Glossary entry (derived from question below)
French term or phrase:
Le flux est de 55°/60°
English translation:
the spread of the light beam is about 55°/60°
Added to glossary by
claude-andrew
Feb 13, 2014 19:30
10 yrs ago
2 viewers *
French term
France
Bilingual scientist English French
Native in: English 
Works in: English to French, French to English, English
Le flux est de 55°/60°
French to English
Tech/Engineering
Manufacturing
Fibre optic lighting
I suppose they mean % transmission, but I'd appreciate confirmation in case I'm missing something:
Le flux d’une fibre sans accessoire optique et suivant polissage est de 55°/60°
Le flux d’une fibre sans accessoire optique et suivant polissage est de 55°/60°
Proposed translations
(English)
| 3 | the spread of the light beam is about 55°/60° |
Daryo
|
Change log
Feb 13, 2014 20:15: Françoise Vogel changed "Language pair" from "English to French" to "French to English"
Proposed translations
1 day 18 hrs
Selected
the spread of the light beam is about 55°/60°
or the beam spread is about 55°/60°
or the beam angle is about 55°/60°
Assuming that it's about the light diffused at the end of the optical fibre.
"... When light leaves a flashlight or a light fixture, it spreads out and becomes wider as the distance increases. Beam spread is an industry term for the amount of light diffusion, or spreading of the beam. Manufacturers use specific measurements of beam spread including beam and field angles, and publish bulletins with these data for comparison.
Beam angle is the value that shows the angle of beam spread from the middle of the beam. This is measured by drawing an imaginary line out from the center of the light bulb, which is the center of the light beam. The angle is observed where the light intensity at the outside of the beam has dropped to 50 percent of the maximum light. The beam angle will be narrow for a spotlight designed to light smaller areas, and will be wider for a floodlight used for lighting larger areas.
Field angle is a standard measurement of the angle from the imaginary centerline of the beam to a point where the light intensity is low. Manufacturers normally check the field angle when the light intensity has been reduced to 10 percent of maximum. This angle is sometimes called the cut-off angle, but the intent is to show the effective lighting area of a light bulb or fixture design. ..."
[http://www.wisegeek.com/what-is-a-beam-spread.htm]
or the beam angle is about 55°/60°
Assuming that it's about the light diffused at the end of the optical fibre.
"... When light leaves a flashlight or a light fixture, it spreads out and becomes wider as the distance increases. Beam spread is an industry term for the amount of light diffusion, or spreading of the beam. Manufacturers use specific measurements of beam spread including beam and field angles, and publish bulletins with these data for comparison.
Beam angle is the value that shows the angle of beam spread from the middle of the beam. This is measured by drawing an imaginary line out from the center of the light bulb, which is the center of the light beam. The angle is observed where the light intensity at the outside of the beam has dropped to 50 percent of the maximum light. The beam angle will be narrow for a spotlight designed to light smaller areas, and will be wider for a floodlight used for lighting larger areas.
Field angle is a standard measurement of the angle from the imaginary centerline of the beam to a point where the light intensity is low. Manufacturers normally check the field angle when the light intensity has been reduced to 10 percent of maximum. This angle is sometimes called the cut-off angle, but the intent is to show the effective lighting area of a light bulb or fixture design. ..."
[http://www.wisegeek.com/what-is-a-beam-spread.htm]
Note from asker:
| Many thanks for your contribution. |
4 KudoZ points awarded for this answer.
Comment: "Thanks Daryo"
Discussion
Anyway, what company would boast in its catalogue that they're using optic fibre that can transmit only about 55% of light on a short distance?
It must be some angle - of the light dispersed at the end of the optic fibre?
http://www.eso.org/projects/caos/fibre/fibre.html
n F/10 telescope beam is launched into the fibre. The fibre output end is distributed in cones with apertures F/2.2, F/6 and F/10. In this particular case, only 60% of the total output flux will leave the fibre in an F/10 cone, 40 % is lost by FRD! At bigger apertures, like F/6, 85% of the flux will be collected.
http://spectroscopy.wordpress.com/2009/04/03/characterizatio...