Self-balancing D.C.-substitution measuring system

Details Self-balancing D.C.-substitution measuring system Self-balancing D.C.-substitution measuring system

1975-06-17

1977-02-22

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

324 95, 324106, G01F 168, G01R 2102

Patent

active

040086100

ABSTRACT:
A self-balancing D.C.-substitution R.F. power measuring system includes ft and second high gain differential operational amplifiers, a bolometer element, and a reference resistor element. The amplifiers and the two elements are connected in a current loop with one of the elements connected between the output terminals from the differential amplifiers and the other of the elements connected between center points of isolated dual power supplies associated with each of the amplifiers. The inputs to one amplifier are connected from an adjacent end of one of the elements and the far end of the other element, while the inputs to the second amplifier are connected to the far end of the one element and the adjacent end of the other element. Current flows out of one amplifier and into the other. The current is driven to a value which maintains the potential between the input terminals of the first amplifier essentially equal to zero and the potential between the input terminals of the second amplifier essentially equal to zero. Thus, the current drives the value of the bolometer element to a resistance which is equal to the resistance of the reference element. An output connection to a voltmeter may be taken between corresponding ends of the elements. The bolometer element may be a thermistor or a barretter. The system may also be used in a hot-wire anemometer. In another version of the system, the current loop is established with one of the elements connected between the output of one amplifier and the center point of the power supply of the other amplifier and the other of the elements connected between the output of the other amplifier and the center point of the power supply of the one amplifier; the input connections to the amplifiers are taken from the same points, but with the input leads to the second amplifier interchanged.

REFERENCES:
patent: 2997652 (1961-08-01), Engen
patent: 3597676 (1971-08-01), Moore
patent: 3611130 (1971-10-01), Larsen et al.

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