Method and apparatus for measuring gas concentrations

摘要: Some embodiments are directed to a photoacoustic sensor. The sensor may comprise: gas cell with an opening; light source generate radiate sample within the cell; optical microphone detect and membrane aligned opening of permit enter cell. includes semiconducting laser. laser p-n junction cavity further pressure-sensitive that receives coherent emitted from directs reflected back toward During operation microphone, flexes in response acoustic pressure waves. phase is dependent upon distance aperture