Ultra-High Temperature Distributed Wireless Sensors
First Claim
1. A wireless sensor comprising:
- a measuring member which is sensitive to a measurand and a frequency selective member positioned proximate to each other, wherein the frequency selective member comprises a preselected resonance frequency, such that it scatters at least a portion of an interrogating signal as a scattered signal proximate to its resonance frequency and wherein the measuring member dampens the scattered signal as a function of the measurand to change the quality (Q) factor of the scattered signal, and wherein the wireless sensor is passive.
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Abstract
A passive wireless sensor is disclosed. The sensor has at least a measurand sensitive member and an electromagnetically resonant member positioned proximate to each other. The resonant member comprises a preselected resonance frequency, such that it scatters at least a portion of an interrogating signal as a scattered signal proximate to its resonance frequency, and the measurand sensitive member alters the scattered signal as a function of the measurand to change the shape of the scattered signal. The reactive field of the sensor is kept within the sensor to minimize environment interference and to maximize its signal strength. Almost bond-free packaging mitigates problems with delamination or internal stresses due to differing coefficients of thermal expansion.
26 Citations
20 Claims
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1. A wireless sensor comprising:
a measuring member which is sensitive to a measurand and a frequency selective member positioned proximate to each other, wherein the frequency selective member comprises a preselected resonance frequency, such that it scatters at least a portion of an interrogating signal as a scattered signal proximate to its resonance frequency and wherein the measuring member dampens the scattered signal as a function of the measurand to change the quality (Q) factor of the scattered signal, and wherein the wireless sensor is passive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- 19. A wireless sensor comprising a metal grating, wherein the metal is preselected so that its conductivity is measurably sensitive to the range of temperature to be measured, and wherein the metal grating comprises a plurality of gratings such that the metal grating comprises a preselected resonance frequency, such that it scatters at least a portion of an interrogating signal as a scattered signal proximate to its resonance frequency and wherein the metal grating dampens the scattered signal as a function of temperature to change the quality (Q) factor of the scattered signal, and wherein the wireless sensor is passive.
Specification