Goggle System

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Dual presentation Goggle and Eyetracking system Installation Notes, Hardware List, and guidelines for use

Resonance Technologies
Gideon Caplovitz
12/11/05


Below you will find a list of all of the equipment needed to use the goggle system, including the cameras and behavioral interface. Also included in this list are some basic assembly tips. Following that list are more detailed guidelines for use.

Hardware List and basic install tips

Basic equipment:

  • Goggles
  • Goggle face-molding
  • Corrective lenses
  • Headset

Note: The headset and goggles both connect to the goggle unit. The headset also has a microphone and it interfaces with the intercom/remote controller in the scanner room.


Power Supply

The power supply is located in the scanner room. Because it contains magnetic material use EXTREME CAUTION when moving. When on, it should read 8V, -20V, and +20V. Its fuses should be taped to the underside of the unit. If the lights go out, check the fuses. When not in use turn it off using the power switch on the box and turn off the goggles as well.


Goggle Unit

The goggle unit is located (and under many lights) in the scanner room. It is powered by the power supply and serves as a breakout box for goggles, intercom, and camera power. It takes input from:

  • Large fiber optic cable
  • Power chord from power supply

It sends output to:

  • Goggle unit
  • Intercom system
  • Camera buffer power cord


Controller

Located in the controller room, the controller takes input from:

  • VGA in (right for goggles in mono mode)
  • VGA in (right and left for goggles in stereo mode)
  • Audio In from external audio source
  • Intercom/Remote control
  • VGA in (left for eyetracker)

The controller sends output to:

  • Large fiber optic cable
  • Audio out to external speakers
  • VGA “Output” to mirror display -> needs to warm up

Note: The controller can take time to warm up, but if it does not seem to be working, try cycling power on the power supply.


Remote Controller/Intercom

The remote controller/intercom is located in the scanner room. It connects to both the external speaker and the controller.


Eye Tracker

The PCI card is installed in the computer in the backroom. Viewpoint software and drivers are also installed. Two BNC cables connect the card to the wall panel in back (owned by DBIC) and two BNC cables connect the wall panel to the camera breakout box in the scanner.


Eye tracking Software: Viewpoint

The software is located on the computer. In order to calibrate/position the cameras, the subject must be able to view own eye/eye tracking calibration software. This requires video output from eye tracking computer to goggles. Use left VGA input and operate control unit in “mono left” mode. In case of an issue, the software comes with 200 page manual and tutorials, which are located in the documentation folder.


Cameras

The cameras are attached to the face-molding, and this molding can then be attached to goggles. Be EXTREMELY CAREFUL handling the camera unit.

  • DO NOT touch the reflective surfaces
  • USE CAUTION WITH CABLES: keep them away from the subject's skin. You may want to pad the cables with foam to protect the subject.

Note: Each camera should have two long cables. These cables connect to the camera breakout.


Camera Breakout box

The camera breakout box receives power from goggle unit. It outputs to the two yellow BNC cables and receives input from the two cameras, as described above. Be sure to switch the power switch off while unplugging the cables


Behavioral Interface

The behavioral interface includes a joystick and a trackball. USB cables and serial breakout boxes for the controller and the trackball are located in the control room. The USB plugs into the stimulating computer. The serial cable plugs into another cable that then runs into the back room and plugs into the interface panel. (Note: Muhktar installed a filter panel for the serial port and removed an unused panel. Both are labeled).

Inside the scanner room is a cable plugged into the interface panel. The joystick and trackball both plug into this cable. The joystick needs to be calibrated once for each computer it is attached to.

Note: You'll need to screw in connectors with a non-magnetic screw driver.


Summary

The control unit in the scanner suite is connected to external speakers, intercom/remote control, and mirror display. It outputs a big fiber optic cable that runs via the back room into the scanner. The fiber optic cable is the “magic cable” and plugs into the goggle unit. The goggle unit is powered by a power supply that lives in the scanner (USE WITH EXTREME CAUTION- has magnetic material!).

The goggle unit outputs to the goggles and intercom, as well as powering the camera breakout box. The cameras are housed in a special face molding that can be attached to the goggles (use with extreme care). The camera breakout box has a power switch that should be turned off, along with the power supply, when not in use. The outputs of the cameras run to the back interface panel and then to the computer/card in the back.

The trackball and joystick share a common cable that runs to the back interface panel (cabinet) and then from the back room to the control room where breakout boxes can be plugged into the appropriate computer (via USB). The various modes of operation (mono-left, mono-right, stereo-flicker, stereo disparity) are controlled by remote unit as are the various modes of communication.

Guidelines for use

Powering on sequence

  1. Attach laptop computer output VGA cable to upper of two "VGA out to Goggles" adapter.
  2. Set output of laptop to 800x600 screen resolution
  3. Attach Video Output VGA cable to "output to rear projector adapter

For eyetracking Verify screen resolution of eyetracking computer to be 800x600 at 60hz

  1. Power on Goggle Controller by toggling rear switch
  2. Once all lights have stabilized turn on power supply in back room

NOTE: Goggle transducer should now have 6 blue lights on and display should be visible in goggles

Handling of goggles

  1. Slide rubber box around to be next to scanner-table
  2. Open top and carefully remove headset and goggles
  3. Take care not to touch goggle displays leaving finger prints
  4. Check to make sure all rubber face moulding "latches" are attached properly

Controlling the displays

  1. Use the white remote interface unit
  2. Rightmost dial controls the menu
  3. To display primary stimulation input use video mode mono-R
  4. To display secondary stimulation input (i.e., eyetracker) use video mode mono-L
  5. For independent display for 3D use Stereo-R or Stereo-L (NOTE: Stereo-R outputs "primary input" to the right eye and secondary to the left. Stereo-L outputs visa versa.)
  6. Using the Remote interface you can independently adjust the brihtnness of either goggle display. It is important that these become equi-calibrated at some point.

Audio

Please see Goggle Sound System

Setting up subject

  1. Have subject lie down in coil dish
  2. Slide Box around next to scanner table and carefully remove headset and goggles untangling as necessary.
  3. If using cameras, attach camera unit to goggles
  4. Position Headset and Microphone accordingly
  5. Position Goggle unit. EXTREME NOTE: USE CARE IN POSITIONING CABLES
  6. Goggles should rest on subjects face (If the subject "does not fit in coil" DO NOT PRESS GOGGLES DOWN ONTO FACE, MUST not use subject.
  7. Via intercom, confirm appropriate volume levels.