LLLT time exposure calculations

   
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pierre

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Total Posts: 68

Member Since:
April 2010

January 16, 2011, 03:07 PM

The story started about 4 months ago, I got an discussion with OMG via mail.
We were discussing about LLLT time exposure, I was trying to explain him that calculations on time exposure ie 20 minutes was wrong.
He told me that I was wrong and that something should be wrong in my calculations.
I have made the calculations again and I can state that OMG got it right, I was wrong.
I made a mistake on the surface calculation.

So here is the surface where I have based my calculations (a square of 100cm²) :
http://img209.imageshack.us/f/lasersurface.jpg/

So here are the good calculations right now :
According to the JPEG’s attachment, we can count on a 100cm² surface 83 diodes.

Now let’s go to the calculations :
A laser is a 5mW power
100cm² is the surface I took for calculations
20 minutes is a session time
83 is the number of diodes on a 100cm² surface

Let it go :
The amount of power on a 100cm² surface is :
83 diodes * 5mW = 415 mW

The number of seconds in 20 minutes is :
20 (minutes) * 60 (seconds) = 1200 seconds

The amount of energy on a 100cm² surface is :
415 (mW) * 1200 (seconds) = 498000 mJ (milli joule)

Let’s convert it now in J/cm² :
498000 mJ = 498 J (amount of energy on a 100cm² area)


Now reporting it into 1 cm² :
498/100 = 4,98 J


This is what we expected for around 5 J/cm².

Now this result can be related with some others details :
- have a clean dry scalp
- depending on the hair’s length/density
- etc…

 

IGNORE

 
   
 








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