Response of a fiber Bragg grating ultrasonic sensor

Pavel Fomitchov*, Sridhar Krishnaswamy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

137 Scopus citations


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 languageEnglish (US)
Pages (from-to)956-963
Number of pages8
JournalOptical Engineering
Issue number4
StatePublished - Apr 2003


  • Biomedical optics
  • Fiber Bragg grating
  • Fiber optic sensor
  • Nondestructive testing
  • Ultrasonics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)


Dive into the research topics of 'Response of a fiber Bragg grating ultrasonic sensor'. Together they form a unique fingerprint.

Cite this