Échelle meaning

Also note that while the spectral format of the E140M extends down to 1123 Å, HST's total system throughput is extremely small below about 1144 Å.

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A single E140M echellogram covers ~600 Å, however at wavelengths longward of 1649 Å, the echelle orders overrun the width of the detector in the dispersion direction, so there will be three small gaps in the wavelength coverage. One gap of ~0.2 Å, one of ~0.4 Å, and one of ~0.7 Å occur between 1649 and 1700 Å.

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LASER stand for Light Amplification by Stimulated Emission of Radiation. Light that is emitted by a laser is coherent, which just meansthat the emitted ...

Newportechelle Grating

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Echelle gratingspectrometer

"Hand lens" redirects here. For a magnifying device held close to the eye, see Loupe. Learn more. This article needs additional citations ...

Echelle gratingpdf

The E140M grating is used with the FUV-MAMA and provides echelle spectra at a resolving power of 45,800 from ~1144–1729 Å.

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The top axis displays constant Fλ values corresponding to the STMAG units (V+STMAGλ) on the bottom axis. Recall that STMAG=0 is equivalent to Fλ = 3.63E–9 erg/cm2/s/Å. The curves are labeled with exposure times in seconds.

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Point source sensitivity assumes full transmission (zero slit losses). Diffuse source sensitivity assumes a 0.1" wide slit. To convert point source sensitivities to diffuse source sensitivities multiply the point source values by the grating spatial (cross dispersion) plate scale in units of arcseconds per pixel and by the width of the desired slit in units of arcseconds.

The mechanism of spatial filtering, shown below, consists simply of moving the filter mask from pixel to pixel in an image. At each pixel. (x,y), the response ...

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