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Proceedings Paper

A Fiber Optic Detection System For Determination Of An Infrared Beam Spectrum In An Adverse Environment
Author(s): W. D. Turley; C. E. Iverson; S. S. Lutz; R. L. Flurer; J. R. Schaub; S. W. Allison; J. S. Ladish; S. E. Caldwell
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Paper Abstract

An optical system has been developed which measures both fluence and spectral content of an infrared (IR) beam. The system integrates a luminescent sensor with a commercial spectrometer using a novel sensor and fiber-array system. Dysprosium-doped yttrium vanadate (YV04:Dy) is the IR-sensitive sensor. Heating, from a pulse of IR radiation, increases the sensor efficiency of excitation in selected spectral regions. This effect is exploited to produce a sensor whose luminescence, instead of quenching with absorption of IR radiation, becomes brighter. Beam fluence at each spectral line is calculated from the measured change in the sensor luminescent output and a previously established calibration. The useful range of sensitivity is approximately 0.08 J/cm2 to 2.0 J/cm2. A tiny sapphire rod positioned at each spectral channel in the spectrometer couples ultraviolet NW activation energy from an input fiber to the backside of the sensor. The same rod couples the sensor emis-sion into, an output fiber. The IR beam strikes the front of the sensor. The multi-channel fiber-array output is recorded with a streak camera and the experimental data are easily translated into spectral information from the known fiber position in the spectrometer focal plane. Sensor data have been collected for fiber lengths up to 500 meters between the spectrometer and streak camera.

Paper Details

Date Published: 13 February 1990
PDF: 11 pages
Proc. SPIE 1172, Chemical, Biochemical, and Environmental Fiber Sensors, (13 February 1990); doi: 10.1117/12.963170
Show Author Affiliations
W. D. Turley, EG&G Energy Measurements, Inc. (United States)
C. E. Iverson, EG&G Energy Measurements, Inc. (United States)
S. S. Lutz, EG&G Energy Measurements, Inc. (United States)
R. L. Flurer, EG&G Energy Measurements, Inc. (United States)
J. R. Schaub, EG&G Energy Measurements, Inc. (United States)
S. W. Allison, Oak Ridge National Laboratory (United States)
J. S. Ladish, Los Alamos National Laboratory (United States)
S. E. Caldwell, Los Alamos National Laboratory (United States)

Published in SPIE Proceedings Vol. 1172:
Chemical, Biochemical, and Environmental Fiber Sensors
Robert A. Lieberman; Marek T. Wlodarczyk, Editor(s)

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