diffraction feature

11:14 Dec 27, 2021

English to French translations [PRO]
Tech/Engineering - Patents / optics

English term or phrase: diffraction feature

Traditionally, diffraction gratings are configured such that their diffraction features are as equidistantly spaced as possible.
As per a normal phase diffraction grating, US5696584 and US5559599 describe phase diffraction gratings for optical position encoders wherein the 0th diffraction order is suppressed and the +/-lst diffraction orders are maintained. As is the case with a normal diffraction grating having regularly spaced diffraction features, US5994692 describes a diffraction grating arrangement wherein the even diffraction orders are suppressed. US5113286 also describes a grating for a digital optical System wherein the even orders are suppressed.
In the embodiment described the scale 4 is an amplitude scale (in that it Controls the amplitude of light leaving the scale toward the readhead) and comprises a substrate which has periodic features 10 in the form of dark/relatively non-
reflective lines 10 made on an otherwise relatively reflective substrate such that between the periodic features 10 the scale is relatively reflective 8. Of course, the scale’s periodic features could be made in other ways, such as for example by forming relatively reflective lines on an otherwise relatively non-reflective substrate, or even by forming both the relatively reflective and non-reflective lines on a substrate.

soumaya. KudoZ activity Questions: 83 (8 open) (6 without valid answers) (15 closed without grading) Answers: 0 Tunisia
Local time: 10:02

Summary of answers provided

4 +1

trait de diffraction

Bourth

1 +1

élément de diffraction

Tony M

Answers

4 hrs confidence:

peer agreement (net): +1

élément de diffraction

Explanation:
I believe that's the sense here, but don't know if there is a more specialist term.

Tony M
France
Local time: 11:02
Native speaker of:

English
PRO pts in category: 100

13 hrs confidence:

peer agreement (net): +1

trait de diffraction

Explanation:
A diffraction grating (réseau de diffraction) can be either transmissive or reflective. If transmissive, it has slits (so many slits per millimetre). If it is transmissive, it has grooves / ridges / rulings / lines (which reflect light), and has so many lines / grooves, etc. per mm.
If your text is about only one type of grating and you know which one, you can translate 'feature' as 'slit' or 'line/groove' as appropriate. If it is about both kinds, or if you don't know which, then it is a ''trait de diffraction'.

"a REFLECTIVE GRATING has RIDGES or RULINGS on its surface while a transmissive grating has transmissive or hollow SLITS on its surface"

"the type of grating which is currently most common in astronomy is a REFLECTIVE DIFFRACTION GRATING or reflection grating. This again exploits the wave properties of light, in this case by making adjacent sections of a wavefront travel extra distances as it is reflected off a non-uniform surface. The non-uniform surface is actually a very precisely made mirror into which STEPS OR GROOVES have been cut [...]Hence a grating with 600 GROOVES PER MILLIMETRE will have twice the dispersion"

"C'est une plaque de verre sur laquelle on a effectué un très grand nombre de STRIES parallèles (par exemple, 1500 TRAITS PAR MILLIMÈTRE). La diffraction par chacune des STRIES donne de part et d'autre de l'image centrale blanche, des images pour les différentes longueurs d'onde."

"Un RÉSEAU PAR TRANSMISSION est constitué par un très grand nombre de FENTES PARALLÈLES et ÉQUIDISTANTES. Il est souvent constitué par une lame de verre sur laquelle on a tracé un très grand nombre DE TRAITS parallèles et équidistants (de l’ordre de 500 TRAITS PAR MILLIMÈTRE !)."

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Note added at 13 hrs (2021-12-28 00:30:01 GMT)
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Whether there is any connection to the way we speak of the 'features' or 'traits' of a person's face, for example, I cannot say.

Bourth
France
Local time: 11:02
Native speaker of:

English
PRO pts in category: 7

Notes to answerer

Asker: Thank you very much for your answer. In fact, I hesitated between "trait de diffraction" and "raie de diffraction". Regarding the type of the grating : "Further still, for the sake of simplicity of illustration the ray diagrams are shown as transmissive ray diagrams (that is the light is shown as being transmitted through each of the scale and diffraction grating, whereas in reality at least one of these could be reflective)." I therefore think that "trait de diffraction" is in this case the adequate translation.

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