Optical path structure for real-time telemetry of multiple pollutants in motor vehicle exhaust

Abstract

The present invention is a real-time telemetry device and method for multi-polluting components of motor vehicle tail gas, which belongs to the field of environmental science and spectroscopy. Motor vehicle tail gas accounts for 80% of urban pollution sources, and the usual monitoring method is double idling discharge method or simple working condition However, real-time on-site multi-component monitoring cannot be carried out. The device adopts the combined use of infrared tuned diode laser spectrum and ultraviolet differential absorption spectrum, and uses differential absorption of infrared tuned diode laser, narrow pulse width scanning and second harmonic detection. The ultraviolet differential absorption method uses spectral technologies such as holographic grating spectrometer and array detector to realize multi-spectral real-time monitoring of CO, CO 2 , HO, HC and smoke dust detection, with PPM level high sensitivity, high resolution and dynamic effect detection.

Description

technical field [0001] The invention belongs to the fields of environmental science and spectroscopy, and in particular relates to a real-time remote measurement device and method for multi-pollution components of motor vehicle tail gas. Background technique [0002] A large amount of harmful exhaust gas emitted by motor vehicles burning gasoline or diesel oil is the main mobile pollution source that pollutes the ambient air. Studies have shown that the pollution caused by motor vehicle exhaust accounts for 80% of the entire urban air pollution. The usual monitoring method for automobile exhaust is to analyze it with conventional instruments after sampling, which cannot fully reflect the real emission of automobile exhaust pollutants. There are two main methods: [0003] 1. Double idling emission method: refers to the method of measuring pollutant emissions at two idling speeds. One of the two idling speeds is the normal idling speed, that is, the idling speed specified in t...

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Problems solved by technology

Although this method can use a computer to simulate the vehicle's driving conditions to detect the exhaust emission, it still needs to sample the exhaust emitted by the vehicle, and it still cannot provide real-time changes in the exhaust emission of the vehicle.

[0005] 3. Since the car is always moving, and the emission of vehicle exhaust pollutants is closely related to the operating conditions of the vehicle, it is very difficult to monitor the pollutants in the vehicle exhaust on-line in real time

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