Photon correlator based on field programmable gate array (FPGA)

A photon correlator and correlator technology, applied in scientific instruments, measuring devices, particle size analysis, etc., can solve problems such as high price

Inactive Publication Date: 2010-06-09
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the above correlator devices are based on specia

Method used

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  • Photon correlator based on field programmable gate array (FPGA)
  • Photon correlator based on field programmable gate array (FPGA)
  • Photon correlator based on field programmable gate array (FPGA)

Examples

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Embodiment Construction

[0056] Synchronous Reset Module

[0057] iCLK is an external hardware input clock pulse, and oReset is an output reset signal. Figure 11 It is a simulation waveform. When it is powered on, it counts iCLK. When it is less than the set value 16 (this value can be modified), the output is low level. During this period, each module is in the reset stage, and the default initial value is loaded at the same time. data. Then output high level, each module works normally.

[0058] Photon Counting Module

[0059] The simulation waveform of the photon counting module is as follows: Figure 12 . When iRST is high level, the counting module works normally, iCLK50M is the clock input of 50M, iPhotonPulse is the photon pulse signal, iSampleWord is the sampling time parameter setting, taking 5us sampling time and 50M clock input as an example, iSampleWord=(5x10 -6 / (1 / 50x10 6 ))=250. oDataCLK is the output clock of the data, and the data is latched and output on the rising edge. Whe...

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Abstract

The invention relates to a photon correlator based on a field programmable gate array (FPGA), which is used for obtaining scattered light signal autocorrelation function in photon-correlation spectroscopy granulometry technology and is mainly composed of a synchronous reset module, a photon counting module, a correlation algorithm module and a computer interface module, wherein the photon counting module carries out the evenly spaced counting for photon signal period of a photon detector and sends the result to the photon correlation algorithm module to obtain a correlation function; the computer interface module sends the result to the computer. The invention realizes the high-speed photon correlator based on the field programmable gate array (FPGA) and expands the number of channels of the correlator and dynamic range time in a multi-disc FPGA cascading mode.

Description

technical field [0001] The invention relates to a device for obtaining an autocorrelation function of a scattered light signal in photon correlation spectroscopy particle size measurement technology, in particular to a photon correlator based on a field programmable gate array (FPGA). Background technique [0002] At present, in the photon correlation spectroscopy particle size measurement technology, the devices for obtaining the autocorrelation function of the scattered light intensity signal mainly include Brookhaven Instruments Corporation's BI-9010AT, BI-9000AT and the latest TurboCorr, German ALV company ALV-6000, ALV-7000 series Digital correlators and series correlators such as FLEX02 available on the US www.correlator.com website. [0003] Most of the above-mentioned correlator devices are based on specially customized chips or DSP chips, which are expensive. Contents of the invention [0004] The purpose of the present invention is to provide a photon correlator...

Claims

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Application Information

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IPC IPC(8): G01N15/02
Inventor 韩鹏吴国光杨冠玲邱健
Owner SOUTH CHINA NORMAL UNIVERSITY
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