Temperature measurement

Details Temperature measurement Temperature measurement

1979-03-28

1980-07-08

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

364557, G01K 702

Patent

active

042111137

ABSTRACT:
In a temperature measurement region, a thermocouple and a reference voltage source in turn supply voltages via solid state switches to the center-tapped primary winding of a transformer. The output voltages of the transformer secondary winding are applied via an analogue-to-digital converter to a crystal-clock-regulated digital processing unit that obtains the difference of positive and negative voltages derived from the thermocouple signal, the positive and negative voltages derived from the reference voltage, for subsequent ratiometric processing. The switches are operated by a switch control unit that responds to signals arriving via electrically-isolating transducers from switch control latches that receive switch control outputs from the digital processing unit.

REFERENCES:
patent: 3459925 (1969-08-01), Goosey et al.
patent: 4126826 (1978-11-01), Dobkin

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