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Abstract

An optical projection system is described that may be used in an optical computing element. The optical projection system has an optical axis and comprises first, second and third lens arrangements. The first and third lens arrangements are rotationally symmetric about the optical axis and are positioned to capture light from an array of sources on a source plane and image the sources onto an output plane. The second lens arrangement is positioned between the first and third lens arrangements. The second lens arrangement has optical power of a first magnitude in a first orientation and optical power of a second magnitude in a second orientation, wherein the first magnitude is larger than the second magnitude and wherein the first orientation is orthogonal to the second orientation and both the first and second orientations are orthogonal to the optical axis.

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