Online monitoring system of greenhouse gas and stable isotope thereof

Abstract

The invention relates to an online monitoring system of a greenhouse gas and a stable isotope of the greenhouse gas. The online monitoring system comprises a measurement module and a data acquisition and control module. The online monitoring system is characterized by further comprising an automatic sample feeding module and a power device, wherein an outlet of the automatic sample feeding module is connected with an inlet of the measurement module, the power device is connected with an outlet of the measurement module to provide power to the sampling, and the output end of the data acquisition and control module is connected with the automatic sample feeding module, the measurement module and the power device and the data acquisition and control module controls all the modules to cooperatively and synchronously work. The online monitoring system has the beneficial effects that the automatic sample feeding module and the power device continuously suck air to an optical attenuation cavity for performing automatic and continuous measurement, a tunable laser generates light with a plurality of specific wavelengths, multiple components can be measured; the wavelength resolution can reach 0.0001 cm<-1>, the anti-interference capacity is strong; and by adopting an optical cavity attenuation detection technology, a gas concentration is in direct proportion to an attenuation time, the influence by light source fluctuation and a light intensity attenuation factor is small, the stability is good, and the measurement value is accurate.

Description

technical field [0001] The invention relates to the technical field of gas detection and automatic control, in particular to an online monitoring system for greenhouse gases and their stable isotopes. Background technique [0002] Greenhouse gases refer to the gaseous components in the atmosphere that can produce the greenhouse effect. The six major greenhouse gases that are restricted by the Kyoto Protocol are CO 2 、CH 4 , N 2 O, HFCs, PFCs, and SF 6 , its temporal and spatial distribution and its variation play a decisive role in the radiation budget and energy balance of the earth-atmosphere system. Greenhouse gas monitoring is the basis for studying the trend of greenhouse gas concentration changes and the composition, nature and intensity of sources and sinks. [0003] Stable isotopes are isotopes that are highly stable and do not decay. 2 H. 13 C. 17 O. 18 O etc. are common stable isotopes in ecosystems. The content of stable isotopes in different emission so...

AI Technical Summary

Problems solved by technology

[0004] Existing greenhouse gas monitoring technologies mainly include Fourier transform infrared spectroscopy, non-dispersive infrared absorption spectroscopy and tunable semiconductor laser absorption spectroscopy, etc. It cannot meet the needs of trace greenhouse gas monitoring in the atmosphere; at the same time, the current isotope monitoring technology mainly uses stable isotope ratio mass spectrometers for laboratories, which are bulky and complex in operation procedures, and cannot meet the needs of automatic online monitoring. Perform various operations such as water removal and organic matter removal, otherwise it will cause large deviations in measurement results

Images