Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-12-17
1982-03-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
84 118, 340566, G02B 514
Patent
active
043214630
ABSTRACT:
An optical fiber is used as a transducer to convert a low frequency mechanical disturbance into low frequency amplitude modulated optical energy. According to the preferred embodiment of the invention transduction occurs by means of a multi-path interference phenomena capable of responding to acoustic information ranging from less than one hundredth of a cycle per second to several hundred thousand cycles per second. This feature of the invention makes the general concept applicable to use in musical instruments or as a security sensing device. When the concept is applied to a musical instrument it would preferably include the following elements in series: a solid state laser, a multi-mode or single index optic fiber, a square law detector, such as a photodiode, an audio amplifier and a speaker. When the concept is applied in the embodiment of a security sensing apparatus it would preferably include the same active elements (i.e. a solid state laser, a multi-mode or single index optic fiber, an optical detector), but the amplifier section would further include special circuitry and discrimination logic. In the security sensor embodiment the output of the device can be made compatible with any number of existing discrimination techniques based upon power spectrum densities and frequencies of domain. The length of the security sensor cable would be typically longer than the device when employed in a musical instrument and would be in the neighborhood of 100 meters.
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Nelms David C.
Woodbridge Richard C.
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