Random pulse multichannel amplitude analyzer under high counting rate

A random pulse, high count rate technology, applied in X-ray energy spectrum distribution measurement and other directions, can solve the problems of pulse baseline estimation and amplitude detection error, pulse start and stop signal jitter, small amplitude pulse loss, etc., to eliminate amplitude judgment error, Improved accuracy and improved precision

Active Publication Date: 2017-11-14
DANDONG DONGFANG MEASUREMENT&CONTROL TECHCO
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can achieve a high counting pass rate, because the baseline of the detector pulse signal changes with the count rate, the threshold value changes relative to the baseline, and small-amplitude pulse loss and pulse start-stop sig

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Random pulse multichannel amplitude analyzer under high counting rate
  • Random pulse multichannel amplitude analyzer under high counting rate
  • Random pulse multichannel amplitude analyzer under high counting rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The specific embodiment of the present invention will be described in detail in conjunction with the accompanying drawings.

[0025] The operating principle of the multi-channel pulse amplitude analyzer of the present invention is as follows: figure 1 As shown, the gain adjustment circuit (1) amplifies the pulse signal output by the detector to the range of 0V~1V, the high-speed ADC (2) is an AD9236 digital-to-analog converter with a sampling frequency of 80MHz, and the sampling period is 12.5ns, and the filter (3) It is an FIR digital low-pass filter, which smoothes the detector signal sampled by the ADC. The differentiator (4) is an approximate ideal signal differentiator realized by FIR. After passing through the differentiator, the pulse signal becomes narrower, and the pulse amplitude judgment (5) Continuously judge the baseline value and pulse maximum value of the detector pulse signal, subtract the baseline value from the maximum value to obtain the pulse amplitu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a random pulse multichannel amplitude analyzer under a high counting rate, and an FPGA single chip is used to complete main functions. In an FPGA, a digital detector pulse signal is differentiated, and a differential signal is used to generate a pulse start and stop signal which controls the pulse amplitude detection. When the pulse start and stop signal is invalid, the estimation of a baseline value of a detector pulse signal is started, the maximum value of the detector pulse signal is detected when the pulse start and stop signal is valid, and a corresponding amplitude value of a detector pulse is obtained by subtracting the currently estimated baseline value from the maximum value. A number of pulses of a corresponding differential signal is judged in a certain time after the detector pulse signal is valid, if the pulse number is larger than or equal to 2, detector pulse signal stacking is judged, and the pulses are not included in an energy spectrum.

Description

technical field [0001] The invention relates to a random pulse multi-channel amplitude analyzer at a high count rate, in particular to a digital multi-channel pulse amplitude analyzer for collecting the energy spectrum of an ɣ-ray detector signal. Background technique [0002] The multi-channel pulse amplitude analyzer plays an important role in the detection of radiation events, and can obtain ray energy spectrum data. In different applications, the range of the analyzer can be set to 1024 channels, 2048 channels, 4096 channels, etc., and each channel can be simultaneously Measurement. The output signal of the radiation detector is random, and the pulse signal is superimposed on the changing baseline. When multiple radiation events occur within the resolution time of the detector, the output signal of the detector will pile up. At high count rates, the pulsed The accumulation is more serious. With the development of radiation detection technology and the continuous improv...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01T1/36
CPCG01T1/36
Inventor 于海明张伟陈月红
Owner DANDONG DONGFANG MEASUREMENT&CONTROL TECHCO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap