Strain gage transducer with impedance means for compensating for the characteristic nonlinearity of the gage
First Claim
1. CONDITION-RESPONSIVE APPARATUS HAVING ITS CONDITION RESPONSE VARIED TO A DESIRED DEGREE AS A FUNCTION OF THE MAGNITUDE OF THE CONDITION ITSELF SO AS TO EFFECT THE LINEARITY OF ITS CONDITION RESPONSE COMPRISING, IN COMBINATION, AN ELECTRICAL NETWORK INCLUDING A FIRST ELECTRICAL IMPEDANCE ELEMENT WHOSE IMPEDANCE VARIES IN ACCORDANCE WITH THE VARIATION OF THE CONDITION TO BE MEASURED, SAID NETWORK HAVING A PAIR OF INPUT AND A PAIR OF OUTPUT TERMINALS, A SOURCE OF VOLTAGE IMPRESSED UPON SAID INPUT TERMINALS, WHEREBY A VARIATION OF SAID CONDITION RESULTS IN A CORRESPONDING VARIATION OF THE VOLTAGE APPEARING ACROSS SAID OUTPUT TERMINALS, A SECOND ELECTRICAL IMPEDANCE ELEMENT WHOSE IMPEDANCE VARIES IN ACCORDANCE WITH THE VARIATION OF THE SAME CONDITION TO BE MEASURED, SAID SECOND IMPEDANCE ELEMENT BEING EXTERNAL OF SAID NETWORK AND BEING CONNECTED TO ONE OF SAID PAIRS OF TERMINALS SAID NETWORK SO THAT SUCH VARIATION IN THE SECOND IMPEDANCE IN RESPONSE TO SAID CONDITION EFFECTS A CORRESPONDING VARIATION IN THE MAGNITUDE OF THE RESPONSE OF SAID NETWORK TO THE CONDITION-RESPONSIVE CHANGES IN THE FIRST IMPEDANCE ELEMENT INCLUDED THEREIN, SAID SECOND ELEMENT HAVING THE MAGNITUDE OF ITS CONDITION-RESPONSIVE VARIATION IN IMPEDANCE PREDETERMINED TO BE IN EXCESS OF THAT REQUIRED FOR OBTAINING SAID DESIRED DEGREE OF VARIATION, AND MEANS FOR REDUCING THE EXTENT TO WHICH THE VARIATION IN IM PEDANCE OF SAID SECOND IMPEDANCE ELEMENT EFFECTS SAID CORRESPONDING VARIATION IN RESPONSE OF SAID NETWORK TO OBTAIN THE DESIRED DEGREE OF VARIATION OF THE CONDITION RESPONSE OF SAID APPARATUS.
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1 Claim
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1. CONDITION-RESPONSIVE APPARATUS HAVING ITS CONDITION RESPONSE VARIED TO A DESIRED DEGREE AS A FUNCTION OF THE MAGNITUDE OF THE CONDITION ITSELF SO AS TO EFFECT THE LINEARITY OF ITS CONDITION RESPONSE COMPRISING, IN COMBINATION, AN ELECTRICAL NETWORK INCLUDING A FIRST ELECTRICAL IMPEDANCE ELEMENT WHOSE IMPEDANCE VARIES IN ACCORDANCE WITH THE VARIATION OF THE CONDITION TO BE MEASURED, SAID NETWORK HAVING A PAIR OF INPUT AND A PAIR OF OUTPUT TERMINALS, A SOURCE OF VOLTAGE IMPRESSED UPON SAID INPUT TERMINALS, WHEREBY A VARIATION OF SAID CONDITION RESULTS IN A CORRESPONDING VARIATION OF THE VOLTAGE APPEARING ACROSS SAID OUTPUT TERMINALS, A SECOND ELECTRICAL IMPEDANCE ELEMENT WHOSE IMPEDANCE VARIES IN ACCORDANCE WITH THE VARIATION OF THE SAME CONDITION TO BE MEASURED, SAID SECOND IMPEDANCE ELEMENT BEING EXTERNAL OF SAID NETWORK AND BEING CONNECTED TO ONE OF SAID PAIRS OF TERMINALS SAID NETWORK SO THAT SUCH VARIATION IN THE SECOND IMPEDANCE IN RESPONSE TO SAID CONDITION EFFECTS A CORRESPONDING VARIATION IN THE MAGNITUDE OF THE RESPONSE OF SAID NETWORK TO THE CONDITION-RESPONSIVE CHANGES IN THE FIRST IMPEDANCE ELEMENT INCLUDED THEREIN, SAID SECOND ELEMENT HAVING THE MAGNITUDE OF ITS CONDITION-RESPONSIVE VARIATION IN IMPEDANCE PREDETERMINED TO BE IN EXCESS OF THAT REQUIRED FOR OBTAINING SAID DESIRED DEGREE OF VARIATION, AND MEANS FOR REDUCING THE EXTENT TO WHICH THE VARIATION IN IM PEDANCE OF SAID SECOND IMPEDANCE ELEMENT EFFECTS SAID CORRESPONDING VARIATION IN RESPONSE OF SAID NETWORK TO OBTAIN THE DESIRED DEGREE OF VARIATION OF THE CONDITION RESPONSE OF SAID APPARATUS.
Specification
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Current AssigneeArthur C. Ruge
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Original AssigneeArthur C. Ruge
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InventorsRuge, Arthur C.
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Application NumberUS04/115,837Time in Patent Office1,768 DaysField of SearchUS Class Current73/862.622CPC Class CodesG01L 1/2275 for non linearity
