Methods and apparatus for detecting residual liquid in container

Details Methods and apparatus for detecting residual liquid in container Methods and apparatus for detecting residual liquid in container

1983-08-01

1985-11-05

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250301, 250341, 250223B, G01F 2328, G01J 548

Patent

active

045516278

ABSTRACT:
Optical transmittances of a combination of a liquid to be detected and a container wall are measured in order to select two optical pass-bands, one of which is relatively high transmittance level while the other of which is relatively low transmittance. The light transmission quantities of the container at the selected two pass-bands are measured by one or more detecting elements. The light transmission quantities are converted into two electric signals, one of which is divided by the other in a signal process circuit.

REFERENCES:
patent: 3454759 (1969-07-01), Calhoun
patent: 4121103 (1978-10-01), Calhoun
patent: 4221961 (1980-09-01), Peyton
patent: 4236075 (1980-11-01), Nexo et al.
patent: 4236076 (1980-11-01), Judge et al.
patent: 4368980 (1983-01-01), Aldred et al.

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