Optical phase difference range determination in liquid level sen

Details Optical phase difference range determination in liquid level sen Optical phase difference range determination in liquid level sen

1992-04-06

1994-03-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 5, G01N 1506

Patent

active

052910318

ABSTRACT:
An apparatus and electronic circuit for the measurement of fluid levels in containers. The circuit and apparatus constitute an instrument which measures fluid levels by optical means. Only light signals are used near the fluid itself. The instrument thus provides an intrinsically safe method of measuring fluid levels in the presence of explosive or flammable fluids, vapours or gasses, or in containers which must be electrically isolated.

REFERENCES:
patent: 4689489 (1987-08-01), Cole
patent: 4692023 (1987-09-01), Ohtomo et al.
patent: 4938590 (1990-07-01), Ishida

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