| 摘要 |
<p>The object in a non-dispersive gas sensor is to minimize the use of moving parts, as those reduce the service life of a sensor. A preferred solution is such that it includes one infrared source (1), one short sample chamber (2) and one or generally more infrared detectors (9) operating over a certain wavelength band. If the number of detectors is more than one, it is important that the light arriving in all detectors has traveled through the sample chamber (2) as identically as possible. However, in view of using preferred commercial detectors without major angular errors and delay times in signals, the light is guided from the source (1) to the detector (9) by means of a wave tube (7). <IMAGE></p> |
