Thermal sensor

Details Thermal sensor Thermal sensor

1993-02-02

1994-02-22

Gutierrez, Diego F. F.

Measuring and testing

Moisture content or absorption characteristic of material

By heat conductivity

374 45, G01N 2556

Patent

active

052877345

ABSTRACT:
A sensor device is shown for detection of soil moisture levels using thermal diffusivity techniques. The sensor device has a porous media in a first zone, a heated temperature sensor arranged within the first zone, a second zone of a thermally conductive dense media containing a second reference temperature sensor, and leads connecting the sensors to a circuit to provide power to the heated temperature sensor and to the second reference temperature sensor. The circuit includes a comparator to compare outputs from the heated temperature sensor to the second reference temperature sensor so as to provide a signal indicative of soil moisture levels when the sensor device is operationally placed to receive soil moisture into the first zone.

REFERENCES:
patent: 2362344 (1944-11-01), Baver et al.
patent: 2718141 (1955-09-01), Richards
patent: 3553481 (1971-01-01), Hasenbeck
patent: 3847351 (1974-11-01), Hasenbeck
patent: 4059982 (1977-11-01), Bowman
patent: 4197866 (1980-04-01), Neal
patent: 4513608 (1985-04-01), Cuming
patent: 4845978 (1989-07-01), Whitford
patent: 4886088 (1989-12-01), Ryokai et al.

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