Feasibility Demonstration of Fiber Optic Detection of Low Frequency Sound.
Abstract
The response of an optical fiber in water to low frequency acoustic waves was investigated experimentally and compared with analytical results. A change in the optical index of refraction of the fiber creates an effective path length change for the optical beam which results in a phase shift of the beam with respect to a reference beam unaltered by the acoustic field. By mixing the phase shifted beam with a reference beam of constant phase on a photodetector, the phase variation at the acoustic frequency is detected. Potential Navy applications of this technology for acoustic arrays are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 25, 1977
- Accession Number
- ADA040382
Entities
People
- Jacob Cole
- P. G. Bhuta
- Robert L. Johnson