![]() If you heat a pot to 800 degrees or so it will start to emit near infra-red, but this thing cant see anything that is not in near infra red, and a pot will reach near infra red at about 800 degrees or so I think. The image intensifer is practically blind to it. The Flir is sensitive to even tiny changes in temps. This is a small label printer that is on my dresser. On the right of the image, one can see that there is a heat source nearby. The color shading that indicated temp differential is provided by the Flir. All of the wood grain and door knob detail was provided by the camera. The only way the thermal camera shows an image is though heat differential. The software takes the thermal image and it overlays it on an image generated by the camera in the phone. Now it is imporant to say that the Flir is a hybrid system. As we can see, the thermal camera shows the door as a uniformly cool surface. By comparison NV is totally blind to small temp differentials. The thermal camera can see these small changes in temp, but that is what it is designed to do. Notice that the door is a uniform temp which is probably close to ambient (about 74 degrees). Of course my hand temp is only about 96 degrees but the thermal camera show the residual heat from my hand when it was against the door. ![]() I pressed my hand to the door for about 10 seconds to make a thermal print then took the picture. This is a picture I just took with my thermal camera. It is amazing to see that to the NV device, the whole door is softly glowing. ![]() No long exposure or anything.Īnyway, for your amusement, I put the pictures side by side to show exactly how much light leaks though a door that most would think is more or less light proof. The exposure is 1/10th second and ISO is 250, so this is not some long exposure and captures the view almost exactly as bright as seen by the eye. Note that the cardboard honeycomb is glaringly obvious and some horizontal material is also seen, but I can't figure out what it is. In the right picture, things don't look as sharp (and in the eyepiece, the detail approaches the left image) but one has to remember that in the right image, the Luan outer veneer is diffusing the incoming light and scattering it, and the camera side veneer is likewise diffusing the image some as well, which gives the appearance that the view is soft, but to the eyepiece, it is much more detailed than the camera can see it but still not as detailed as the left image because again, a lot of contrast is being lost because of the bad light leakage. Now the picture on the left looks a lot more detailed but it has to be remembered that in this picture, you are only seeing the light that is being reflected from the door face. The only source of light here was the leakage through the door skin. The picture on the right is made with one of my tubes and no room light. The picture on the left of course is taken with just the phone and the ceiling light on. To the adapted eye, with the door closed, the room is quite dark. So, today, a day with a total moderate cloud cover, I thought I would show what I mean. Even during the day, there is high ambient light in the room, but even on cloudy days, there was more than enough light to cause the test room to never be anything close to dark much less getting close to the EBI threshold of even my lowest performance tubes. Now my super secret test room is adjacent to another room in the house and this room has skylights. It was only by using the image intensifer to look for some unknown light source that I discovered that the doors themselves were glowing like giant green flat panels. Now there is light leakage at the frame gaps and base of the doors but a long time ago, I tried to seal the gaps and the light leak under the door, but I was still suprised that even with the gaps sealed it was never really dark in the room. The Luan veneer is not exactly thin at all, being considerably thicker than most furniture veneer, but it is not like 1/4" plywood either.Īnyway, I had mentioned that during the day, the light kind of comes right though the doors so I though I would show a picture of what I mean. Luan doors are made by building a frame with some reinforcing internal framing, and in many cases, a cardboard honeycomb is used in the voids to give the Luan veneer some strength so that you can't easily damage it. There are two Luan doors into the super secret test room. In a post from a couple of days ago, I mentioned how I had trouble getting my super secret test room dark during the day due to light leakage through the doors. ![]()
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