Volumetric 3D displays are frequently purported to lack the ability to reconstruct scenes with viewer-position-dependent effects such as occlusion. To counter these claims, a swept-screen 198-view horizontal-parallax-only 3D display is reported here that is capable of viewer-position-dependent effects. A digital projector illuminates a rotating vertical diffuser with a series of multiperspective 768 x 768 pixel renderings of a 3D scene. Evidence of near-far object occlusion is reported. The aggregate virtual screen surface for a stationary observer is described, as are guidelines to construct a full-parallax system and the theoretical ability of the present system to project imagery outside of the volume swept by the screen.
Over the past two decades major advances in FTS have allowed process control engineers to more readily consider the use of this measurement technique. The most striking advance has been in the area of data processing facilitated by extraor.-dinary increases in computing power. The development of improved optical fibers has provided a means for bringing the measurement to the factory floor while providing a remote "laboratory environment" site for the less-than-robust spectrometer optical systems. Recent advances in auto-aligned systems again permit consideration of moving the spectrometer system to locations in close proximity to the process itself. Generally, these systems are based on the use of HeNe lasers for the reference and auto-align mechanism. This results in large and expensive measurement heads to again argue against placement of the spectrometers proximate to the process.This paper describes the successful use of a solid state light source in place of the HeNe laser in an auto-aligned and referenced FTS system which allows consideration of small and inexpensive process control spectrometers. A review of a spectrometer system utilizing a combination of auto-align and referencing technologies utilizing diode sources is presented. DOD and NASA support enabled this dual-use technology to be developed.
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