Stable isotopic abundance ratio real-time online monitoring device and method

Abstract

The invention discloses a stable isotopic abundance ratio real-time online monitoring device and a stable isotopic abundance ratio real-time online monitoring method. A wavelength scanning off-axis integrated cavity spectrum technology is utilized for performing precision measurement on isotopic abundance ratio of an object element, and the device comprises a laser device, a laser controller, a signal generator, an angle adjustable prism, a wavemeter, an off-axis integrated cavity, a temperature and pressure controller, a piezoelectric ceramic controller, an off-axis parabolic mirror, a photoelectric detector, a lock-in amplifier and a signal processing system for acquiring A / D (analog / digital) and terminal signals. The method disclosed by the invention is performed on the basis of the off-axis integrated cavity laser absorption spectrum technology and is further combined with wavelength scanning, cavity regulation, temperature, pressure and wavelength precision control technology, so that the stable isotopic abundance ratio real-time online monitoring can be realized, and trace gas concentration and isotopic abundance ratio measurement can be simultaneously performed; furthermore, the preparation of a sample is not required, so that the measurement frequency is greatly improved; and the device has the advantages of simplicity in operation, no need of calibration, almost no drift during a long period of time, good stability, low power, convenience in carrying, mounting and field experiments and large dynamic range.

Description

technical field [0001] The invention relates to the field of optical analysis devices for stable isotope abundance, in particular to a real-time online monitoring device and method for stable isotope abundance. Background technique [0002] In recent years, the application of stable isotope analysis in the field of environmental science and environmental protection has been paid more and more attention, especially in the study of atmosphere, soil, water quality and ecological environment. Such as the use of stable isotope abundance changes to study and indicate environmental pollution sources and pollution levels; use the method of measuring lead isotope ratios to determine gasoline manufacturers and their pollution levels to the atmosphere; use isotope dilution methods to determine harmful pollutants in various water resources The content of trace elements is used to monitor water quality; the tracer effect of stable isotopes can be used to identify the source of greenhouse...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a real-time on-line monitoring device and method for stable isotope abundance, so as to solve the problems of the existing stable isotope abundance monitoring device and method, such as too long analysis time, low sensitivity, poor stability, etc.

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