Non-linearity compensation means for electrical strain gage transducer

Claim 1

STRAIN GAGE TRANSDUCER APPARATUS HAVING ITS RESPONSE TO LOAD VARIED TO A DESIRED DEGREE AS A FUNCTION OF THE MAGNITUDE OF THE LOAD ON A MEMBER SO AS TO HAVE A SUBSTANTIALLY LINEAR RESPONSE, COMPRISING, IN COMBINATION, AN ELECTRICAL NETWORK INCLUDING FIRST ELECTRICAL STRAIN GAGE MEANS RESPONSIVE TO THE LOAD ON THE MEMBER AND EXHIBITING RESISTANCE WHICH INCREASES NON-LINEARLY TO A GIVEN EXTENT IN RESPONSE TO AN INCREASE OF THE LOAD, SECOND ELECTRICAL STRAIN GAGE MEANS RESPONSIVE TO THE LOAD ON THE SAME MEMBER AND EXHIBITING RESISTANCE WHICH DECREASES NON-LINEARLY TO A DIFFERENT EXTENT IN RESPONSE TO SAID INCREASE OF THE LOAD, SAID NETWORK HAVING TWO INPUT AND TWO OUTPUT TERMINALS, A SOURCE OF VOLTAGE IMPRESSED UPON SAID INPUT TERMINALS, AND MEANS ELECTRICALLY CONNECTING SAID FIRST AND SECOND STRAIN GAGE MEANS IN A CIRCUIT RELATIONSHIP WITHIN SAID NETWORK WHEREIN A VARIATION IN THE LOAD RESULTS IN A CORRESPONDING VARIATION OF THE VOLTAGE APPEARING ACROSS SAID OUTPUT TERMINALS AS A FUNCTION OF THE ALGEBRAIC DIFFERENCE OF THE RESPONSES OF SAID FIRST AND SECOND STRAIN GAGE MEANS, AND A SUBSTANTIALLY CONSTANT IMPEDANCE ELEMENT DIRECTLY CONNECTED TO ONE OF SAID FIRST AND SECOND STRAIN GAGE MEANS AND REDUCING BY A PREDETERMINED AMOUNT THE CONTRIBUTION OF SAID ONE OF SAID STRAIN GAGE MEANS TO SAID CORRESPONDING VARIATION RELATIVE TO THAT OF THE OTHER OF SAID STRAIN GAGE MEANS, WHEREBY THE RESPONSE OF THE APPARATUS IS ADJUSTED TO BE IN SUBSTANTIALLY LINEAR RELATIONSHIP TO THE LOAD BY SAID SUBSTANTIALLY CONSTANT IMPEDANCE ELEMENT.