Dynamic Gain Adjustment for Fluorescence Detection in HPLC
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Solution Overview
Problem
Existing fluorescence detectors in high-performance liquid chromatographs face challenges in analyzing both high-concentration main components and low-concentration impurities simultaneously, as the gain of the photomultiplier tube needs to be adjusted accordingly to avoid saturation or noise interference.
Innovation Solution
A gain adjustment device that includes an acquirer to monitor the detection value from the photomultiplier tube, a power supply controller to adjust the gain by controlling the power supply, and a corrector to adjust the detection value based on the gain, allowing for dynamic adjustment of the photomultiplier tube's gain during a single analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gain of the photomultiplier tube is reduced to avoid saturation when analyzing high-concentration components, then saturation is prevented, but sensitivity decreases and low-concentration impurities cannot be detected
Solution Approach 1:
The patent implements dynamic gain adjustment of the photomultiplier tube based on real-time detection values. The gain is automatically increased or decreased according to the fluorescence intensity detected, allowing the system to adapt between high-concentration and low-concentration component analysis within a single run, thereby resolving the contradiction between avoiding saturation and maintaining sensitivity
Solution Approach 2:
The patent changes the gain parameter of the photomultiplier tube dynamically during analysis. By adjusting the gain parameter in response to detection values, the system can handle both high and low concentration samples without requiring separate analysis runs, thus solving the contradiction between saturation avoidance and detection precision
2Measurement precision
If the gain of the photomultiplier tube is increased to detect low-concentration components, then detection sensitivity improves, but high-concentration components become saturated
Solution Approach 1:
The system dynamically adjusts the photomultiplier tube gain based on real-time detection values. When low-concentration components are detected, the gain is increased to maintain sensitivity; when high-concentration components are detected, the gain is decreased to prevent saturation. This dynamic adjustment allows both high and low concentration components to be analyzed accurately in a single run
Solution Approach 2:
The patent employs feedback control where the detection value is continuously monitored and used to adjust the photomultiplier tube gain. This closed-loop feedback mechanism ensures that the gain is automatically optimized for the current sample concentration level, preventing both saturation and loss of sensitivity
3Measurement precision
If separate analyses are performed with different gain settings for high-concentration and low-concentration components, then both components can be analyzed, but analysis time increases and efficiency decreases
Solution Approach 1:
The patent enables dynamic gain adjustment during a single analysis run, allowing the system to automatically adapt to different concentration levels without requiring separate analysis protocols. This eliminates the need for multiple sequential analyses and significantly improves productivity while maintaining accuracy
Solution Approach 2:
The patent makes the fluorescence detector universal by enabling it to handle both high-concentration and low-concentration components within a single analysis using automatic gain adjustment. This multi-functionality eliminates the need for separate analysis procedures and improves overall system efficiency
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 the analysis of both high-concentration and low-concentration components in a single analysis, preventing saturation and noise interference, thus improving the efficiency and accuracy of the analysis process.
Implementation Method 1
a light source that excites a sample, a photomultiplier tube that detects fluorescence generated from the sample
Implementation Method 2
a photomultiplier tube that detects fluorescence generated from the sample
Data Source
AI summary
A high performance liquid chromatograph includes a photomultiplier tube that detects fluorescence generated from a sample and a gain adjustment device that adjusts a gain of the photomultiplier tube. The gain adjustment device includes an acquirer that acquires a detection value of fluorescence detected by the photomultiplier tube, a power supply that supplies power to the photomultiplier tube, and a power supply controller that adjusts a gain of the photomultiplier tube in one analysis for a sample by controlling the power supply in accordance with the detection value acquired by the acquirer.