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The ground spot size varies from 3.2 m (WCP source, Zenith) to 18 m (entangled source, 20 degrees above horizon) for an orbital altitude of 400 km leading to different geometric losses due to the finite collection aperture of the OGS.
The collection aperture is depicted in Figure 3B as a solid black rectangle.
Wilson et al. described the effect of enlarging the collection aperture on lateral resolution and on optical sectioning [ 14].
Standard laparoscopes (10 mm or 5 mm diameter) have a large field of view (70-135 degrees) and small collection aperture (typically F/8 to F/12).
For single fiber based systems, this translates into using double-clad fibers (DCFs) where the SM core transmits illumination light and the inner cladding acts as a larger collection aperture.
Similar(55)
To accommodate a large range of particle fluxes, the PLASTIC Entrance System employs collection apertures with different geometric factors for the bulk solar wind (H ∼ 96%, He ∼ 4%) and for the heavy, less-abundant ions (<1%) and suprathermal ions.
Both the loading and collection apertures on the opposite sides of the focusing compartments were sealed with adhesive tape.
Hence, the majority of LSS systems are based on fiber optic probes or use multiple collection apertures [ 4, 9, 10, 19].
To investigate the SHG radiation pattern from fascia tissue, images were taken while varying the effective collection numerical aperture (NA).
Along that light path in the forward direction, a centered graduated iris was installed such that the effective collection numerical aperture can be controlled.
Due to these constraints on data collection, sparse-aperture (SA) samples are introduced in modern ISAR systems.
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