William Coblentz Created 2026-10-24 Updated 2026-11-05
William Coblentz developed quantitative infrared spectroscopy and radiometry. Measuring the radiation from heated sources required sensitive detectors and a calibration that could be compared across instruments. His work on black-body radiation connected measured spectral distributions and total radiation with temperature. These measurements tested radiation constants and helped establish absolute optical measurement at the National Bureau of Standards, showing why detector design and calibration belong alongside the radiation law being tested.[ref]
Figure 1.
Portrait of William Coblentz
. Harris & Ewing; source United States Library of Congress. Public domain in the United States (PD-USGov, as tagged on Commons). Source usage terms, via Wikimedia Commons. Source.