Optical Pickup Pulse Signal Segmentation for Particle Counting
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Solution Overview
Problem
Conventional analysis devices face challenges in accurately counting particles that are close to each other on an optical disc, leading to interference in pulse signals and reduced quantitative performance, especially when dealing with samples containing a large amount of detection target substances.
Innovation Solution
An analysis device and method that utilize an optical pickup to irradiate a sample analysis disc and receive reflection light, generating a light reception level signal, and a controller to count pulses with specific extreme value points and conditions, allowing for accurate counting of particles even when they are close to each other by distinguishing between different waveform directions and amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If particles are bound to detection target substances adhering to the optical disc, then the detection target substances can be counted indirectly by counting particles, but the particles may aggregate adjacent to each other causing pulse signal interference
Solution Approach 1:
The patent segments the pulse signal analysis by identifying multiple extreme value points (first, second, and third extreme value points) within a single pulse waveform. This segmentation allows the system to distinguish between aggregated particles and individual particles by analyzing the internal structure of the pulse signal, thereby maintaining counting accuracy even when particles are aggregated.
Solution Approach 2:
The patent introduces a new dimension of analysis by examining the temporal structure of pulse signals through multiple extreme value points rather than relying solely on pulse amplitude or width. This dimensional approach to signal analysis enables differentiation of particle aggregation states without requiring physical separation of particles.
2Quantity of substance
If a sample containing a large amount of detection target substances is used, then more particles are fixed to the optical disc, but the number of aggregated particles increases causing more pulse signal interference
Solution Approach 1:
By segmenting the pulse waveform analysis into multiple extreme value points, the system can accurately count individual particles even in high-concentration samples where aggregation is more likely. The segmentation approach maintains measurement precision across a wide range of particle concentrations.
Solution Approach 2:
The patent applies partial action by focusing analysis on specific characteristic points (extreme value points) within the pulse signal rather than attempting to analyze the entire continuous waveform. This selective approach maintains accuracy while reducing computational complexity in high-concentration samples.
3Device complexity
If conventional pulse signal counting is used, then the counting process is simple, but the correspondence between detection target substances and particles is insufficient due to pulse signal interference
Solution Approach 1:
The patent segments pulse signal analysis into identification of multiple extreme value points, creating a systematic approach that improves quantitative correspondence while maintaining reasonable process complexity. The segmented approach provides clear criteria for particle identification and counting.
Solution Approach 2:
The patent implements periodic action through a structured sequence of signal processing steps: detecting extreme value points, determining their temporal relationships, and applying counting rules. This periodic systematic approach ensures consistent and reproducible particle counting with improved quantitative correspondence.
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 high quantitative performance by accurately differentiating and counting particles, even when they are adjacent, thereby improving the correspondence between detection target substances and particles, enhancing the analysis device's ability to handle samples with a high concentration of detection targets.
Implementation Method 1
an optical pickup configured to irradiate a sample analysis disc with an irradiation light, and receive a reflection light of the irradiation light from the sample analysis disc to generate a light reception level signal
Data Source
AI summary
An analysis device includes a controller configured to count a pulse derived from a particles as a plural particles when a light reception level signal includes the pulse having a first extreme value point, a second extreme value point, and a third extreme value point, and the pulse fulfils a condition in which the third extreme value point is present between the first extreme value point and the second extreme value point in a pulse width direction of the pulse, the third extreme value point is present between the first extreme value point and a threshold in a pulse amplitude direction, the first extreme value point and the second extreme value point are each an extreme value point of a waveform projecting in a common direction, and the third extreme value point is an extreme value point of a waveform in a direction opposite to the common direction.