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  1. #1
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    Default Ir reflection work around?

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    Just a question.

    Having IR night vision cams, I wanted to mount them inside the house (in case they get half-hinched as they've mounted low down). Just wandered how you get around the IR reflection behind glass? The cameras have the IR beam from beside the lens,so it bounces back when near a reflective surface


    Is there a way, or do they have to be external ? I know you can mount a separate light source outside to illuminate the area, buy that would mean a whole load of new kit

    All replies appreciated

    Fwog

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    IR light is a light wave so theres no way of stopping the flair from double glazed windows. You could try completely obscuring/deactivating the IR generating LED/s and seeing if the ambient light will suffice, if the cameras are good quality and you have good street lighting outside this may work other than that....No, not really!
    Last edited by TSCM.UK.COM; 18-06-2010 at 09:52.

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    Glass, whether single or double glazed, will block most of the IR, and will reflect a shitload back into the camera / room. (If the glass is the fancy coated, thermally efficient stuff, you're completely buggered!) If you can, mount a cheap IR illuminator, and the camera outside, fairly high up, out of harms way. Not the most elegant of solutions, but the best you're gonna get.

    Similarly, mounting a PIR sensor inside the window, looking out over your garden ain't gonna work either !

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    thanks for the replies, it is as i thought

    Quote Originally Posted by Visioneer View Post
    Glass, whether single or double glazed, will block most of the IR, and will reflect a shitload back into the camera / room.
    yes found that out

    What would be a cost effective way of night vision behind glass. As IR is relatively cheap, would the 'next best thing' be a massive jump in cost?

    Cheers

    Fwog

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    Quote Originally Posted by fwog View Post
    thanks for the replies, it is as i thought



    yes found that out

    What would be a cost effective way of night vision behind glass. As IR is relatively cheap, would the 'next best thing' be a massive jump in cost?

    Cheers

    Fwog
    A PIR Flood light outside to illuminate the area if someone walks in

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    Exterior IR Flood is way to go, with a cheapish Day/Night Camera. You can get Low Light cameras, Watec 902 series etc. might be worth looking at. Probably a couple of hundred with a varifocal, AI lens.

    Should work ok on it's own, even better with exterior IR Flood.

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    Quote Originally Posted by fwog View Post
    Just a question.

    Having IR night vision cams, I wanted to mount them inside the house (in case they get half-hinched as they've mounted low down). Just wandered how you get around the IR reflection behind glass? The cameras have the IR beam from beside the lens,so it bounces back when near a reflective surface


    Is there a way, or do they have to be external ? I know you can mount a separate light source outside to illuminate the area, buy that would mean a whole load of new kit


    The way to go is getting the illumination outside so that there is no light to bounce back from inside the window. If you then use a low light camera such as this Pro 700TVL Day/Night Vandal Dome - CCTV - VLD Pro 580/700TVL Vandal Dome - Securonic you will find the camera will take up most of the slack by amplifying any residual light present on the outside image.
    All replies appreciated

    Fwog


    Posted via Mobile Device

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    The Nite Devil range are excellent low light cameras (without IR) and if you get the lens close enough to the window and have the lights switched off inside that particular room you should still get some decent quality footage of outside.

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    Quote Originally Posted by fwog View Post
    Just a question.

    Having IR night vision cams, I wanted to mount them inside the house (in case they get half-hinched as they've mounted low down). Just wandered how you get around the IR reflection behind glass? The cameras have the IR beam from beside the lens,so it bounces back when near a reflective surface


    Is there a way, or do they have to be external ? I know you can mount a separate light source outside to illuminate the area, buy that would mean a whole load of new kit

    All replies appreciated

    Fwog
    Hi fwog. getting ir light to show though dg/windows never works you might be better disconnecting the ir lights and see how the picture is at night. if you still need lighting have a look at this cctv and flood all in one. i will pm you the details.

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    Have you used any of those Tom? We tested a model about 6 months back (with the on board SD card recording) and were not too impressed, IR floodlight was very weak.

    If you've used one and been pleased then might have another look at the product.

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