Journal
PHOTONIC SENSORS
Volume 2, Issue 1, Pages 71-76Publisher
SPRINGEROPEN
DOI: 10.1007/s13320-011-0038-z
Keywords
Water-vapor detection; scanning spectra; detecting under high gas pressure; near-infrared absorption
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Funding
- Natural Science Foundation of China [60977058]
- Science Fund for Distinguished Young Scholars of Shandong Province of China [JQ200819]
- Research Award Fund for Outstanding Middle- aged and Young Scientist of Shandong Province of China [2007BS08003]
- Independent Innovation Foundation of Shandong University [IIFSDU2010JC002]
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Scanning the absorption spectral line of water vapor through wavelength around 1368.597 nm is successfully used to measure the value of micro-moisture content. The synchronous superposition average of original signal algorithm based on labview is innovated and applied to detecting weak spectrum absorption signal instead of low pass filter. Two data processing methods are used to get the concentration of water vapor in ppm: one is a general formula method which has newly deduced a general formula to calculate the concentration of gas with temperature and beam intensity ratio when the pressure is equal to or greater than 1 atm; the other is engineering calibration method which is proved to have high resolution and accuracy with the fitted curve of beam intensity ratio and concentration in ppm when the temperature changes form 258 K to 305 K and the pressure ranges from 1 atm to 5 atm.
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