Wavelength-division multiplex digital optical position sensor

Details Wavelength-division multiplex digital optical position sensor Wavelength-division multiplex digital optical position sensor

1994-11-21

1996-03-12

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022723, 250226, 359115, 356395, G01D 534

Patent

active

054988675

ABSTRACT:
According to a first aspect of the invention, an optical position sensor employs a position encoder having collimators and reflectors with mutually aligned optical axes mounted in a support. A slotted code plate moves between the collimators and reflectors in a plane non-perpendicular to their optic axes. This encoder converts position to optical signals reliably, regardless of mechanical shock or vibration. According to a second aspect of the invention, an optical position sensing system employs wavelength-division multiplexing to distribute light pulses to different position encoders and time-division multiplexing to further distribute pluses to the collimators in each encoder. This permits multiple position encoders to be served by a single light source and optical fiber.

REFERENCES:
patent: 4842357 (1989-06-01), Doneen
patent: 4849624 (1989-07-01), Huggins
patent: 4964727 (1990-10-01), Huggins
patent: 5237391 (1993-08-01), Huggins
patent: 5281811 (1994-01-01), Lewis
patent: 5424535 (1995-06-01), Albion et al.
Optics Letters, vol. 11, No. 1, Jan. 1, 1986, "Wavelength-Division Multiplexed Digital Optical Position Transducer," Fritsch et al.
Fiber Optic Systems For Mobile Platforms II, SPIE vol. 989, pp. 29-37, (1988), "Wavelength Division Multiplexed Fiber Optic Sensors For Aircraft Applications", Lewis et al.

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