Presentation on theme: "Daylight visibility of Laser Beam Eastbourne, October 2005 Daylight Visibility of a kHz - but µJ – Laser Beam."— Presentation transcript:
Daylight visibility of Laser Beam Eastbourne, October 2005 Daylight Visibility of a kHz - but µJ – Laser Beam
Hardware Setup Eastbourne, October 2005 C-SPAD ISIT-TV SensiCAM Frame Grabber Dichroic Mirror 95% of 532 nm Filter 0.3 nm Video Night only Day/Night Day/Night; 5 % of 532 nm Old CCD (10 Hz & kHz; bigger FOV) 50 cm Main Telescope
SensiCAM - CCD Eastbourne, October 2005 Problem: Backscatter of Single Shot TOO WEAK (400 µJ) NOT Visible with CCD... Solution: Integrate Backscatter of 1000 Shots... But do NOT Integrate the noise between shots ! => Increases Signal / Noise Ratio ! Laser Pulses 1000 Exposures 50 µs Exposure per Shot; Backscatter image only 1000 Shots integrated; needs 0.5 s / image @ 2 kHz
Sensicam 360KF; from PCO Imaging (www.pco.de)www.pco.de Camera type: Interface type: PCI-Board 525 KP (Koax Version) Programming: via the C++ Package included with the CCD; Allows now for: Continuous imaging of backscatter (no mirrors switched); Uses only about 5% of the backscatter (leakage of dichroic mirror, which separates 532 from other wavelenghts); Also used for rough visual adjustment of beam divergence... Future Plans: Automatic Detection of Laser Beam Peak Automatic Beam Centering with Remote Controlled Mirror (manually adjusted now) CCD used in Graz Eastbourne, October 2005
Your consent to our cookies if you continue to use this website.