Optical Angle detection apparatus

Details Optical Angle detection apparatus Optical Angle detection apparatus

1996-06-07

1998-11-17

Hellner, Mark

Optics: measuring and testing

Angle measuring or angular axial alignment

Relative attitude indication along 3 axes with photodetection

3561413, G01B 1126

Patent

active

058384324

ABSTRACT:
An optical angle detection apparatus includes a light source section, a sensor section disposed separately from the light source section through a space, a timing controller, and a calculation processing section. The light source section includes a plurality of LEDs and a plurality of first polarizing plates whose polarizing directions differ from each other by 45.degree. in correspondence with the LEDs. The sensor section includes a lens and a two-dimensional PSD. The timing controller sequentially and periodically turns on the plurality of LEDs. The calculation processing section calculates the angle of the light source section relative to the sensor section around an axis determined by the light source section and the inclination angles of the sensor section in two axial directions with respect to the optical axis of the light source section on the basis of an output from the two-dimensional PSD which changes in accordance with the amount of light incident from the light source section onto the sensor section and the coordinates of an incident spot.

REFERENCES:
patent: 3474255 (1969-10-01), White
patent: 3932039 (1976-01-01), Frey
patent: 4682024 (1987-07-01), Halldorsson et al.
patent: 4769531 (1988-09-01), Malek
patent: 4923303 (1990-05-01), Lutz
patent: 4944588 (1990-07-01), Kohler
patent: 5059789 (1991-10-01), Salcudean

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