Self-calibrated subcarrier telemetry system

Details Self-calibrated subcarrier telemetry system Self-calibrated subcarrier telemetry system

1979-03-22

1980-09-30

Pitts, Harold I.

Communications: electrical

Digital comparator systems

340209, G01D 712

Patent

active

042258510

ABSTRACT:
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.

REFERENCES:
Alan Adler, "Telemetry for Turbomachinery", Mar. 1979, Mechanical Engineering, pp. 30-35.
V. Donato, S. P. Davis, "Radio Telemetry--Turbines", Apr. 1973, Sound and Vibration, pp. 28-34.

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