Adaptive photon correlator on basis of CPLD (Complex Programmable Logic Device) and FPGA (Field Programmable Gate Array)

A photon correlator, self-adaptive technology, used in instruments, scientific instruments, particle and sedimentation analysis, etc., can solve problems such as high price

Active Publication Date: 2012-01-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Most of the above correlator devices are based on specially customized chips, or based on DSP chips, which are expensive

Method used

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  • Adaptive photon correlator on basis of CPLD (Complex Programmable Logic Device) and FPGA (Field Programmable Gate Array)
  • Adaptive photon correlator on basis of CPLD (Complex Programmable Logic Device) and FPGA (Field Programmable Gate Array)
  • Adaptive photon correlator on basis of CPLD (Complex Programmable Logic Device) and FPGA (Field Programmable Gate Array)

Examples

Experimental program
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Embodiment Construction

[0097] Synchronous Reset Module

[0098] iCLK is an external hardware input clock pulse, iRST is an external reset signal input, and oRESET is an output reset signal. Figure 16 It is a simulation waveform. When the power is turned on or the FPGA reset button is pressed, iCLK is counted. When it is less than the set value 16 (this value can be modified), the output is low level, and each module is in the reset stage during this period. , while loading the default initial value data. Then output high level, each module works normally.

[0099] Photon Counting Module

[0100] The simulation waveform of the photon counting module is as follows: Figure 17 . 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...

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Abstract

The invention relates to an adaptive photon correlator on the basis of a CPLD (Complex Programmable Logic Device) and an FPGA (Field Programmable Gate Array), which mainly comprises an FPGA chip circuit, an FPGA clock, reset and reconfiguration circuit, a serial port and USB (Universal Serial Bus) circuit and an encrypting circuit, wherein the FPGA chip circuit is used for realizing a plurality of independent digital correlators; the FPGA clock, reset and reconfiguration circuit is used for realizing driving and synchronous reset of each circuit module in the FPGA and driving of reconfiguration of each circuit module in the FPGA; the serial port and USB circuit is used for realizing communication between the FPGA and a computer and between the CPLD and the computer; and the encrypting circuit is used for encrypting a program configurated on an FPGA chip. For the adaptive photon correlator on the basis of the CPLD and the FPGA, which is disclosed by the invention, a mode that a plurality of configuration chips dynamically selects to configurate one FPGA by the CPLD is adopted, the adaptive dynamical regulation of a configuration scheme of the photon correlator is realized and an obtained correlation function is optimized.

Description

technical field [0001] The invention relates to a device for obtaining a correlation function of a scattered light intensity signal, specifically an adaptive photon correlator based on a complex programmable logic device (CPLD for short, the same below) and a field programmable gate array (FPGA for short, the same below). Background technique [0002] At present, in the photon correlation spectroscopy technology, the devices for obtaining the autocorrelation function and cross-correlation function of the scattered light intensity signal mainly include the TurboCorr of Brookhaven Instruments Corporation, the ALV-6000 and ALV-7000 series digital correlators of the German ALV company, and the United States www.correlator. FLEX02 and other series correlators provided on the 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J11/00G01N15/02
Inventor 韩鹏谌文峰
Owner SOUTH CHINA NORMAL UNIVERSITY
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