Technology and application of infrared gas sensor

[BlueTrin]

Please can you send me samples of your sensors to analyse He/O2 composition in a mix?

 

[The Chairman]

CO (at high sensitivity even with low precision/accuracy) would be nice addition too!

Yeah, that too. All four simultaneously would be beyond awesome.

 

[broncobowsher]

I think I have seen these in other places and they list operating pressure. Ambient only.
So total waste of time.

 

[dberry]

CO is easy to detect with IR. CO2 also. N2, H2, O2 and He do not absorb in the IR and will show zero signal. Nada.

I'm happy to explain the science, if anyone wants to geek out.

IR detection for CO is used every time you get a state emissions inspection for your vehicle. It's cheap and easy. But there's a reason why O2 sensors are electrochemical devices.

BTW, there's a nice wikipedia article about NDIR gas sensing. You will note the long list of gases do NOT include O2, N2, H2, or He.

Nothing to see here (for divers), move along...

Nondispersive infrared sensor - Wikipedia

en.wikipedia.org

 

[nadwidny]

CO is easy to detect with IR. CO2 also. N2, H2, O2 and He do not absorb in the IR and will show zero signal. Nada.

I'm happy to explain the science, if anyone wants to geek out.

IR detection for CO is used every time you get a state emissions inspection for your vehicle. It's cheap and easy. But there's a reason why O2 sensors are electrochemical devices.

BTW, there's a nice wikipedia article about NDIR gas sensing. You will note the long list of gases do NOT include O2, N2, H2, or He.

Nothing to see here (for divers), move along...

Nondispersive infrared sensor - Wikipedia

en.wikipedia.org

I worked at a lab that used FTIR (Fourier-transform infrared spectroscopy - Wikipedia) analyzers for air samples so I understand the science. But for the rest of the group, the link you posted is a pretty good reference.