Signal processing technique which separates signal components in a sensor for sensor diagnostics
AssigneeRosemount Inc.
InventorEvren Eryurek
Life of this patent
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Abstract
A device in the process control system includes a sensor input receiving a sensor signal. The sensor signal comprises a process variable signal and a residual sensor signal related to sensor operation. Diagnostic circuitry receives a separated sensor signal and responsively provides a diagnostic output related to the sensor. Sensor signal processing circuitry separates the sensor signal into signal components which are provided to the diagnostic circuitry.
Claims28
A device in a process control system, comprising:
- a sensor input receiving a sensor signal from a process variable sensor, the sensor signal comprising a composite signal which includes a process variable signal and a residual sensor signal related to sensor operation;
- sensor diagnostic circuitry which receives a separated sensor signal and responsively provides an output related to diagnostics of the process variable sensor;
- and
- wavelet preprocessing circuitry coupled to the sensor signal which separates signal components in the sensor signal and responsively provides the separated sensor signal to the sensor diagnostic circuitry.
A device in a process control system, comprising:
- a sensor input receiving a sensor signal from a process variable sensor, the sensor signal comprising a composite signal which includes a process variable signal and a residual sensor signal related to sensor operation;
- diagnostic circuitry which receives a separated sensor signal and responsively provides an output related to diagnostics of the process variable sensor;
- and
- wavelet preprocessing circuitry coupled to the sensor input which separates signal components in the sensor signal and responsively provides the separated sensor signal to the sensor diagnostic circuitry wherein the wavelet preprocessing circuitry operates over a data window comprising a portion of the sensor signal and signal padding between edges of the data window and the portion of the sensor signal.
A method in a process control for diagnosing operation of a process variable sensor, comprising:
- obtaining a sensor signal from a process variable sensor, the sensor signal comprising a composite signal which includes a process variable signal and a residual sensor signal, the residual sensor signal related to sensor operation;
- performing a wavelet transformation on the sensor signal and responsively providing a transformed output comprising a plurality of sensor signal components at least one of which includes the residual sensor signal;
- and
- diagnosing sensor operation in response to at least one of the plurality of sensor signal components from the wavelet transformation.
A method in a process control for diagnosing operation of a process variable sensor, comprising:
- obtaining a sensor signal from a process variable sensor, the sensor signal comprising a composite signal which includes a process variable signal and a residual sensor signal, the residual sensor signal related to sensor operation;
- performing a wavelet transformation on the sensor signal and responsively providing a transformed output comprising a plurality of sensor signal components at least one of which includes the residual sensor signal;
- and
- diagnosing sensor operation in response to at least one of the plurality of sensor signal components from the wavelet transformation wherein the wavelet transformation is performed over a data window, the method further including adding padding to the sensor signal near edges of the data window.
Dependencies are inferred from the claim text.