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

[J. Forster]

The stuff from WW II (1P25; 6032) easily saw 850 nM.

-John

==============

> The units I had borrowed were only cheap monocular type so may not be
> representative of better equipment. I do see information indicating newer
> generation night vision equipment having good response into the 930 nm
> range.
> - Kerry -
> --- On Sat, 1/1/11, J. Forster <jfor at quik.com> wrote:
>
>
> From: J. Forster <jfor at quik.com>
> Subject: Re: [Laser] Video Camera/Nightscope, etc. sensitive to IR light?
> To: "Free Space LASER Communications" <laser at mailman.qth.net>
> Date: Saturday, January 1, 2011, 10:52 AM
>
>
> That's surprising. Might the units you've played with have IR blocking
> filters so fires and bright IR sources don't overload it?
>
> -John
>
> ===============
>
>
>> My experience with night vision gear has shown little sensitivity to
>> IR. It  maybe just the ones I have had access to though. - Kerry N6IZW
>> -
>>
>> --- On Sat, 1/1/11, Les Rayburn <les at highnoonfilm.com> wrote:
>>
>>
>> From: Les Rayburn <les at highnoonfilm.com>
>> Subject: Re: [Laser] Video Camera/Nightscope, etc. sensitive to IR
>> light?
>> To: "John Randall" <m0els at yahoo.co.uk>, "Free Space LASER
>> Communications"
>> <laser at mailman.qth.net>
>> Date: Saturday, January 1, 2011, 2:12 AM
>>
>>
>> Thanks to John and others who responded. I should have been more
>> specific
>> with my question. What I’m interested in is a high performance system
>> that can be used to verify line-of-sight paths out to about 70 miles. My
>> idea is to use a high powered IR LED in the 3-5 watt range, using simple
>> on-off switching to send Morse Code signals. My “receiver” would be
>> a
>> night vision camera, goggles, or similar device. What I’m unsure of
>> are
>> the answers to the following questions:
>>
>> 1.) What kind of sensitivity would be required to detect the IR
>> “beacon” at that kind of range? Generation 1, 2, 3? In other words,
>> what is the effective range of this simple system as determined by the
>> sensitivity of the photomultipler?
>>
>> 2.) Attempting VUCC using lasers or high powered LED’s requires a
>> minimum of five grids. Four grids is easy for even a basic system, since
>> the range can be a mile or less by positioning one station on a grid
>> intersection. The 5th grid is tougher...distance is about 70 miles
>> minimum. We’re trying to determine a potential “good” site in the
>> Southeastern United States without having to deploy the “full
>> system”
>> and are hoping to use this simple system just to verify the path.
>>
>> Maybe there’s a better way?
>>
>> 3.) I already own a Sony Nightvision HD camcorder that has Generation 1
>> capability. Would this be suitable?
>>
>> Any suggestions or advice are most appreciated.
>>
>> 73,
>>
>> Les Rayburn, N1LF
>>
>>
>>
>> Les Rayburn, Director
>> High Noon Film
>> 130 1st Avenue West
>> Alabaster, AL 35007-8536
>> (205) 621-7500
>> (205) 621-7505 FAX
>> (205) 253-4867 CELL
>> http://www.highnoonfilm.com
>>
>> From: John Randall
>> Sent: Saturday, January 01, 2011 3:34 AM
>> To: Les Rayburn ; Free Space LASER Communications
>> Subject: Re: [Laser] Video Camera/Nightscope, etc. sensitive to IR
>> light?
>>
>> All cameras can see IR. Just shine your tv remote into the camera lens
>> and
>> you will see white led's. The trick is to get rid of a small glass
>> filter
>> which is normally placed infront of the cd imager sensor. Once its
>> removed, your images and video however will become a bit washed out in
>> colour.
>>
>> This will get you closer to IR.
>>
>> John
>>
>>
>>
>> --------------------------------------------------------------------------------
>> From: Les Rayburn <les at highnoonfilm.com>
>> To: Free Space LASER Communications <laser at mailman.qth.net>
>> Sent: Sat, 1 January, 2011 3:47:35
>> 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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