The effect of gamma ray radiation on the performance of a compact Er-doped super-fluorescent fiber source was
investigated experimentally. It was found that the output power and spectrum of the source vary significantly with
radiation dosage and probably the induced background loss for the pump would play a significant role in the observed
variations. A double-pass backward source configuration with an output edge filter was implemented experimentally, and
with proper feedback control pump driving circuitry, such a configuration demonstrated good resistance to gamma ray
radiation.
Two type of output spectrum profile, flat and gauss profile were realized with gain flatten filter and edge filter
respectively. For high performance fiber optic gyroscope application, a vary parameters control technology was taken
and the less than 0.5 ppm/ °C mean wavelength stability and less than 1% output power stability were achieved within
operation temperature -45 °C - +70 °C .To developing radiation-resistance broadband source, the erbium-doped fiber
radiation characteristic was studied experimentally and the super-fluorescent fiber source configuration parameters and
pump laser diode power were optimized. The radiation-resistance super-fluorescent fiber source module was made.
Experimental test shows that two type of SFS, include gauss and flat profile spectrum, can stand against more than
50Krad(Si) radiation dose.
KEYWORDS: Sensors, Infrared sensors, Thermography, Staring arrays, Near field optics, Electro optical modeling, Infrared radiation, Infrared imaging, Cryogenics, Signal to noise ratio
The sensitivity of a sensor system and its optical aperture size are two key parameters commonly used to characterize the
performance of a remote sensing or space-borne surveillance system. In this work, a sensitivity model for space-borne
staring IR sensor systems which are mainly used for point-source detection and identification is developed. Different
noise components, including the photon noise from background radiation and near-field thermal radiation of optics, the
electronic noise of sensors, as well as the nonuniformity noise of an infrared focal plane array (FPA), are considered.
Based on the published parameters of the Multispectral Thermal Imager (MTI) electro-optic sensor system, the
feasibility and validity of the model are demonstrated, with emphasis on the prediction of the cryogenic temperature
impact on the sensor sensitivity and the optical aperture size requirement in a space-borne multispectral infrared (IR)
system.
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