Bacteria Detection Device Using Surface Filter Concentration
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Solution Overview
Problem
Conventional bacteria detection devices with CMOS oscillator sensors face challenges in accurately detecting bacteria when the depth of the bacterial solution exceeds the sensor's detection region, leading to incomplete detection due to the limited range of the sensor's sensitivity.
Innovation Solution
A bacteria detection device and method that incorporates a filter with openings to selectively permeate the liquid from the bacterial solution, increasing the concentration of bacteria within the sensor's detection region, allowing for accurate detection by storing the permeated liquid in a storage member or absorbing it with a liquid-absorbing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the depth of the bacterial solution exceeds the detection region of the sensor, then the sensor cannot detect bacteria beyond the detection region, but increasing the detection region depth would increase device complexity or cost
Solution Approach 1:
The filter is placed on the liquid surface before detection to preliminarily concentrate bacteria into the detection region. This preliminary action ensures that bacteria are already concentrated in the detectable region before the sensor performs measurement, eliminating the need for deeper detection regions while maintaining high detection accuracy
Solution Approach 2:
The filter acts as an intermediary component between the bacterial solution and the sensor. It mediates the concentration process by selectively retaining bacteria while allowing liquid to pass through, thereby creating a concentrated bacterial sample within the sensor's limited detection region without requiring the sensor itself to be more complex
2Measurement precision
If bacteria concentration in the detection region is low, then detection accuracy decreases, but increasing concentration by extending detection region increases device complexity
Solution Approach 1:
Instead of uniformly increasing the detection region depth throughout the entire reservoir, the filter creates a localized concentration zone at the liquid surface where bacteria are densely packed. This local quality enhancement concentrates bacteria precisely where the sensor can detect them, improving measurement precision without extending the overall detection region depth
3Measurement precision
If the bacterial solution depth exceeds the detection region, then incomplete detection occurs, but reducing liquid volume may affect bacterial culture conditions
Solution Approach 1:
The filter extracts and retains bacteria from the bulk liquid solution, separating them into a concentrated form at the liquid surface. This extraction process allows the sensor to detect bacteria effectively without requiring the entire deep volume of the bacterial solution to be within the detection region, thus maintaining adequate liquid volume for culture while achieving complete detection
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
This approach enables accurate detection of bacteria by concentrating them within the sensor's detection range, enhancing the ability to detect small numbers of bacteria and potentially shortening culture time, while maintaining the integrity of the bacterial solution.
Implementation Method 1
a filter which is placed on a liquid surface of the bacterial solution stored in the reservoir and has an opening for selectively permeating the liquid in the bacterial solution
Data Source
AI summary
The bacteria detection device includes a reservoir which stores a bacterial solution containing bacteria, a sensor which is provided on a bottom of the reservoir and configured to detect the bacteria in the bacterial solution stored in the reservoir, and a filter which is placed on a liquid surface of the bacterial solution stored in the reservoir to permeate the bacterial solution. The filter increases the concentration of the bacteria in the bacterial solution present in a detection region of the sensor by permeating the bacterial solution.