Accession Number : ADD014297

Title :   Liquid Level Measurement System for Analog and Digital Readout.

Descriptive Note : Patent, Filed 27 Jun 88, patented 15 Aug 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Dahl, Ernest A

Report Date : 15 Aug 1989

Pagination or Media Count : 6

Abstract : An elongated level sensor system has an optical prism formation moulded or cut in a side, and includes a plurality of LED light sources and corresponding photo cells positioned along its length. Light from the LED sources are reflected off the prism surfaces to respective photocells when there is no liquid present in the area, thereby indicating 'no liquid media present'. When liquid surrounds a particular section, light from the LED is not reflected from the prism surfaces, but is refracted out; the change in photocell voltage then indicates the presence of liquid storage areas, and read out simultaneously at a remote sensor/alarm panel. Patents. (jhd)

Descriptors :   *LIQUID LEVEL GAGES, *PATENTS, *PHOTOELECTRIC CELLS(SEMICONDUCTOR), OPTICAL DETECTORS, LIGHT SOURCES, LIQUIDS, PANELS, PRISMS(OPTICS), READ OUT TECHNIQUES, REMOTE DETECTORS, STORAGE TANKS, SURFACES, VOLTAGE, WARNING SYSTEMS

Subject Categories : Test Facilities, Equipment and Methods
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE