Non-contacting torque sensor and displacement measuring apparatu

Details Non-contacting torque sensor and displacement measuring apparatu Non-contacting torque sensor and displacement measuring apparatu

1996-12-20

1998-05-19

Font, Frank G.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356345, 250237G, G01B 902

Patent

active

057542953

ABSTRACT:
A displacement measuring apparatus is disclosed, one embodiment of which employs two diffractive code disks, attached to a shaft, and a sensing head which need not contact the shaft. The head includes a light source with beam shaping optics, which creates two individual beamlets and pre-cranks the beamlets so that they reach the first grating at proscribed angles. Two diffracted orders from the first grating are allowed, preferably through free space propagation, to strike the second grating and to be rediffracted by the second grating. A phased-array detector, or equivalent array of detecting elements, are positioned beyond the second grating and in a region of natural interference between rediffracted orders of the incident diffracted orders, to detect the interference fringes which are generated there. The change in phase of the fringes is proportional to the relative displacement between the first and second gratings.

REFERENCES:
patent: 5327218 (1994-07-01), Igaki
patent: 5386291 (1995-01-01), Sato
patent: 5430546 (1995-07-01), Huber
patent: 5450199 (1995-09-01), Rieder
patent: 5486923 (1996-01-01), Mitchell et al.
patent: 5559599 (1996-09-01), Michael
patent: 5559600 (1996-09-01), Mitchell
"Rotating Torque Sensor", Nov. 1995, Sensor Developments, Inc., Lake Orion, MI.
"Rotating Torque Sensor Evolution", prior to Jun. 10, 1996, Sensor Developments, Inc., Lake Orion, MI.
"Now Measure Torque and Angle or R.P.M. Simultaneously", Jun. 10, 1996, Sensor Developments, Inc, Lake Orion, MI.
R. Beyerle, "Slotted Disc Senses Angular Acceleration", Nov. 23, 1995, Machine Design, p. 54.
Advertisement, Sensor Developments, Inc., May, 1996, NASA Tech Briefs, p. 96.

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