not involve active electrical, mechanical, or optical devices. It involves interrogators having passive devices such as filters that are wavelength dependent such as edge filters [42][43][44][45] or wavelength division multiplexing (WDM). 46 Power detection-based passive interrogation is another method, where source having intensity that is wavelength dependent such as erbium-doped amplifier fiber is used.…”

Section: Interrogation Of Fbg Sensormentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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Fiber Bragg grating has embraced the area of fiber optics since the early days of its discovery, and most fiber optic sensor systems today make use of fiber Bragg grating technology. Researchers have gained enormous attention in the field of fiber Bragg grating (FBG)-based sensing due to its inherent advantages, such as small size, fast response, distributed sensing, and immunity to the electromagnetic field. Fiber Bragg grating technology is popularly used in measurements of various physical parameters, such as pressure, temperature, and strain for civil engineering, industrial engineering, military, maritime, and aerospace applications. Nowadays, strong emphasis is given to structure health monitoring of various engineering and civil structures, which can be easily achieved with FBG-based sensors. Depending on the type of grating, FBG can be uniform, long, chirped, tilted or phase shifted having periodic perturbation of refractive index inside core of the optical fiber. Basic fundamentals of FBG and recent progress of fiber Bragg grating-based sensors used in various applications for temperature, pressure, liquid level, strain, and refractive index sensing have been reviewed. A major problem of temperature cross sensitivity that occurs in FBG-based sensing requires temperature compensation technique that has also been discussed in this paper.

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Section: Interrogation Of Fbg Sensormentioning

confidence: 99%

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

2020

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“…FBG sensors have the potential to overcome these problems. A wearable FBG interrogator was developed and can now be used as a wearable multi-vital sign sensor [ 30 ]. We expect this report to be an important step towards realizing the development of these sensors.…”

Section: Discussionmentioning

confidence: 99%

“…The outline of the FBG interrogator is shown in Figure 2 . Our edge-filter module is used with the FBG interrogator [ 30 ]. This edge filter has polarization dependent loss.…”

Section: Methodsmentioning

confidence: 99%

Verification of the Propagation Range of Respiratory Strain Using Signal Waveform Measured by FBG Sensors

Koyama

Fujimoto

Yasuda

et al. 2020

Sensors

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The FBG (Fiber Bragg grating) sensor is an optical fiber type strain sensor. When a person breathes, strain occurs in the lungs and diaphragm. This was verified using an FBG sensor to which part of the living body this respiratory strain propagates. When measured in the abdomen, the signal waveforms were significantly different between breathing and apnea. The respiratory cycle measured by the temperature sensor attached to the mask and the strain cycle measured by the FBG sensor almost matched. Respiratory strain was measured in the abdomen, chest, and shoulder, and the signal amplitude decreased with distance from the abdomen. In addition, the respiratory rate could be calculated from the measured strain signal. On the other hand, respiratory strain did not propagate to the elbows and wrists, which were off the trunk, and the respiratory time, based on the signal period, could not be calculated at these parts. Therefore, it was shown that respiratory strain propagated in the trunk from the abdomen to the shoulder, but not in the peripheral parts of the elbow and wrist.

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“…The filter of the presented inclinometer is actuality a section of TFBG written on head face of the fiber. Then, a 15 mm long fiber Bragg grating is written into a common single-mode fiber by using scanning phase mask and a continuous ultraviolet laser beam [ 35 , 36 , 37 ]. The production process includes two steps.…”

Section: Sensor Setup and Principlementioning

confidence: 99%

A Temperature Independent Inclinometer Based on a Tapered Fiber Bragg Grating in a Fiber Ring Laser

Lin

Zhou

Shao

et al. 2021

Sensors

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We demonstrate a new concept for an all-fiber inclinometer based on a tapered fiber Bragg grating (tFBG) in a fiber ring laser (FRL) with the capability of measuring the tilt angle and temperature simultaneously. The sensor performance is analyzed theoretically and investigated experimentally. The dependence of tilt angle on the spectral response in variable temperature conditions was measured. Two inclinometers with different lengths have been fabricated and characterized in FRL. The sensitivity is 0.583 dB/° and 0.849 dB/°, respectively, in the range of 0° to 90°. Thanks to the FRL system, narrow 3-dB bandwidth (<0.1 nm) and high optical signal-to-noise ratio (~60 dB) are achieved. The tFBG in the FRL system can be used for working as a temperature insensitive inclinometer. The results suggested that the proposed inclinometer has the advantages of compact size and convenient manufacture, enhancing its potential for application prospect.

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Wireless, Portable Fiber Bragg Grating Interrogation System Employing Optical Edge Filter

Cited by 37 publications

References 36 publications

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Fiber Bragg grating sensors for monitoring of physical parameters: a comprehensive review

Verification of the Propagation Range of Respiratory Strain Using Signal Waveform Measured by FBG Sensors

A Temperature Independent Inclinometer Based on a Tapered Fiber Bragg Grating in a Fiber Ring Laser

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