A kind of gas absorption cell for absorbing spectrometry

Abstract

The invention discloses a gas absorption tank used in absorption spectrum determination. The gas absorption tank comprises a tank body (1), two plane reflecting mirrors, and a gas chamber. The gas chamber is positioned between the two plane reflecting mirrors. A transmission path of multiple reflected beams is adopted as a main axis. A plane cover (4) is covered on the tank body (1). A plurality of optical windows are provided on the inner wall of the gas chamber of the gas absorption tank. The optical windows are formed by light reflection surfaces of the two plane reflecting mirrors, wherein the light reflection surfaces are exposed in a gas sample. The gas chamber of the gas absorption tank comprises a sample inflow port and a sample outflow port. Light beams are subject to one or moretimes of transmission in the area between the two plane reflecting mirrors. The gas sample flows along the transmission path of the multiple reflected beams.

Description

technical field [0001] The invention relates to a gas absorption cell for measuring gas components by absorption spectrum. Background technique [0002] At present, in many fields of application, it is necessary to use absorption spectroscopy to detect trace gases at the concentration level of ppm and ppb. In order to improve the detection sensitivity of absorption spectroscopy for low-concentration gases, increasing the length of the light beam passing through the gas sample is an effective method. Obviously, simply placing the light source and the detector far away, so that the light beam passes through a very straight and long transmission type gas sample cell, will make the device bulky, complicated in alignment, poor in temperature stability and shock resistance. "Folding" of the optical path is often used, ie the beam is reflected multiple times between mirrors to achieve effective optical path lengthening in a small spatial area. For example, White-type gas absorptio...

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Problems solved by technology

This not only easily causes gas turbulence and circulation, but also has a great impact on the concentration of gas in the chamber. At the same time, it takes a long time to complete the update of gas samples in the gas chamber, which is not conducive to the real-time and rapid detection of continuously changing gas samples.

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