Welcome to IRINFO.ORG

IRINFO.ORG is a content-based web resource and on-line community dedicated to professionally promoting infrared thermography and related PPM, PdM and NDT technologies. Through our Articles and Tips, we offer timely, accurate information that is updated several times each week. Our Directories of IR Manufacturers and Infrared Thermographers list resources unmatched anywhere in the world. IRINFO.ORG is owned by professional infrared thermographers with decades of real world experience in all facets of IR thermography and infrared temperature measurement. Bookmark our site and visit often.

Article of the Month:

Temperatures: Measure Thrice At Least...Before Reporting Once

G. Raymond Peacock

Temperatures.com, Inc.
Southampton, PA 18966

Ph: 215-436-9730


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.

Continue reading this article / Read this article in PDF Format