Submission Title

Length Determination using Interferometry

Session Number

PS2

Location

Graves Gym

Abstract Number

PS2-w

Abstract

Determining the distance light must travel through a gas (the path length) is often difficult to determine, especially in multipass gas cells which have multiple reflections and curved mirror surfaces that are used to increase the path length in these devices. The goal of this research is to explore an alternate method to determine the optical path length of a multipass gas cell utilizing interferometry and the known index of refraction of a gas. Path length determination is accomplished by analyzing interference fringe patterns that result from changing the pressure in a gas cell that is on one arm of an interferometer. This results in interference fringes that are counted and related to the change in pressure, obtaining the path length of the cell. This method yields lower uncertainties in the measurement of the path length compared to physical measurement, leading to greater certainty in gaseous chemical concentrations.

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COinS
 
Apr 23rd, 1:30 PM Apr 23rd, 3:00 PM

Length Determination using Interferometry

Graves Gym

Determining the distance light must travel through a gas (the path length) is often difficult to determine, especially in multipass gas cells which have multiple reflections and curved mirror surfaces that are used to increase the path length in these devices. The goal of this research is to explore an alternate method to determine the optical path length of a multipass gas cell utilizing interferometry and the known index of refraction of a gas. Path length determination is accomplished by analyzing interference fringe patterns that result from changing the pressure in a gas cell that is on one arm of an interferometer. This results in interference fringes that are counted and related to the change in pressure, obtaining the path length of the cell. This method yields lower uncertainties in the measurement of the path length compared to physical measurement, leading to greater certainty in gaseous chemical concentrations.