Apparatus for detecting the angular position of a shaft using laser light backscattered from a shaft surface

PCT No. PCT/GB91/00865 Sec. 371 Date Jan. 19, 1993 Sec. 102(e) Date Jan. 19, 1993 PCT Filed May 30, 1991 PCT Pub. No. WO91/19169 PCT Pub. Date Dec. 12, 1991.Two beams of laser light are directed onto the surface of a rotary shaft at points (12a, 12b) spaced longitudinally along the shaft from one an...

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Hauptverfasser:	HALLIWELL, NEIL A
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS MEASURING MEASURING ANGLES MEASURING AREAS MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS TARIFF METERING APPARATUS TESTING
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Zusammenfassung:	PCT No. PCT/GB91/00865 Sec. 371 Date Jan. 19, 1993 Sec. 102(e) Date Jan. 19, 1993 PCT Filed May 30, 1991 PCT Pub. No. WO91/19169 PCT Pub. Date Dec. 12, 1991.Two beams of laser light are directed onto the surface of a rotary shaft at points (12a, 12b) spaced longitudinally along the shaft from one another. Light backscattered by the optically rough surface of the shaft is detected by means of detectors (18a, 18b) which produce output signals related to the detected intensity. Signal-processing means (20a, 20b) associated with each beam include memory means for storing a reference waveform. The signal-processing means (20a, 20b) provide a signal indicative of the phase of the detected intensity relative to a reference waveform stored in the memory means. A comparator (22) compares the output signals from the signal-processing means (20a, 20b) to provide an indication of torque transmitted through the shaft (12). Alternatively, a single beam and detector may be used to give an indication of angular position of the shaft.