Raman fiber optic probe assembly for use in hostile environments

Patent · Sat Jan 01 00:00:00 EST 2000

OSTI ID:873228

Schmucker, John E ^[1]; Falk, Jon C ^[2]; Archer, William B ^[3]; Blasi, Raymond J ^[4]

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1. Hurt, VA
2. Pittsburgh, PA
3. Bethel Park, PA
4. Harrison City, PA

This invention provides a device for Raman spectroscopic measurement of composition and concentrations in a hostile environment by the use of a first fiber optic as a means of directing high intensity monochromatic light from a laser to the hostile environment and a second fiber optic to receive the lower intensity scattered light for transmittal to a monochromator for analysis. To avoid damage to the fiber optics, they are protected from the hostile environment. A preferred embodiment of the Raman fiber optic probe is able to obtain Raman spectra of corrosive gases and solutions at temperatures up to 600.degree. F. and pressures up to 2000 psi. The incident exciting fiber optic cable makes an angle of substantially 90.degree. with the collecting fiber optic cable. This 90.degree. geometry minimizes the Rayleigh scattering signal picked up by the collecting fiber, because the intensity of Rayleigh scattering is lowest in the direction perpendicular to the beam path of the exciting light and therefore a 90.degree. scattering geometry optimizes the signal to noise ratio.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, PA (United States)
• DOE Contract Number: AC11-89PN38014
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 6115528
• OSTI ID: 873228
• Country of Publication: United States
• Language: English

Related Subjects

raman
fiber
optic
probe
assembly
hostile
environments
provides
device
spectroscopic
measurement
composition
concentrations
environment
means
directing
intensity
monochromatic
light
laser
receive
scattered
transmittal
monochromator
analysis
avoid
damage
optics
protected
preferred
embodiment
obtain
spectra
corrosive
gases
solutions
temperatures
600
degree
pressures
2000
psi
incident
exciting
cable
makes
angle
substantially
90
collecting
geometry
minimizes
rayleigh
scattering
signal
picked
lowest
direction
perpendicular
beam
path
optimizes
noise
ratio
direction perpendicular
avoid damage
probe assembly
fiber optics
scattered light
fiber optic
preferred embodiment
optic cable
beam path
hostile environment
optic probe
hostile environments
noise ratio
corrosive gases
raman spectra
monochromatic light
exciting light
spectroscopic measurement
corrosive gas
chromatic light
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