Process and apparatus for measuring optical density changes and

Details Process and apparatus for measuring optical density changes and Process and apparatus for measuring optical density changes and

1982-03-26

1987-07-14

Rosenberger, R. A.

Optics: measuring and testing

Refraction testing

G01N 2141

Patent

active

046799362

ABSTRACT:
A recirculating optical/electronic closed loop feedback process and appars in which nanosecond light pulses are triggered by a pulse generator upon arrival of previous signals that have just completed a round trip through the closed loop feedback system. The optical path is comprised of a light source and a detector between which is mounted beam forming optics that guide the light beam from the light source through a transparent vessel having a semitransparent medium therein whose refractive index and/or transparencies are measured. The electronic portion is comprised of a pulse amplifier for amplifying the detected light beam that in turn is repetitively applied to a high rate pulse generator to retrigger the light source through a pulse counter that records the number of signal circulations which pass through the closed loop during a given time to indicate the change of transmissivity of said medium.

REFERENCES:
patent: 3437821 (1969-04-01), Thompson et al.
patent: 4269506 (1981-05-01), Johnson et al.

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