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Record Details

Record 1 of 21181
Shaft Position Optical Sensor
Offline Availability: Go to Request Form
Author and Affiliation:
Blumenstock, Kenneth A. [Inventor](NASA Goddard Space Flight Center, Greenbelt, MD United States)
Hakum, Claef F. [Inventor](NASA Goddard Space Flight Center, Greenbelt, MD United States)
Johnson, Clarence S. [Inventor](NASA Goddard Space Flight Center, Greenbelt, MD United States)
Abstract: The present invention is an optical sensor that senses the movement of a shaft. Detection of radial movement is made when a portion of light incident on the shaft sensor-target is blocked. For detection of axial movement, a disk with flat surface is mounted and used to block a portion of light. The variation in the amount of light allowed to pass through is a measure of the position of the shaft. As proposed by this invention, significant improvement is made with respect to sensitivity and linearity of the system when the light is permanently partially blocked. To accomplish this goal this invention adds a boss to the system. To eliminate possible drift of system performance due to LED degradation or temperature variation, a feedback feature is added to the system.
Publication Date: Jan 23, 2001
Document ID:
20010110767
(Acquired Nov 23, 2001)
Subject Category: OPTICS
Report/Patent Number: US-Patent-6,177,997, US-Patent-Appl-SN-376000, US-Patent-Appl-SN-097083, NASA-Case-GSC-13988-3
Document Type: Patent
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: OPTICAL MEASURING INSTRUMENTS; SHAFTS (MACHINE ELEMENTS); DETECTION; LIGHT EMITTING DIODES; PATENTS; FEEDBACK; FLAT SURFACES
Miscellaneous Notes: Provisional application of US-Patent-Appl-SN-097083, filed 19 Aug. 1998
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