Angle Detecting Device High-Speed Measurement
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Solution Overview
Problem
Existing angle detection technologies, such as absolute encoders in total stations and incremental encoders in laser scanners, face limitations in speed and resolution, with absolute encoders being slow and incremental encoders providing low resolution, making them unsuitable for high-speed angle measurements.
Innovation Solution
An angle detecting device comprising absolute encoders on a rotation member, a clock signal generating component, a counter circuit, and a trigger signal generating component, which inputs angle trigger signals at predetermined intervals to detect rotation angles accurately even at high speeds by combining the rotation angles from absolute encoders with clock counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an absolute encoder is used for angle measurement, then measurement accuracy and reliability are improved, but detection speed deteriorates
Solution Approach 1:
The system dynamically switches between two detection modes: using absolute encoders when rotation speed is below a threshold (prioritizing accuracy) and using incremental encoder with frequency-to-angle conversion when rotation speed exceeds the threshold (prioritizing speed). This dynamic adaptation resolves the contradiction by selecting the appropriate detection method based on real-time rotation conditions.
Solution Approach 2:
The system changes the detection parameter (detection method) based on rotation speed. When rotation speed is low, absolute encoder detection is used; when rotation speed is high, incremental encoder detection with frequency-to-angle conversion is used. This parameter change allows the system to optimize performance for different operating conditions, resolving the speed-accuracy tradeoff.
2Speed
If an incremental encoder is used for high-speed rotation, then detection speed is improved, but angle signal resolution deteriorates
Solution Approach 1:
The frequency-to-angle conversion unit acts as an intermediary that processes the low-resolution incremental encoder signals. By converting pulse frequency to angle information using the known rotation speed relationship, it transforms the low-resolution angle signals into high-precision angle measurements, effectively resolving the resolution limitation of incremental encoders at high speeds.
Solution Approach 2:
The system replaces direct mechanical angle reading (which is limited by encoder resolution) with a computational approach. The frequency-to-angle conversion unit uses mathematical relationships between pulse frequency, rotation speed, and angle to calculate precise angle values, substituting mechanical reading limitations with computational precision.
3Productivity
If the rotation member rotates at high speed exceeding encoder detection capability, then productivity is improved, but measurement reliability deteriorates
Solution Approach 1:
The system dynamically adjusts the detection method based on rotation speed. When rotation speed exceeds the absolute encoder's detection capability, the system switches to incremental encoder detection with frequency-to-angle conversion, maintaining reliable angle measurement even at high scanning speeds that would otherwise cause detection failures.
Data Source
AI summary
The invention provides an angle detecting device, which comprises absolute encoders provided on a rotation member which rotates at a constant speed, a clock signal generating component, a counter circuit, an angle calculating component, and a trigger signal generating component, wherein an angle trigger signal is inputted to the absolute encoders and the counter circuit at a predetermined time interval, the absolute encoders input rotation angles for each angle trigger signal to the angle calculating component, the counter circuit outputs the number of clock counts to the angle calculating component from the moment when a rotation angle measuring trigger signal is inputted by inputting the rotation angle measuring trigger signal for detecting the rotation angle of the rotation member to the counter circuit, and wherein the angle calculating component detects the rotation angle of the rotation member based on the rotation angles from the absolute encoders and on the number of the clock counts.