Stable isotopic abundance ratio real-time online monitoring device and method
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A stable isotope and isotope abundance technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as poor stability, long analysis time, and low sensitivity
Active Publication Date: 2015-03-18
ANHUI CASZT PHOTOELECTRIC MEASUREMENT & CONTROL TECH CO LTD
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[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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[0046] Such as figure 1 As shown, the overall device structure diagram of the present invention includes a laser 1, a laser controller 2, a collimator 3, an angle-adjustable prism 4, a collimator lens 5, a wavelength meter 6, an off-axis integrating cavity 7, and a temperature and pressure controller 8. Piezoelectric ceramic controller 9, off-axis parabolic mirror 10, optical detector 11, lock-in amplifier 12, signal generator 13, data acquisition A / D14, signal processing system 15. in:
[0047] The laser 1 is a tunable semiconductor laser for outputting laser light, and has characteristics such as tunable and narrow line width.
[0048] The laser controller 2 is used to control the output power and wavelength of the laser 1, the power is changed by injecting current, and the wavelength is changed in a small range at the same time, and the wavelength is locked by precise temperature control.
[0049] The collimator 3 is composed of two lenses, which are respectively used for...
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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...
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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
Inventor 夏滑庞涛张志荣吴边王高旋董凤忠
Owner ANHUI CASZT PHOTOELECTRIC MEASUREMENT & CONTROL TECH CO LTD
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