High-speed, continuous monitoring of liquid sprays by multi-wavelength absorption spectroscopy
Abstract
A fiber-optic array was created by arranging four Corning lensed fibers in a parallel, horizontal plane. It has been shown that through the use of multiwavelength spectroscopy, this fiber array is capable of probing a spray in four discrete locations. Two wavelengths of laser-sourced light were selected based on the optical properties of water, the fluid under investigation. Water was used as the working fluid only to evaluate the measurement techniques described here; the intent is to apply the techniques, once developed, to fuel sprays. One wavelength that is absorbed by water (1450nm) and one that is not (1310nm) were used for the spectroscopic analysis. A super-continuum (1300nm-2000nm) and diode lasers were independently used as the source of light for this experiment. In the case of ii the super-continuum source, the absorbing and non-absorbing wavelengths were selected using fiber Bragg gratings or a custom filter based on a profile gauge. By generating two pulses of different wavelengths and temporally separating them by various delay fibers, it was possible to make each wavelength distinct when received by a photodiode (detector). The dual-wavelength signal was split four ways to service each branch of the lensed-fiber array. Additional delay fibers were placed after the splitter and before the lensed fibers with the purpose of making each branch?s signal distinct. By keeping each delay described to the minimum detectable amount of time, it was possible to ?freeze?…
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