Proximity Sensor Temperature Compensation via Characteristic Parameters
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Solution Overview
Problem
Existing proximity sensors face challenges in improving detection precision and expanding detectable range due to variations in component characteristics and manufacturing processes, despite temperature compensation methods, which do not adequately address these issues.
Innovation Solution
A method and manufacturing system for proximity sensors that include a detection coil, capacitor, oscillation circuit, temperature detection, and control calculation parts, where the sensors are exposed to various temperatures to determine unique characteristic parameters, allowing for precise temperature compensation and improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature compensation circuit is introduced to improve detection precision, then detection precision is improved, but device complexity increases
Solution Approach 1:
The proximity sensor uses its own detection coil signal to compensate for temperature effects. The control calculation unit analyzes the detection coil's impedance changes and automatically compensates for temperature drift without requiring external temperature sensors or additional compensation circuits, making the system self-sufficient and avoiding increased complexity
Solution Approach 2:
The invention changes the operating parameters of the detection coil by adjusting its impedance characteristics based on temperature variations. The control calculation unit modifies the detection parameters dynamically to maintain optimal detection precision across different temperatures, avoiding the need for complex hardware compensation circuits
2Measurement precision
If individual sensors are calibrated at multiple temperatures to determine unique characteristic parameters, then detection precision and uniformity are improved, but manufacturing time and productivity are reduced
Solution Approach 1:
The calibration process is performed during the manufacturing stage rather than during field use. Unique characteristic parameters are determined in advance for each sensor through automated multi-temperature calibration, and these parameters are stored for later use. This preliminary action ensures high detection precision without requiring time-consuming calibration during actual operation
Solution Approach 2:
The invention uses parameter transformation to convert the multi-temperature calibration data into compact characteristic parameters that can be stored and reused. By changing the representation form from raw calibration data to condensed characteristic parameters, the manufacturing process becomes more efficient while maintaining high detection precision
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 detection precision and expands the detectable range by compensating for temperature-dependent variations in detection characteristics, ensuring uniform detection performance across different sensors.
Implementation Method 1
high frequency waves are radiated from primary coils and detection is executed based on changes in waveforms occurring in secondary coils
Implementation Method 2
an oscillation circuit that excites the detection part
Data Source
AI summary
A method of manufacturing a proximity sensor and a manufacturing system for the proximity sensor capable of improving detection precision or expanding a detectable range are provided. A method of manufacturing a proximity sensor outputting presence or absence of a detection object or a position of the detection object as a detection result is provided. The manufacturing method includes: disposing the proximity sensor in a temperature-changeable environment; setting an environment of the proximity sensor to a plurality of different temperatures respectively and storing temperature detected by the temperature detection part of the proximity sensor in association with the detection result output by the control calculation part at each temperature; determining a characteristic parameter unique to a target proximity sensor based on the stored temperature and detection result; and setting the determined characteristic parameter for the target proximity sensor.