GATED OPTICAL SENSORS Pavlo Molchanov1 , Vincent M. Contarino2, Olha Asmolova1

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GATED OPTICAL SENSORSPavlo Molchanov1 ,
Vincent M. Contarino2, Olha Asmolova1

• 1AMPAC Inc., USA, mpavlo2003_at_yahoo.com 2Naval
  Air Systems Command Research and Engineering
  Group, Patuxent River, MD, USA, 20670-1161

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LASER IMAGING SYSTEM
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GATED OPTICAL SENSORS

• Gated Photodetectors,
• or One point optical sensors

Gated Cameras or Imaging optical sensors
Hamamatsu (8 mm. diameter active area)
photomultiplier tube R7400U series
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Gating photomultiplier tube with large
resistance photocathode and three controlled
dynodes (M10)
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Photosensitive Module M8 H7400U with large
resistance semitransparent bialkali photocathode
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Schematic of gated power supply with two gated
transistors, H5900U, H7600U, (LS2.1)
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Experimental setup for investigation gated
photodetector in pulse regime
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Setting time 40 nsec for 99
Gating rise time 10 nsec
Input Signal
M8, H7400U
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Attenuation in Closed State 30 dB of Optical power
M8, H7400U
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Dynamic Range Of Optical Power 50 DB
50 dB
M8
M7
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Underwater Target Detection
-protection from ocean surface reflected laser
beam -protection from sunburst
reflections -decreasing of noise background.
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SeaTROLL mounted on the bow of R/V New Horizon
during field test Fully assembled SeaTROLL
system mounted on rails and extended out over bow
of ship
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Application of Gated IR camera in Fire LIDAR
Gated IR camera
Regular Camera
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GATED OPTICAL SENSORS
Gating Pulse width Area of observation (resolution) Application
1-10 Nano second 0.3 3 meter Underwater measurements, Target detection
1 Pico second 0.3 millimeter Human body screening
1 Femto second 0.3 micrometer Biomedical microscopy, tomography