Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Experiments & Modifications



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 02-10-2009, 02:29 PM #1
Junior Member
 
Join Date: Feb 2009
Posts: 3
Rep Power: 0
freevryheid is on a distinguished road
freevryheid freevryheid is offline
Junior Member
 
Join Date: Feb 2009
Posts: 3
Rep Power: 0
freevryheid is on a distinguished road
Default Splash & spray experiment

Can somebody please point me in the right direction.

I'd like to do an experiment to measure the spray that comes off car tires traveling in the rain. I thought about rigging up a small system consisting of a laser, collimating lenses and a light sensor to measure the intensity of the laser through the water spray. Any suggestions as to what laser and light sensors (and vendors if you know any) would be appropriate for this type of application. The laser will travel the width of a car/truck tire ~ 200 mm max. I'm thinking to hook the light cells to a multimeter to check the drop in light intensity as the laser passes through the water spray/fog. I've never worked with this before and am on a very low budget. Any help is appreciated.


freevryheid is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 02-10-2009, 02:35 PM #2
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,701
Rep Power: 39577
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,701
Rep Power: 39577
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: Splash & spray experiment

First off.... Welcome to the Forum...

We would need a bit more info.....
What is it used for....
What actually are you wanting to detect...
(Volume of spray.... density of spray....color of spray.... the existance of
spray... and so on....:-? :-? :-?)
And why specifically do you need a Laser... :-?

Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee is offline   Reply With Quote
Old 02-10-2009, 02:46 PM #3
Junior Member
 
Join Date: Feb 2009
Posts: 3
Rep Power: 0
freevryheid is on a distinguished road
freevryheid freevryheid is offline
Junior Member
 
Join Date: Feb 2009
Posts: 3
Rep Power: 0
freevryheid is on a distinguished road
Default Re: Splash & spray experiment

Thanks for the welcome !

I considered using a laser as it (will?) give me better control over pointing direction. I also suspect that the beam from a flashlight may be too dispersed by the water fog/spray. I want to use the light intensity measurement as an indirect measurement of the "density" of spray. Some road surfaces are more porous than others and would not generate as much spray - I'm looking to quantify this effect. One way would be to collect the amount of water coming off the tire - I think using light measurements is a more practical approach.
freevryheid is offline   Reply With Quote
Old 02-10-2009, 03:33 PM #4
Class 1 Laser
 
Join Date: Aug 2008
Posts: 79
Rep Power: 9
Viracocha is on a distinguished road
Viracocha Viracocha is offline
Class 1 Laser
 
Join Date: Aug 2008
Posts: 79
Rep Power: 9
Viracocha is on a distinguished road
Default Re: Splash & spray experiment

Wouldn't a laser only give you a small cross section of the spray and therefore change value depending on the direction of spray and car speed?
Also laser light might act funny around the water droplets and as refraction through a large droplet or blocking by a stone could alter the results you'll need a way to store them and make an average.

sounds like a fun experiment though
Viracocha is offline   Reply With Quote
Old 02-10-2009, 03:49 PM #5
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,701
Rep Power: 39577
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,701
Rep Power: 39577
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: Splash & spray experiment

Thanks for sharing your criteria...
Using light as a detection system would create a lot of variations...
(ambient light... road grime...etc)... but I suppose over the same stretch of
road on the same day at the same or near time stamp the reading variables
would be minimal..

Not to forget... your laser and sensor would be neat the spay and will themseves
be variable by the amount of water/dirt on the lenses.

Maybe directing the spray towards a container to be measured after or on
the the fly... That would get rid of a few variables...IMO..

Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee is offline   Reply With Quote
Old 02-10-2009, 03:57 PM #6
Junior Member
 
Join Date: Feb 2009
Posts: 3
Rep Power: 0
freevryheid is on a distinguished road
freevryheid freevryheid is offline
Junior Member
 
Join Date: Feb 2009
Posts: 3
Rep Power: 0
freevryheid is on a distinguished road
Default Re: Splash & spray experiment

Quote:
Originally Posted by Viracocha
Wouldn't a laser only give you a small cross section of the spray
Yep, I've considered this - hence the need for 2 collimating lenses - one to spread the beam and another to refocus it. I'm not sure how effective this will be though. Since I'll be doing the measurements in the vicinity of the tire, the direction of the spray should not be an issue (I'm guessing). Yes, testing will need to be done at a constant speed, say 60 mph. Another idea is to video a black & white image behind the spray and to determine the average RGB values from the video bitmaps as a measure of the spray volume. This requires more work though and an expensive waterproof camera beneath a tire traveling at 60 mph. I've googled and see one can pick up small lasers and light sensors for next to nothing, I'm just not sure what would be the right equipment for this type of system.
freevryheid is offline   Reply With Quote
Old 02-10-2009, 11:01 PM #7
Class 3B Laser
 
Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 219
Hallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond repute
Send a message via MSN to Hallucynogenyc
Hallucynogenyc Hallucynogenyc is offline
Class 3B Laser
 
Join Date: Jan 2009
Location: Spain, tarragona
Posts: 3,635
Rep Power: 219
Hallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond reputeHallucynogenyc has a reputation beyond repute
Send a message via MSN to Hallucynogenyc
Default Re: Splash & spray experiment

There are so many variables , even the color of the road will change the readings, maybe by just measuring the ammount of red light from a picture taken by a camera...

anyways I dont think thats a good method ;p

edit: the ammount of water in the road will change with every meter so how to put the same place with diferent roads but with the same ammount of water?

I'd forget about that
__________________
The difference between an ignorant and a wise is that the wise knows the limits of his knowledge while the ignorant ignores the limits of his ignorance.
Learn how to use Opera and tell me about your experience here!


Wicked Lasers Evolution Pro 130mW ------------------> Review
Rayfoss 150mW waterproof
Rayfoss 200mW focusable torch -----------------------> Review
Dealextreme 5mW true laser pointer
Dealextreme 50mW true laser pointer
Dealextreme 100mW true laser pointer
Laserlands 30mW disco laser --------------------------> Review
5mW pointers (many of them)
DX 200mW Red laser (Dilda) --------------------------> Review
120mW PHR custom build
200mW GGW custom build

Focalprice 7$ green&bluray laser goggles
Dealextreme tripod and clamp for laser holding -----> Review
DIY 3 motor Spirograph --------------------------------> Review
HLPM-2 laser power meter
Hallucynogenyc is offline   Reply With Quote
Old 02-11-2009, 01:21 AM #8
Class 1 Laser
 
Join Date: Aug 2008
Posts: 79
Rep Power: 9
Viracocha is on a distinguished road
Viracocha Viracocha is offline
Class 1 Laser
 
Join Date: Aug 2008
Posts: 79
Rep Power: 9
Viracocha is on a distinguished road
Default Re: Splash & spray experiment

If you want to use light for this you might be better off using a difuse light source like a flourescent tube behind a bit of white perspex on one side of the rear of the wheel and a solar panel on the other side, then wrap the whole thing in a box so the only light is from the difuse source.
A couple of guides on ether side of the wheel to keep the spray off the light and solar panel, and you should get fairly constant readings. Although this may only work to indicate the amount of dirt that is sprayed by the wheels as the water could refract rather then block the light.

Lasers are very precise and this seems like a very unprecise requirement, the two just maybe uncompatable.
Viracocha is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 11:35 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC