[Laser] Video Camera/Nightscope, etc. sensitive to IR light?

[Charles Pooley]

IR for cameras:   Unless meant as security cam working with IR leds (usually 940 
nm), there will be an IR blocking filter in front of a BW, and some color 
chips.  This is because the silicon is so sensitive to IR, and somewhat 
transparent to it so blurring results.  The filter is separate in all cameras 
I've seen so easy to remove.  Refocus to compensate for longer light path due to 
all-air between lens and CCD.

IR leds with over 20 mw are common as they6 are used in remote controls so 
often.  The carrier lifetime of the 940 nm is longer than that for shorter 
wavelength, so modualtion may be difficult beyond several hundred kHz.

Charles Pooley  KD6HKU




________________________________
From: Les Rayburn <les at highnoonfilm.com>
To: Free Space LASER Communications <laser at mailman.qth.net>
Sent: Fri, December 31, 2010 7:47:35 PM
Subject: [Laser] Video Camera/Nightscope, etc. sensitive to IR light?

We’re planning to run some tests using an OSRAM IR Dragon high powered infrared 
LED, and would like to use a video camera to help us sight in on the 
transmitter. Initially, we’ll probably modulate the IR with simple on-off Morse 
Code keying, and will use the video camera to verify LOS to and from various 
locations. Our goal is to determine the most likely sites for a successful VUCC 
attempt into five grids. 


I have a couple of Sony HD camcorders that feature their “Night Shot” technology 
and are sensitive to IR light, but I’m wondering if a Nightscope or other such 
device would be more useful for this application? I’ve even heard of IR rifle 
sights---anyone have any experience with this? 


Thanks in advance. 

73,

Les Rayburn, N1LF
EM63nf

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