| 摘要 |
<p>Gas analyzer comprising a measuring chamber (3), a gas inlet channel (1), a gas outlet channel (14), a pump (13) for providing a gas flow through the measuring chamber (3), a device for irradiating the gas in the measuring chamber (3) with pulsating electromagnetic energy in form of infrared light so as to generate acoustic pressure fluctuations therein, and at least one microphone (9) communicating with the measuring chamber for detecting said pressure fluctuations. The inlet channel (1) and the outlet channel (14) each comprises an acoustic filter (2,11) in form of channel sections with reduced sectional area of flow (R1-R9) and a plurality of cavities (C1-C7) associated therewith. The gas analyzer comprises at least one sandwich device formed of joined plate-like elements, the channel sections with reduced flow area (R1-R9) of the inlet channel (1) and/or the outlet channel (14) being defined by at least two elements and the vibration-reducing cavities (C1-C7) also being defined by at least two elements, the connections between the respective channel and the respective cavities being provided as transverse apertures in the elements or element portions adjoining the channel and the cavities, respectively.</p> |
