Patent · US Expired

Rotation sensor using a radiation emitter and detector and a duty cycle feedback loop

US5734159A · kind A · utility

1Cited by
3References
6Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJun 29, 1996
Grant dateMar 31, 1998
Priority date—
Expiry dateJun 29, 2016

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01P3/486
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A rotation sensor (5) comprises a fixed member (10) and a rotatable member (20). The fixed member (10) contains a radiation emitter (40) which emits radiation along a path (35). The rotatable member (20) rotates about an axis (65) substantially perpendicular to the path (35) and has a head containing slots (25) arranged to periodically transmit and block the radiation emitted by the emitter (40). The fixed member (210) also has a radiation detector (50) which detects radiation transmitted by the slots (25) of the rotatable member (20). Thus, the rotational movement of the rotatable member (20) with respect to the fixed member (10) is sensed by the frequency of the radiation detected by the radiation detector (50).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.