Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dead time effects in laser Doppler anemometry measurements   We present velocity power spectra computed by the so-called direct method
from burst type laser Doppler anemometer (LDA) data, both measured in a
turbulent round jet and generated in a computer. Using today's powerful
computers we have been able to study more properties of the computed spectra
than was previously possible, and we noted some unexpected features of the
spectra that we now attribute to the unavoidable influence of a finite
measurement volume (MV). The most prominent effect, which initially triggered
these studies, was the appearance of damped oscillations in the higher
frequency range, starting around the cut-off frequency due to the size of the
MV. Using computer generated data mimicking the LDA data, these effects have
previously been shown to appear due to the effect of dead time, i.e., the
finite time during which the system is not able to acquire new measurements.
These dead times can be traced back to the fact that the burst-mode LDA cannot
measure more than one signal burst at a time. Since the dead time is
approximately equal to the residence time for a particle traversing a
measurement volume, we are dealing with widely varying dead times, which,
however, are assumed to be measured for each data point. In addition, the
detector and processor used in the current study introduce a certain amount of
fixed processing and data transfer times, which further contribute to the
distortion of the computed spectrum. However, we show excellent agreement
between a measured spectrum and our modeled LDA data thereby confirming the
validity of our model for the LDA burst processor.

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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: stat