Feasibility Demonstration of Optical Detection of Low Frequency Sound.
Abstract
Analysis and experiments were performed to demonstrate the feasibility of optical detection of low frequency sound. Both amplitude and phase detection were examined and in each case experimental results substantiated theoretical predictions. The interferometer (phase detection) technique was found superior to the beam steering (amplitude modulation) technique due to the former's frequency independence and greater sensitivity. Theoretical extrapolation of experimental results to parameter values not achievable with available laboratory equipment indicate a practically achievable sensitivity of -80 db (re 1/micro bar) per meter path length for phase detection.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 21, 1975
- Accession Number
- ADA009424
Entities
People
- J. A. Cunningham
- Jacob Cole
- Robert L. Johnson
Organizations
- TRW Inc.