Self-Calibrating Clearance Sensor Offset Correction
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Solution Overview
Problem
Current sensor systems, particularly two-channel differential sensing systems, face challenges in maintaining measurement accuracy over time due to temperature effects and long-term drifts, requiring frequent lab calibration and lacking mechanisms for detecting and correcting channel mismatches without human intervention.
Innovation Solution
A self-calibration system for multiple channel clearance sensors that includes a sensor for measuring clearance parameters, an offset correction section, a level shifter, an amplifier, and a signal level analyzer to determine and correct channel gain discrepancies, allowing for periodic and dynamic adjustment of channel gains and offset errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensated components and very low drift components are used, then the variation in response is reduced, but no provision is made for detecting and correcting drifts and variations over time and temperature
Solution Approach 1:
The system performs self-calibration by automatically detecting channel mismatches and correcting gain errors without external intervention. The calibration section monitors its own performance and adjusts parameters dynamically, eliminating the need for manual lab calibration while maintaining measurement accuracy over time and temperature variations.
Solution Approach 2:
The system implements feedback mechanisms where the calibration section continuously monitors the response of multiple channels, detects discrepancies, and automatically adjusts gain parameters to correct mismatches. This closed-loop feedback ensures long-term measurement precision without requiring complex manual calibration procedures.
2Measurement precision
If frequent lab calibration is performed, then measurement accuracy is maintained, but the system requires disassembly and human intervention
Solution Approach 1:
The calibration system operates autonomously within the sensor system itself, performing self-diagnosis and self-correction of channel mismatches. This eliminates the need for external lab calibration, disassembly, and human intervention while maintaining accurate clearance measurements in flight systems requiring years of service without maintenance.
Solution Approach 2:
The system dynamically adjusts calibration parameters in real-time based on detected channel variations due to temperature effects and drifts. This dynamic self-calibration capability allows the system to adapt to changing conditions without manual intervention, maintaining measurement accuracy throughout extended operational periods.
3Measurement precision
If channel gain matching is performed manually, then response matching is achieved, but the process is time-consuming and requires human intervention
Solution Approach 1:
The calibration section automatically performs gain matching by detecting discrepancies between channel responses and applying corrective gain adjustments without human intervention. This self-service calibration process eliminates time-consuming manual procedures while achieving precise channel response matching for accurate differential measurements.
Solution Approach 2:
The system replaces manual mechanical calibration procedures with automated electronic calibration circuits that detect and correct gain mismatches through electronic signal processing. This substitution of electronic automation for manual mechanical adjustment dramatically reduces calibration time and eliminates the need for human intervention while maintaining precise channel matching.
Data Source
AI summary
Self-calibration of a multiple channel clearance sensor system, which in one embodiment includes at least one sensor for measuring at least one clearance parameter signal between a stationary object and a rotating object of a rotating machine. The sensor output is processed as a clearance parameter by an offset correction section configured to determine an offset error in the clearance parameter signal which is used by a level shifter. The level shifter is also switchably coupled to the clearance parameter signal wherein the output of the level shifter, which may be amplified and digitally converted, is processed by a signal level analyzer to determine a channel gain signal.