Vehicle tail gas multi-polluting component real-time remote measuring method and device

Abstract

The invention discloses a vehicle tail gas multi-polluting component real-time remote measuring method and device, and belongs to the field of environmental sciences and optical spectroscopy. Vehicle tail gas accounts for 80% of urban pollution resources, and a usual monitoring method is a two-speed idle discharge method or a simple condition method, so that real-time site multi-component monitoring cannot be achieved. According to the device, an infrared tuning diode laser spectrum and an ultraviolet difference absorption spectrum are jointly used, and difference absorption, narrow pulse width scanning and second harmonic detection of an infrared tuning diode laser are used. An ultraviolet difference absorption method adopts spectrum technology of a holographic grating light splitting spectrometer and an array detector, various pollutants such as CO, CO2, HO, HC and smoke dust are detected in real time in a multispectral mode, and the device has high sensitivity at a PPM (parts per million) level, high resolution and dynamic effect detection capacity.

Description

Technical field [0001] The invention belongs to the field of environmental science and spectroscopy, and specifically relates to a method and device for real-time remote sensing of multiple pollutant components of vehicle exhaust. Background technique [0002] A large amount of harmful exhaust gas emitted by vehicles burning gasoline or diesel is the main mobile pollution source that pollutes the environment. Studies have shown that pollution caused by vehicle exhaust accounts for 80% of the entire city's air pollution. The usual monitoring method of automobile exhaust is to analyze it with conventional instruments after sampling, which cannot fully reflect the true emission of automobile exhaust pollutants. There are two main methods: [0003] 1. Dual-idling emission method: refers to the method of pollutant emission measurement at two idling speeds. One of the two idling speeds is ordinary idling speed, which is the idling speed specified in the vehicle manual; the other is High ...

AI Technical Summary

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 cars are always moving, and the emissions of car exhaust pollutants are closely related to the operating conditions of cars, it is very difficult to monitor the pollutants in car exhaust on-line in real time

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