Door Sensor Angular Position Detection
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Solution Overview
Problem
Existing door sensors lack the ability to autonomously process the angle of rotation of a door leaf without external input, making them complex and costly for simple door control systems, and they often require intricate alignment procedures.
Innovation Solution
A door sensor system featuring a 3D image sensor and a 2-axis or 3-axis rotation angle sensor, such as a gyro sensor, mounted on a common carrier with a mounting plate that allows for easy alignment and installation on a swing door, eliminating the need for external input to process the door's angle of rotation and enabling recognition of its installation situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a door sensor uses external input to process the angle of rotation of the door leaf, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The door sensor autonomously determines the angle of rotation of the door leaf using its own 3D image sensor and coordinate system transformation algorithms, without requiring external input signals. The sensor performs self-calibration by detecting the door leaf's position in space and calculating rotation angles through coordinate transformations between the sensor's coordinate system and the door's coordinate system.
Solution Approach 2:
The patent replaces traditional mechanical angle encoders that require external input with an optical 3D image sensor system. The 3D image sensor captures spatial information about the door leaf's position, and through coordinate system transformation and algorithmic processing, the system determines the angle of rotation without mechanical contact or external signaling.
2Measurement precision
If a door sensor requires precise alignment procedures, then the measurement precision is improved, but the ease of operation deteriorates
Solution Approach 1:
The door sensor performs automatic self-alignment by using the 3D image sensor to detect the door leaf's position and orientation in space. The system automatically calculates the transformation between its own coordinate system and the door's coordinate system, eliminating the need for manual alignment procedures while maintaining measurement precision.
Solution Approach 2:
The patent incorporates a learning phase during installation where the sensor automatically captures multiple images of the door leaf at different positions and orientations. Through this preliminary action, the system pre-calculates the coordinate system transformation parameters, so that subsequent measurements can be performed without requiring precise manual alignment.
3Ease of operation
If a door sensor uses a common carrier with inclined arrangement, then the ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The common carrier is pre-manufactured with specific inclined angles (15° and 30°) relative to the mounting plane and reference edges. During installation, the carrier is positioned on the door leaf using simple reference edges or markings, and the predetermined inclined angles automatically orient the 3D image sensor and rotation angle sensor correctly without requiring complex alignment procedures.
Solution Approach 2:
The patent specifies precise inclined angles (15° for the rotation angle sensor, 30° for the 3D image sensor) as fixed parameters in the common carrier design. These parameter changes transform the complex alignment problem into a simple positioning task, where the sensors are automatically oriented correctly by the predetermined angular parameters of the carrier structure.
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 allows for the creation of an inexpensive and easy-to-install door sensor that can recognize its installation situation and adjust its monitoring field dynamically with the door's angle, enhancing safety and operational simplicity while maintaining precise alignment and functionality.
Implementation Method 1
3D image sensor for monitoring a monitoring field in front of the door leaf
Implementation Method 2
the rotation angle sensor is preferably a gyro sensor
Data Source
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AI summary
Door sensor (30) for mounting on the door leaf (21) of a swing or revolving door (20) with a 3D image sensor for monitoring a monitoring field (30) in front of the door leaf with a rotary angle encoder for detecting the rotation angle of the door leaf wherein the door sensor has a common carrier which connects the 3D image sensor with the rotary angle encoder.