On-line concentration monitoring of MCVD reagents by acoustic time-of-flight (ATOF) method

Gardy Cadet; J. L. Valdes; Katherine T. Nelson

doi:10.1117/12.143540

30 April 1993 On-line concentration monitoring of MCVD reagents by acoustic time-of-flight (ATOF) method

Gardy Cadet, J. L. Valdes, Katherine T. Nelson

Proceedings Volume 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV; (1993) https://doi.org/10.1117/12.143540
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

The reaction of oxygen with silicon tetrachloride (SiCl₄) and other glass-forming chemicals is the basis for the preparation of optical fiber preforms by the modified chemical vapor deposition (MCVD) process. Control of the concentration of the gas phase reactants is important for fabricating a preform core with the desired composition and refractive index profile. An acoustic time-of-flight (ATOF) method has been used to determine the concentration and evaluate the stability of the precursor delivery system used in the MCVD process. The measurement technique is based on accurate determination of the speed of sound which is dependent on the concentration of the binary mixture. Highly precise measurements for SiCl₄ and GeCl₄ have been obtained for a variety of oxygen carrier gas flow rates. The results obtained by the ATOF method agree within +/- 1% of the values obtained by direct gravimetric calibrations. The utility of ATOF for calibrating chemical reagent delivery systems is confirmed experimentally.

Citation Download Citation

Gardy Cadet, J. L. Valdes, and Katherine T. Nelson "On-line concentration monitoring of MCVD reagents by acoustic time-of-flight (ATOF) method", Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); https://doi.org/10.1117/12.143540

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