Optical microphone based on a modulated diffractive lens
β Scribed by Sagberg, H.; Sudbo, A.; Solgaard, O.; Bakke, K.A.H.; Johansen, I.R.
- Book ID
- 118173620
- Publisher
- IEEE
- Year
- 2003
- Tongue
- English
- Weight
- 329 KB
- Volume
- 15
- Category
- Article
- ISSN
- 1041-1135
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## Abstract An optical microphone incorporating a reflective diaphragm and a fiberβoptic head is demonstrated. The diaphragm is made of a micromirror membrane which is suspended by a silicon bar connected to a frame, allowing for displacement induced by acoustic waves. A compact and simple optical
A new type of microphone is described. The measurements on a microphone prototype with a membrane diameter of 7 mm show the following results: flat frequency response from zero Hz (if required) to 20 kHz, sensitivity 60 mV/N/m 2, output can be loaded with a resistance as low as 600 s distortion sati