Rotating Body Sensing via Differential Signal Processing
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Solution Overview
Problem
Existing sensing technologies for rotating bodies face challenges in accurately detecting minute displacements and rotation angles, particularly in miniature forms with slim profiles, due to limitations in detecting pattern changes and rotation information calculation.
Innovation Solution
An apparatus comprising a unit with first and second pattern portions and a sensor module with first and second sensors, where a rotation information calculator differentiates output signals to calculate difference values and compares them with varied comparison values based on a target sensing angle, size, and angle ratio, enabling precise detection of rotation angles and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensor is used to detect rotation, then the device structure is simple, but the measurement precision of rotation angle and direction is insufficient
Solution Approach 1:
The sensing system is segmented into multiple independent sensors (first sensor and second sensor) positioned at different angular locations. Each sensor independently detects pattern changes at its specific position, and the rotation information calculator processes signals from multiple sensors to determine both rotation angle and direction, thereby improving measurement precision through multi-point detection
Solution Approach 2:
The detection system transitions from single-dimensional (one sensor) to multi-dimensional detection by positioning sensors at different angular positions around the rotating body. This spatial dimensionality enhancement allows simultaneous detection of rotation angle magnitude and rotation direction, resolving the limitation of single-sensor systems
2Volume of moving object
If the sensing apparatus is miniaturized for slim profile applications, then the device size is reduced, but the ability to detect minute displacements deteriorates
Solution Approach 1:
The pattern portions are designed with specific local geometric characteristics (pattern shape, size, and angular positioning) that are optimized for high-precision detection. The first and second pattern portions are positioned at specific angular intervals (e.g., 90 degrees) and have dimensions tailored to enhance sensitivity to minute rotational displacements, allowing accurate detection despite miniaturization
Solution Approach 2:
The system performs preliminary signal processing by calculating difference values between sensor outputs before final rotation angle determination. This preliminary differentiation of sensor signals enhances the detection of minute displacement changes, maintaining measurement precision even in miniaturized configurations where displacement magnitudes are small
3Measurement precision
If multiple sensors are used to improve detection accuracy, then the measurement precision increases, but the device complexity increases
Solution Approach 1:
The system replaces complex mechanical sensing mechanisms with an optical/electromagnetic field-based detection approach. Sensors detect changes in optical or electromagnetic fields caused by pattern portions, and rotation information is calculated through signal processing algorithms rather than mechanical linkages, reducing physical device complexity while maintaining high measurement precision
Solution Approach 2:
The rotation information calculator dynamically adjusts calculation parameters (comparison values) based on the target sensing angle and pattern dimensions. By changing computational parameters rather than physical hardware configuration, the system adapts to different detection requirements without increasing device complexity, maintaining precision through software-based flexibility
Data Source
AI summary
An apparatus for sensing a rotating body includes a unit to be detected, including a first pattern portion having at least one first pattern and a second pattern portion having at least one second pattern, and configured to rotate around a rotating shaft, a sensor module comprising a first sensor disposed opposite to the first pattern portion and a second sensor disposed opposite to the second pattern portion, and a rotation information calculator configured to calculate a difference value by differentiating output signals of the first sensor and the second sensor, and to compare comparison values, determined according to a target sensing angle and a size of the first pattern and the second pattern, with the difference value.