Method and apparatus for optically discriminating between the ph

Details Method and apparatus for optically discriminating between the ph Method and apparatus for optically discriminating between the ph

1997-05-22

1999-09-21

Kim, Robert H.

Optics: measuring and testing

Refraction testing

Refractive rod engages specimen

356135, 356136, G01N 2141

Patent

active

059561327

ABSTRACT:
To discriminate optically between the various phases in a three-phase fluid, a light beam (F) of non-zero divergence is injected into a detector block (10) made of a material whose refractive index is greater than the refractive indices of all three phases of the fluid. The block (10) has a sensitive zone (18) and a total reflection zone (20) such that incident rays (Ri) parallel to the axis (12) of the block strike the sensitive zone (17) at an angle of incidence (.THETA.i) and are returned parallel to the axis (12) by the total reflection zone (20). The angle of incidence (.THETA.i) is such that a first phase gives rise to almost total reflection, a second phase gives rise to almost total transmission, and a third phase gives rise to partial transmission and partial reflection.

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