Sumários
JWST: NIRSPec, NIRISS
22 Março 2024, 09:00 • José Manuel Rebordão
NIRSpec Integral Field Units - architecture,
optical path
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Spectroscopy (class 1 in 2)
20 Março 2024, 15:00 • Alexandre Pereira Cabral
Analysis and operation of spectrometers and monochromators to have an introductory approach to spectral decomposition of polychromatic light.
Study of the dispersion of light, the properties of diffracting elements and how they are used in monochromators and spectrographs, and the concepts of spectral resolution and resolving power.
Characterization of non-monochromatic light.
JWST: NIRCam, MIRI e NIRSpec
18 Março 2024, 14:00 • José Manuel Rebordão
NIRCam – additional issues concerning the pupil and
filter wheel and the role of the collimator group. Examples during
commissioning on coronography and spectroscopy
MIRI – Overview. Entrance mask and FoV
functionalizing. Optical train. Filters. Detectors and subarrays. 3D
animations. MIRIM and LRS. Brief reference to MSR.
NIRSpec – Optical system and different conjugations for image and pupil planes. Multishutter array, and its relation with the detector array. Filter and dispersing elements.
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NIRspec – IFU. Detectors.
JWST: FGS, NIRCam
15 Março 2024, 09:00 • José Manuel Rebordão
Functions of the FGS and its
architecture.
NIRCam: Architecture of the instrument.
Beam-splitter. Analysis of the functions of the filters in the filter and pupil
wheels. Coronographic mask and their “half-tone” implementation.
The Weak Lenses and the Pupil Image
Lens.
For the OTE and different instruments:
huge importance of the two sets of conjugations: between different real image
planes, and between the stop (at the PM) and the different real pupil images.
Introduction to MIRI
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Holography (class 3 of 3)
13 Março 2024, 15:00 • Alexandre Pereira Cabral
Setup of a Denisyuk configuration, consisting of a volume-reflection holography technique. As a recording medium, a silver halide emulsion on a glass plate will be used (a matrix of cohesive silver crystals in a transparent medium). During exposure, the reference wave and the waves reflected from the object result in an interference structure that was recorded within the emulsion.
Students produced their own objects that will be exposed in a 50 mm x 50 mm plate.
Students performed several exposures using different types of objects (including lenses or mirrors to generate holographic optical elements known as HOE.
Analysis of non-holographic technics, bases on the Peper’s ghost concept, will be shown in the lab for analysis.