2 ms·
I wonder how the mirrors are cleaned or kept clean. Maybe that isn’t an issue when detecting concentrations that would take a mile of light to measure, and exis
by rz2k 2y ago
I wonder how the mirrors are cleaned or kept clean. Maybe that isn’t an issue when detecting concentrations that would take a mile of light to measure, and existing NDIR detectors are sufficient for things like detecting different gasses in pollution.
It would be nice if there were general purpose gas measurement sensors that could identify more gasses rather than being specialized to a specific gas. Could this be done by replacing the circuitry of a typical evaluation board with an interface to something like an NVidia Jetson Orin Nano?
- condensedcrab 2y agoUsually cavity mirrors would be somewhat sealed to prevent dust/junk build up. Problem with general purpose spectroscopic measurements is that you need a broadband source and detector. This adds complexity compared to a targeted wavelength range.
- jmusall 2y agoYou usually mount mirrors vertically so dust does not settle on them that much (also it is safer to keep laser light propagating horizontally at only one height). Additionally, overhead ventilation is often installed which provides a vertical Laminar flow of dust-free air. If you have to clean the mirrors eventually, you'd use compressed (clean) air or special mirror cleaning wipes. Thorlabs (lab supply company) has a detailed guide on optics cleaning[1] [1] https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=9025 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=90...