Non-contact Displacement Detection Apparatus for Tilt and Position Measurement
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Solution Overview
Problem
Non-contact displacement detection systems struggle to accurately distinguish between displacement and tilt angles of a target object, as the waveforms generated by these conditions overlap, leading to inconclusive measurement outcomes.
Innovation Solution
A measurement method and apparatus that calculate pixel deviations between sensors to derive tilt angles and positions using multiple linear functions, where a beam splitter splits reflected light into two paths for separate measurement by sensors, and a processing circuit executes steps to select appropriate curves and calculate the object's position and tilt angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used to detect reflected light, then the device structure is simple, but the measurement precision deteriorates because the sensor cannot distinguish between tilt angle and displacement
Solution Approach 1:
The patent divides the detection function into two separate sensors: one sensor detects the position of the light spot to determine displacement, while the other sensor detects the shape/width of the light spot to determine tilt angle. This segmentation allows each sensor to specialize in one measurement parameter, resolving the ambiguity that occurs when a single sensor tries to detect both parameters simultaneously.
2Loss of information
If the laser beam hits the target object with tilt angle, then the light spot shape changes providing tilt information, but the waveform overlaps with displacement waveform making it difficult to distinguish the two parameters
Solution Approach 1:
The patent extracts different measurement information from different characteristics of the reflected light: the position of the light spot center is extracted to determine displacement, while the width/shape of the light spot is extracted to determine tilt angle. By separating the extraction of these two parameters, the patent avoids the waveform overlap problem and enables independent measurement of each parameter.
3Measurement precision
If multiple sensors are used to measure different parameters, then the measurement precision improves, but the device complexity increases due to additional components
Solution Approach 1:
The patent employs a beam splitter that can simultaneously direct light to multiple sensors, allowing a single optical component to serve multiple detection functions. The beam splitter divides the reflected light into different paths, enabling each sensor to receive appropriate light information for its specific measurement task while sharing common optical infrastructure, thus reducing overall system complexity.
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
Enables accurate determination of both position and tilt angle of a target object by obtaining multiple linear functions during calibration, improving the system's ability to differentiate between displacement and tilt, thereby enhancing measurement precision.
Implementation Method 1
a beam splitter, a first sensor, a second sensor and a processing circuit. The light source is configured to provide a laser light to a surface of a target object. The beam splitter is configured to split a reflected light reflected from the surface into a first split light and a second split light.
Implementation Method 2
The first sensor is configured to receive the first split light to measure at least one first pixel. The second sensor is configured to receive the second split light to measure at least one second pixel.
Data Source
AI summary
A measurement method for measuring a position and a tilt angle of a target object includes the following steps. A pixel deviation between a first pixel and a second pixel of the target object is calculated. The pixel deviation is substituted into a curve of curve of tilt angle versus pixel deviation to obtain the tilt angle of the target object. A first target curve and a second target curve are selected according to the first pixel, the second pixel and the tilt angle. A zero-tilt angle is substituted into the first target curve and the second target curve, respectively, to obtain a pixel at the zero-tilt angle. The pixel at the zero-tilt angle is substituted into a position curve to obtain the position of the target object.