Abstract
A tunable multi-mode diode laser system based on correlation spectroscopy and wavelength modulation spectroscopy (TMDL–COSPEC–WMS) is designed and demonstrated for the concentration measurements of oxygen using A-band absorption lines of oxygen around 760nm. The O2 concentrations are conversed from the relation between the normalized WMS-2f signal peak heights of the measurement and reference signals which selected based on high signal to noise ratio and correlation coefficient. The correlation and the fitted slope between the measured and actual O2 concentration are 0.9987 and of 1.025±0.012 respectively over the tested range, which indicate the high linearity and accuracy of the system. A sensitivity of 350ppmm is approved using 30 successive measurements with each measurement time taking ∼20s during 30min. A continuous measurement for oxygen in ambient air during approximately 200min confirms the stability and the capability of the system.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
