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Joined 2026-09-21 Message
Incoming links: Radiation
Tristan Guillot 2026-11-05
Tristan Guillot developed analytic radiative-equilibrium models for irradiated planetary atmospheres. They connect incoming stellar radiation and outgoing thermal radiation with a temperature-pressure structure, making assumptions about opacity and irradiation explicit.[ref]
On the radiative equilibrium of irradiated planetary atmospheres by Tristan Guillot. author list and the described study’s abstract or introductory account
Walther Friedrich Created 2026-10-18 Updated 2026-11-05
Walther Friedrich coauthored the experimental observation of X-ray diffraction by a crystal with Paul Knipping and Max von Laue. A beam transmitted through the sample produced separated spots on a photographic plate. Their geometry connected the periodic structure of the crystal with constructive interference of the scattered radiation. The apparatus turned a proposed wave test into an observable pattern, providing a method for investigating matter on atomic length scales.[ref]
Interferenz-Erscheinungen bei Röntgenstrahlen by Walther Friedrich, Paul Knipping and Max von Laue. 1912 report, experimental arrangement and diffraction photographs
A physicist.[ref]
https://www.bbaw.de/die-akademie/akademie-historische-aspekte/mitglieder-historisch/historisches-mitglied-walter-friedrich-804. Independent biographical identity and professional specialization
Portrait of Walther Friedrich
. Source. 
William Henry Bragg Created 2026-10-18 Updated 2026-11-05
William Henry Bragg developed experimental methods that turned crystal diffraction into X-ray spectroscopy. A crystal selects reflected radiation at particular angles, while a movable detector measures the reflected intensity. Relating these peaks to lattice-plane spacing connects an instrument reading with the wavelength of the incident radiation. His joint work with Lawrence Bragg established a quantitative relation between crystal geometry and X-ray reflection, helping make diffraction a practical probe of both radiation and structure.[ref]
The Reflection of X-rays by Crystals by William Henry Bragg and William Lawrence Bragg. Proceedings of the Royal Society A 88, 428–438 (1913), reflection measurements and crystal geometry
Portrait of William Henry Bragg
. Nobel Foundation; portrait dated 1915, published in Sweden in Les Prix Nobel 1915 (1916), page 101; individual photographer unspecified. Commons PD-Sweden-photo: Swedish public-domain status under its simple-photograph or anonymous-photograph provisions., via Wikimedia Commons. Source.
Yoshihiro Ohno Created 2026-10-13 Updated 2026-11-05
Yoshihiro Ohno develops the physical interpretation of optical measurements used in vision. His account distinguishes radiometry, which measures optical radiation, from photometry, which weights visible radiation by the eye's spectral response. Equal optical powers at different wavelengths therefore need not have equal luminous output. A photometer can implement that weighting through its spectral sensitivity, or a spectrally resolved measurement can be weighted afterward. This connects a reported brightness-related quantity with its detector and wavelength conventions.[ref]
Radiometry and Photometry: Review for Vision Optics. 2000 chapter, abstract: radiometric/photometric quantities and spectral weighting
Portrait of Yoshihiro Ohno
. Yoshihiro (Yoshi) Ohno in NIST’s Spectrally Tunable Lighting Facility. Credit: R. Wilson/NIST. No reuse licence is asserted. Source.