1. GATED OPTICAL SENSORS Pavlo Molchanov 1, Vincent M. Contarino 2, Olha Asmolova 1 1 AMPAC Inc., USA, mpavlo2003@yahoo.com; 2 Naval Air Systems Command Research and Engineering Group, Patuxent River, MD, USA, 20670-1161; mpavlo2003@yahoo.com

2. LASER IMAGING SYSTEM

3. 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

4. Gating photomultiplier tube with large resistance photocathode and three controlled dynodes (M10)

5. Photosensitive Module M8 H7400U with large resistance semitransparent bialkali photocathode

6. Schematic of gated power supply with two gated transistors, H5900U, H7600U, (LS2.1)

7. Experimental setup for investigation gated photodetector in pulse regime

8. Gating rise time 10 nsec Setting time 40 nsec for 99% M8, H7400U Input Signal 10nsec Gate Closed Gate Open Input Signal 40nsec Gate Closed Gate Open Output Signal

9. Attenuation in Closed State 30 dB of Optical power Gate Closed Gate Open 2mV Input signal Output signal ND=3 ND=6 2mV Gate Closed Gate Open Input signal Output signal M8, H7400U

10. 50 dB Dynamic Range Of Optical Power 50 DB M7 M8

11. Underwater Target Detection -protection from ocean surface reflected laser beam; -protection from sunburst reflections; -decreasing of noise background.

12. 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]

13. Application of Gated IR camera in Fire LIDAR Regular Camera Gated IR camera

14. 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 Pico second0.3millimeter Human body screening 1 Femto second 0.3micrometer Biomedical microscopy, tomography