32-Channel PMT Spectrometer for High-Speed DNA Sequencing
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Solution Overview
Problem
Conventional single photon detectors have limited dynamic range and response time, making them inadequate for high-speed DNA sequencing and multi-color fluorescence detection, particularly in biomedical applications where they struggle to process ultra-high speed data and are insensitive to desired levels of BigDye DNA sequencing standards.
Innovation Solution
A 32-channel PMT single photon spectrometer with enhanced dynamic range and frame rate, combined with signal processing algorithms, allows for accurate and high-speed detection of multi-color fluorescence signals, enabling sensitive DNA sequencing and detection of minute amounts of multiple fluorescence dyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single photon PMT detectors are used, then the system can detect single photons, but the dynamic range is limited to 10^6-10^7 photocounts per second
Solution Approach 1:
The patent divides the detection system into multiple parallel detection channels (e.g., 32 channels) that simultaneously detect photons across different wavelength ranges. Each channel operates independently with its own PMT, allowing the system to handle higher total photon flux while maintaining single-photon sensitivity in each channel. This segmentation enables the dynamic range to scale with the number of channels.
Solution Approach 2:
The patent extends detection capability from a single dimension (one wavelength range) to multiple dimensions (multiple wavelength ranges) by using an array of PMTs with different spectral responses. This multi-dimensional approach allows simultaneous detection of photons across the entire visible spectrum, effectively increasing the system's dynamic range without sacrificing single-photon sensitivity.
2Speed
If the response time is reduced to increase frame rate, then the detection speed improves, but the dynamic range decreases
Solution Approach 1:
By segmenting the detection across multiple channels, the patent allows each channel to operate with optimized response characteristics. The parallel architecture enables the system to achieve high frame rates (e.g., 3300 frames per second) while maintaining adequate dynamic range in each channel, as the total detection capacity is distributed across all channels.
Solution Approach 2:
The patent optimizes the response time parameter of the detection system by selecting PMTs and electronic components with fast response characteristics (e.g., response times around 1 ns). This parameter optimization enables the system to achieve high frame rates while maintaining sufficient dynamic range through the multi-channel architecture.
3Productivity
If multi-channel detection is implemented to increase dynamic range, then the detection capability improves, but the device complexity increases
Solution Approach 1:
The patent uses a universal detection platform where multiple PMTs share common control and readout electronics. Each PMT channel can be independently configured for different wavelength ranges, but they all use the same fundamental detection principles and electronic infrastructure, reducing the overall complexity compared to having completely separate detection systems for each channel.
Solution Approach 2:
The patent combines multiple PMT channels into a single integrated detection system with shared control electronics, signal processing, and data acquisition. This merging approach reduces the complexity that would arise from having completely separate systems for each channel, while still maintaining the enhanced dynamic range provided by multiple channels.
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 provides a dynamic range exceeding 20 bits and a frame rate of 3300 frames per second, significantly improving the detection capabilities of multi-channel detectors, enabling accurate DNA sequencing and recognition of combinations of fluorescent moieties with enhanced sensitivity and speed.
Implementation Method 1
A 32 channel PMT single photon detector has a detection dynamic range of more than 20 bits and has a frame rate of about 3300 frames per second
Implementation Method 2
The sensor systems and detection methods include an optical spectra separation unit
Implementation Method 3
accurate and high speed detection, identification and analysis of biological samples labeled with multiple fluorescent markers, such as compositions of multi-color fluorescence signals
Data Source
AI summary
A fiberized single photon sensitive spectrometer based on a 32-channel PMT sensor is highly sensitive with broad detection dynamic range. The spectrometer enables accurate and high speed detection, identification and analysis of biological samples labeled with multiple fluorescent markers, such as compositions of multi-color fluorescence signals or radiation emitted by multiple fluorescence dyes. A fiberized optical input of the spectrometer allows an easy and efficient coupling to any measurement system based on fiber collection of the analyzed fluorescence. The spectrometer provides highly accurate DNA sequencing. A 32 channel PMT single photon detector has a detection dynamic range of more than 20 bits and has a frame rate of about 3300 frames per second. The dynamic range of the detector's pixels reaches 108 photocounts per second.