Optical Measuring Apparatus Polarizing Plate Skip Light
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Solution Overview
Problem
Conventional optical measuring apparatuses fail to accurately measure dimensions due to the adverse influence of skip light reflecting off nearly mirror-like surfaces, leading to incorrect measurements as the time the laser beam is blocked is shorter, resulting in dimensions being measured smaller than actual.
Innovation Solution
Incorporating a polarizing plate that allows only laser beams directed orthogonally to the emission and axis of the measured object to pass through, reducing the amount of incident skip light received by the photoreceiver, thereby enabling accurate dimension measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional optical measuring apparatus measures dimension based on laser beam blocking time, then the measurement process is simple, but skip light reflecting off mirror-like surfaces causes measurement error and reduces measurement precision
Solution Approach 1:
A polarizing plate is introduced as an intermediary component between the laser beam source and the measured object. The polarizing plate selectively transmits laser beams with specific polarization directions while blocking skip light with different polarization characteristics, thereby eliminating measurement errors caused by skip light without fundamentally changing the measurement principle
Solution Approach 2:
The invention changes the polarization parameter of the laser beam by using a polarizing plate. This parameter change allows the system to distinguish between the intended laser beam and unwanted skip light based on their different polarization states, thereby improving measurement precision while maintaining relatively simple device structure
2Measurement precision
If the polarizing plate is placed between the scanner and the measured object, then skip light is effectively blocked, but the device structure becomes more complex
Solution Approach 1:
The polarizing plate serves as a mediator that filters light based on polarization characteristics. By positioning it between the scanner and measured object, it selectively transmits the polarized laser beam while blocking skip light, improving measurement accuracy without requiring fundamental redesign of the apparatus
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
The polarizing plate effectively attenuates skip light, ensuring accurate measurement of the object's dimensions by reducing the impact of reflected light, thus providing precise measurements.
Implementation Method 1
The polarizing plate allows passage for only a laser beam, among the laser beams fired by the scanner, directed orthogonally to an emission direction of the laser beam and an axis direction of the measured object
Implementation Method 2
The photoreceiver receives the laser beam that has passed through the measurement region and the polarizing plate
Data Source
AI summary
An optical measuring apparatus includes a light emitter, a scanner, a polarizing plate, a photoreceiver, and a CPU. The light emitter emits a laser beam. The scanner uses the laser beam emitted from the light emitter and scans a measurement region where a work piece is placed. The polarizing plate allows passage for only a laser beam, among the laser beams fired by the scanner, directed orthogonally to an emission direction of the laser beam and an axis direction of the work piece. The photoreceiver receives the laser beam that has passed through the measurement region and the polarizing plate. The CPU calculates a dimension of the work piece from a pattern of light and dark in a scan direction, the pattern being obtained by the photoreceiver.