Document Detail

Influence of membrane surface shape change on the performance characteristics of a fiber optic microphone.
MedLine Citation:
PMID:  21151221     Owner:  NLM     Status:  In-Process    
At a reflective intensity modulated fiber optic microphone (RIM-FOM), the acoustic signal makes a membrane vibrate and modulate the reflected intensity. In the existing models of the RIM-FOM, the offset of all points of the membrane, due to the vibration, is assumed to be equal. However, this assumption does not represent the actual vibration of the membrane, which follows a continuous surface shape change caused by the acoustic signal. We establish a revised theoretical model in which the influence of the actual membrane surface shape change on the reflective intensity modulation is considered. Experiments show that there is a discrepancy between the experimental optimum operating distance and the analytical result from the existing model, while our new model gives a better agreement with the experimental results. In particular, our analysis shows that, in using the existing model, the other microphone performance characteristics are misestimated, while our revised model can provide a closer solution.
Rui Li; Nicholas Madamopoulos; Wen Xiao
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  49     ISSN:  1539-4522     ISO Abbreviation:  Appl Opt     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-12-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6660-7     Citation Subset:  -    
School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China.
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