Abstract
Scanning the absorption spectral line of water vapor through wavelength around 1368.597nm 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 1atm to 5 atm.
Highlights
As is known to all, water, the earth’s most widely distributed and reserved substance that exists in three forms as gas, liquid and solid, has been closely related to human activities
The other is chemical analysis method consisting of gas escape tube evolution method, acid or alkali generation method, Karl Fischer method [9], etc
The rest 10% intensity is transmitted through fiber to a similar detector to provide an intensity reference. Both signals from two detectors are collected by data acquisition card (DAC) which is connected to a computer to do further processing
Summary
As is known to all, water, the earth’s most widely distributed and reserved substance that exists in three forms as gas, liquid and solid, has been closely related to human activities. It contains metallurgy, petroleum, chemical [3], electronics, electric power, textile, medicine, foodstuff, timber, papermaking, architecture, air conditioning, and even the nuclear and aerospace industries In this century, water measurement technology has been developed rapidly by creating various types of hygrometer and humidity sensor for measuring water in the three forms. The other is chemical analysis method consisting of gas escape tube evolution method, acid or alkali generation method, Karl Fischer method [9], etc These methods have some shortages and limitations in practical application: on the one hand, tasting results always vary from water vapor measuring. Difference method [10] and second harmonic method [11] are the current research focus on detecting water vapor concentration using spectrometry. This scheme has quicker response, higher sensitivity and better accuracy than previous ones
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