2009 29 Oct

Advances In Infra Red Detection

Over the last decade rapid advances have been occurring in the field of infrared photography, which allow photographers and videographers to take photos and films with greater resolution. When trying to measure these advances, one must first look at the improved resolution of modern thermal imagery detectors.

Only 5-10 years ago, many of the most accurate thermal detectors on the market could at beast measure temperature differentials in the range of .1 degree centigrade. Average detectors that were not cryogenically cooled, and that were measuring infrared rays in the 8-15 micron band could offer a resolution of only 2 degrees centigrade.

Now, there are sensors on the market that can detect and measure surface temperature differentials in the range of .05 degrees centigrade, a 100% increase in sensitivity.

In addition to the advances in data gathering, much progress is being made in the ability to analyze the data collected from thermal scans. The improved analysis techniques can be categorized as one of two types of improvement. On the one hand, modern equipment is more effective in correcting for conditions which distort the results of the scans. Data can be inputted into cameras to counteract for effects of humidity, temperature and distance from the object. On the other hand, new types of algorithms are being developed, which allow and will allow operators to get more information from the data collected.

One interesting example of the use of a new interpretation algorithm is called the two source model for analysis of water flow underneath the surface and at the surface atmosphere and plant atmosphere junction. Fluxes of water from soil to air and from plant to air can be measured from aerial thermal imagery, and the data can be and fit into a hydrolic flow model, and scientists can then learn about water at and below the surface. With traditional data analysis, scientists could determine the water content of soil up to 5cm from the surface. With the two source algorithm, it is possible to discern a more extensive vertical arrangement of water in the sub surface soil.

Technological advances also have lead to the creation of thermal sensing devices with broader applications, and more sensitivity. Previously’ cameras that were capable of measuring IR rays of wavelength 3-5 microns, had to be cryogenically cooled in order to work properly. Now, newer models of non-cryogenically cooled cameras can measure some of the same IR wavelengths as the larger cameras.

Thanks to Winmax Video of California for sponsoring this report. Winmax is a California Video company specializing in the production of business videos including corporate videoand Restaurant video

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