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Linear (spectro) polarimetry is usually performed using separate photon flux measurements after spatial or temporal polarization modulation. Such classical polarimeters are limited in sensitivity and accuracy by systematic effects and noise. We describe a spectral modulation principle that is based on encoding the full linear polarization properties of(More)
To assess the impact of atmospheric aerosols on health, climate, and air traffic, aerosol properties must be measured with fine spatial and temporal sampling. This can be achieved by actively involving citizens and the technology they own to form an atmospheric measurement network. We establish this new measurement strategy by developing and deploying(More)
Audiometric characteristics of a recently introduced more powerful, behind-the-ear, BAHA sound processor, the BAHA Intenso, were evaluated in 23 patients with contra-indications for using conventional hearing aids. All patients had mixed hearing loss with boneconduction thresholds ranging between 30 and 50 dB HL. Boneconduction gain, defined as the(More)
It is generally assumed that auditory stimulation since birth is important for the proper development of the central auditory nervous system. Whether auditory deprivation occurs in man and, therefore, whether it may be considered as a contraindication to surgery in unilateral congenital middle ear anomalies and atresias is the subject of the present study.(More)
Many objects on the sky exhibit a centrosymmetric polarization pattern, particularly in cases involving single scattering around a central source. Utilizing a novel liquid crystal device (the " theta cell ") that transforms the coordinate system of linear polarization in an image plane from Cartesian to polar, the observation of centrosymmetric polarization(More)
We present SPEX, an innovative, compact, and robust Spectropolarimeter for Planetary EXploration, that measures fluxes F and polarization P of sunlight reflected by Mars from 400 to 800 nm with 2 nm (F) to 20 nm (P) spectral resolution, in 9 fixed viewing directions. With SPEX, dust and ice cloud particles in the atmosphere and the surface can be studied.(More)
A concept is presented for an extremely large high-resolution solar telescope with an aperture of 11 m and diffraction limited for visual wavelengths. The structure of GISOT will be transparent to wind and placed on a transparent stiff tower. For efficient wind flushing, all optics, including the primary mirror, will be located above the elevation axis. The(More)
SPICES: spectro-polarimetric imaging and characterization of exoplanetary systems. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Abstract SPICES (Spectro-Polarimetric Imaging and Characterization of Exoplanetary Systems) is a five-year M-class mission proposed to ESA Cosmic Vision. Its(More)
In polarimetry it is important to characterize the polarization properties of the instrument itself to disentangle real astrophysical signals from instrumental effects. This article deals with the accurate measurement and modeling of the polarization properties of real aluminum mirrors, as used in astronomical telescopes. Main goals are the characterization(More)
Circular polarization spectroscopy has proven to be an indispensable tool in photosynthesis research and (bio)-molecular research in general. Oxygenic pho-tosystems typically display an asymmetric Cotton effect around the chlorophyll absorbance maximum with a signal ≤ 1%. In vegetation, these signals are the direct result of the chirality of the(More)
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