Seawater probe

Details Seawater probe Seawater probe

1987-05-18

1989-08-08

Yasich, Daniel M.

Thermal measuring and testing

Temperature measurement

Geophysical

73170A, 73300, 374 1, G01D 302, G01K 1300

Patent

active

048547280

ABSTRACT:
A seawater probe for measuring a physical parameter which includes a sensor element having an electrical characteristic dependent on the parameter and a detector circuit for deriving a measurement signal corresponding to a measured value of the electrical characteristic, the improvement including a reference element having a known, stable value of the electrical characteristic connected in series with the sensor element, the reference and sensor elements being powered by a single power supply, means for selectively connecting the sensor and reference elements separately in the detector circuit, and means for calibrating the detector circuit using the known value of the electrical characteristic of the reference element and the measurement signal derived when the reference element is in the detector circuit.

REFERENCES:
patent: 2750794 (1956-06-01), Downs
patent: 2756404 (1956-07-01), Anderson et al.
patent: 3147431 (1964-09-01), Bennett et al.
patent: 3483749 (1969-12-01), Francis
patent: 3675484 (1972-07-01), Pederson
patent: 3748899 (1973-07-01), Gregg et al.
patent: 3991623 (1976-11-01), Murdock
patent: 4041382 (1977-08-01), Washburn
patent: 4122719 (1978-10-01), Carlson et al.
patent: 4324138 (1982-04-01), Davis et al.
patent: 4359285 (1982-11-01), Washburn
patent: 4562554 (1985-12-01), Stixrud et al.

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