Inductive Proximity Sensor Signal Compensation for Environmental Stability
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Solution Overview
Problem
Inductive proximity sensors face challenges in maintaining consistent detection accuracy due to changes in coil properties and external disturbances such as electromagnetic noise and temperature variations, which affect the detection distance and reliability.
Innovation Solution
The proximity sensor employs a controller that acquires and compensates for factors influencing detection by analyzing time series signals during both excitation and block periods, subtracting signals related to coil inductance and resistance changes to stabilize the detection signal, thereby reducing the impact of coil property variations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection coil is used to generate a magnetic field for detecting metal objects, then the sensor can detect the presence and position of detection bodies, but the coil properties (inductance and resistance) change due to external magnetic fields and temperature, causing detection distance variation
Solution Approach 1:
The patent applies preliminary action by measuring the coil's inductance and resistance values before the actual detection process to establish baseline characteristics. These pre-measured values are stored and used for subsequent compensation calculations, allowing the system to account for environmental variations before they affect detection accuracy.
Solution Approach 2:
The patent implements feedback by continuously monitoring the coil's inductance and resistance changes during operation and using these measurements to compensate the detection results. The system feeds back the environmental influence data to adjust the detection distance calculation, thereby maintaining accuracy despite temperature and magnetic field variations.
2Adaptability or versatility
If electromagnetic noise and external magnetic fields are present in the environment, then the sensor can operate in real-world conditions, but the detection signal is affected by noise causing inaccurate detection results
Solution Approach 1:
The patent converts the harmful effect of electromagnetic noise and external magnetic fields into useful information by measuring their impact on the coil's electrical characteristics. The noise-induced changes in inductance and resistance are measured and used as compensation data, transforming environmental interference into corrective information that improves detection accuracy.
Solution Approach 2:
The patent introduces an intermediary measurement process that detects the coil's electrical parameter changes as a mediator between the external noise environment and the final detection result. This intermediary measurement of inductance and resistance serves as a bridge to compensate for noise effects before determining the actual detection distance.
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
This approach enhances the sensor's ability to accurately detect the presence and position of metal objects by minimizing the influence of coil property changes and noise, ensuring stable performance across varying environmental conditions.
Implementation Method 1
a detection coil that generates a magnetic field
Implementation Method 2
detects voltages or currents generated at both ends of the detection coil by the periodic supply of the excitation current
Data Source
AI summary
A proximity sensor includes a transmission circuit that periodically supplies an excitation current in a pulse form to a detection coil for generating a magnetic field, a reception circuit that detects voltages or currents generated at both ends of the detection coil by the periodic supply of the excitation current, and a controller that detects presence or a position of the detection body by utilizing a time series signal obtained by the detection. The controller acquires a factor that influences the detection of the detection body in a first period of the time series signal. The controller compensates a signal in a second period of the time series signal by the factor. The controller detects the presence or the position of the detection body on the basis of a signal after the compensation.