Infrared Transmission Cell With Real-Time Y-Junction Flow Sensing
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Solution Overview
Problem
Existing microfluidic modulation spectroscopy techniques face challenges in efficiently measuring biological samples in aqueous solutions due to difficulties in producing significant amounts of proteins and nucleic acid structures, and issues with fluid management leading to inefficiencies and contamination during data collection.
Innovation Solution
Incorporation of a flow sensor at the output of the Y junction in the MMS system to measure flow rates and adjust parameters in real-time, enabling precise control of fluid flow, minimizing fluid usage, and detecting fluid exhaustion to maintain measurement stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microfluidic modulation spectroscopy is used to measure biological samples in aqueous solutions, then measurement sensitivity and repeatability are improved, but fluid management issues lead to contamination and inefficiency during data collection
Solution Approach 1:
A flow sensor is integrated into the MMS system to provide real-time feedback on fluid flow rates. The sensor measures flow rate and direction, allowing the system to detect fluid exhaustion and adjust parameters dynamically during data collection, preventing contamination and maintaining measurement reliability
Solution Approach 2:
The system automatically monitors its own fluid flow conditions through the integrated flow sensor, enabling self-detection of fluid exhaustion and self-adjustment of measurement parameters without external intervention, maintaining both sensitivity and reliability
2Measurement precision
If significant amounts of proteins and nucleic acid structures are produced for measurement, then measurement accuracy is improved, but production difficulty increases
Solution Approach 1:
The system replaces the need for large sample volumes with an optical measurement technique (infrared spectroscopy) that requires minimal sample amounts. The MMS method enables accurate measurements with small sample volumes by using modulation spectroscopy to enhance signal detection
Solution Approach 2:
The system changes the measurement parameters by using infrared transmission spectroscopy with specific wavelength tuning to achieve high sensitivity measurements with minimal sample material, avoiding the need to produce large amounts of biological samples
3Loss of substance
If real-time flow rate adjustment is implemented, then fluid consumption is reduced, but system complexity increases
Solution Approach 1:
The flow sensor provides real-time feedback on fluid flow rates, enabling the system to automatically adjust flow parameters to minimize fluid consumption while maintaining measurement quality, with the controller managing the complex coordination between flow control and spectroscopy measurements
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
Enhances measurement sensitivity and repeatability by optimizing system performance, reducing fluid consumption, and preventing contamination, allowing for accurate analysis of small sample volumes with high throughput.
Implementation Method 1
infra-red transmission spectroscopy to measure biological samples in aqueous solutions
Implementation Method 2
transmit the coherent light through the chamber window to produce a chamber signal
Implementation Method 3
a flow sensor configured to measure a flow rate and a flow direction of the liquid analyte and the prescribed reference solution through the output of the liquid flow cell
Data Source
AI summary
A flow meter is positioned in an Microfluidic Modulation Spectroscopy system at the output of the Y junction of a flow cell. The MMS system instantaneously measures the flow rate through the flow cell and adjusts parameters such as fluid backing pressure, valve open time, and dwell time before data collection. This allows an opportunity to optimize the system performance and minimize the fluid usage in real time. The flow sensor is capable of measuring fluid flow in the range of 0-100 microliter per second. The incorporation of the flow meter at the output of the Y junction immediately following measurement of the sample and reference fluids allows for real-time adjustments of operating parameters. The capability of the system to adjust operating parameters and make corrections in real time based on the measurements by the flow meter allows the instrument to automatically measure arrays of samples on a well plate.