The Fourier method in slow neutron time-of-flight spectrometry

Virjo, A.

doi:10.1016/0029-554x(69)90205-5

Cited by 20 publications

(6 citation statements)

References 2 publications

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“…It may be the correlation spectroscopy with pseudo-random flux modulation [25][26][27][28][29][30][31][32][33] or Fourier spectroscopy with periodic or quasiperiodic flux modulation [34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Time-of-flight Fourier UCN spectrometer

Kulin

Frank

Goryunov

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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We describe a new time-of-flight Fourier spectrometer for investigation of UCN diffraction by a moving grating. The device operates in the regime of a discrete set of modulation frequencies. The results of the first experiments show that the spectrometer may be used for obtaining UCN energy spectra in the energy range of 60÷200 neV with a resolution of about 5 neV. The accuracy of determination of the line position was estimated to be several units of 10 −10 eV

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Section: Introductionmentioning

confidence: 99%

Time-of-flight Fourier UCN spectrometer

Kulin

Frank

Goryunov

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…In the pseudo-random method, the beam intensity is modulated with a periodic binary pseudo-random signal (figure 1(A)) and the time-of-flight spectrum is calculated as the cross-correlation of the modulation signal and the detector output [2]. The Fourier diffractometer involves modulation of the neutron beam by a fast Fourier chopper [3] (figure 1(B)) which is a rotating disc (rotor) with a pattern of alternating neutron absorbing and neutron transparent slits; and a fixed system of identical slits (stator). The method consists of measuring the Fourier transform of the time-of-flight spectrum at several discrete frequencies and forming the spectrum itself by Fourier synthesis from the measured frequency components.…”

Section: Tof Methodsmentioning

confidence: 99%

A USB-based data acquisition system for neutron TOF measurements

Khalil¹

2005

Meas. Sci. Technol.

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A universal serial bus (USB)-based data acquisition system for neutron time-of-flight (TOF) spectrum measurements is designed and tested at the Cairo Fourier diffractometer facility (CFDF). The system acquires the time of arrival of each digital pulse from the four-detector system together with the relevant detector identification number. The real time of the pick-up signal events is also acquired. This real-time stamp could be used for performing the cross-correlation functions separately with the neutron intensity signal coming out from each detector element. The board communicates with the computer through the USB at a data transfer rate of 1 MB s−1. The initial tests show that the new design can replace the current reverse time-of-flight analyser used for the CFDF and it can also be used for checking on the efficiency of each of the elements of the detector system and their associated electronics.

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“…[40][41][42] Alternatively, such sequences are referred to in literature as pseudonoise sequences or m-sequences. 40 Particular methods for generation of pseudorandom sequences 43,44 were developed in connection with communication and encryption processes, 45 acoustics, 46 and pseudorandom chopping of a beam in time-of-flight experiments with slow neutrons [47][48][49][50][51][52] and molecular beams. [53][54][55] The maximum duty cycle (relative number of 1's and 0's) of approximately 50% is obtained with a maximum-length pseudorandom sequence (MLPRS).…”

Section: Bpr Sequences and Arraysmentioning

confidence: 99%

“…URAs are widely used as optimal mask patterns for coded aperture imaging techniques. 41 Analogous to the time-of-flight technique based on 1D BPR sequence chopping, [47][48][49][50][51][52][53][54][55] an imaging technique based on the 2D URAs allows one to obtain a better signal-to-noise ratio, keeping the high angular resolution characteristic of a single pinhole aperture. [57][58][59] Similar to 1D BPR sequences, the URAs possess both high throughput (50%) and a delta-function-like cyclical autocorrelation function that corresponds to a flat 2D PSD spectrum.…”

Section: Bpr Sequences and Arraysmentioning

confidence: 99%