Proxim RangeLAN2 7920 Manual de usuario descargar pdf (Pagina 22)

d. Sensors:

The current sensor project for the SMART robot is the Seismo-Acoustic

sonar under development by a group in the CSS&T curriculum under the supervision of

Dr Thomas Muir. This sonar generates and exploits Rayleigh wave phenomena, which

propagates outward from the signal source and remains near the surface. Sophisticated

signal analysis and filtering techniques make this sonar a good fit for the detection of

buried mines in the surf-zone.

The towed platform (Figure 5.) is the transmission portion of the Seismo-

Acoustic sonar. A microprocessor creates the desired output waveform that is amplified

by the acoustic amplifier on the forward end of the towed unit. The amplified signal is

then fed into a series of acoustic “thumpers” which are located in the aluminum cylinder

at the rear of the towed unit. The cylinder was chosen as a vehicle for the thumpers

because it allows the maximum surface contact area (and therefore maximum energy

transfer) with the ground while allowing a platform that the robot would be able to tow.

Seismometers will either be placed onboard the thumper unit or deployed by a separate

platform.

Figure 5. Seismic Sonar

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Proxim RangeLAN2 7920 Manual de usuario Pagina 22