Method and device for preventing water from entering optical cavity ring-down closed-loop flux analyzer

Abstract

The invention discloses a method and device for preventing water from entering an optical cavity ring-down closed-circuit flux analyzer, and relates to the field of optical cavity ring-down closed-circuit flux analysis, the device comprises a cabinet body and a support frame, the support frame is located at one side of the cabinet body, and a high-vacuum air pump and an auxiliary pump are respectively installed at the lower part of the interior of the cabinet body; and an extension socket is arranged at the top of the high-vacuum air pump and the auxiliary pump. A gas concentration analyzer isarranged at the top of the extension socket. According to the device, a double-pump air inlet structure is adopted, high-speed sample injection is achieved, high-frequency attenuation caused by long-air-path sampling is reduced, detection interference can be prevented through the specially-made rainproof and anti-mosquito air inlets, millisecond-level response can be achieved through automatically-controlled air path purging. In ocean application, gas path water inflow caused by sea wave slapping can be prevented, the sample gas drying efficiency of the device is larger than 90%, high-frequency water vapor pulsation inhibition is larger than 95%, crosstalk of water vapor to other trace gas absorption spectra is effectively reduced, gas path delay can be accurately measured through multiple times of high-pressure zero gas pulses at regular time, and therefore the precision of detection results is improved.

Description

technical field [0001] The invention relates to the technical field of optical cavity ring-down closed-circuit flux analysis, in particular to a method and a device for preventing water from entering an optical cavity ring-down closed-circuit flux analyzer. Background technique [0002] Ocean CO 2 、CH 4 The eddy correlation measurement technique of iso-greenhouse gas fluxes is an effective means for the development and verification of sea-air exchange models and the study of ocean carbon cycle. Results from more than a decade of published papers illustrate the main disturbances of water vapor and motion, revealing experimental methods to improve the precision and accuracy of measurements. Water vapor cross-sensitivity is the largest source of error in measuring CO2 fluxes using infrared gas analyzers (IRGAs), often causing a ten-fold bias in measured CO2 fluxes. As previously assumed, most of the errors were not related to optical contamination. Although various correcti...

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Problems solved by technology

[0004] The object of the present invention is to provide a method and its device for preventing water from entering an optical cavity ring-down closed-circuit flux analyzer, so as to solve the problem of accurately measuring and calculating signal lag time and frequency decay time and the analyzer pumping water into the above-mentioned background technology. Problems That Cause Damage to Gas Analyzers

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