| 31. | In the ideal case each objective lens can collect light from a solid angle of \ Omega = 2 \ pi.
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| 32. | This can be modeled as a point spread function ( PSF ) weighted within a solid angle larger than the pixel.
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| 33. | In case of optical instruments or sensors it is a solid angle through which a detector is sensitive to electromagnetic radiation.
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| 34. | The anholonomy induced by a complete circuit of latitude is proportional to the solid angle subtended by that circle of latitude.
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| 35. | Next, emitting area must be converted into a projected area and the solid angle; this product is often called the etendue.
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| 36. | Indeed, as viewed from any point on Earth, both objects have approximately the same solid angle as well as apparent size.
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| 37. | So, with two objective lenses one can collect from every direction ( solid angle \ Omega = 4 \ pi ).
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| 38. | The detector solid angle has to be closed, but the thick sample can take more current without heating, which decreases sample degradation.
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| 39. | Therefore, a detector system with large solid angle as well as high depth resolution may enable corrections for the kinematic energy shift.
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| 40. | This is because it is defined per unit solid angle, the definition of which refers to the area of the detecting surface.
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