Response of a fiber Bragg grating ultrasonic sensor

Pavel Fomitchov; Sridhar Krishnaswamy

doi:10.1117/1.1556372

Response of a fiber Bragg grating ultrasonic sensor

Pavel Fomitchov^*, Sridhar Krishnaswamy

^*Corresponding author for this work

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

137 Scopus citations

Abstract

A fiber Bragg grating (FBG) sensor for detection of ultrasonic waves in liquids and solid structures is investigated. The sensor contains a fiber probe with a FBG, a tunable narrowband laser source, and a photodetector. When ultrasonic waves impinge on the fiber probe, the pitch of the grating is modulated through the elasto-optic effect. The corresponding changes in reflectivity of the grating are detected by a photodetector. The sensitivity of the sensor and its frequency and directional response in the 0.5 to 3.0 MHz range are measured. Some anomalous features of the FBG ultrasound sensor response are noted. It is shown that these features result from a combination of the sensor's response to the direct ultrasonic waves propagating through the medium and the signal generated by axially guided ultrasonic waves propagating through the fiber probe.

Original language	English (US)
Pages (from-to)	956-963
Number of pages	8
Journal	Optical Engineering
Volume	42
Issue number	4
DOIs	https://doi.org/10.1117/1.1556372
State	Published - Apr 2003

Keywords

Biomedical optics
Fiber Bragg grating
Fiber optic sensor
Nondestructive testing
Ultrasonics

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Engineering(all)

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title = "Response of a fiber Bragg grating ultrasonic sensor",

abstract = "A fiber Bragg grating (FBG) sensor for detection of ultrasonic waves in liquids and solid structures is investigated. The sensor contains a fiber probe with a FBG, a tunable narrowband laser source, and a photodetector. When ultrasonic waves impinge on the fiber probe, the pitch of the grating is modulated through the elasto-optic effect. The corresponding changes in reflectivity of the grating are detected by a photodetector. The sensitivity of the sensor and its frequency and directional response in the 0.5 to 3.0 MHz range are measured. Some anomalous features of the FBG ultrasound sensor response are noted. It is shown that these features result from a combination of the sensor's response to the direct ultrasonic waves propagating through the medium and the signal generated by axially guided ultrasonic waves propagating through the fiber probe.",

keywords = "Biomedical optics, Fiber Bragg grating, Fiber optic sensor, Nondestructive testing, Ultrasonics",

author = "Pavel Fomitchov and Sridhar Krishnaswamy",

note = "Funding Information: This work was supported by the Air Force Office of Scientific Research through the grant #F49620-98-1-0285. We gratefully acknowledge Dr. Mike Lowe, Imperial College, United Kingdom, for useful discussion of acoustic dispersion for the optical fiber.",

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AU - Fomitchov, Pavel

AU - Krishnaswamy, Sridhar

N1 - Funding Information: This work was supported by the Air Force Office of Scientific Research through the grant #F49620-98-1-0285. We gratefully acknowledge Dr. Mike Lowe, Imperial College, United Kingdom, for useful discussion of acoustic dispersion for the optical fiber.

PY - 2003/4

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N2 - A fiber Bragg grating (FBG) sensor for detection of ultrasonic waves in liquids and solid structures is investigated. The sensor contains a fiber probe with a FBG, a tunable narrowband laser source, and a photodetector. When ultrasonic waves impinge on the fiber probe, the pitch of the grating is modulated through the elasto-optic effect. The corresponding changes in reflectivity of the grating are detected by a photodetector. The sensitivity of the sensor and its frequency and directional response in the 0.5 to 3.0 MHz range are measured. Some anomalous features of the FBG ultrasound sensor response are noted. It is shown that these features result from a combination of the sensor's response to the direct ultrasonic waves propagating through the medium and the signal generated by axially guided ultrasonic waves propagating through the fiber probe.

AB - A fiber Bragg grating (FBG) sensor for detection of ultrasonic waves in liquids and solid structures is investigated. The sensor contains a fiber probe with a FBG, a tunable narrowband laser source, and a photodetector. When ultrasonic waves impinge on the fiber probe, the pitch of the grating is modulated through the elasto-optic effect. The corresponding changes in reflectivity of the grating are detected by a photodetector. The sensitivity of the sensor and its frequency and directional response in the 0.5 to 3.0 MHz range are measured. Some anomalous features of the FBG ultrasound sensor response are noted. It is shown that these features result from a combination of the sensor's response to the direct ultrasonic waves propagating through the medium and the signal generated by axially guided ultrasonic waves propagating through the fiber probe.

KW - Biomedical optics

KW - Fiber Bragg grating

KW - Fiber optic sensor

KW - Nondestructive testing

KW - Ultrasonics

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Response of a fiber Bragg grating ultrasonic sensor

Abstract

Keywords

ASJC Scopus subject areas

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