GHRS Instrument Science Report 0631 LINE SPREAD FUNCTIONS AND RESOLUTION FOR GHRS-LSA SPECTRA WITH COSTAR
نویسنده
چکیده
Deployment of the COSTAR mirrors for GHRS has successfully cancelled the deleterious eeects resulting from spherical aberration of the HST primary mirror. Prior to COSTAR, the Large Science Aperture (LSA) line spread function (LSF) was characterized by a Gaussian core nearly twice as broad as that provided by the instrumental resolution limit with extended non-Gaussian wings. After COSTAR the LSF for the LSA is only 20-30% broader in a Gaussian core than spectra from the SSA and the extended wings are absent.
منابع مشابه
Improved Medium Resolution Line Spread Functions for COS FUV Spectra
We have developed an improved line spread function (LSF) for the medium resolution farultraviolet gratings (G130M and G160M) of the Cosmic Origins Spectrograph (COS) by taking into account scattering in the far wings due to microroughness on the HST primary mirror. We start with the preliminary model LSFs that include the broad, non-Gaussian wings caused by mid-frequency wave-front errors (MFWF...
متن کاملQuantum super-oscillation of a single photon
Super-oscillation is a counterintuitive phenomenon describing localized fast variations of functions and fields that happen at frequencies higher than the highest Fourier component of their spectra. The physical implications of this effect have been studied in information theory and optics of classical fields, and have been used in super-resolution imaging. As a general phenomenon of wave dynam...
متن کاملA digitally generated ultrafine optical frequency comb for spectral measurements with 0.01-pm resolution and 0.7-ms response time
Optical spectral measurements are crucial for optical sensors and many other applications, but the prevailing methods, such as optical spectrum analysis and tunable laser spectroscopy, often have to make compromises among resolution, speed, and accuracy. Optical frequency combs are widely used for metrology of discrete atomic and molecular spectral lines. However, they are usually generated by ...
متن کاملSparse spectral deconvolution algorithm for noncartesian MR spectroscopic imaging.
PURPOSE To minimize line shape distortions and spectral leakage artifacts in MR spectroscopic imaging (MRSI). METHODS A spatially and spectrally regularized non-Cartesian MRSI algorithm that uses the line shape distortion priors, estimated from water reference data, to deconvolve the spectra is introduced. Sparse spectral regularization is used to minimize noise amplification associated with ...
متن کاملA Sparse Spectral Deconvolution Algorithm for Non-cartesian Mrsi
Purpose: To minimize line shape distortions and spectral leakage artifacts in MR spectroscopic imaging. Methods: A spatially and spectrally regularized non-Cartesian MRSI algorithm that uses the line shape distortion priors, estimated from water reference data, to deconvolve the spectra is introduced. Sparse spectral regularization is used to minimize noise amplification associated with deconvo...
متن کامل