Old 10-14-2014, 12:52 PM #1
Jaggions's Avatar
Class 1 Laser
 
Join Date: Mar 2014
Location: Italy
Posts: 50
Rep Power: 8
Jaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of light
Send a message via Skype™ to Jaggions
Jaggions Jaggions is offline
Class 1 Laser
Jaggions's Avatar
 
Join Date: Mar 2014
Location: Italy
Posts: 50
Rep Power: 8
Jaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of light
Send a message via Skype™ to Jaggions
Default Heat generated by a laser beam

So, let's say I turn on my 200 mW green laser and I focus it. If I put some black paper into the focus of the beam, the paper will burn. There's nothing new in this.
But what's the actual heat generated by the beam over the piece of paper? Is there a way to calculate it?


__________________
About me: http://jacopojannone.com
Jaggions is offline   Reply With Quote










Old 10-14-2014, 02:44 PM #2
GatoX's Avatar
Class 1 Laser
 
Join Date: Jun 2014
Location: Spain, Madrid
Posts: 80
Rep Power: 27
GatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond repute
GatoX GatoX is offline
Class 1 Laser
GatoX's Avatar
 
Join Date: Jun 2014
Location: Spain, Madrid
Posts: 80
Rep Power: 27
GatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond reputeGatoX has a reputation beyond repute
Default Re: Heat generated by a laser beam

Why you don't test with a thermometer and black paint? You can buy a cheap thermometer from ebay Dallas DS18B20 18B20 to 92 Thermometer Temperature Sensor Original | eBay and connect it to arduino or other board. This going to read 125 degrees how much
__________________
100mw 405nm pen-style (Broken)
Tritium vial 80mm * 5mm
Tiny host 650nm 250mw lpc 826


"Darkness doesn't exist, shadow is the light that you can't see"

I will apreciate all kind of correction to my posts, please, send me pm if you see bad expresions or grammar issues
GatoX is offline   Reply With Quote
Old 10-14-2014, 03:02 PM #3
Jaggions's Avatar
Class 1 Laser
 
Join Date: Mar 2014
Location: Italy
Posts: 50
Rep Power: 8
Jaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of light
Send a message via Skype™ to Jaggions
Jaggions Jaggions is offline
Class 1 Laser
Jaggions's Avatar
 
Join Date: Mar 2014
Location: Italy
Posts: 50
Rep Power: 8
Jaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of light
Send a message via Skype™ to Jaggions
Default Re: Heat generated by a laser beam

Quote:
Originally Posted by GatoX View Post
Why you don't test with a thermometer and black paint? You can buy a cheap thermometer from ebay Dallas DS18B20 18B20 to 92 Thermometer Temperature Sensor Original | eBay and connect it to arduino or other board. This going to read 125 degrees how much
Well, a thermometer will measure temperature, not heat. They're different things.
I'm not sure it is correct, but since
Power = Energy / Time, then
Energy = Power * Time, which means that
0.2 (W) * x (seconds) = y (J), where x is the time I keep the laser turned on and y is the heat in Joules. If from this I want to get the temperature, since
Heat = (Specific Heat) * Mass * (Temperature Variation), then
Temperature Variation = Heat / ((Specific Heat) * Mass).
I'm just not sure if this is correct.
__________________
About me: http://jacopojannone.com
Jaggions is offline   Reply With Quote
Old 10-14-2014, 04:29 PM #4
upaa27's Avatar
Class 2M Laser
 
Join Date: Jul 2013
Location: San Francisco
Posts: 626
Rep Power: 90
upaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond repute
upaa27 upaa27 is offline
Class 2M Laser
upaa27's Avatar
 
Join Date: Jul 2013
Location: San Francisco
Posts: 626
Rep Power: 90
upaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond reputeupaa27 has a reputation beyond repute
Default Re: Heat generated by a laser beam

Not sure what you mean exact,y but a laser beam has no definitive "heat". It is just energy and whatever material it hits is heated depending on how much it absorbs
upaa27 is offline   Reply With Quote
Old 10-14-2014, 11:09 PM #5
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,086
Rep Power: 5472
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,086
Rep Power: 5472
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: Heat generated by a laser beam

By "heat generated" do you mean "energy transferred to the target"?

(Beam power in watts) * (exposure duration in seconds) * (absorption percentage) = (energy in joules)
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 10-15-2014, 05:24 AM #6
Jaggions's Avatar
Class 1 Laser
 
Join Date: Mar 2014
Location: Italy
Posts: 50
Rep Power: 8
Jaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of light
Send a message via Skype™ to Jaggions
Jaggions Jaggions is offline
Class 1 Laser
Jaggions's Avatar
 
Join Date: Mar 2014
Location: Italy
Posts: 50
Rep Power: 8
Jaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of lightJaggions is a glorious beacon of light
Send a message via Skype™ to Jaggions
Default Re: Heat generated by a laser beam

Quote:
Originally Posted by Cyparagon View Post
By "heat generated" do you mean "energy transferred to the target"?

(Beam power in watts) * (exposure duration in seconds) * (absorption percentage) = (energy in joules)
Yes, and I think this answers my question. Thank you.
__________________
About me: http://jacopojannone.com
Jaggions 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
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 05:31 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