Method and system for passive wireless strain gauge
First Claim
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1. A method of detecting the amount of deformation of an object using a strain gauge affixed to the object comprising the steps of:
- (a) transmitting a wireless RF signal to the gauge;
(b) receiving the RF signal at the gauge;
(c) shifting the RF frequency as a function of the deformation of the object;
(d) transponding the shifted RF frequency signal to an analyzer; and
(e) in the analyzer, determining a strain in the object as a function of the shift in RF frequency;
wherein the steps are performed without providing power to the gauge.
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Abstract
A system and method of using a passive wireless gauge to detect the physical properties on an object.
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Citations
18 Claims
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1. A method of detecting the amount of deformation of an object using a strain gauge affixed to the object comprising the steps of:
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(a) transmitting a wireless RF signal to the gauge; (b) receiving the RF signal at the gauge; (c) shifting the RF frequency as a function of the deformation of the object; (d) transponding the shifted RF frequency signal to an analyzer; and (e) in the analyzer, determining a strain in the object as a function of the shift in RF frequency; wherein the steps are performed without providing power to the gauge. - View Dependent Claims (2, 3, 4, 5, 6, 7)
(ii) creating at least one harmonic of the selected frequencies;
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5. The method of claim 4 wherein the step of transmitting the shifted RF frequency includes transponding the selected frequencies and at least one harmonic as a wireless signal to an analyzer.
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6. The method of claim 5 wherein the step of determining a strain comprises the steps of:
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(i) isolating the at least one harmonic from the transponded signal; and (ii) estimating the amount of strain as a function of the isolated harmonic.
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7. The method of claim 6 wherein the step of estimating comprises:
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(a) estimating the peak value of the harmonic; (b) determining a shift in capacitance as a function of the estimated peak; and (c) measuring the strain as a function in the shift in capacitance.
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8. A system for determining the strain in a rotating object comprising:
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a transceiver for transmitting and receiving a wireless wideband signal; a signal processor that provides an estimate of strain as a function of a received wireless wideband signal; a passive strain gauge affixed to a rotating object comprising; a wideband antenna; a series RLC circuit; a diode frequency doubler; - View Dependent Claims (9, 10, 11)
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12. A method of detecting the amount of strain in a rotating object where a strain gauge has bee affixed to the object comprising the steps of:
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(a) transmitting a wireless wideband signal to the gauge; (b) receiving the broadband signal at the gauge and performing the following steps; (i) passing selected frequencies from the wideband signal; (ii) creating at least one harmonic of the selected frequencies; (iii) transponding the selected frequencies and at least one harmonic as a wireless signal to an analyzer; (c) receiving the wireless transponded signals at the analyzer and performing the following steps; (i) isolating the at least one harmonic from the transponded signal; and (ii) estimating the amount of strain as a function of the isolated harmonic. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification