Multi-level fiber-optic liquid-level sensing system

Details Multi-level fiber-optic liquid-level sensing system Multi-level fiber-optic liquid-level sensing system

1989-10-06

1990-12-25

Lee, John D.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 9615, 350 961, 250577, G02B 602, G01N 2126

Patent

active

049797972

ABSTRACT:
Plural sensor prisms and associated opticalfiber circuits are arrayed as a single vertical stem by which the individual prisms serve for response to each of a plurality of different liquid levels. Each prism is formed of light-transmitting plastic material which can be injection-molded to precision dimensions. The body configuration is such as to adapt to arrayed interconnection with tubular members, also of plastic, and bonded at telescoping fit of each prism to the tubular member or members to which it is connected. The prism configuration relied upon for sensed response to the presence of immersing liquid (as compared to air) is a solid region having an exterior profile which includes a downwardly convergent conical surface portion at least at spaced locales which are at equal but opposite offset from the cylindrical body axis, wherein the geometric apex angle of downward convergence is 90 degrees. As long as a given prism is exposed to air, a large amount of light is transmitted (by reflection within the prism) from a transmission optical fiber to a receiving optical fiber. But when immersed in a liquid, a portion of the light from the transmitting fiber is refracted into the liquid, resulting in a clearly detectable decrease in the amount of light coupled to the receiving fiber.

REFERENCES:
patent: 4155013 (1979-05-01), Spiteri
patent: 4156149 (1979-05-01), Vaccari
patent: 4329017 (1982-05-01), Kapany et al.
patent: 4707064 (1987-11-01), Dobrowoski et al.
patent: 4713552 (1987-12-01), Denis et al.

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