Optical encoder with variable-phase sinusoidal output

Details Optical encoder with variable-phase sinusoidal output Optical encoder with variable-phase sinusoidal output

G - Physics

01

D

G01D 5/26 (2006.01)

Patent

CA 2196617

The general purpose of the invention is to produce a sinusoidal output wave whose phase shift will be proportional to the angular shaft position. A single rotation of the shaft produces a large number of cycles of the sine wave. The amplitude and frequency of the sine-wave output are both constant, and the sine-wave output continues at the same amplitude and frequency even when the shaft angle is stationary. A single source of light is used to illuminate a large number of closely spaced detectors, and the light intensity is constant in time. The light passes through an optical disk with a pattern of alternately light and dark radial lines on it, arranged in a circumferential array, which modulate the transmitted light to produce a sinusoidal pattern of illumination of an array of detectors. The array of closely-spaced detectors is scanned serially at high speed to produce a continuous stream of analog output data which emulates the output produced by a resolver or LPDT (see Ref. 1). A distinguishing characteristic of the device is that it is not necessary, or even desirable, to digitally sample the output signal as is done in Ref. 2. Instead, the output signal is processed in its' original analog form by an ASIC (Application Specific Integrated Circuit) which is generic in nature, and not specifically designed for optical encoders. A second distinguishing characteristic of the device is that a single optical source of illumination can be used at constant intensity, which greatly simplifies the optical characteristics of the device, while other devices of this type typically require pulsing and/or time phase-shifting of multiple optical sources relative to each other (see Ref. 3).

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