1. Grasscity.com August contest: Follow us on YouTube to be entered to win a PAX 2 Vaporizer! Winner will be announced Sept 1st
    Dismiss Notice

Guide To Learn How To Avoid The Thermal Imaging Cameras

Discussion in 'Advanced Growing Techniques' started by TheSelectah, Jul 9, 2007.

  1. How To Hide From Airborne
    Infrared Flair Detection Devices


    For All You Midnight Border
    Adventurers & Those Who Camp
    Out To Protect Your Grows Op's


    An Awesome Guide To Learn How To Avoid The
    Flair Heat Detection Thermal Imaging Cameras


    Infra Red Detection and the Sniper
    Now this was written to help the military snipers
    to be able to blend in, & Avoid the Infrared Flair
    Thermal Imaging Cameras. & It does an awesome
    job of explaining in theory how they work & their
    weak points etc. Well we can also use the same
    principles talked about here, to help those of
    us who need to avoid the detection by the
    Thermal Heat Detecting Flair Cameras.

    Knowledge Is Power



    In Hot Tips & Cold Shots. Fieldcraft. Thermal Detection, there are some pretty gloomy postings about IR detection. As an electrical utility thermographer, I might shed some light (pun intended) on the subject. To qualify this, I am using the latest (I think) commercially available FLIR product, and am a level II thermographer, (total formal IR training: 2 weeks-experience using IR equipment: about 5 years.) I believe I am at least familiar with IR. Granted, my life is not depending on avoiding IR detection, so I guess I can have my opinions pretty safely. These are my
    observations about IR imagers using civilian
    equipment and are.. "just my opinion". It's up to you and yours to check them out in your world.

    This is WAY brief, believe it or not. Anyone interested can email for more. This is about THERMAL detection, not IR illuminating sources for "starlight" scopes.

    IR is not Xray, Hollywood bedamned-it cannot detect a differential heat image through common solid materials, plastic film (black or otherwise) being an exception. However, a good imager system can see through holes in a masking material ("IR masking" camo net). And if you are inside a dumpster, body heating the bad guy's side, he can "see" the hot spot on the dumpster's outside. But if you are not leaning (heating) against that side, he can't "see you". Your body heat will not be
    detected behind most readily available unholed blinding materials if you are not differentially warming/cooling those materials or allowing your own IR to reflect off of something behind/over you. BUT, if the shielding materials are alien to the surroundings, the material itself will probably stand out. See below.

    Glass will not allow your THERMAL image to transmit (pass) through; same as the dumpster scenario. The lenses of IR imagers are made of exotic nonglass materials because of this.

    Every piece (cluster) of matter, including gasses, emits IR if it is above Absolute Zero (minus 459.69 degrees F). The warmer a body gets, the more IR it will emit. Eventually it will enter the visible spectrum as it gets "red hot".

    The surface of a piece of matter is where IR is emitted. Altering an object's surface will alter the rate at which IR is emitted. Stoveblack is a classic example.

    Materials physically different from each other will likely emit IR at different rates. BUT the differences may be very slight.

    IR imaging (read DETECTION) depends upon two objects having one or more differences in Temperature,
    Emissivity/Reflectivity, and Absorption of the compared objects. For this application, we can forget about Absorption, and you should all understand Temperature. Now, E + R = 100%, thus the more
    emissive a surface is, the less reflective. If two
    dissimilar objects are at the same temperature, a high E will "look" hotter to an IR imager than a low E, thus forming an image. Objects with different Temperatures and the right E's could "look" the same, thus forming NO image. Two objects with similar temperatures and similar emissivities will present an unclear, poorly defined image. Herein lies your IR strength.

    Here are some Emissivity values for a few materials, all in percents, all plus/minus a point or two. These are for short wavelength commercial imagers and may vary slightly for long wavelength/long range military/LE equipment. Military techies should have similar emissivity tables for your equipment.


    Human skin
    : 97
    Black vinyl electrical tape
    : 97
    Surface sprayed with Dr. Scholl's aerosol foot powder
    : 96
    Water
    : 95
    Rubber, black, hard
    : 94
    Glass, smooth
    : 94
    Plywood, raw lumber
    : 90-95
    Most painted surfaces (NON aluminum paint)
    : 90-95
    Aluminum based paints, depending on formula
    : 30-50
    Oxidized (blued, parkerized) steel
    : around 90
    Snow
    : 82-85
    "Most" organics (vegetation)
    : around 80
    Cloth, untreated
    : around 80 (Cotton
    was a plant too)
    BDU fabric, treated
    : ????????? I
    would like to know.
    Sand
    : 76
    Clay
    : 40
    Gravel
    : 38
    Aluminum, bare and "shiny" (read "spaceblanket")
    : under 10


    Note the materials that cluster around 95, 80, 40, and 10

    Now, to apply IR-101: In all of the scenarios below, remember that your body (or ANYTHING above absolute zero) emits IR in ALL directions. If there is a reflective object behind or beside you, it will pick up your IR and reflect it like you were a light bulb. Whichever situation and methods you use, if you have the opportunity, have an ally check you out from a flank with your best IR detection equipment. Or get the flyboys to check you out with FLIR's namesake. Do this by day AND night, as the sun will do weird (but predictable) things to the differential temps.

    The BEST way to protect yourself from IR detection is get behind/under what is already there, and DON'T change the temperature of it. Since you obviously have to see and perhaps reach out, do so through the smallest portal(s) you can handle. Those "man-sized" targets detectable at 1100 yards are just that - man-sized - not the size of your nose and right eye. Remember that glass reflects some IR (100 - 94 = 6%), and the sky
    (space) is cold (approaching Absolute Zero), so if
    your scope is reflecting not sun, but sky, it will look COLD. If you have on a scope sunshade that is hot, the internal IR of the sunshade will reflect out as HOT.

    I believe the GI Woodland BDU's are treated with an IR emittance reducer. If so, the "cloth" E figure in the table will change and you have to adjust for the following discussion. Or obtain untreated camo fabric or defeat that treatment (starch, I believe). The IR reducing treatment makes sense for a situation where the
    woods is cooler than 98.6 F. I hope the Desert
    Daylight BDU's are NOT treated, but the nighttime anti-starlight smocks probably should be. If your BDU's image "cold" against hot sand, you are just as "seen". I trust the techies were aware of this, and have specified correctly. But you need to confirm by looking through your equipment at your buddy against some typical
    backgrounds.

    It has been reported that "fresh" BDU's do indeed have an IR treatment that fatigues (pun) with laundering in "brightener" detergents. As a hunter, I am aware of the UV problem with animals with good night vision (is it an overabundance of rods, or cones, in the eye?) and there are detergents available via sporting goods stores that do not contain brighteners. If you need to maintain that BDU treatment, you might try that. But again, look at your buddies with your equipment.

    Now, in sand or vegetation (E = 76-80): If you HAVE to have artificial cover for situations where your clothing will approximate the temperature of the surroundings, you want to expose matching temperature "stuff" with a similar E (around 80). Cover as much of your skin (97) as possible with cloth (80) (remember that I don't know the E for treated BDU's). But also remember that sweaty cloth in a hot, dry background might look cold due to evaporative cooling. If you are in a hot dry
    situation, a tented, solid (not net), dry camo fabric applied as a screen might do the trick for IR. (Remember, same T, similar E). Visual is another problem. Keep the outlines irregular for both IR and
    visual. Square stuff in a curvy world stands out, no
    matter the technology. Fresh local vegetation in front of the screen will help both.

    Camo face paint is PROBABLY a high emitter, similar to regular paints (90-95), and sweat (water-95) is for sure. You really have to keep that face behind something. I don't know what a synthetic ski
    mask would have for an E, but I bet it is below
    97. A plain old cotton tee shirt mask would work, but remember the wet/dry/cooling problem.

    Black ANYTHING is a good emitter. Blackened steel barrels, synthetic stocks, and painted surfaces (all E's in the 90's) should be cloth wrapped for IR and visual both. Black SWAT uniforms probably have a higher E than camo. You need to test.

    Dry rubber boot soles (94) are nearly as hot as your face - sock 'em (80).

    Old cut local vegetation will be drier, thus HOTTER due to lack of evaporation.

    The name of this game is to keep both the Emissivity and the Temperature of the screen and clothing the same as that of the surroundings and keep those portals small.

    If you are on bare clay or gravel (38-40) and are worried about aerial observation, dig in. Cover yourself with almost anything sufficiently rigid and then cover it with at least a thin but full layer of the local "dirt". This will match the E's. Once the moisture of the new cover layer equals the moisture of the surface around you (evaporative cooling), you will be in decent shape IR wise. Remember that these low E materials have a high
    Reflectivity, so block your own IR from getting out from
    under the cover. If there is a chance your body heat will affect the top surface of the dirt cover, use insulating material between you and the bottom of the "roof" to keep it the same temp as the ground around you. Foam board or sleeping bags will do that. The most critical times of day for this hide would be as the sun changes, because rapid heating/cooling of a thin layer of dirt will show up compared to the slower heating/cooling of the
    intact soil masses. If you can set up in a shaded spot
    where this will not occur, you should be in decent shape. If there is no shade, make the cover layer thick to create a heat sink approaching that of the surroundings.

    If there is no threat of aerial observation, and it is only a frontal threat, a "wall" of local dirt with small portals would be the best bet.

    Any new foxhole will print either hot or cold depending on the season and surface temperature, even if the surrounding soil is bare. The deeper soil temp is probably closer to 55 F than the surface.

    On snow (82-85), build a snow fort or tunnel in and make small portals. Try to dust loose snow to duplicate surface texture. Pray for new snow. If you wore an aluminized face shield behind that snow fort, it would reflect the "cold" off of the fort, and cover your hot face. This might be a shiny side application of the space blanket, and could be worth testing. Water (95) is your breath when it condenses. And it is warmer than the snow. Only thing I can think of to do here is breath through a ski mask and let it condense before it fogs up over your screen.

    As to "space blanket" applications: there might be some, BUT. If you are using the shiny side toward you to keep your IR from getting out, remember that the backside of it is probably not a good E match to the surroundings and it will heat/cool a lot differently than most natural things around you. If you are trying to
    put the shiny side out angled down to reflect the IR of
    the terrain right in front of you, there would be a 10% reduction in the reflection, more if it casts a shadow. If the shiny side is out and up, it will reflect the cold of outer space (or the heat of the sun) - and it is going to look REALLY weird to visual and starlight in EITHER case! I cannot think of a space blanket application
    that I would stake MY life on.

    In an urban situation, you will have lots of "normal" IR blockers to get under/behind. Just remember that you are an IR light bulb on the cold surfaces behind you. You cannot casually set up back in the room shadows of a windowless building anymore. Remember, glass will NOT pass through (transmit) your IR image. BUT, glass (94) has a high emissivity and will show its surface temperature rather well. If you are near the window
    warming it with your breath, you will reveal yourself. If
    you had a small barrel portal through an otherwise intact glass window, you would be IR blocked, but visually seen. A loose pane of glass back in the room shadows might be a possibility, especially for a spotter. If the room is painted (90-95) and warm (approaching 98.6 F), you might blend in IR wise. But if there is one
    warm window/room in an "empty" building, something is amiss. The painted walls behind you might not reflect your IR really well, but a metallic light fixture might blink
    every time you turn your face toward it. The best I can imagine is forget about the "room" and get behind/under something that should be there - sofas, chairs, drapes, etc. and keep your portal small.

    None of the above CONCEALMENT strategies are easy; none are guaranteed to make you disappear to an imager. But they will all help make you a less vivid IR image, thus less detectable. IR imagers may or may not have an adjustment to key in the emissivity for scanning and reading temperatures. I doubt military/LE
    targeting devices would have that - you don't care
    what the actual temp is, you just want to see a picture. Military/LEO devices probably have a temperature range adjustment to scale up/down according to environment. They probably have an adjustment to
    set the sensitivity - the difference in perceived T to go from black to white (dark green to light green; whatever).If this is finely tuned, it is like upping the
    contrast on your monitor.

    There is one comforting thing to consider: unless you are in the desert, there are a lot of different "things" around you, each of them with a slightly different Temperature and Emittance combination. If you can make yourself "nearly" match the most common IR surroundings and the sensitivity is set very high in order to pick up your small T/E difference, the other guy is seeing a lot more clutter around you, so your image will be just one spot
    on the Dalmatian.

    For the Ghillie fans: A man sized wad of only burlap and jute rope at 98.6 F plus or minus a few degrees will have the same E all over it. But if there was some leafage from an IR blocking camo net on one shoulder and a splotch of shredded BDU's at the waist and some foreign force camo material shredded in there somewhere in a cluster, all well supplemented with local
    veggies, from an IR standpoint it would look like a pile of dissimilar "stuff".

    If you have gotten this far, perhaps a little DECEPTION is in order to up your advantage.

    Remember that "Sarge WILL find something during an inspection, so ya might as well give him something so he will stop looking." If you want to determine if indeed IR detectors are out there, you might want to give them a cowboy hat to shoot at. I don't know what the E of a bare GI plastic canteen is, but if you either wrapped it with Scotch 33 electrical tape (97) from a demo/como kit or sprayed it with foot powder (96) from your ruck, and had 98 degree water (coffee? Body heat?) in it,
    it would make a darned good human face (97) to a distant IR imager. Topped with a BDU hat and moved about on a stick behind some intentionally inadequate screening after dark (by somebody else behind that cowboy's large rock), I suspect you would soon know the targeting capabilities of the opposition - and also
    acquire a muzzle flash. A piece of most anything
    warmer than the terrain drug remotely through the grass at night should get IR attention. Just don't pull it all the way to your position. But you get the idea.

    If you want to just give him/them something to worry about, scatter some old tire shreds (94) around at points distant from your position. They will look hotter than most surroundings when they are actually the same temperature. Plus, they will heat up more during sunlight, and hold their temperature for quite a while
    into dusk. If you can make them move a bit, so
    much the better. If they are behind intentionally poor screens, thus not visually or starlight identifiable, so much the better. This would be a great application for decoys specially made for the purpose - a visually camo'd, high E lollipop on a spindly, flexible stick.

    One of the new IR illumination chemlights would do something, but I have no experience with them. I suspect one of them tripped off in front of or to the side of your position, yourself in a shadow from it, would blind any thermal imagers looking at you - like a trip flare would blind a starlight. Obviously this would be a
    defensive action.

    There have been some pretty impressive demonstrations of the capabilities of IR equipment. And it is indeed impressive stuff, but it ain't magic. It can image warm footprints on a cold roof, or a "ghost" where you leaned against a cold wall and walked away. But those images fade pretty quickly - faster than the grass will spring back up on your trail to a nest.

    I believe that if one person takes the time to study and understand the theory of IR systems and applies it to likely circumstances in his world and does it better than the other guy does, the first guy has an EXCELLENT chance of being the winner. That is true for sniping or bidding on a roof inspection. Even an unfavorable tilt in sophistication of equipment may be overcome with intelligent application of ingenuity. And it won't take a
    lot of formal training. After that, it is experience
    behind an imager. In your case, looking at your buddies in drill hides, and correcting each other's errors. I grant you that my "thermacam" is not a military targeting device, but if your life is professionally depending on IR avoidance, I hope you have access to IR theory training and support along with the opportunity to drill with your own imagers.

    A rambling closure:

    Overheard among the French crossbowmen at Crecy, 1346AD: "If we go against the Smoking Demons, we will die."

    Letter from a Confederate camp, 1864: "The Yanks have put spectacles on rifles. There isn't no way to avoid a bullet from a mile away."

    NOT to be uttered by my youngest son, USMC Security, Kings Bay NB, 2000:
    "If they've got IR, we are &^%#(+'d!"

    If you may be exposed to a "new" technology, you just have to learn it and apply it. Like you did for visual and starlight. In fact, most of those old rules apply to IR: Irregular outlines. fresh vegetation. local materials. etc. The only real new rule is "Similar E - Similar T". Now, get with some equipment and TRAIN, DRILL,
    EXAMINE, Train, Drill, Examine, train, drill, examine.....
     
  2. too much scientific talk.. didnt even take the time to read
     
  3. ^^^^^^^^^^^^^^^^^^^^^^^^^^
    [​IMG]
     

  4. Then get out of the advanced growing section and go back to the begginer's section.
     
  5. Such an amazing read! Thank you man
     
  6. Doomsday preparing? That sounded like some terminator 2 talk man! Coooool!;)
     
  7. wtf???

    I used to be a filing clerk in the warrants secttion of a major American city.

    "Thermal imaging" means looking for whole buildings (or parts of buildings) that are hotter then the bldgs that surround them.

    "Thermal imaging' = "hot building imaging", get it?

    THERE IS NO WAY TO HIDE A BUILDING THAT IS TWENTY DEGREES HOTTER THEN ALL THE BULDINGS THAT SURROUND IT - a hot building will glow like a muthafukker

    I have seen the thermal imaging photos that cops use to get search warrants.

    Dude, if the poli shine thermal imaging equip at your grow room those muthafukkers are gonna PICK UP THAT THE TEMPERATURE OF THE BUILDING THAT HOLDS YOUR GROW ROOM IS HIGHER THAN THE TEMPERATURE OF ALL THE OTHER BUILDING IN THE NEIGHBORHOOD regardless of whether or not you were a sniper and blah blah blah ...
     
  8. I thought it was illegal for them 2 do that though. TI
     
  9. interesting and informative, validated a lot of my thoughts.

    Thanks,
     

  10. I'm curious then, If its not the direct lighting they are picking up but rather just the heat dissipating into the house causing it to stand out amongst other buildings. What if your water cooling your lamps and major heat sources? If no heat is escaping into the housing materials (ex. wood, insulation, carpet...) but rather being exchanged into water. Then doesn't that mean your off radar??:ey:
     
  11. WATER COOLING HID lamps: yes, the heat that is transfered into the cooling water reservoir (instead of the building roof and walls would REDUCE the thermal image of the grow room with water cooled lights.

    By "water cooling your lamps" you mean using a water heat exchanger? In other words, it is like a fan cooled (outdoors) radiator that blows air across a coil that contains heated water right? If that is what you mean then, yes, that would very significantly reduce the infrared image of the walls and roof of the grow room. Of course, the outdoor radiator would appear as a glowing heat source, which could be anything (probably not suspicious to Big Brother and His All Seeing Thermal Imager) .... the radiator would be easy to insulate too if you wanted to.

    Plain old styrofoam (expanded poly styrene) is a fabulous (but highly flammable) thermal heat barrier.

    I like the story about the guy in Northern Calif. who had his grow room in his barn - hay was stored in the loft over his grow room. Since fresh cured hay produces small amounts of heat as it just sits (CO2 also), the whole barn was always nice and toasty warm and the grow room would have been completely camoflaged. I wold be 2 afraid of fire to do this
    '
     
  12. so how do they tell me apart from my glass blowing neighbor ? or someone who just like it at 80 degrees indoors.. your logic is bad..

    if you "see a grow" in IR you see a big "flame thrower" looking plume coming out of the side of the house.

    now I can also get into the reflectivity of roofing materiels(I roofed for 5 years), and how IR cannot see into a house..
     
  13. THEY CAN'T - that's the point. Most grow rooms that are in urban areas are probably surrounded by hundreds of bldgs of similar thermal signature.

    But what about out bluildings that (full of HID lights) ? That's when thermal imaging works best - out in the country, for example.

    Obvioulsy, a grow room inside a house that is all temperature regulated by a home ait conditioning unit would ne hard to see.

    "Thermal imaging" is more of a paranoid pothead myth and just not that big of a deal (at least not yet).

    Indoor grows are very hard - almost impossbile - for the cops to find on their own but they still bust growers all the time and the way indorr growers get busted is because of SNITCHES not winged pigs flying around with IR cameras.
     
  14. I see we are in agreement ..musta misread you. :eek:

    I live in the boonies actually, my "neighbor" is about 2 miles away, and I get daily ( if not more ) fly overs by the Coast Guard.. fun times in the smummer when My girls are outdoors... :devious:
     
  15. I have used IR scopes and FLIR cameras used on military helicopters and bombers. (I served in the Air National Guard). While I never hunted grow ops, I can tell you that the best way to hide your op would be to have a room within a room. The outer room then needs to be climate controlled to be close to the rest of the house. A tent in a room with a simple air conditioner will work fine in most cases. Just pay the power bills on time.
    Basements are great for growing. They tend to be naturally cooler and there is less wall space exposed to the outside. Thick shrubs planted around the foundation can also help to camouflage the heat signature of the exposed wall and will also help diffuse hot air if you vent direct to the outside. Use evergreens if you live in northern climates.
    You can also take into consideration the possible sight lines of the helicopters. The outside wall of your op may be blocked from view by trees or other buildings.
     
  16. [quote name='"Wharfrat74"']
    I see we are in agreement ..musta misread you. :eek:

    I live in the boonies actually, my "neighbor" is about 2 miles away, and I get daily ( if not more ) fly overs by the Coast Guard.. fun times in the smummer when My girls are outdoors... :devious:[/quote]

    wow, I would be super paranoid with all of that air traffic. Blackhawks flew over my grow last year and I freaked out to say the least. I could see the gunner looking out the sliding door as the helicopter flew in circular patterns while doing a grid-style search.
     
  17. hi, great article. thanks for the opportunity to learn even more.
     
  18. Thermal imaging has been ruled unconstitutional by the supreme court. At least for residential usage.
     

  19. how accurate is this information?

    and how worried should someone be if they are growing a small grow using CFL's?
     
Loading...

Share This Page