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  • 1
    Electronic Resource
    Electronic Resource
    The project “spice” (1994)
    Springer
    Astrophysics and space science 217 (1994), S. 41-44 
    Details
    ISSN: 1572-946X
    Keywords: IR spectroscopy ; survey ; satellite ; Interstellar Medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Proposed to both the French and the European Space Agency as one possible small mission, SPICE is a project for a dedicated small satellite for a near-IR spectroscopic all-sky survey. The instrument would cover the spectral range 1.8 - 3.6µm, possibly extended to 1.8 - 7µm, at a resolution of ≈ 100, with pixels of 1 arc-min. The excellent sensitivity (0.02 MJy sr-1) results from: i) the quasi-zero level of background due to the efficient passive cooling of the whole experiment; ii) the use of large format arrays; iii) the non-stop observing mode (drift-scanning). The spectral domain, complementing the one of ISO, partially opaque from the ground, is specially rich in spectral features tracing stars and all components of the Interstellar Medium (molecular, atomic and ionized gas, dust). With a cooling below 80 K of the focal instrument, then it becomes possible to consider doubling the spectral domain and to cover the whole 1.8 - 7µm range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990021
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Inductive grids in the resonant region: Theory and experiment (1985)
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 511-575 
    Details
    ISSN: 1572-9559
    Keywords: Filters ; Inductive grids ; Modal expansion methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We compare rigorous modal expansion methods with transmission-line models for the spectral properties of inductive grids. We compare the predictions of the former with measurements of grid transmittance, reflectance and phase angles as a function of wavelength. We show that the rigorous theory can accurately reproduce measured grid properties, both for normal and oblique incidence, and for both fundamental polarizations of incident radiation. We pay particular attention to the so-called “thickness dip”, an abrupt drop in transmittance which occurs for one polarization at off-normal incidence. We study the variation of $$\lambda _a$$ , the wavelength of the thickness dip, with grid parameters. We also study the variation of $$\lambda _m$$ , the wavelength of maximum transmittance, with grid parameters. We give four design rules which enable the optimization of grid parameters for use in multi-element filter stacks not relying on interference properties. We present a comprehensive set of curves showing the variation of spectral transmittance with grid aperture and thickness, for both fundamental polarizations and for a range of angles of incidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009671
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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