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Article of the Month:
Temperatures: Measure Thrice At Least...Before Reporting Once
A measurement of any kind has error. Carpenters know this well and they often measure twice before cutting once. Common tape measures have resolutions down to 1/16th of an inch, but errors of as much as 1/2" are not uncommon. The best measurement is a statistical assessment of the result of repeated measurements. Measurements always have accompanying uncertainties that can be quantified and reported by measuring more than once.
This paper explains terminology and important statistics to help understand the basics of measurements, with an emphasis on infrared temperature, and the several key influences Nature and Man have on the process of dealing with them. If you have read the first modern standard on non-contact temperature sensor (radiation thermometer) measurement, ASTM E1256-15, you learned that even in a calibration lab it recommends the average of at least three measurements of blackbody source temperature in verifying an infrared thermometer's calibration. Thus, measure thrice, report once is a more reliable approach to getting the best practical result.
With the height of Summer, many thermographers focus their attention on the discomfort associated with heat and humidity. Those who spend time outdoors should also be aware of the health hazards associated with unprotected exposure to the Sun.
Thermal image shows a large warm area on a low slope roof that is being imaged from the rooftop. The yellow and pink rectangular shapes are caused by moisture within the highly absorbent insulation located beneath the roof membrane. Image taken during evening hours under calm weather conditions. Taken by John Gutierrez, this thermal image was the 1st Place winner - Roof Category in the annual Image Contest held during the IR/INFO 2017 Conference.