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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-want-build-laser-thread-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!
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-want-build-laser-thread-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!