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Title: Oscillator detector

Abstract

An alien liquid detector employs a monitoring element and an oscillatory electronic circuit for maintaining the temperature of the monitoring element substantially above ambient temperature. The output wave form, eg., frequency of oscillation or wave shape, of the oscillatory circuit depends upon the temperaturedependent electrical characteristic of the monitoring element. A predetermined change in the output waveform allows water to be discriminated from another liquid, eg., oil. Features of the invention employing two thermistors in two oscillatory circuits include positioning one thermistor for contact with water and the other thermistor above the oil-water interface to detect a layer of oil if present. Unique oscillatory circuit arrangements are shown that achieve effective thermistor action with an economy of parts and energizing power. These include an operational amplifier employed in an astable multivibrator circuit, a discrete transistor-powered tank circuit, and use of an integrated circuit chip.

Inventors:
Publication Date:
OSTI Identifier:
5769929
Patent Number(s):
US 4202203
Assignee:
IFI; EDB-82-037361
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 26 Dec 1978
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 54 ENVIRONMENTAL SCIENCES; OIL SPILLS; DETECTION; WATER POLLUTION MONITORS; DESIGN; ELECTRONIC CIRCUITS; ENERGY EFFICIENCY; FREQUENCY MEASUREMENT; MONITORS; OSCILLATIONS; TEMPERATURE DEPENDENCE; THERMISTORS; EFFICIENCY; MEASURING INSTRUMENTS; SEMICONDUCTOR DEVICES; 020900* - Petroleum- Environmental Aspects; 520200 - Environment, Aquatic- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Potter, B.M.. Oscillator detector. United States: N. p., 1980. Web.
Potter, B.M.. Oscillator detector. United States.
Potter, B.M.. 1980. "Oscillator detector". United States. doi:.
@article{osti_5769929,
title = {Oscillator detector},
author = {Potter, B.M.},
abstractNote = {An alien liquid detector employs a monitoring element and an oscillatory electronic circuit for maintaining the temperature of the monitoring element substantially above ambient temperature. The output wave form, eg., frequency of oscillation or wave shape, of the oscillatory circuit depends upon the temperaturedependent electrical characteristic of the monitoring element. A predetermined change in the output waveform allows water to be discriminated from another liquid, eg., oil. Features of the invention employing two thermistors in two oscillatory circuits include positioning one thermistor for contact with water and the other thermistor above the oil-water interface to detect a layer of oil if present. Unique oscillatory circuit arrangements are shown that achieve effective thermistor action with an economy of parts and energizing power. These include an operational amplifier employed in an astable multivibrator circuit, a discrete transistor-powered tank circuit, and use of an integrated circuit chip.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1980,
month = 5
}