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 > Tutorials, Help & Repairs



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



Reply
 
LinkBack Thread Tools Display Modes
Old 09-30-2008, 06:57 PM #1
gregorio87's Avatar
Class 1 Laser
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
gregorio87 gregorio87 is offline
Class 1 Laser
gregorio87's Avatar
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
Default Laser thermometer

Hi to all!
Anyone known how the laser thermometers work?
How they can discover the temperature of a surface? By the reflection of the light?



Gregorio


gregorio87 is offline   Reply With Quote







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







Old 09-30-2008, 07:03 PM #2
Class 2 Laser
 
Join Date: Jul 2008
Posts: 281
Rep Power: 12
ArRaY will become famous soon enoughArRaY will become famous soon enough
ArRaY ArRaY is offline
Class 2 Laser
 
Join Date: Jul 2008
Posts: 281
Rep Power: 12
ArRaY will become famous soon enoughArRaY will become famous soon enough
Default Re: Laser thermometer

Do you mean the thermophile lpm heads?

They absorb all the laser light, and then compute the power by measuring how quickly the temperature rises... Thatīs what I think.

ArRaY
ArRaY is offline   Reply With Quote
Old 09-30-2008, 07:24 PM #3
gregorio87's Avatar
Class 1 Laser
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
gregorio87 gregorio87 is offline
Class 1 Laser
gregorio87's Avatar
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
Default Re: Laser thermometer

Quote:
Originally Posted by ArRaY
Do you mean the thermophile lpm heads?

They absorb all the laser light, and then compute the power by measuring how quickly the temperature rises... Thatīs what I think.

ArRaY
But then the laser light has to be reflected back to the thermometer... Right?
gregorio87 is offline   Reply With Quote
Old 09-30-2008, 07:28 PM #4
Class 1 Laser
 
Join Date: Dec 2007
Posts: 71
Rep Power: 10
spensa is on a distinguished road
spensa spensa is offline
Class 1 Laser
 
Join Date: Dec 2007
Posts: 71
Rep Power: 10
spensa is on a distinguished road
Default Re: Laser thermometer

You mean a infrared thermometer correct? I think that Array is talking about a laser power meter.
Here is how an infrared thermometer, I hope that's what you mean http://en.wikipedia.org/wiki/Infrared_thermometer
spensa is offline   Reply With Quote
Old 09-30-2008, 07:31 PM #5
gregorio87's Avatar
Class 1 Laser
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
gregorio87 gregorio87 is offline
Class 1 Laser
gregorio87's Avatar
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
Default Re: Laser thermometer

Quote:
Originally Posted by spensa
You mean a infrared thermometer correct? *I think that Array is talking about a laser power meter.
Here is how an infrared thermometer, I hope that's what you mean http://en.wikipedia.org/wiki/Infrared_thermometer

I don't mean the laser power meter, I know how they work
But I have seen a pic where a man shine a red laser dot of a thermometer on a surface, and the thermometer write the temp. But thanks for the link of Wiki
gregorio87 is offline   Reply With Quote
Old 09-30-2008, 07:41 PM #6
Class 1 Laser
 
Join Date: Dec 2007
Posts: 71
Rep Power: 10
spensa is on a distinguished road
spensa spensa is offline
Class 1 Laser
 
Join Date: Dec 2007
Posts: 71
Rep Power: 10
spensa is on a distinguished road
Default Re: Laser thermometer

Yeah I think that is an infrared thermometers many have laser aiming. (see previous link for how it works)
spensa is offline   Reply With Quote
Old 09-30-2008, 08:08 PM #7
thesk8nmidget's Avatar
Class 3R Laser
 
Join Date: Jul 2008
Location: Eugene OR
Posts: 1,415
Rep Power: 92
thesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond repute
Send a message via MSN to thesk8nmidget
thesk8nmidget thesk8nmidget is offline
Class 3R Laser
thesk8nmidget's Avatar
 
Join Date: Jul 2008
Location: Eugene OR
Posts: 1,415
Rep Power: 92
thesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond reputethesk8nmidget has a reputation beyond repute
Send a message via MSN to thesk8nmidget
Default Re: Laser thermometer

i need to buy one of these. anyone wanna sell me one? for under 30? lol

pm me if you do
__________________
-Josh
thesk8nmidget is offline   Reply With Quote
Old 09-30-2008, 09:38 PM #8
Bionic-Badger's Avatar
Class 4 Laser
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Bionic-Badger Bionic-Badger is offline
Class 4 Laser
Bionic-Badger's Avatar
 
Join Date: Oct 2007
Location: Oregon, USA
Posts: 5,478
Rep Power: 3157
Bionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond reputeBionic-Badger has a reputation beyond repute
Default Re: Laser thermometer

Get one on Deal Extreme (okay, it's$ 32, not < $30).
__________________
You must spread some Reputation around before giving it to <person> again.
Bionic-Badger is offline   Reply With Quote
Old 10-01-2008, 01:21 AM #9
GooeyGus's Avatar
Class 3B Laser
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 970
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
GooeyGus GooeyGus is offline
Class 3B Laser
GooeyGus's Avatar
 
Join Date: Mar 2008
Posts: 2,673
Rep Power: 970
GooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond reputeGooeyGus has a reputation beyond repute
Send a message via AIM to GooeyGus Send a message via MSN to GooeyGus
Default Re: Laser thermometer

The laser on &quot;laser thermometers&quot; (actually IR thermometers) are just for pointing, the actual mechanism for measuring the temp is an infrared sensor.

It measures infrared given off by an object, determining the temperature.

EDIT: Here, I found an article on wikipedia describing how they work:

http://en.wikipedia.org/wiki/Infrared_thermometer

EDIT AGAIN: I should read the post all the way through before I post... Someone beat me to the answer ;D
GooeyGus is offline   Reply With Quote
Old 10-01-2008, 11:12 PM #10
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 239
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
pullbangdead pullbangdead is offline
Class 3R Laser
pullbangdead's Avatar
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 239
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
Default Re: Laser thermometer

There is such thing as reading temperature using lasers, but it's a heck of a lot more complicated. A recent Ph.D grad at my university did his dissertation on the subject. Basically, they wanted a way to measure the temperature of the actual pieces of metal, at exact places, inside of a running jet engine, aka measure the temperature at exact places along each turbine blade while the engine is running. You can imagine using an IR sensor to look into the temperature of a jet engine isn't exactly practical, and you can never hit exact spots that well. You get heat coming from the gases as well, but you want to see the temperature actually being experienced at the surface of the turbine blade itself. (Since turbines these days run at temperatures where the surface is hotter than the melting point of the metal in the middle of the blade, it's nice to know just how close to melting the whole thing you really are. But that's another whole conversation about the awesomeness of materials science and growing single-crystal nickel super alloy turbine blades and thermal barrier coatings to run them at higher-than-melting-temperature.)

So they dope the thermal barrier coating, or even put another coating on the thermal barrier coating with the dopant, on the turbine components. The dopant is one that is specifically chosen such that it will fluoresce under laser radiation from a powerful laser. The dopant is also specfically chosen based on how it fluoresces. The basic idea is that the laser light knocks electrons bound to the dopant atoms up an energy level, but those electrons have different possible paths back to ground, just like all electrons that are kicked up in energy. The dopant atoms are chosen such there is a spontaneous light emission path to ground, and a non-radiative path back to ground, and that the rate for each of these depends on temperature.

So basically, within the proper temperature regime (depending on the dopant), the rates for the 2 different paths to ground will change dependent upon the temperature. The fluoresce rate won't change, but since the non-radiative recombination rate will change, the number of electrons that take that path instead of the fluorescence path will change, thereby changing the intensity of emitted light depending on the temperature. So you hook up a spectrometer to look at the light coming out, and you can correlate the intensity of fluorescence-based light emission to the temperature at the exact spot that the laser hit based on previously-established correlation ratios, ratios that you get by testing in a less-harsh environment like an oven, or by calculating rate equations for the different paths to ground.

Pulse the laser at the appropriate rate, and you hit the same spot on each and every blade of the turbine and have the temperature on each one, and you can do the same at different distances from the center of the turbine. Knowing the real temperatures at each point, you know the real limits of what you can and can't do in turbine design and operation based on the available materials.

So you CAN use laser light to measure temperature, but it's not trivial, and not really worth it except in extreme circumstances.
pullbangdead is offline   Reply With Quote
Old 10-02-2008, 02:22 PM #11
gregorio87's Avatar
Class 1 Laser
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
gregorio87 gregorio87 is offline
Class 1 Laser
gregorio87's Avatar
 
Join Date: Jun 2008
Posts: 92
Rep Power: 10
gregorio87 is on a distinguished road
Default Re: Laser thermometer

Quote:
Originally Posted by pullbangdead
There is such thing as reading temperature using lasers...
Wow it's so complicated, but is very beautiful &quot;thermometer&quot; for the jet engines.
Is true. All is possible with the laser light... LOL
gregorio87 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 12:45 AM.


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