Measuring and testing – Liquid level or depth gauge – With illumination
Patent
1994-06-28
1997-02-25
O'Shea, Sandra L.
Measuring and testing
Liquid level or depth gauge
With illumination
250901, G03F 2300
Patent
active
056061250
ABSTRACT:
An optical temperature compensated material level-interface sensing and control system which comprises an insertion probe (10), control circuitry and a housing enclosure (72). The probe (10) makes use of a pair of emitters and detectors, in which one pair is positioned across a channel (26) through which material passes and the other pair are mounted in a sealed tubular bracket. The first emitter and detector pair are optically active with respect to sensed material, and the other pair is optically isolated, but thermally active. The resulting signal is a function of the material's linear coefficient of absorption with the thermal influence being effectively canceled out. The outputs of the control circuit are user selectable and changeable. The device is able to detect material presence and identity for use in interface-level control applications through a wide range of pressures and temperatures in industrial applications.
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Lyons Kevin
Lyons Steven
Dougherty Elizabeth L.
O'Shea Sandra L.
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