The FacultyThe Faculty · Orfeo Edition
Orfeo
The lab
10 instruments- INST·120◆Orfeo EditionexperimentThe ScanComputed tomography from first principles — X-rays through a veiled body return only line integrals, and filtered back-projection rebuilds the slice the beams never saw; narrow the angles and the null space appears as the streaks of a missing wedge.inverse-problemtomographyfourierimaging
- INST·121◆Orfeo EditionexperimentThe PixelA camera with one pixel: random masks on a veiled scene, one number each, and a picture recovered from fewer measurements than it has pixels — compressed sensing beats Nyquist when the world is sparse, and the residual shows where it is not.inverse-problemcompressed-sensingsparsityimaging
- INST·122◆Orfeo EditionexperimentThe PhaseThe problem behind Photo 51: a diffraction pattern keeps only intensities and throws the phases away — yet a loop between two constraints recovers the veiled object, up to a twin no data can tell apart.inverse-problemphase-retrievaldiffractionfourier
- INST·123◆Orfeo EditionexperimentThe HologramGabor’s “whole picture”: light from a veiled 3-D scene meets a reference wave and the plate keeps only fringes — refocus them through depth, watch the twin ride along in-line, and find that every fragment of the plate still holds the whole scene.inverse-problemholographyinterferencefourier-optics
- INST·124◆Orfeo EditionexperimentThe MirrorHubble’s flawed mirror, 1990: a figuring error of about 2.2 µm blurred every star — deconvolution recovers the detail the blur only weakened, stops where the misfit meets the noise, and returns nothing of what the aperture never passed.inverse-problemdeconvolutionopticsastronomy
- INST·125◆Orfeo EditionexperimentThe LineCecilia Payne’s 1925 inversion: from dark lines in a veiled star’s light, solve for its temperature and make-up — and find that stars are mostly hydrogen, a result she was persuaded to call spurious.inverse-problemspectroscopyastronomysaha
- INST·126◆Orfeo EditionexperimentThe CoreNo one has seen the Earth’s core. Quakes cast a shadow across the far side of the world, and from faint arrivals inside it Inge Lehmann inferred, in 1936, a solid core within the liquid one.inverse-problemseismologyray-tracinggeophysics
- INST·127◆Orfeo EditionexperimentThe FixGPS is a clock problem: four satellites for four unknowns — where you are, and how wrong your clock is — and the geometry of the sky multiplies every nanosecond into metres. Ignore relativity and the fix walks away by kilometres a day.inverse-problemgpsrelativityleast-squares
- INST·128◆Orfeo EditionexperimentThe VoidMuons from the sky pass through stone. Count them under a pyramid for months, and a small excess from one direction reveals a chamber no one has entered.inverse-problemmuographycosmic-rayspoisson
- INST·129◆Orfeo EditionexperimentThe DishTurn the whole Earth into one telescope: a handful of dishes, rotating with the planet, sample the sky’s Fourier plane — and CLEAN draws a black hole’s shadow out of the gaps.inverse-probleminterferometryradio-astronomyfourier