Glossiness Inspection Device Offset Compensation
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Solution Overview
Problem
Conventional glossiness inspection devices face challenges in achieving high accuracy due to insufficient calibration accuracy and sensitivity changes, leading to false detection of glossiness in images.
Innovation Solution
A glossiness inspection device comprising an illumination device, a light receiving device, a correction plate with distinct gloss regions, a dimmer, a detection signal adjuster, and a hardware processor that adjusts irradiation light, gain, and signal offset to compensate for changes in sensitivity, ensuring accurate glossiness measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gain of the amplifier is changed to improve sensitivity for detecting minute gloss differences, then the sensitivity for inspecting glossiness is improved, but false detection of gloss occurs due to offset generated by gain change
Solution Approach 1:
The patent changes the parameter being measured from absolute glossiness value to glossiness difference value. When gain changes occur, the system measures the difference between glossiness before and after gain adjustment, which eliminates the offset error. This parameter transformation allows the system to maintain high sensitivity while avoiding false detections caused by gain-induced offsets.
Solution Approach 2:
The system implements feedback by continuously monitoring the detection signal and comparing it with reference values. The control unit adjusts the amplifier gain based on feedback from the detection results, and measures glossiness changes relative to the feedback signal. This closed-loop feedback mechanism compensates for offset errors and maintains accurate glossiness measurement despite gain variations.
2Ease of manufacture
If calibration is performed using a reference correction plate with high glossiness, then the calibration process is simplified, but the calibration accuracy is insufficient
Solution Approach 1:
The reference correction plate is segmented into multiple regions with different known glossiness values (first gloss region with first glossiness, second gloss region with second glossiness). This segmentation allows calibration across multiple reference points rather than relying on a single high-gloss reference, thereby improving calibration accuracy while maintaining process simplicity.
Solution Approach 2:
Different regions of the reference correction plate have different local qualities (different glossiness values). By using these locally varied reference regions, the system can perform more accurate calibration for different glossiness ranges, improving overall calibration accuracy compared to using a uniform high-gloss reference plate.
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 solution enables accurate glossiness inspection by compensating for offset errors caused by gain changes, thereby improving the precision of glossiness detection even when sensitivity is altered.
Implementation Method 1
a light receiving device that receives reflected light of the irradiation light reflected by a glossiness detection target and outputs a light reception detection signal according to an amount of the received light
Data Source
AI summary
A glossiness inspection device includes an illumination device that emits irradiation light to a glossiness detection target and a light receiving device that receives reflected light of the irradiation light reflected by the glossiness detection target and outputs a light reception detection signal according to an amount of the received light. A dimmer of the device adjusts an amount of the irradiation light, and a detection signal adjuster of the device adjusts a gain for amplifying the light reception detection signal. An irradiation position controller of the device selectively irradiates a first gloss region and a second gloss region of a correction plate with the irradiation light. A hardware processor of the device adjusts at least one of the amount of the irradiation light, an offset of the detection signal adjuster, a characteristic straight line for calculating a glossiness, or a calculated glossiness.