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Ultrasonic ranging for the oculometer
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Guy, W. J. |
| Copyright Year | 1981 |
| Description | Ultrasonic tracking techniques are investigated for an oculometer. Two methods are reported in detail. The first is based on measurements of time from the start of a transmit burst to a received echo. Knowing the sound velocity, distance can be calculated. In the second method, a continuous signal is transmitted. Target movement causes phase shifting of the echo. By accumulating these phase shifts, tracking from a set point can be achieved. Both systems have problems with contoured targets, but work well on flat plates and the back of a human head. Also briefly reported is an evaluation of an ultrasonic ranging system. Interface circuits make this system compatible with the echo time design. While the system is consistently accurate, it has a beam too narrow for oculometer use. Finally, comments are provided on a tracking system using the Doppler frequency shift to give range data. |
| File Size | 29336167 |
| Page Count | 90 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810013344 |
| Archival Resource Key | ark:/13960/t4tj3bc02 |
| Language | English |
| Publisher Date | 1981-02-28 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Acoustic Measurement Phase Shift Sound Ranging Continuous Radiation Eye Movements Doppler Effect Ultrasonics Pilot Performance Logic Circuits Pulsed Radiation Microprocessors Oculometers Tracking Position Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
