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retard

English translation: delay time

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)

French term or phrase:	retard
English translation:	delay time
Entered by:	cc in nyc

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17:22 Jul 13, 2011

French to English translations [PRO]
Science - Chemistry; Chem Sci/Eng

French term or phrase: retard

Hello. I am struggling with the notion of "retard" in relation to the study of waves. I thought perhaps it referred to a time delay, but then I saw that it was being represented with the Greek symbol tau, which is used for the period of a wave.
Here is the first example of the term in my text:
"L’analyse de la propagation de proche en proche d’une perturbation dans un milieu à une dimension lorsque l’amortissement est négligeable conduit à la notion de retard: la perturbation en un point de l’espace à un instant donné est la même que ce qu’elle était en un autre point à un instant antérieur."
Here are further examples:
"Notion d’onde progressive à une dimension.
Notion de retard: la perturbation au point M à l’instant t est celle qui existait auparavant en un point M’ à l’instant t’= t- τ avec v = M’M/v, v étant le retard et v la célérité (pour les milieux non dispersifs)"

"Utiliser un dispositif expérimental pour mesurer un retard ou une distance lors de la propagation d’une onde. En particulier utiliser un oscilloscope pour mesurer le retard d’un clap sonore ou d’une salve d’ultrasons."
Any suggestions would be very much apprecited, thanks :)

Aoifekenn KudoZ activity Questions: 19 (1 open) (1 without valid answers) (1 closed without grading) Answers: 0
Local time: 08:34

delay time

Explanation:
Waves/chemistry not my field, but here are some references:

"We investigate the effects of wave localization on the delay time tau (frequency sensitivity of the scattering phase shift) of a wave transmitted through a disordered wave guide."
http://arxiv.org/abs/cond-mat/0103113

"Photons with wave-vector k(b) arriving after a delay time tau(d) that is smaller than the dephasing time T(2( of the polarization produce an interference grating." [brackets used for subscripts]
http://www.physik.uni-marburg.de/of/dynamics/shdiff.html

So perhaps "delay time" is right. ;-)

Selected response from:

cc in nyc
Local time: 03:34

Grading comment

Thanks :)
4 KudoZ points were awarded for this answer

Summary of answers provided

3 +2

delay time

cc in nyc

lag, time lag

MartinPorto

Discussion entries: 5

Answers

17 mins confidence:

peer agreement (net): +2

delay time

cc in nyc
Local time: 03:34
Native speaker of: English
PRO pts in category: 7

Grading comment

Thanks :)

30 mins confidence:

lag, time lag

Explanation:
delay time could be confused with the scope settings! according to the Routledge technical, lag is suggested

MartinPorto
Portugal
Local time: 08:34
Native speaker of:

English

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Changes made by editors

Aug 29, 2011 - Changes made by cc in nyc:
Created KOG entry	KudoZ term => KOG term

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retard

English translation: delay time

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retard

English translation: delay time

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KudoZ™ translation helpThe KudoZ network provides a framework for translators and others to assist each other with translations or explanations of terms and short phrases.

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