Multimode optical fiber motion monitor with audible output
First Claim
1. A motion monitor for producing audible sound, comprising:
- a flexible carrier;
an optical fiber carried by the flexible carrier and having an input end and an output end;
laser means for applying a light beam to the input end of the fiber;
a photoreceiver including photodetector means coupled to the output end of the fiber and illuminated by laser light transmitted through the fiber for producing an output signal representative of modal noise developed in the optical fiber due to physical movement of the fiber; and
sound producing means coupled to the photoreceiver for producing audible sound representative of modal noise produced at the output of the optical fiber due to movement of the optical fiber.
1 Assignment
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Accused Products
Abstract
A motion monitor which produces audible sound representative of motions of a subject or object being monitored, including a carrier, an optical fiber carried by the carrier, a laser source for injecting a laser beam in the optical fiber to produce a speckle light pattern at the output of the optical fiber, a photodetector for producing an output signal representative of modal noise developed in the optical fiber due to physical movement of the fiber, an amplifier for amplifying the output of the photodetector, and a loudspeaker which converts the amplified signals to audible sound representative of the modal noise at the fiber output. Optionally, the signals produced by the photodetector are shifted to a higher frequency range, e.g., the 500-700 Hz range, thereby to enable use of conventional inexpensive electronics and efficient loudspeakers. In one embodiment involving monitoring of a person, the frequency shifted output of the photodetector is transmitted to a remote location for remote monitoring of movements of the person. In another embodiment, the loudspeaker is mounted on the carrier and produces sound mimicking movement of the subject or object to which the carrier is attached.
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Citations
24 Claims
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1. A motion monitor for producing audible sound, comprising:
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a flexible carrier; an optical fiber carried by the flexible carrier and having an input end and an output end; laser means for applying a light beam to the input end of the fiber; a photoreceiver including photodetector means coupled to the output end of the fiber and illuminated by laser light transmitted through the fiber for producing an output signal representative of modal noise developed in the optical fiber due to physical movement of the fiber; and sound producing means coupled to the photoreceiver for producing audible sound representative of modal noise produced at the output of the optical fiber due to movement of the optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for producing motion related sound, comprising:
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an object; a flexible carrier coupled to said object; an optical fiber carried by said flexible carrier and having an input end and an output end; laser means for applying a laser beam to the input end of the optical fiber; a photoreceiver including photodetector means coupled to the output end of said optical fiber and illuminated by laser light transmitted through the fiber for producing an output signal representative of modal noise developed in said optical fiber due to physical movement of said optical fiber; and sound producing means coupled to the photoreceiver for producing audible sound representative of modal noise produced at the output of the optical fiber due to movement of the optical fiber. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification