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Spectral analysis method for neutron pulse sequences

A pulse sequence and spectrum analysis technology, applied in the field of neutron pulse sequence spectrum analysis, can solve problems such as inability to meet analysis requirements, and achieve the effects of improving computing efficiency, reducing time, and saving computing time.

Inactive Publication Date: 2009-09-16
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, the traditional analysis method can't meet the system's real-time analysis requirement within 3.6μs

Method used

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  • Spectral analysis method for neutron pulse sequences
  • Spectral analysis method for neutron pulse sequences
  • Spectral analysis method for neutron pulse sequences

Examples

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Embodiment 1

[0026] Embodiment 1: as Figure 1 to Figure 3 Shown, a kind of frequency spectrum analysis method of neutron pulse sequence, comprises the following steps: (1) neutron pulse data is collected, obtain neutron source and the neutron detection count that is produced by the detected body excited by neutron source Time distribution, the form of the time distribution is a neutron pulse sequence composed of "0" or "1", the neutron pulse sequence is stored according to the position where the pulse occurs, and no pulse is not stored; (2) for the acquisition After the data packet is divided into blocks (totally m blocks) by the length of 1024 bytes (as n), obtain the neutron pulse original sequence x(i) in each block, i=0,1,...n -1; There is no interval between each data block; (3) Correlation calculation is performed on the data of each data block to obtain each data block or a correlation sequence between blocks; (4) Further processing is performed on each block or a correlation seque...

Embodiment 2

[0031] Embodiment 2: as Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the correlation calculation in the above-mentioned step (3) is a cross-correlation calculation, and the method of fast migration includes the following steps: a, using the sequence of two channels wherein x 1 (i) with x 2 (i) Calculate x at offset 0 1 (i) and x 2 The relevant value of (i), namely r ( 0 ) = Σ i = 0 n - 1 x 1 ( i ) x 2 ( i ) ; b. Calculate x 1 (i) with x 2 (i) The distance between the data "1" obtains the minimum distance d (d>0); set the offset count as k, k=0; c, calcul...

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Abstract

The invention relates to a spectral analysis method for neutron pulse sequences. The method comprises the following steps: (1) acquiring neutron pulse data to obtain a neutron source and the time distribution of the neutron detection counting produced by a detected body which is excitated by the neutron source; (2) partitioning the acquired data package into blocks which are continuous without intervals according to a certain length to obtain neutron pulse original sequences in the blocks; (3) carrying out relevant calculation on the data in the data blocks to obtain correlation sequences of the data blocks or among the data blocks; and (4) further calculating correlation sequences on the data blocks or among the data blocks to obtain a power spectrum. The method is characterized in that: a quick deviation method is used in the relevant calculation of the data in the data blocks in the step (3). The spectral analysis method can realize the real-time spectral analysis of the neutron pulse sequences through real time computation quick deviation algorithm and the optimization of the power spectrum calculation procedures.

Description

technical field [0001] The invention relates to a neutron pulse sequence spectrum analysis method. Background technique [0002] Neutron source-driven noise analysis measurement method, also known as power spectral density analysis measurement method (power spectral density analysis measurements), its basic principle is: first create the calculation formula of the target parameters, second rely on the experimental measurement of the original function, and quickly calculate the correlation function and power spectrum, and finally these power spectra are substituted into the established target parameter formula, so that the corresponding target parameters in the neutron radiation environment can be obtained. By constructing an experimental measurement system for high-speed data acquisition with a sampling rate up to 1 GHz, the original function, that is, the neutron pulse sequence, can be obtained. [0003] Classical methods for analyzing the spectrum of neutron pulse trains ...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01T3/00
Inventor 魏彪唐跃林任勇冯鹏米德伶潘英俊
Owner CHONGQING UNIV
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