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Scott Wood

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About Scott Wood

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    Building Science Thermographer
  1. The Testo merge function (super resolution) can provide some awesome images. It is always better to have higher resolution, especially if you cannot fit the scheduling into the proper environmental conditions. Can't upload the image from the Test T890 at super resolution (1280 x 960) due to its size 4.9mb, but believe you me, its one sharp image, making interpretation quite easy.
  2. And you could also use a spot radiometer as well... I will have to agree, an IR imager in my back pocket would be useful if I didn't have my imager available. Though I'm trained to use it and interrupt the images I provide. I cannot see someone who is unwilling to get a decent imager because its too expensive, paying for the needed training to correctly interpret the images for reporting. If you feel all home inspectors will now use a FLIRone, we are in trouble if this becomes the standard of the industry. Please, lets also understand its possible use in showing "issues" onsite to
  3. Nice discussion on thermal imagers. A couple of points and some nit-picky details you should all be aware of if using a thermal imager in your investigations. The two most important considerations for thermal imagers are resolution and thermal sensitivity. In both cases the better, the easier the image will be to resolve the thermal patterns. But, in the cases of great temperature differences (think evaporating water, insulation anomalies when temperature difference is high) a cheap, low end, usually will provide a thermal pattern you can see. Nice looking image for your client, NOT! And y
  4. Yes, glass is a smooth spectral surface, providing sharp reflections in infrared, even though only about 14% reflective. Ghost hunters often use this in "discovering" ghosts with a thermal imager. If you look carefully you can see yourself waving back on some very smooth painted surfaces and always on glass surfaces. Brushed stainless is incredibly reflective in infrared, sometimes surprising the unsuspecting.
  5. Solid materials have differing degree of transparency at different wavelengths. The thermal imager's lens is made of a metal! Borosilicate glass is 90% transmissive between 0.5-2.5 micrometers(um) (visible is 0.49-0.75um), dropping off to 5% at wavelengths around 3.5 um, becoming opaque at wavelengths greater than 5.0 um. The cooled detectors of the midrange thermal imagers (3-5um) can see through glass to some degree. However, most are familiar with a room temperature detector, which are longwave detectors (8-14um). None of these imagers can "see" through glass as described above. You men
  6. As pointed out, the FLIR One has many applications. Unfortunately, the low resolution makes visualizing the thermal patterning pretty poor. They "enhance" the image using the MXS process that overlays visual outlines over the thermal image. In addition I hear that multiple thermal images are merged, also helping fill in the thermal's initial low resolution. Both create a computer generated image that looks much better then the initial low resolution image. An interesting false image the MXS produces is the perception that you can see through glass. The visual overlay provides an image that l
  7. John, This is a sad day for infrared thermography's use in building applications. I suppose in a capitalistic environment this maybe a big coup for Nick's pocketbook. It is hard to understand how thermography's use in buildings for ...energy inspections or energy audits, indoor air quality inspections or termite inspections... was not prior art since publications as early as 1974 show it was shown to be developed by taxpayer funds at CRREL: 1. CRREL, Hanover, NH, October 1974, R.H. Munis, R.H. Berger, S.J. Marshall, M.A. Bush, Detecting Structural Heat Losses With Mobile Infrared Thermograph
  8. I only posted an abbreviated list and may have left off some great references for pre 2005 building thermography citations. If you have specific citations (or complete publications) please feel free to forward and I'll include them in the growing list. Currently I'm at about 56 citations that discuss the utilization of thermography in building applications and have not looked at all publications yet.
  9. Below are the first 20 citations I've located, starting in 1974 that discuss the use of thermography in building applications. I have an additional 37 references stopping at 2004 citations. Contact me and I'll be happy to provide additional citations or add those I've missed. 1. CRREL, Hanover, NH, October 1974, R.H. Munis, R.H. Berger, S.J. Marshall, M.A. Bush, Detecting Structural Heat Losses With Mobile Infrared Thermography. Part I Description of technique. 2. CRREL, Hanover, NH, September 1975, R.H. Munis, R.H. Berger, S.J. Marshall, M.A. Bush, ?Detecting Structural Heat Losses With Mob
  10. Additional information and posts of HomeSafe's patents on the use of thermography has spread to other forums including, LinkedIn's RESNET BPI Energy Audit and Home Performance. It seems that once a patent is issued, little can be done to prevent it's enforcement without incurring huge legal expenditures. This may be the reasoning for the lack of visible fight from FLIR when the letters first went out in 2008. Seems time is ripe for home inspection organizations and imager manufactures to team up on this issue.
  11. Nick, Thank you for your post and involvement regarding the legal action. Could you be more specific on the reasoning behind HomeSafe's lawyers dropping legal action?
  12. NPR can provide great information, like this one, excellent. Thanks for the link David.
  13. To better understand "..not fancy enough" they should have describe the gas finder better. David above has mentioned the detector wavelength as a requirement for gas detection. The longwave imagers (E60BX) are not able to detect the wavelengths that gases absorb at, nor are they sensitive enough for detection of low levels of gases. These $30K plus imagers, unlike the room temperature detectors common for building applications, are cooled detectors and specially filtered. This allows the user to "see" the specific wavelengths required for gas observations. FLIR does have a radiometric versio
  14. Regarding up to date, you are correct that some homeowners "upgrade" the envelope and the data is historical. The intent is to show those who are not aware of the energy losses of their building(s) the areas of most concern and a possible loss (or gain when fixed) that the "leak" provides.
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