发明名称 |
Self-calibrated subcarrier telemetry system |
摘要 |
A self-calibrating subcarrier telemetry system for measuring strain on rotating members of a turbine under operating conditions. A rotor mounted portion of the system includes a strain gage transducer bridge excited by a subcarrier alternating current derived from an induced power source. The transducer bridge produces an output signal, amplitude modulated by the strain signal whereby the modulation shifts the strain signal into a higher frequency portion of the spectrum away from low-frequency noise related to the rotational speed of the turbine. A calibration signal is introduced by automatically unbalancing the bridge transducer periodically at a rate related to the subcarrier frequency. The strain signal is recovered in a stationary data reception portion of the system by a synchronous detector. A reference calibration signal is provided against which receiver gain is adjusted to achieve a null, leaving only the calibrated strain signal and achieving indpendence of variations in system gain. Nulling against the unipolar calibration reference further provides a means to distinguish tensile and compressive strain.
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申请公布号 |
US4225851(A) |
申请公布日期 |
1980.09.30 |
申请号 |
US19790023022 |
申请日期 |
1979.03.22 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
RESCHOVSKY, JOHN M.;WHIPPLE, III, WALTER |
分类号 |
G01D18/00;G01L1/22;H04B5/00;(IPC1-7):G01D7/12 |
主分类号 |
G01D18/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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