The 260K seems to be targeted to fever scanning as Unix5566 mentioned, so I am hoping the price premium is mostly due to the increased sensitivity and the current demand. Most manufacturers of microbolometers clearly state the percentage of functional pixels expected to exist on a production FPA. This is generally 99.6% or 99.8% as I have already stated. Many microbolometers provide far more functional pixels as tests on the E4 and it’s dead pixel map image showed. The service mode on many cameras tells you how many pixels are marked as bad. The service modes can sometimes provide the option to carry out a fresh NUC process and create a new dead pixel map to correct pixels that have drifted badly or failed in use. Thankfully most FPA’s work their whole life with the original NUC table and dead pixel map created at the time of production. One place where the camera could do with some improvement is the visual camera supporting the thermal sensor which has a 640 x 480 pixel resolution. Most infrared thermal imaging cameras will have at least a 2 MP visual camera. Whenever low-cost manufacturers introduce a high-end thermal camera in their portfolio, I’m always intrigued. This is the moment where they bring the fight to the big manufacturers and try to bring more to the table in terms of numbers. There’s an unwritten rule: The flagship of one company will be a better offering when compared to the mid-range of another. Why? Because the other company has their own flagship as well which costs even more and thus the mid-range can’t go that far in terms of specs because it will make the flagship redundant. It’s marketing 101.

Uni-t Uti260A Infrared Thermal Imager Camera 256*192 Heat

The UNI-T UTi260B is a thermal camera which offers great value for money with a high thermal resolution, 25 FPS refresh rate, wide temperature range and IP65 rating. The camera also has quite a wide viewing angle of 56 x 42 degrees, this is also known as field of view. It is difficult for a user to establish how many non functioning pixels are present on a thermal sensor FPA for the reason that you detail. All FPA’s will contain pixels that are either faulty or produce an output that falls outside of the acceptable specification. The image data from the ROIC is normally RAW and subsequent image processing stages create the Non Uniformity Correction and Flat Field Correction tables that both capture ‘out of specification’ pixels and try to correct other pixel outputs to achieve a good Flat Field output. The dead pixel map is created by the NUC ‘calibration’ process carried out at the factory. Any pixel that produces an unacceptable pixel output value is marked as ‘Dead’. Regarding the quality of microbolometers used...... whilst it is true that science grade microbolometers are of the highest quality with the minimum of dead pixels, most general use microbolometers are still of very good quality with 99.6% or 99.8% pixels within specification. Many microbolometers are far better than that specification. I am not sure that microbolometer makers actually release FPA’s with high dead pixel counts. The acceptance testing criteria for a thermal imaging FPA is pretty specific and tight. This is good news for buyers of the technology.

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All the thermal images that you capture will be stored on the 16GB microSD card which is provided with the camera. That is more than enough and you basically won’t have to delete any photos throughout the camera’s lifetime. The image quality is really very good, the resolution of 256x192 gives a much better image than the Flir one gen2 (160x120) that I also have. What might be surprising was that a 320x240 (76k pixels) gives a perfectly acceptable image with over 1000 dead as long as they are scattered. This does indeed work, with any good edge. How easily does depend on the replacement system being used. A Raytheon BST does a simple 'copy next' so produces horizontal lines, some tend to copy down/right, some will do an average of the good neighbours.

Uni-t UTi260B - Page 1 - EEVblog Uni-t UTi260B - Page 1 - EEVblog

Once the Dead Pixel map has been produced the image processing stages of the camera do their best to disguise those pixels from the users view. This is relatively easy in most cases as the values of surrounding pixels may be used to create an average value to replace that of the dead pixel position in the array. Life becomes a little more challenging when a cluster of dead pixels or a dead column is detected. A cluster can cause a dead spot in the image displayed that cannot be concealed by the image processing and a dead column can be a challenge to hide from the human brain that sees pixel correlation and recreates the defective line in some cases. For these reasons a thermal FPA sensor specification normally states that the FPA shall not contain more than a certain number of pixels in a cluster and adjacent to each other. Dead Columns may also be a reason to reject an FPA. Reliable Quality, IP65 Rating]-- Made of high quality material and is ergonomically designed, with wear resistant and durable shell, anti-slip handle, comfortable operating buttons and tripod mounting hole in the bottom. And with IP65 protection grade and 2m drop resistant, it's more convenient to use for various applications. Version K is aimed towards measuing fever in people (Limited range around 30ºC but increased accuracy ±0.5ºC). Now that China is producing its own microbolometers, we may see a change in the production acceptance criteria for cheaper cameras, but that is not something I know about.Third, the start time of over 20 seconds. And when changing between high and low gain (>150°C) you can wait another 20 seconds...