Spectral Standardization for Foreign Substance Detection
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Solution Overview
Problem
Existing article inspection methods based on spectral characteristics of transmitted and reflected light, such as NIR analysis, struggle to sensitively and stably detect unspecified foreign substances and determine defective products, as the optimality of spectral peaks for abnormality detection is unclear and detection capacity is not guaranteed.
Innovation Solution
An article inspection apparatus that standardizes measured spectral values for each wavelength, calculates statistical values, and sets threshold values to determine whether an article is normal or defective, allowing for sensitive and stable detection of foreign substances and accurate classification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spectral analysis is performed using conventional methods (absorbance calculation, smoothing, differential processing), then processing capability is improved, but detection sensitivity for unspecified foreign substances deteriorates
Solution Approach 1:
The invention changes the parameter of spectral data processing from conventional absorbance calculation and differential processing to standardization processing. By standardizing the spectral data using the formula: standardized value = (measured value - average value) / standard deviation, the system enhances detection sensitivity for unspecified foreign substances while maintaining processing capability. This parameter change transforms the detection approach from peak-magnitude-based to statistical-deviation-based, solving the contradiction between processing capability and detection sensitivity.
2Measurement precision
If calibration curve method is used to specialize in detecting specific objects, then detection accuracy for known objects is improved, but adaptability to unspecified foreign substances deteriorates
Solution Approach 1:
The invention applies universality by making the standardization-based detection method applicable to both known and unspecified foreign substances. Unlike calibration curves that are specialized for specific objects, the standardization method using statistical parameters (mean and standard deviation) can universally detect any spectral deviation, whether from known contaminants or previously unidentified foreign substances. This multi-functional approach resolves the contradiction between detection accuracy for known objects and adaptability to unspecified foreign substances.
3Productivity
If conventional spectral processing is used, then processing speed is improved, but detection stability deteriorates
Solution Approach 1:
The invention substitutes the mechanical processing system (absorbance calculation, smoothing, differential processing) with a statistical processing system (standardization using mean and standard deviation). This substitution maintains processing speed while significantly improving detection stability, as the statistical approach naturally handles spectral variations and provides consistent detection results across different measurement conditions. The standardization method is computationally efficient and produces stable results, resolving the contradiction between processing speed and detection stability.
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 sensitive and stable detection of spectrum changes when foreign substances are present, effectively determining defective products by standardizing spectral values and using threshold settings.
Implementation Method 1
a light irradiation unit that irradiates the article transported to the article inspection position with light, a light detection unit that detects light transmitted through or reflected from the article
Data Source
AI summary
To provide an article inspection apparatus capable of sensitively and stably detecting a change in a spectrum when an unspecified foreign substance is contained and determining a defective product. A transport unit that transports a tablet for inspection to an article inspection position, a light irradiation unit that irradiates the tablet transported to the article inspection position with light, a light detection unit that detects light transmitted through the tablet, and an article inspection unit that inspects a quality of the tablet based on spectral characteristics of the light detected by the light detection unit are provided, and the article inspection unit standardizes a measured value of a spectrum of the light detected by the light detection unit for each wavelength and determines whether the tablet is a normal product or a defective product based on a standardized value.