FPGA (field programmable gate array)-based multiplexing photon correlator

Abstract

The utility model relates to an FPGA (field programmable gate array)-based multiplexing photon correlator, in particular to an FPGA-based multiplexing photon correlator which inputs multiple ways of photon signals from a single port or multiple ports and can calculate autocorrelation functions of all the signals within measurement time. The correlator mainly comprises a system synchronous operation module, a multi-way photon counting module, a multi-way correlation operation module, a communication interface module and the like. The correlator is characterized in that through time division multiplexing, the multiple ways of photon signals are input from the single port or the multiple ports in a serial manner, the autocorrelation functions of all the signals are calculated respectively within measurement time, and correlated operation results are output. The correlator cooperates with proper light paths and can extend a photon-correlated spectral measurement technology from traditional single-point measurement to three-dimensional space measurement, so that the correlator can be applied to fields of two-dimensional and three-dimensional dynamic light scattering imaging, multi-point dynamic light scattering signal monitoring and the like, and the application range of the photon-correlated spectral technology is greatly expanded.

Description

technical field [0001] The invention relates to the technical field of photon correlation spectrum measurement, in particular to a multiplexing photon correlator based on a field programmable gate array (FPGA). Background technique [0002] At present, the photon correlator used in photon correlation spectroscopy obtains the autocorrelation function of the single-point scattered light intensity signal, and then obtains the size and particle size distribution of the particles by the inversion algorithm program of the host computer. This type of photon correlator is measuring Accurate results are best obtained with homogeneous samples. For example, in Patent Document 1 (CN101726452A), a photon correlator based on field programmable gate array (FPGA) is provided, which can be used for hardware realization of light intensity autocorrelation function in photon correlation spectroscopy technology, and achieves sampling time, correlation Operation time is adjustable, and the numbe...

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Problems solved by technology

[0003] However, for inhomogeneous samples, such as measuring proteins with chemical reactions in space or nanospheres with uneven temperature distribution, the traditional photon correlator, which can only obtain the autocorrelation function of single-point scattered light intensity signals, cannot accurately Inversion of sample particle size and particle size distribution

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