Laser Speckle Microbe Detection Apparatus
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Solution Overview
Problem
Current methods for detecting microbes or bacteria in food are time-consuming, require expensive and complex equipment, and are not easily accessible for use in food factories or homes, making it difficult to assess food freshness during distribution and storage.
Innovation Solution
A portable optical system using a light source and camera to measure laser speckles formed by multiple light scattering, allowing for quick and precise detection of microbes or bacteria based on temporal correlation and standard deviation of light intensity, without the need for specialized knowledge or facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods such as microorganism culture, mass spectrometry, or nuclear magnetic resonance are used to detect microbes, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical and chemical detection systems (microorganism culture, mass spectrometry, nuclear magnetic resonance) with an optical detection system using laser speckle patterns. The laser light source and camera-based imaging system substitute for expensive and complex laboratory equipment, achieving microbe detection through optical scattering patterns rather than mechanical or chemical processes.
Solution Approach 2:
The patent creates an optical copy or representation of microbe presence through laser speckle patterns. Instead of directly analyzing microbial properties with complex instruments, the system captures speckle pattern images that represent microbial activity, then uses image processing and correlation analysis to detect and quantify microbes based on these optical copies.
2Measurement precision
If conventional optical methods such as Raman spectrometry or multispectral imaging are used, then measurement precision is improved, but ease of operation deteriorates due to requiring specialized knowledge and complicated optical systems
Solution Approach 1:
The patent employs inexpensive, commercially available components (laser pointer, digital camera) instead of expensive, specialized optical equipment. These simple, readily accessible objects replace complex spectrometers and multispectral imaging systems, making the detection method affordable and easy to operate without requiring specialized laboratory facilities or expert knowledge.
Solution Approach 2:
The system uses the camera's built-in image processing capabilities and automatic analysis algorithms to perform detection. The speckle pattern images are automatically captured and analyzed through correlation processing, eliminating the need for operators to manually interpret complex spectral data or perform sophisticated optical adjustments, thereby simplifying operation.
3Measurement precision
If conventional methods are used for microbe detection, then measurement precision is improved, but loss of time increases due to long sample preparation and measurement durations
Solution Approach 1:
The patent captures laser speckle patterns that inherently encode microbial presence and activity information in real-time. The speckle patterns are formed immediately upon laser illumination, capturing the current state of microbial scattering without requiring preliminary sample preparation steps such as culturing, extraction, or complex processing that would consume time before measurement can begin.
Solution Approach 2:
The system rapidly captures speckle pattern images and performs quick correlation analysis to detect microbes. Instead of following lengthy conventional protocols involving incubation periods, chemical processing, or sequential analysis steps, the method rushes through detection by capturing optical patterns and processing them computationally, dramatically reducing the time from sample placement to detection result.
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 rapid and accurate detection of microbial activity in food, facilitating timely identification of spoilage and ensuring food safety without the need for complex setups, suitable for use in various environments including storage and distribution lines.
Implementation Method 1
laser speckles, which are formed due to a multiple scattering of the light which is incident into the sample
Implementation Method 2
measuring laser speckles, which are formed due to a multiple scattering of the light
Data Source
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AI summary
An apparatus and method for detecting microbes use laser speckles. The apparatus includes a light source configured to irradiate light into a sample to detect microbes, and a measuring part configured to measure laser speckles, which are formed due to a multiple scattering of the light which is incident into the sample, every reference time and to measure concentration of the microbes contained in the sample based on temporal correlation of the measured laser speckles.