Displacement Sensor Gap Error Compensation Using Asymmetric Coils
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Solution Overview
Problem
Existing displacement sensors face challenges in accurately detecting displacement due to gap errors between the coupler element and the transmitting or receiver coils, which can occur due to production deviations, affecting the reliability of displacement measurements.
Innovation Solution
A displacement detection apparatus and method utilizing multiple receiver coils with different winding directions, a processor to receive and process signals, and a signal processing unit to compensate for gap errors by selecting appropriate receiver signals, thereby improving displacement detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single receiver coil is used to detect displacement, then the device complexity is low, but the measurement precision deteriorates due to gap errors
Solution Approach 1:
The receiver coil is divided into multiple segments (first receiver coil and second receiver coil) with different winding directions. Each segment responds differently to the coupler element's position, allowing the system to distinguish between actual displacement and gap variations by comparing the differential signals from each segment.
Solution Approach 2:
The first and second receiver coils are designed with asymmetric winding directions (e.g., clockwise and counter-clockwise). This asymmetry causes the coils to generate different signal responses when the coupler element moves versus when gap variations occur, enabling the system to identify and compensate for gap errors through signal differential processing.
2Measurement precision
If multiple receiver coils with different winding directions are used, then the measurement precision improves by compensating for gap errors, but the device complexity increases
Solution Approach 1:
The signals from multiple receiver coils are merged and processed together to generate a differential signal. By combining the outputs of the first and second receiver coils and comparing their responses, the system extracts displacement information while canceling out common-mode gap errors, achieving high precision without requiring complex individual coil designs.
Solution Approach 2:
The system uses feedback processing where the differential signal from multiple receiver coils is continuously monitored and processed to compensate for gap errors. The processor analyzes the signal variations and adjusts the displacement measurement in real-time based on the detected gap conditions, improving accuracy through continuous error correction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively compensates for gap errors, enhancing the accuracy and reliability of displacement detection by using the structure of multiple receiver coils and a signal processing unit to generate and apply compensation signals, ensuring precise displacement measurement.
Implementation Method 1
a transmitting coil or an exciter coil is excited by a high-frequency source, and then the transmitting coil generates electromagnetic radiation
Implementation Method 2
the receiver coil generates an output signal due to inductive coupling to the transmitting coil
Data Source
AI summary
Disclosed herein are a displacement sensor and a displacement detection apparatus and method. The displacement detection apparatus according to an embodiment of the present invention includes a receiving unit for receiving a plurality of receiver signals dependent on displacement of a coupler element, an acquisition unit for acquiring information about the displacement of the coupler element and information about a gap between the coupler element and a transmitting coil or the plurality of receiver coils by using the plurality of receiver signals, and a compensation unit for compensating for the acquired displacement information using the acquired gap information. The acquisition unit acquires the displacement information of the coupler element using one of the plurality of receiver signals, and acquires a compensation signal, independent of the displacement of the coupler element including the gap information, using remaining receiver signals.