Adaptive Front Lens for Raman Spectroscopy Free Space Optics
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United States of America Patent
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Issued Date -
May 1, 2014
app pub date -
Oct 28, 2013
filing date -
Oct 30, 2012
priority date (Note) -
Abandoned
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Abstract
A Raman spectroscopy system features free space optics, wherein an excitation laser beam is directed to a sample, and Raman scattered photons are collected from a desired point of the excitation beam's impact on the sample, through the air, without the use of fiber optics. The excitation laser is directed to a sample, such as fluid flowing in a pipe, through a sight glass in the pipe. A front lens assembly, having a fixed focal point at a predetermined z-axis distance in front of the front-most lens, collects Raman scattered photons, which pass through an optical system to a detector. The Collection Point (CP), or the point along the excitation beam (and within the sample) at which Raman scattered photons are collected—which coincides with the focal point of the front lens assembly—is controlled by physically translating the front lens assembly along the optical axis.
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