Nanosecond Spectrometer Calibration via LED-PMT Signal Loop
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Solution Overview
Problem
Current spectrometers lack specialized equipment for calibrating and testing their parameters and performance, which is crucial for accurate multi-parameter extraction in fields like environmental monitoring, nuclear physics, and national defense security.
Innovation Solution
A multi-parameter test and calibration system for spectrometers based on a nanosecond light source, utilizing a ZYNQ SoC processor, DDR3 memory, EMMC, power supply unit, main channel for nuclear pulse signals, and coincidence channel, connected through a network, with specific components like DAC, LED, PMT, and preamplifiers to generate and process nuclear pulse signals for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a spectrometer is designed for multi-parameter extraction, then the functionality and application range are improved, but there is no specialized equipment to calibrate and test the parameters and performance
Solution Approach 1:
The patent designs a calibration system that can test multiple parameters including coincidence performance, anti-coincidence performance, spectral line broadening, resolution, and stability using a single integrated apparatus. The system uses a programmable pulse generator that can output various signal types and a spectrometer that can measure different parameters, making the calibration equipment universal and adaptable to multiple testing requirements.
Solution Approach 2:
The patent creates a simulated nuclear pulse signal system that generates artificial signals mimicking real nuclear decay patterns. The programmable pulse generator creates digital signals that are converted to analog signals through DAC, and the system can simulate different coincidence and anti-coincidence scenarios without requiring actual radioactive sources, thus simplifying the calibration process.
2Measurement precision
If specialized calibration equipment is designed, then the measurement precision and reliability of spectrometer parameters are improved, but the device complexity increases
Solution Approach 1:
The calibration system is divided into independent functional modules: a programmable pulse generator for signal generation, a DAC for digital-to-analog conversion, a spectrometer for measurement, and a computer for control and data processing. Each module can be independently configured and tested, making the overall system easier to manage despite its complexity. The modular design allows for flexible configuration of different calibration scenarios.
Solution Approach 2:
The system incorporates feedback mechanisms where the spectrometer measures parameters and the computer analyzes the results to provide feedback for calibration adjustments. The programmable pulse generator can adjust signal parameters based on measurement results, creating a closed-loop calibration process that improves precision while maintaining system manageability through automated control.
3Reliability
If comprehensive parameter testing is implemented, then the reliability of spectrometer performance is improved, but the testing time and complexity increase
Solution Approach 1:
The patent implements preliminary calibration actions by pre-configuring the programmable pulse generator with various signal patterns and parameters before actual testing. The system can pre-set coincidence and anti-coincidence scenarios, spectral line parameters, and other test conditions, allowing rapid switching between different calibration modes without time-consuming setup procedures during the testing process.
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 comprehensive calibration of spectrometer parameters such as coincidence and anti-coincidence performance, spectral line broadening, resolution, and stability, reducing the complexity of spectrometer development and testing.
Implementation Method 1
an LED, an optical filter, a photomultiplier tube (PMT), a preamplifier
Implementation Method 2
a photomultiplier tube (PMT), a preamplifier
Data Source
AI summary
The present disclosure provides a multi-parameter calibration system for a spectrometer based on a nanosecond light source, including a main channel for outputting nuclear pulse signals, and a coincidence channel for outputting the nuclear pulse signals. Each channel uses current nuclear pulse signals to drive a light-emitting diode (LED) to emit nuclear pulse optical signals, and a simulated scintillator is irradiated to emit nanosecond nuclear pulse optical signals. The present disclosure can respectively test and calibrate multiple parameter performance indexes of the spectrometer throughput baseline restoration spectrometer. The stability of the spectrometer is tested and calibrated through output of certain regular nuclear pulse signals.