11 August 1998 Phase-based optical metrology system for helmet tracking
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Abstract
Current and planned helmet system require precision metrology technique in order to provide accurate pointing information with low latency times. Existing systems using magnetic sensors to determined helmet position and orientation can provide adequate information to meet most requirements, however, the amount of time required for mapping the magnetic field within an aircraft cockpit is often seen to be excessive. While highly accurate optical based metrology systems can be designed to overcome the time consuming cockpit mapping problem, they have also been criticized as being overly complex and unsuitable for aircraft use. Visidyne, Inc. has developed an optical system that uses a proprietary measurement technique to measure the phase of low power, eyesafe, intensity modulated light beams, which, when properly installed within the cockpit can measure the x, y, z position and roll, pitch, yaw of the helmet, providing pointing precision that is within 1 milliradian, at an update rate of at least 100 Hz over a large motion box. The technique uses state-of-the-art electronics and optics that are both robust and reliable and add minimally to the helmet mass. This paper describes two approaches for applying this technology to the helmet tracking problem, each using precise measurements of distance between points on the helmet and known locations within the cockpit.
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Alfred Dale Ducharme, Alfred Dale Ducharme, Peter N. Baum, Peter N. Baum, Geert J. Wijntjes, Geert J. Wijntjes, Orr Shepherd, Orr Shepherd, Constantine T. Markos, Constantine T. Markos, "Phase-based optical metrology system for helmet tracking", Proc. SPIE 3362, Helmet- and Head-Mounted Displays III, (11 August 1998); doi: 10.1117/12.317435; https://doi.org/10.1117/12.317435
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