Concept information
Preferred term
CPFM
Definition
- 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. Additional information available at "http://ess1.ps.uci.edu/%7Ecmclinden/link/xx/node31.html" [Source: University of California, Irvine] (en)
Broader concept
- Particle Detectors (en)
URI
https://gcmd.earthdata.nasa.gov/kms/concept/a9d0a2ed-3df0-499c-bdc1-8914b6bbd4a4
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