LPF Donation via Stripe | LPF Donation - Other Methods
Links below open in new window
ArcticMyst Security by Avery
Laser/Water.....need advice please.
- Thread starter New Guy
- Start date
- Joined
- Feb 5, 2008
- Messages
- 6,252
- Points
- 83
Your question is very ... unlogical.
"In what mirror would I see myself best?" <- just about the same.
Any laser will reflect of any reflective surface obviously.
Depending on what you application requires, you should have two primary choices,
Red laser would be best if there is very long range needed as reddies have lowest divergence,
Green laser would be best for visibility if that is what's needed, but they will diverge more and maybe some small sensors will be useless at longer ranges.
If you post your question correctly, then it will be answered appropriately
"In what mirror would I see myself best?" <- just about the same.
Any laser will reflect of any reflective surface obviously.
Depending on what you application requires, you should have two primary choices,
Red laser would be best if there is very long range needed as reddies have lowest divergence,
Green laser would be best for visibility if that is what's needed, but they will diverge more and maybe some small sensors will be useless at longer ranges.
If you post your question correctly, then it will be answered appropriately
daguin
0
- Joined
- Mar 29, 2008
- Messages
- 15,989
- Points
- 113
If you post your question correctly, then it will be answered appropriately
Uh Oh! You are starting to really sound like a vet now
Peace,
dave
- Joined
- Feb 5, 2008
- Messages
- 6,252
- Points
- 83
I hang around you a lot, ProfessorUh Oh! You are starting to really sound like a vet now
Peace,
dave
I never get tired of reading your posts. They are almost poetically written.
Joy to read.
Naturally, I started writing in the same manner.
But let's get back to the thread and wait for the OP to explain more throughly what purpose will his laser serve.
Reflection of water surface could range from simple joy-to-observe reflection effect, to measuring tiny water movement and calculation of complex processes I don't even know about.
In any case, I think that red direct diode system will do, lowest price per milliwatt and focusability/divergence fits most needs.
But he needs to tell us that himself.
- Joined
- Nov 7, 2008
- Messages
- 5,725
- Points
- 0
Your question is very ... unlogical.
"In what mirror would I see myself best?" <- just about the same.
Any laser will reflect of any reflective surface obviously.
Depending on what you application requires, you should have two primary choices,
Red laser would be best if there is very long range needed as reddies have lowest divergence,
Green laser would be best for visibility if that is what's needed, but they will diverge more and maybe some small sensors will be useless at longer ranges.
If you post your question correctly, then it will be answered appropriately
Diode lasers tend to have the best divergence, not just red lasers. A blu-ray or single-mode IR diode will have the exact same divergence potential as a red diode. I say potential because how much divergence the laser has depends on your optics and how well you adjust them. Their usefulness in this application depends on the type of sensor used and it's sensitivity to the wavelength in question. An invisible IR laser could work very well if an IR sensor is used. You are correct in that a single-mode diode laser would be best if low divergence is required.
5chars
Last edited:
- Joined
- Feb 5, 2008
- Messages
- 6,252
- Points
- 83
Oh, thanks for adding that dude, although you could have placed the orange part below the quote of my post, not in it.
People reading the thread might get confused.
But you are apsolutely right.
IR would also work as well, even cheaper than red per mW, However blurays would be very expensive for that matter.
But, I stand corrected :beer:
- Joined
- Nov 7, 2008
- Messages
- 5,725
- Points
- 0
^Really you've never seen anyone quote like that before? It's not exactly uncommon.. Changed it.
Last edited:
- Joined
- Nov 7, 2008
- Messages
- 5,725
- Points
- 0
As long as your detector is sensitive enough, any laser will work. Since the surface of water isn't perfectly reflective, most of your power will continue past the surface and be absorbed so you'll want to use a fairly powerful laser. The small amount that is reflected is what you'll be detecting. Divergence is irrelevant unless the water is perfectly smooth, and I mean perfectly. Any disturbance at all and the laser beam will lose all collimation and become random in terms of power distribution and direction..
Bluefan
0
- Joined
- Aug 15, 2009
- Messages
- 1,443
- Points
- 48
Take a large angle of incidence, this will increase the reflection. The reflection is then also polarisation dependent. The reflection at normal incidence will be relatively small.
Im not sure about all the fun involved with Divergence, but yea the angle would be 90 degrees and the liquid would not be completely still, although atmospheric so not mush movement there. I would love to use Infrared, sonar, or radar, but from what I understand you cant focus them into a beam. They spread into a cone and thats no good for me.
- Joined
- Apr 26, 2010
- Messages
- 4,175
- Points
- 83
Uh Oh! You are starting to really sound like a vet now
Peace,
dave
"But Sir...?"
"Did I hear a 'Yes Master Sgt?!?"
"N...yes sir!"
HAHA! Sorry, just wanted to comment on that.
