Space-frequency imagery of sound sources by interferometric methods
Abstract
The interferometric acquisition of space-frequency acoustic imagery is examined. Following a brief review of the development and principles of interferometric measurement, attention is given to the estimation of the direction and received power of a sound source by means of interferometric acoustic imagery techniques, multiple-base interferometric imagery, and the angular resolution of such techniques. The effects of propagation in the atmosphere on the transverse coherence, and angular resolution of interferometric acoustic imagery are considered, and interferometric imagery at a finite distance and in two dimensions is examined. Examples of the use of acoustic imagery in the investigation of multiple source industrial noise, vehicle noise and noise radiated by a viaduct are presented and the deconvolution and enhancement of the images are discussed. It is concluded that interferometric imagery is capable of providing means of localizing and describing noise sources in studies of industrial and vehicular noise pollution.
- Publication:
-
Revue d'Acoustique
- Pub Date:
- 1980
- Bibcode:
- 1980RvAc...13..153E
- Keywords:
-
- Acoustical Holography;
- Imaging Techniques;
- Interferometry;
- Sound Detecting And Ranging;
- Angular Resolution;
- Image Enhancement;
- Noise Pollution;
- Sound Propagation;
- Instrumentation and Photography