Laoyinghaina LY-DOAS-NOx (standard version) motor vehicle exhaust detection

Introduction

The automotive exhaust UV differential NOx gas measurement optical module (standard version) is specially developed for motor vehicle emission gas analysis instruments. It is based on the UV absorption method and adopts a modular design to detect NO and NO at the same time.₂. The module adopts an original design of a new multi-reflection long optical path gas chamber,which achieves high stability and fast response,and can be easily integrated into various exhaust gas analyzers.

characteristic

Directly detects NO₂ without the need for a reformer; Original design of a new multi-reflection gas chamber that takes into account long optical path and fast response; Adopts UV differential absorption spectroscopy technology,which is not affected by water vapor and pollution; Adopts pulse xenon light source,pre- The heating time is shorter and the service life is longer; the mechanical structure can be customized according to needs.

application

Ambient air analysis,stationary pollution source exhaust gas analysis,mobile pollution source exhaust gas analysis,industrial process gas analysis,laboratory gas analysis

Principles and characteristics

When the UV-visible continuous spectrum emitted by the light source passes through the sample gas con the gas to be measured,the light energy of a specific wavelength is absorbed by the target gas in the sample gas. The absorption of light (absorbance) is proportional to the concentration of the target gas. Spectral analysis and chemistry are used to The metrology method establishes an empirical curve between the differential absorbance calibrated in the laboratory and the target gas concentration,and calculates the target gas concentration in the sample gas in real time based on the differential absorbance of the measured sample gas on site.

The product adopts an original designed new multi-reflection long optical path air chamber. The incident light is refracted multiple times by the concave reflector in the air chamber and finally converges to the light outlet. Since the light beam in the air chamber is reflected by the reflectors fixed at both ends.,the air chamber wall does not participate in the reflection of the measurement beam,which can avoid signal drift,sensitivity loss and other phenomena caused by the aging of the traditional inner wall reflective air chamber,ensuring the stability of the optical path in the long-term use of the air chamber. Using multiple reflection technology,small size and long optical path can be achieved at the same time,and the optical path can be customized according to application requirements.

Technical Parameters