High-speed photon correlator with large dynamic range

A technology of photon correlator and large dynamic range, which is applied in the direction of instruments, scientific instruments, measuring devices, etc. It can solve the problems of high cost of correlators and unstable baseline of correlation functions, etc., so as to improve dynamic range, increase speed, and reduce hardware resources the effect of the demand
CN102798589AInactive Publication Date: 2012-11-28SHANDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG UNIV OF TECH
Publication Date
2012-11-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of granularity measurement of a photon correlation spectroscopy and particularly relates to a photon correlator. The high-speed photon correlator with a large dynamic range comprises a photon correlator; the photon correlator comprises channels and the channels comprise a high-speed channel and a low-speed channel; the high-speed photon correlator further comprises an FPGA (Field Programmable Gate Array) chip circuit, a DSP (Digital Signal Processor) chip circuit and a computer; and the DSP chip circuit is respectively connected with the FPGA chip circuit and the computer. The FPGA chip circuit is used for computing the high-speed channel and the DSP chip circuit is used for computing the low-speed channel. According to the high-speed photon correlator with the large dynamic range disclosed by the invention, based on the structure combining the high-speed channel and the low-speed channel, fewer hardware resources are utilized, so that a dynamic range of the correlator is improved and the high-speed correlation computation is realized; and meanwhile, the cost of the correlator is reduced.
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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] Photon correlation spectroscopy is an effective method to study the dynamic characteristics of the sample. The sample particles cause fluctuations in the intensity and frequency of the scattered light due to Brownian motion. By measuring the autocorrelation function of the light intensity of the scattered light, the dynamic information of the particle system can be obtained. The photon correlator is the core device of the photon correlation spectroscopy nanoparticle particle size measurement system. The device is used to count the photon pulses of scattered light, and perform real-time autocorrelation calculations to obtain autocorrelation functions to obtain the time correlation of scattered light. information. Photon correlation calculations can be realized by software or hardw...

Claims

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