The Fiber-Optic Helmet Mounted Display (FOHMD) is a flight simulator visual display system. It is designed to offer pilots a 360° field-of-view and stereoscopic scenes of extraordinary resolution and brightness, exactly as human eyes would see a live image, to provide a superior visual display encountered in the simulation of tactical aircraft missions. The FOHMD optimizes the capabilities of current image generation systems through the use of proven optical components and advanced head and eye tracking techniques. This system makes possible realistic visual simulation of the nap-of-the-earth flight, mid-air fuelling, air-to-air and air-to-ground combat and multiple participant scenarios. The development of this project involved the helmet shell as a design required to provide a stable platform on which to mount the optical displays and the head and eye tracking devices, to minimize the mass and inertia, and to incorporate a custom molded liner, as comfortable as a regular flight helmet.
The custom molding procedure required the positioning of the pilot’s head with the mould to include any shift that would occur during the actual molding whilst remaining within the parameters of the optical system range of adjustment. In other words, once the custom liner was inserted and keyed in place inside the helmet shell with the optics (total weight of 7 lbs) mounted on each side, could the optics then be adjusted to the optimal position for performance. The three critical criteria were the inter-pupillar distance, the depth of 33mm between the Pancake Window™ (viewing lens) and the surface of the pupil and the height of the lenses being centered to the pupil. Each of these critical placements is unique and specific to each individual pilot. The helmet shells and the molding equipment were produced in two sizes to accept the anthroprometric range of head sizes, and to accommodate the three sizes of the leather liner inserts. The molding procedure was developed to optimize the simplicity of the task, to reduce the time per procedure, to ensure high levels of accuracy and success per mould and to minimize the discomfort to the pilot whilst meeting the safety requirements of the project.
To ensure optimal performance of the FOHMD simulator, the helmet shell
was developed to provide two integral, rigid, and parallel mounting attachments
for the display optics. It reduced overall mass, inertia and, at the same
time, ensured a strict relationship between the pilot and the visual display.
CAE ELECTRONICS LTD., Montréal,
CRAD - Crew Research in Air Defense Simulator.
Fibre-Optic Helmet Mounted Display
CLIENT - TRANSPORT
CAE ELECTRONICS LTD., Montréal, Québec
CAMSIM - Canadian Airspace Management Simulator.
Pilot and Support Workstations, Transport Canada