Calculating NIR Path Length for Gas Absorption Analysis

[mobilecal]

Hi everyone,

Yes I am a newbie here so forgive me if I don't ask the question correctly. I am trying to understand how to determine the minimal and maximum path length based on gas absorption.

I know this is based on Beer Lamberts Law but I am not sure which formulas to use and the order to use them. I appologize but I am not degreed in physics, but I have been a hobbist in spectroscopy and gas analysis for about 2 years.

In my thoughts I figured tat a minimal the following parameters must be considered.
1. Path Length
2. Gas (O2-760nms, 1% by volume)(range is .5% to 20%)
3. Beam Diameter
4. Pressure
5.Temperature
6. Tansmission

So if I did not ask correctly, I know the gas I am trying to measure, but not sure how to calculate what path length would be acceptable based on the sensitivity and range.

I am willing to do the work, just looking for some guidance here. Thank you in advance.

 

[mobilecal]

Could someone give me a hand here or tell me maybe I should ask this question on another Physics Forum Page? I hope I posted on the proper page. Thanks in advance.

 

[mobilecal]

Any help or direction would be appreciated. Thanks in advance.

 

[mobilecal]

sure is hard to get help on this forum. Guess its too complicated for some.