Reactivity measurement using pseudo-random source excitation

Stern, Tina; Valat, J.

doi:10.1016/0368-3230(62)90166-0

Cited by 11 publications

(8 citation statements)

References 5 publications

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“…[25][26][27] Alternatively, such sequences are referred to as pseudo-noise sequences or m-sequences. 25 Particular methods for generation of pseudo-random sequences 28,29 were developed in connection with communication and encryption processes, 30 acoustics 31 , and pseudo-random chopping of a beam in time-of-flight experiments with slow neutrons [32][33][34][35][36][37] and molecular beams. [38][39][40] The maximum duty cycle (relative number of 1's and 0's) of approximately 50%…”

Section: Bpr Sequences and Arraysmentioning

confidence: 99%

“…URAs are widely used as optimal mask patterns for coded aperture imaging techniques. 26 Analogous to the time-of-flight technique based on 1D BPR sequence chopping, [32][33][34][35][36][37][38][39][40] 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. [42][43][44] Similar to the 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.…”

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confidence: 99%

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Calibration of the modulation transfer function of surface profilometers with binary pseudo-random test standards: expanding the application range

et al. 2010

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A modulation transfer function (MTF) calibration method based on binary pseudo-random (BPR) gratings and arrays [Proc. SPIE 7077-7 (2007), Opt. Eng. 47(7), 073602-1-5 (2008)] has been proven to be an effective MTF calibration method for a number of interferometric microscopes and a scatterometer [Nucl. Instr. and Meth. A 616, 172-82 (2010]. Here we report on a significant expansion of the application range of the method. We describe the MTF calibration of a 6 inch phase shifting Fizeau interferometer. Beyond providing a direct measurement of the interferometer's MTF, tests with a BPR array surface have revealed an asymmetry in the instrument's data processing algorithm that fundamentally limits its bandwidth. Moreover, the tests have illustrated the effects of the instrument's detrending and filtering procedures on power spectral density measurements. The details of the development of a BPR test sample suitable for calibration of scanning and transmission electron microscopes are also presented. Such a test sample is realized as a multilayer structure with the layer thicknesses of two materials corresponding to BPR sequence. The investigations confirm the universal character of the method that makes it applicable to a large variety of metrology instrumentation with spatial wavelength bandwidths from a few nanometers to hundreds of millimeters.

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Section: Bpr Sequences and Arraysmentioning

confidence: 99%

mentioning

confidence: 99%

Calibration of the modulation transfer function of surface profilometers with binary pseudo-random test standards: expanding the application range

et al. 2010

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“…The signal may be expressed in terms of the TOF spectrum geT) as (2) where T=Lv-l and g(T)=f(v)lavjaTI. The signal may be expressed in terms of the TOF spectrum geT) as (2) where T=Lv-l and g(T)=f(v)lavjaTI.…”

Section: Theorymentioning

confidence: 99%

A Cross Correlation Chopper for Molecular Beam Modulation

Hirschy

Aldridge

1971

Review of Scientific Instruments

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“…In the absence of noise it is only superior for channels in which the total count is at least twice the average signal per channel. 2 This PR-TOF technique, first proposed and developed for the TOF analysis of thermal neutrons, [3][4][5][6] has been subsequently applied to the TOF measurement of neutral molecular beams, either directly 7 or scattered from molecules 8 or surfaces, 9,10 since their detection usually suffers from large background problems. A short overview of the PR-TOF technique can be found in Ref.…”

Section: Introductionmentioning

confidence: 99%