A Digital Photon Correlator and Photon Measurement System Based on Programmable Gate Array

Abstract

The invention discloses a digital photon correlator and a photon measurement system of a programmable gate array. The digital photon correlator comprises: a system synchronous operation module, a photon calculation module, a correlation operation module and a communication control module arranged in an internal circuit of an FPGA chip module; wherein, the system synchronous operation module is respectively connected with the photon calculation module, the correlation calculation module and the communication control module; the photon calculation module, the correlation calculation module and the communication control module are connected in sequence , the photon computing module is connected with an external photomultiplier tube, and the communication control module is connected with an external terminal. The invention can make full use of the logic resources of the FPGA chip and the memory resources in the FPGA chip, and give full play to the respective performance and advantages of the logic resources and memory resources in the FPGA, so as to improve the operation speed of the FPGA hardware photonic correlator and the maximum channel of operation. number.

Description

technical field [0001] The invention relates to the technical field of particle size measurement by photon correlation spectroscopy, in particular to a digital photon correlator and a photon measurement system of a programmable gate array. Background technique [0002] In the process of particle size measurement, the information contained in the particle is obtained by measuring the similarity between the changes of the scattered light intensity signal at different times. The device is a photonic correlator or a digital correlator. [0003] In the measurement of photon correlation spectroscopy, the hardware photon correlator is the main measurement device, and most photon correlators are realized by FPGA. At present, there are two ways to realize the hardware photonic correlator based on FPGA: one is realized by logic unit only based on FPGA, and the other is realized by two resources of memory and logic unit based on FPGA. The correlator based on the FPGA logic unit is ca...

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Problems solved by technology

[0004] Using a memory structure correlator, although the maximum number of integrated channels is large, the channel calculation delay time is long and the measurement efficiency is low; while the traditional correlator has a short calculation delay time, but the number of channels is small, and the measured photon capacity is small. If you increase the number of channels to improve, it will also increase the delay time, thereby reducing the measurement efficiency

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