Laser liquid level gauge with diffuser

Details Laser liquid level gauge with diffuser Laser liquid level gauge with diffuser

1995-11-20

1997-07-15

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

250577, 73293, G01C 0308, G01F 2300

Patent

active

056488440

ABSTRACT:
The liquid level sensor includes a modulated laser diode and collimating optics for collimating the diode output to produce an optical measurement signal beam transmitted to the fluid boundary through a diffuser to diverge the beam. A detector detects reflections of the beam from the fluid boundary to produce an output signal which is amplified and inverted to drive the modulator. The frequency of the modulation, which depends on the distance to the fluid boundary, is measured and the distance is derived from that measurement.

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