Direction Detection Sensor Using Peak Detector
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Solution Overview
Problem
Conventional sensors require multiple magnetic field transducers or complex signal processing to detect target movement direction, and must be installed and maintained at precise angles, increasing cost and complexity.
Innovation Solution
A sensor using a single magnetic field transducer with a peak detector and comparator to generate output pulses of different widths based on target movement direction, allowing for accurate direction detection regardless of mounting angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic field transducers are used to detect target movement direction, then direction detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple transducer functions into a single magnetic field transducer by using signal processing circuits (peak detector, absolute value circuit, comparator) to extract directional information from the magnetic field signal, eliminating the need for multiple physical transducers while maintaining direction detection capability
Solution Approach 2:
The patent replaces the mechanical/physical arrangement of multiple transducers with an electronic signal processing system that analyzes the characteristics of the magnetic field signal to determine target movement direction, substituting physical complexity with electronic processing
2Measurement precision
If multiple magnetic field transducers are used to detect target movement direction, then direction detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple transducer components into a single transducer design, reducing component count and assembly requirements, which directly lowers manufacturing cost while maintaining direction detection functionality through electronic signal processing
Solution Approach 2:
The single magnetic field transducer is designed to perform multiple functions: detecting target presence, determining movement direction, and providing speed information, replacing what would traditionally require multiple specialized transducers and reducing overall system cost
3Measurement precision
If precise mounting angle is required for accurate direction detection, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements dynamic signal processing that adapts to the magnetic field signal characteristics regardless of mounting angle, using peak detection and waveform analysis to extract directional information from signals with varying amplitudes and shapes caused by different mounting orientations
Solution Approach 2:
The patent changes the approach from fixed geometric parameter dependence (mounting angle) to signal parameter analysis (peak detection, waveform characteristics), allowing the system to determine direction based on signal features rather than precise mechanical alignment
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 solution simplifies sensor design and installation, reducing costs and complexity while providing accurate direction and speed detection with reduced sensitivity to mounting orientation.
Implementation Method 1
a magnetic field transducer operative to provide a magnetic field signal proportional to a magnetic field associated with the detection target
Data Source
AI summary
A sensor responsive to movement of a detection target includes a magnetic field transducer operative to provide a magnetic field signal proportional to a magnetic field associated with the detection target, a peak detector for tracking positive and negative peaks of the magnetic field signal to generate a tracking signal, and a comparator having a first input responsive to the magnetic field signal, a second input responsive to an input signal related to the tracking signal, and an output at which is provided an output signal comprising first pulses having a first pulse width when the detection target moves in a first direction and second pulses having a second pulse width when the detection target moves in a second direction.