Old 09-27-2012, 04:50 PM #1
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Default Looking for a 1305 / 1300 nm laser

This is a quite long question.

Introduction, I'm looking to build a methane gas meter.
NOT a flow meter but a concentration meter.... (biogas is composed of methane and carbon dioxide bla bla bla)

Commercial one are a little to expensive for my budget, so i'll try to build one...

The task is "easy"

First some chem -> IR Spectra Zoom

So i need something that can emit in the 1300 or 1305 range...

CNI don't have, commercial site listend as good on that forum neither..

So i've looked around, I can found the single diode for the 1300
(1300 nm Edge-Emitting LED | OSI Laser Diode Inc.
and
Frankfurt Laser Company - FLC (1300nm-3100nm) for example....)

But nothing in the 1305 nm showed up.

So i'll try to take a very "wide" laser diode and couple with an infrared narrow bandpass filter. (narrow-band interference filter | Optical components)

Additional details, laser is stationary, power level is not important and i've read http://laserpointerforums.com/f51/i-...ead-52972.html

Do I'm missing something to have "something" that emit energy in at 1305nm ?

<--> SIDE <--> NOTE <-->
Calibration and other precision related stuff is not a problem.

Laser beam will be split by a pellicle mirror, one beam across free air and two high grade first miror, and one trough biogas (say a one meter pipe ?), at the end a LaserBee 2.5W USB will read each one alternatively, computer will do the rest...
Sadly LaserBee is not guaranteed to measure the wavelenght in the1300 nm range.


So the only thing I need to know is
The exact ratio of the split of the pellicle mirror.
how much a laser beam passing trough 100% methane gas is reduced.
how much a laser beam passing trough 0% methane gas is reduced (pipe wall ecc)


And of course a minimum of 5 second signal stability!


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Old 09-27-2012, 08:40 PM #2
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Default Re: Looking for a 1305 / 1300 nm laser

Another interesting story will be in using a standard 655nm laser to catch CO2... (carbon dioxide)

IR Spectra Zoom

Not only i'm having a larger window, but i will use a standard laser, and standard instrument work well to!

2008364 - LASER COMPONENTS - LASER DIODE, 655NM | Farnell United Kingdom
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Old 10-21-2012, 01:41 PM #3
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Default Re: Looking for a 1305 / 1300 nm laser

So no one is having any advice ?
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Old 10-21-2012, 01:47 PM #4
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Default Re: Looking for a 1305 / 1300 nm laser

It seems that you've already found a company
to purchase a 1300nm Laser....

Frankfurt Laser Company - FLC (1300nm-3100nm)


I would assume that you would need to do
the testing yourself if you have not found
any useful info by doing internet searches.


Jerry

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Last edited by lasersbee; 10-21-2012 at 01:47 PM.
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