Air testing platform adopting Herroitt multiple-reflection specimen chamber

Abstract

The invention relates to an air concentration testing device, and in particular relates to an air testing platform adopting a Herroitt multiple-reflection specimen chamber. The air testing platform comprises a specimen chamber housing, an infrared light emitter, a light receiver and a conjugated infrared light reflective device. An air inlet and an air outlet are configured on the specimen chamber housing, and an entry direction shifting device and an exit direction shifting device are configured in the cavity of the specimen chamber housing. The conjugated infrared light reflective device comprises two conjugated concave infrared light reflectors fixed on the two ends of specimen chamber housing respectively. The light from the infrared light emitter enters into the cavity of the specimen chamber housing; after being reflected by the entry direction shifting device, the light is reflected many times between the two conjugated concave infrared light reflectors; and the light reflectedmany times is reflected by the exit direction shifting direction device to the light receiver eventually. The actual optical distance (about 1m) achieved in the invention is over six times as long asthe entire length of the body of a multiple-reflection reflecting pool, thus a lower limit of NO testing implemented by the air testing platform with a multiple-reflection reflecting pool can be lessthan 25 ppm.

Description

Technical field [0001] The invention relates to a gas concentration detection device. Background technique [0002] The non-dispersive infrared gas detector NDIR (non-dispersive infrared analyzer) has the characteristics of simple structure, no moving parts, long service life, reliable performance, and small influence of environmental factors such as temperature and pressure. It can be used in many occasions such as automobile exhaust detection. , CEMS continuous flue gas detection and other fields are stable and reliable real-time measurement becomes possible. [0003] The existing NDIR detection platform usually includes an electrically modulated infrared light source, a gold-plated tube sample cell, a pyroelectric sensor with a narrow band filter, and signal processing. The gold-plated tube is used as the sample cell, but the NOx measurement must reach a detection level of less than 25ppm Accuracy requirements require an optical path longer than 70cm. If a single gold-plated tu...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the optical path and volume of the existing NDIR nitrogen and oxygen detection platform are contradictory, the present invention provides a gas detection platform using a Herroitt multiple reflection sample chamber. The detection platform is a long optical path, small volume, optical path Low loss gas detection platform

Images