Motor vehicle exhaust gas detection light beam reflection device and detection system

Abstract

The invention relates to a motor vehicle exhaust gas detection light beam reflection device and detection system. The motor vehicle exhaust gas detection light beam reflection device includes an upperreflecting mirror group and a lower reflecting mirror group; light axes of reflecting mirrors, on adjacent reflection lines, of the upper reflecting mirror group are perpendicularly arranged, and light axes of reflecting mirrors, on adjacent reflection line, of the lower reflecting mirror group are perpendicularly arranged, and a light beam is reflected by the upper reflecting mirror group and the lower reflecting mirror group and has a folded-line moving direction with an inclined angle of a right angle. The motor vehicle exhaust gas detection system includes a Fourier transform infrared spectrometer and the light beam reflection device. The Fourier transform infrared spectrometer reflects the light beam via the light beam reflecting device and then detects the motor vehicle exhaust gas.The detection of the motor vehicle exhaust gas is more accurate and more economical, and the application scope is wider, so the application of the detection system and method can be promoted.

Description

technical field [0001] The invention relates to the technical field of exhaust remote measurement systems, in particular to a motor vehicle exhaust detection light beam reflection device and detection system. Background technique [0002] With the continuous increase of the number of motor vehicles, the impact of motor vehicle exhaust emissions on the environment is increasing, and with the promulgation of the six-year inspection policy for motor vehicles, and the falsification of exhaust emission data by individual motor vehicle manufacturers , making it very necessary to carry out road tests on motor vehicle exhaust under actual operating conditions. Through the on-line measurement of motor vehicle exhaust, the actual emission of motor vehicle exhaust can be accurately obtained, and data support and legal basis can be provided for policy decisions such as motor vehicle restriction. At the same time, roadside detection of motor vehicle exhaust pollution can provide law enfo...

AI Technical Summary

Problems solved by technology

[0006] But the prior art has the following disadvantages: although the V-shaped reflective structure is very ingenious, its effective measurement section is still relatively narrow. When the exhaust tube is outside the V-shaped reflective angle, it is difficult to obtain accurate data

At the same time, if the height of the gantry is high, the angle of the V-shaped reflection will be small, resulting in a decrease in effective measurement

This also limits the use of the scheme on roads with large vehicles

[0007] Although NDIR, NDUV and other methods are low in cost, the components that can be measured are limited. The measurement of each component is measured in time sequence, not at the same time. In the process of calculating the actual concentration of exhaust gas, it is necessary to It is approximately considered that these components are measured at the same time, so the more components, the greater the error caused

In addition, these technologies cannot solve the influence of interfering components, and cannot determine the exact components. As long as there are interfering components, correct results cannot be obtained

Moreover, the instrument itself is measured by light intensity, so the result is easily affected by external conditions and the accuracy is low.

[0008] Laser analysis itself has high precision, but due to the monochromaticity of laser, one laser can only measure one substance, so when there are many components, multiple lasers are needed for measurement, and generally used Advanced mid-infrared lasers (such as quantum cascade lasers, etc.) are very expensive, generally only between 150,000 and 200,000, which leads to high cost of multi-component measurement, making it difficult to promote the entire measurement system and method

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