27 August 2003 Wide-field fast scanning spectrograph
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A scanning spectrograph was designed and constructed to provide a new capability for measuring spectra of spatial and temporal recurring atmospheric luminous phenomena. This phenomena may be a new form of natural energy, which exists on several areas of the Earth. Because of the phenomena is often a moving target, existing spectographs are unable to record a spectrum. The instrument is best suited for measuring extended emission line sources, but it is also suitable for work on bright stellar objects, moving sources such as meteors and comets, and conventional indoor industrial applications where a wide field of view and/or a moving target is involved. The challenge of tracking the target is carried out by all-sky cameras. They are used to obtain the target coordinates, which triggers the tracking spectrograph through a multiplexer. The scanning spectrograph uses a high-speed lens system. It projects the incoming wide field light through a horizontal moving slit assembly onto a reflective grating based on a rotary platform that is synchronized with the slit mechanism. The slit width is adjustable, as is the case in conventional spectrographs. An important part of the design is the lateral movement of the entire slit assembly, so that the narrow beam passing through the slit will reflect off different parts of the diffraction grating and be received by the video camera in a scanning mode. As a result, this single device will cover a wide field of view across the range of spectra in a short duration of time. In fact it can obtain a spectrum of 3 × 3 degrees of sky in one second.
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Eamonn Ansbro, Eamonn Ansbro, } "Wide-field fast scanning spectrograph", Proc. SPIE 4876, Opto-Ireland 2002: Optics and Photonics Technologies and Applications, (27 August 2003); doi: 10.1117/12.464052; https://doi.org/10.1117/12.464052

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