Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1984-11-23
1987-01-06
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
250577, 604253, G02B 514, A61M 516
Patent
active
046352813
ABSTRACT:
A light source to project a light beam along an axis to a receiver means intermediate the source and the receiver to cause the light to refract so that the light reaching the receiver is substantially reduced; means to periodically introduce a quantity of liquid into the area where the light is refracted, the liquid changing the amount of refraction whereby the light reaching said receiver is substantially increased; and means to detect each said change in light at said receiver and count same.
REFERENCES:
patent: 4270049 (1981-05-01), Tanaka et al.
patent: 4432762 (1984-02-01), Dawe
patent: 4443699 (1984-04-01), Keller
patent: 4496351 (1985-01-01), Hiller et al.
Heyman John S.
Olsson Frederick J.
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