Abstract: A method for the manufacture of an array of M.times.N thin film actuated mirrors for use in an optical projection system is disclosed. The method includes the steps of: providing an active matrix; depositing a thin film sacrificial layer; creating an array of empty cavities in the thin film sacrificial layer; forming an array of actuating structures on top of the thin film sacrificial layer including the empty cavities, each of the actuating structures including a first thin film electrode, a thin film electrodisplacive member, a second thin film electrode and an elastic member; forming a thin film protection layer completely covering each of the actuating structures; removing the thin film sacrificial layer by using an etchant; rinsing away the etchant by using a rinse which is DI water or hydrophilic and volatile; removing the rinse by a spin drying method followed by a heat treatment; and removing the thin film protection layer, thereby forming the array of thin film actuated mirrors.

Abstract: The invention relates to a method for measuring the degree of bending in a bent glass sheet. The measuring is effected by cameras having a common imaging field within the boundaries of a surface being measured. The cameras are set at an arbitrary but stationary angle relative to each other. The glass surface along a profile to be measured is made visible to the cameras by an illuminating line whose light has a high intensity over the wavelength ranges of 250-330 nm. Hence, an extremely thin film of tin, left on the glass surface in the manufacture thereof, becomes visible.

Abstract: A visual inspection apparatus (18) is disclosed for viewing welds between pipe sections (26, 28). The apparatus (18) can be part of a combination plug clamp and inspection apparatus (12) or used independently of the plug clamp (12). The TV camera (20) is aimed along the center line axis (52) of the apparatus and pipeline and a mirror (76) reflects the image of a portion of the weld into the lens of the camera. The mirror can be rotated to allow the entire circumference of the weld to be inspected. A weighted ring (102) provides a reference relative to the vertical independent of the orientation of the apparatus within the pipeline.

Abstract: The off-axis joint transform correlator improves on the extant on-axis jo transform correlator by eliminating the requirement for a second laser frequency and the means for blocking the first laser frequency from propagating beyond a given point in the correlator. These eliminations are accomplished by using a beamsplitter and a mirror to bring a second portion of the first frequency at an angle to read the pattern information written onto a spatial light modulator by the first portion.

Abstract: All critical wheel wear measurements on a static or in-motion train wheel are taken using a non-contact method/system. The train wheel is measured using a modulated point beam of energy impinging the wheel surface from an orthogonal direction, moving the point beam across the wheel surface, and sensing the unique modulated reflection of the wheel using energy sensors that produce analog signals. The analog signals are digitized and processed to produce all critical wheel wear measurements without removing the wheel from the train.