Abstract: The present invention relates to an apparatus and method of a real-time, monitoring and control feedback system for a 2-D spectrometer application, to correct for active optical axis pointing misalignments or jitter (i.e., tip, tilt), that result in degraded scientific image integrity, unwanted spatial crosstalk and image blurring artifacts which severely limit the applications for high resolution spectrometer image data. The present invention provides a unique system architecture which ensures the most direct optical axis motion detection and control capability that will enable sub-pixel image motion monitoring and boresight control stability, thus, maximizing the science image quality.

Abstract: A moving essentially non-porous web is positioned above and in close proximity to the upper surface of a narrow, very shallow pool of coating solution. A coating meniscus extends directly from the upper surface to the web to transfer coating solution from the pool to the web. Stagnation of solution in the pool is eliminated by feeding solution to the pool at the center and bottom thereof, and removing excess solution through ports at the top surface of the pool at each end thereof.

Abstract: Apparatus for applying a coating of photographically sensitive liquid on one side of a moving aluminum web is constructed with a backing or support roller having stepped portions at each end of an unstepped central portion. The latter is engaged with the anterior surface of the web and is narrower than the web so that coating liquid applied to one surface of the web does not migrate to the edges of the web to contaminate the anterior side thereof. The width of the central portion is great enough so that mechanical stress on the web is not excessive and the undercut height is sufficient to exceed deflection of the web at the edges thereof.