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| olliH... |
 Posted: Tue Oct 06, 2009 5:02 am |
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Guest
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Hi,
I'm looking for a high-precision & high-speed method to measure the
entrance angle of a Laser-beam.
I have a probe that is illuminated with a HeNe-laser. I would like to
equip the probe with some kind of sensor that cam measure the entrance
angle of the laser beam.
Are there any buyable sollution? Which company is selling sensors for
this application?
Thank you for your help. |
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| Helmut Wabnig... |
| Posted: Tue Oct 06, 2009 3:12 pm |
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On Tue, 6 Oct 2009 08:02:12 -0700 (PDT), olliH
<oliver.hofherr at (no spam) googlemail.com> wrote:
[quote:38ded1b82f]Hi,
I'm looking for a high-precision & high-speed method to measure the
entrance angle of a Laser-beam.
I have a probe that is illuminated with a HeNe-laser. I would like to
equip the probe with some kind of sensor that cam measure the entrance
angle of the laser beam.
Are there any buyable sollution? Which company is selling sensors for
this application?
Thank you for your help.
[/quote:38ded1b82f]
Here is the tool you need:
http://www.bildwoerterbuch.com/images/all/winkelmesser-37450.jpg
w. |
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| AES... |
| Posted: Tue Oct 06, 2009 7:07 pm |
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In article <5kcnc5t6r1np112vufqupakk0fg57fp8vn at (no spam) 4ax.com>,
Helmut Wabnig <hwabnig at (no spam) .- --- -. dotat> wrote:
[quote:227b7f57bf]I have a probe that is illuminated with a HeNe-laser. I would like to
equip the probe with some kind of sensor that cam measure the entrance
angle of the laser beam.
[/quote:227b7f57bf]
Angular spread? Or tilt angle? |
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| olliH... |
| Posted: Tue Oct 06, 2009 10:03 pm |
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The probe's tilt angle
On Oct 7, 3:07 am, AES <sieg... at (no spam) stanford.edu> wrote:
[quote:7e55280622]In article <5kcnc5t6r1np112vufqupakk0fg57fp... at (no spam) 4ax.com>,
Helmut Wabnig <hwabnig at (no spam) .- --- -. dotat> wrote:
I have a probe that is illuminated with a HeNe-laser. I would like to
equip the probe with some kind of sensor that cam measure the entrance
angle of the laser beam.
Angular spread? Or tilt angle?[/quote:7e55280622] |
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| Helpful person |
| Posted: Wed Oct 07, 2009 1:47 am |
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Joined: 22 Jun 2004
Posts: 832
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On Oct 7, 4:03 am, olliH <oliver.hofh... at (no spam) googlemail.com> wrote:
[quote:e2ca8c00b7]The probe's tilt angle
[/quote:e2ca8c00b7]
Try aligning a camera or quadrant detector with your laser detector.
Then you can easily use it to determine the tilt of the incoming beam.
www.richardfisher.com |
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| JĆ¼rgen Appel... |
| Posted: Wed Oct 07, 2009 5:20 pm |
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olliH wrote:
[quote:85f828d545]Hi,
I'm looking for a high-precision & high-speed method to measure the
entrance angle of a Laser-beam.
I have a probe that is illuminated with a HeNe-laser. I would like to
equip the probe with some kind of sensor that cam measure the entrance
angle of the laser beam.
Are there any buyable sollution? Which company is selling sensors for
this application?
[/quote:85f828d545]
A simple lens converts the beam direction into a position of the laser spot
in the focal plane. Put a quadrant-detector or a CCD chip there, but make
sure that your focused spot is bigger than the gap between the light
sensitive areas.
This will bring you close to the shot noise limited angle sensitivity.
JĆ¼rgen |
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| olliH... |
| Posted: Wed Oct 07, 2009 10:34 pm |
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hi,
thank you for the ideas.
The angular aperture should be as big as possible. Good would be +/-
30°.
What about using a DOE like a grating to have more spots for sensing
the position?
Where do I have to put the focus when I use a DOE |
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