Composite shaft monitoring system
First Claim
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1. Apparatus for monitoring characteristics of a rotatable member, comprising:
- a sensor integratable with the rotatable member for producing an output related to a characteristic of the member, a sensing circuit integratable with the rotatable member and an interrogation circuit disposed externally the rotatable member;
said sensing circuit having a sense coil, and said interrogation circuit having an exciter coil magnetically coupled to said sense coil across a gap; and
control means for determining said sensor output as a function of an exciter coil current with compensation for said gap.
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Abstract
A smart structure comprising a rotatable shaft, and a sensor integrated with the shaft, a resonant detector circuit integrated with the structure for detecting a sensor output, and an external exciter circuit; the detector circuit having first coil means and the exciter circuit having second coil means magnetically coupled to the first coil means when aligned across a gap; and control means exterior the shaft for producing an output that corresponds to the sensor output compensated for the gap.
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Citations
23 Claims
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1. Apparatus for monitoring characteristics of a rotatable member, comprising:
- a sensor integratable with the rotatable member for producing an output related to a characteristic of the member, a sensing circuit integratable with the rotatable member and an interrogation circuit disposed externally the rotatable member;
said sensing circuit having a sense coil, and said interrogation circuit having an exciter coil magnetically coupled to said sense coil across a gap; and
control means for determining said sensor output as a function of an exciter coil current with compensation for said gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 23)
- a sensor integratable with the rotatable member for producing an output related to a characteristic of the member, a sensing circuit integratable with the rotatable member and an interrogation circuit disposed externally the rotatable member;
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15. A smart structure comprising a rotatable shaft, and a sensor integrated with the shaft, a resonant detector circuit integrated with the shaft for detecting a sensor output, and an external exciter circuit;
- said detector circuit having first coil means and said exciter circuit having second coil means magnetically coupled to said first coil means when aligned across a gap; and
control means exterior the shaft for determining said sensor output with condensation for said gap. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
- said detector circuit having first coil means and said exciter circuit having second coil means magnetically coupled to said first coil means when aligned across a gap; and
Specification