Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-05-16
1989-07-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356436, H01J 516
Patent
active
048516651
ABSTRACT:
The system for sensing ions in aqueous solution such as an electroplating bath includes a light source (18) which delivers light including a selected wavelength through a series of optical fibers (20, 24, 26, 32) to probe (14). The probe is partially immersed in the solution (12) and the light is delivered through the solution in the space (94) between prisms (82, 92). The return light is conducted by optical fibers (32,38) to detector or opto-electronic transducer (44). A portion of the original light is diverted by splitter (22) through fiber (42) to opto-electronic transducer (46) so that a comparison of the signals determines the amount of light in selected wavelength which is absorbed in the solution due to ions thereon. The signal processing unit (40) is preferably enclosed in an electromagnetic protected area (16) to avoid the adverse EMI and corrosive atmosphere effects near the electroplating tank (10).
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Pesavento Philip V.
Strawbridge Joy W.
Alkov Leonard A.
Hughes Aircraft Company
Karambelas A. W.
Nelms David C.
Shami Khaled
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