| 摘要 |
An acoustic to optical pulse code modulating transducer includes a microphone housing. An optical fiber is supported, by suitable means coupled to the housing, at a position displaced from one end of the fiber so that the one end is oriented within the housing. Electromechanical transducing means, coupled to the housing, support a diode light source. The light source and the optical fiber are so aligned that, when the electromechanical transducing means is unexcited, light from the source is directed through the first end to the optical fiber. An acoustic diaphragm is affixed to the housing. The diaphragm is coupled to the fiber at a point between the aforesaid position and the first end. The electromechanical transducing means is excited so that the light source is vibrated along a path perpendicular to the axis of the optical fiber. The light source is suitably electrically powered. In accordance with certain features of the invention, the electromechanical transducing means is excited at a frequency higher than 20,000 cycles per second, or at a vibration frequency at least twice the maximum acoustic frequency of interest. The electromechanical transducer can be a piezoelectric bimorph bender. The first end of the fiber can be formed with a lens. The fiber can be adjustably supported in the housing.
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