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Monochrome CCD video camera and IR LEDs

Discussion in 'Lighting' started by SimonLW, Jan 8, 2007.

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  1. SimonLW

    SimonLW Guest

    Looking for a sensitive monochrome CCD video camera for night time wildlife
    observation and infrared use. What peak wavelength for IR LED sould be
    selected?
    Thanks
     
  2. David Lee

    David Lee Guest

    SimonLW wrote...
    A Sony camcorder with NightShot capability will work very well. I've seen
    one in use monitoring bat emergence from a tree roost with superb results.

    Neither the built-in IR illuminator nor the Sony "high-brightness" accessory
    IR light is supposed to be very good for use at any distance. However Bat
    Conservation and Management Inc claim to supply a very much better LED
    illuminator: www.batmanagement.com/Ordering/irlight/irlight.html. Peak
    wavelength is specified as 810nm. Battery life: 9hrs using a 12V 5Ah
    battery. Beam angle 20 degrees. Range about 60 ft (to resolve bats)
    dependent upon the model of camcorder and zoom setting of the lens.

    Another option is to use an IR filter on a high intensity halogen spotlamp -
    since most naturalists working at night will probably need to use such a
    lamp anyway. For example see the Cluson CB2 and accessories:
    www.cluson.co.uk/productsMain.aspx?CI_ID=5 &
    www.cluson.co.uk/productsMain.aspx?CI_ID=34

    David
     
  3. SimonLW

    SimonLW Guest

    I was thinking of a monochrome camera with the CS lens mount. I would expect
    a bit more sensitivity since the CCD lacks the color filter array and would
    have larger sensing elements for lower noise. The B&W cameras usually do
    better with resolution too. Of course, color is of no use here.

    The filter over halogen is a good idea. I'll have to experiment with
    underdriving the lamps since visible light is not necessary here.
    Thanks
     
  4. David Lee

    David Lee Guest

    SimonLW wrote...
    See if you can borrow a "NightShot" enabled camcorder before you go down the
    mono CCD route - I think that you will be surprised how good it is. It also
    has the advantage of built-in recording and you can immediately switch to
    normal colour mode using a halogen lamp if you want to get some colour
    sequences. It's particularly good for bat work because you can use the same
    camera for recording the area around the roost before dark and then record
    the bats using NightShot.

    Sony NightShot cameras are now being used for scientific work - some
    examples taken at random from a quick search are:
    http://bces.cnu.edu/documents/Eastetal.pdf,
    http://bces.cnu.edu/documents/Warrenetal.pdf &
    http://www.ias.ac.in/currsci/may102003/1253.pdf

    David
     
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