Multi Fiber Imaging Spectrometer0 pages
mcPHEHsnn
nnnnMultiple Fiber
nnnnImaging
nnnnSpectrometer
nnnnMULTIPLE FIBER IMAGING
nnnnMcPherson, Inc. has developed an Ultraviolet, Visible
nnnnand Near Infrared Spectrometer System optimized for
nnnnmonitoring fiber coupled telescopes. The 350-mm focal
nnnnlength high resolution, research grade spectrometer
nnnndelivers 0.1-mm scale images near axis and < 0.1 -nm
nnnnspectral resolution. The spectrometer includes a reflec-
nnnntive fiber-coupling accessory to aperture match fast
nnnnfibers to spectrometer optics most effectively. Combined
nnnnwith fast-gated detection system wide range spectra can
nnnnbe collected to monitor or plot over time the characteris-
nnnntic of transient phenomena.
nnnnFor experiments involving remote events or hostile
nnnnenvironments use of a telescope to spatially select and
nnnncollect signal is advantageous. An imaging spectrometer
nnnncan allow more data to be collected since multiple fibers
nnnncan be introduced and dispersed simultaneously. For
nnnnexample, the impact zone of a high-energy projectile
nnnnoften produces a light emission by superheated plasma
nnnnor other detonation. Due to the impact, the immediate
nnnnarea is debris filled and would damage sensitive optical
nnnnelements. Use of telescopes allows collecting signal
nnnnfrom specific areas in the impact zone and analyzing the
nnnnwavelength emission features. Use of multiple tele-
nnnnscopes allows mapping changing spectral characteris-
nnnntics of the impact area from ground zero to the periphery.
nnnnMcPherson builds high quality reflective telescopes for
nnnnthis work. Use in the ultraviolet or over broad wavelength
nnnnranges is facilitated by these devices. They function free
nnnnof chromatic aberration that would otherwise change
nnnnfocus and throughput with wavelength.
nnnnStandard versions exist in 50-mm and
nnnn125-mm clear apertures. These are
nnnnparabolic systems optimally condensing
nnnnthe collected field to small core diameter
nnnnfibers for transfer to the spectrometer
nnnnentrance slit. Use of these tools allows
nnnnspectroscopy and imaging experiments
nnnnwith varying photon energies on multiple
nnnntargets on the nanosecond time scale.
nnnn125-mm clear aperture optical receiver/telescope.
nnnnStill photos from a high-speed image sequence (one millisecond
nnnnbetween each frame) of an impact by a copper sphere traveling at 4.5
nnnnkm/sec into porous pumice. A bright "flash" is a high temperature
nnnnplume resembling a Roman candle that shoots out of the hole created as
nnnnthe projectile penetrates into the target. The éjecta curtain resembles a
nnnnfunnel. These images courtesy of the NASA Deep Impact web site and Dr.
nnnnP. Schultz, Professor of Geophysics with Brown University.
nnnnThe spectrometer system with telescope input optics allows viewing the
nnnnimpact zone from a safe distance.
nnnnMCP@mcphersoninc.com, Tel 978-256-4512, Fax 978-250-8625, McPherson 7A Stuart Road Chelmsford MA 01824 USA
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