其他摘要 | As the ubiquity of water vapor in the many fields such as meteorology,
combustion science, power systems, the real-time monitoring of water vapor
concentration and the high precision detection are important. Real-time monitoring of
water vapor, cannot only predict rainfall, improve energy efficiency, also protect the
safety of power system.
Therefore, combining the existing water vapor concentration measurements and
the requirements of the production and living, the paper puts forward using tunable
diode laser absorption spectroscopy to achieve the detection of high precision water
vapor concentration.
Through the preliminary understanding of molecular spectroscopy, and the
bill-lambert which is a basic theoretical foundation, we combine wavelength
modulation and harmonic detection technology to improve the accuracy of detection.
Finally, paper gives out the scheme of realization of TDLAS H2O gas monitoring
system.
On the basis of study, the in-depth analysis of the water vapor absorption
spectrum, and combining the TDLAS technology, we chose the suitable laser, detector,
phase-locked amplifier and other` devices, and designed the gas chamber, light pathand the system circuit design, programmed for the host controller DSP to control the
whole system. In the end, combining with the advantages and disadvantages of
various algorithms and system demand for data processing, paper used a compound
data processing algorithm under a new detection method to achieve the realization of
the signal acquisition and processing and made the system have higher precision and
accuracy.
Finally, through the experiment of the system and measure of the parts, we
compared the measurement results with the reference concentration, satisfactory
experimental results were achieved. This system basically achieved the real-time
monitoring of the concentration of water vapor. And we put forward the further
perfect aspects and lay the foundation for subsequent performance improvements. |
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