Sample Exhibit Proposal
Exhibit Proposal “Las Vegas Is Changing” 2.3.03
This exhibit has 2 unique items. The first is the 3D monitor. We have selected a “no glasses” monitor from Stereo Graphics. This is a standard plasma screen with a micro lens array applied to the front. This produces a medium depth 3D image. We recommend light levels be kept down in this area for maximum effect. Also included is the manufacturer’s video card for the playback computer. Not included are any authoring tools from the manufacturer which would be part of the media producer’s scope.
This is the first of many cool exhibits where the video playback is controlled by a mechanical device, in this case a wheel. We have included the encoder for the wheel and the software to provide rate & direction information to the playback computer for use by the program. We have developed the complete software package to play rate controlled video as well and though we have quoted it to several media producers it is not included in this AV integration quote.
This is a note about our interactive motion sensors or a chance to explore your inner nerd.
BBI’s preferred method of sensing motion is optical quadrature encoder. This is a small sealed unit made by HP/Aligent with 2 LEDs and a ½” diameter disk with 1000 tiny slits. The disk is connected to a shaft which we connect to whatever the visitor is moving. This linkage is worked out with the exhibit fabricator but usually just consists of a flexible coupler/universal joint to handle any minor misalignment.
Why do we do this? Because there are no mechanical contacts to wear out or get dirty! This translates directly into longer life (or MTBF to be nerdy). The system works by having the rotating disk block the light from the 2 LEDs producing electrical pulses as the visitor object – shaft – disk turns.
Why 2 LEDs? So we can tell which way things are turning! That’s the “quadrature” part of the description. In the encoder the LEDs are mounted so that the slit in the rotating disk breaks the light from LED “A” and then the light from LED “B”
SIGNAL A _| |____| |____
SIGNAL B ___| |____| |____
All we do is run these 2 pulse trains in to our show controller and it detects “A up, B up, A down, B down” in that order and says “I’m 1/0000 of a turn counter clockwise (note the 4 steps = the “quad” in quadrature). Change the order and we count counter clockwise. We add up all those little counts and we can tell exactly where the visitor control is and how fast it’s moving.
1 42” 3D stereoscopic plasma Stereo Graphics
1 Video Card for display Stereo Graphics
1 Plasma mount
1 Computer Dell/HP High Performance
1 Extender to remote CPU Extron
1 Show Control w/ quadrature MSC
1 Shaft encoder Allignet/US-Servo