Train gage measurement circuit for high temperature applications

Details Train gage measurement circuit for high temperature applications Train gage measurement circuit for high temperature applications

1981-05-11

1983-11-29

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

324DIG1, G01B 718

Patent

active

044174772

ABSTRACT:
A Wheatstone bridge circuit for a strain gage designed to eliminate the zero offset due to heated cables occurring when the active elements of the bridge circuit are elevated to high temperatures. The bridge circuit comprises an active, a dummy and two completion resistors and is distinguished from conventional bridge circuits in that the resistance of the completion resistors substantially exceeds the value of any other resistors in the bridge circuit. The cables are used to connect the active and dummy resistors which are at the elevated temperatures to the completion resistors which are at room temperature. Heat induced resistance changes in the cables normally produce the zero offset because the cables form a part of the bridge circuit and are heated unevenly; however, the high value of completion resistors incorporated in the present invention tend to nullify the resistance changes in the cables and thereby eliminate the zero offset.

REFERENCES:
patent: 3453536 (1969-07-01), Lode

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