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Instrument: CPFM : Composition and Photodissociative Flux Measurement
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The Composition and Photodissociative Flux Measurement (CPFM)
instrument is a small, light-weight photodiode array
spectrometer. It measures the solar flux on a horizontal
surface, the vertical and horizontal polarized limb radiance
components, and the along-track and cross-track polarized nadir
radiance components. The limb observations consist of a
ten-point scan. The detector is an EG&G 1024-element,
photodiode array and is positioned at the focus of an f/2
concave, holographic diffraction grating. Filters are used to
allow only light in either the first order, 375-775 nm, or the
second order, 188-388 nm, to be focused onto the array. In
addition, polarizers are used to select one polarization
component of the limb or nadir radiance and reject the
other. Due to the increased absorption by ozone combined with
declining UV sensitivity there are no useful data below 300 nm.

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[Source: University of California, Irvine]