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Proportional photon correlator based on digital signal processor (DSP) annular buffer area

A ring buffer and photon correlator technology, which is applied in scientific instruments, measuring devices, particle size analysis, etc., can solve the problem of not being able to determine the delay time of the proportional correlator channel in advance, the design problem of the delay unit of the photon count value, and hinder the proportional photon correlator Implementation and other issues, to achieve the effect of flexible delay time, low hardware cost, and large dynamic range

Inactive Publication Date: 2012-11-28
SHANDONG UNIV OF TECH
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Problems solved by technology

[0006] However, since the channel delay time of the proportional correlator cannot be determined in advance, the design of the photon count delay unit becomes a difficult problem, which hinders the realization of the proportional photon correlator.

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  • Proportional photon correlator based on digital signal processor (DSP) annular buffer area
  • Proportional photon correlator based on digital signal processor (DSP) annular buffer area
  • Proportional photon correlator based on digital signal processor (DSP) annular buffer area

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Embodiment Construction

[0044] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific diagrams.

[0045] refer to figure 2 , image 3 The proportional photon correlator based on the DSP ring buffer comprises an FPGA chip circuit, a DSP chip circuit, and a computer PC, and the DSP chip circuit is respectively connected to the FPGA chip circuit and the computer PC. The FPGA chip circuit includes a sampling time setting module SampleTime, a reset module Reset, and a photon counting module Counter. The DSP chip circuit includes a correlation channel delay time calculation module, a ring buffer, and a correlation calculation module. The FPGA chip circuit generates a sampling clock signal and counts photon pulses. The DSP chip circuit realizes the function of the shift register through the ring buffer, sets the delay time of each channel according ...

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Abstract

The invention relates to the technical field of photon correlation spectroscopy granulometry, in particular to a photon correlator. A proportional photon correlator based on a digital signal processor (DSP) annular buffer area comprises a field programmable gate array (FPGA) chip circuit, a DSP chip circuit and a computer, wherein the DSP chip circuit is respectively connected with the FPGA chip circuit and the computer; the FPGA chip circuit comprises a sampling time setting module, a reset module and a photon counting module; and the DSP chip circuit comprises a correlation channel delay time computation module, an annular buffer area and a correlation operation module. By adoption of the technical scheme, a DSP and an FPGA chip are combined together, the size of the correlator is reduced, and the cost of the correlator is reduced.

Description

technical field [0001] The invention relates to the technical field of photon correlation spectroscopy particle size measurement, in particular to a photon correlator. Background technique [0002] In the suspension of sub-micron and nano-particles, the particles are in constant motion due to the continuous impact of the surrounding liquid molecules undergoing Brownian motion. The smaller the particle, the more violent the motion. This movement causes the frequency of the scattered light of the particles to produce a Doppler frequency shift relative to the incident light, which is manifested in that at a certain scattering angle, the intensity of the scattered light fluctuates with time, which is the result of the scattered light field emitted by each particle. The dynamic fluctuation of scattered light caused by coherent superposition is called dynamic light scattering. The photon correlation spectroscopy particle measurement method obtains the particle size and distributio...

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Application Information

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IPC IPC(8): G01N15/02
Inventor 刘伟陆文玲申晋王雅静谭博学孙贤明
Owner SHANDONG UNIV OF TECH
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