Acoustic mapping technology

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Presentation transcript:

Acoustic mapping technology

Agenda Inherent tradeoffs in Acoustics Surface mapping with a wide angle beam Self Cleaning

Inherent tradeoffs in Acoustics Beam angle vs Frequency θ - Beam opening angle λ - Wavelength D - Antenna size D Low frequency => Wide Beam

Beam angle Vs. Frequency F = 2.5KHz λ = 13cm θ = 108⁰ D = 7.5cm

Beam angle Vs. Frequency F = 4.5KHz λ = 7.5cm θ = 60⁰ D = 7.5cm

Beam angle Vs. Frequency F = 10KHz λ = 3.4cm θ = 27⁰ D = 7.5cm

Beam angle Vs. Frequency F = 20KHz λ = 1.7cm θ = 13⁰ D = 7.5cm Narrow beam requires Ultrasonic Frequency

Inherent tradeoffs in Acoustics Sound is a pressure wave Dust particles and humidity in the air attenuate the wave energy Attenuation grows sharply over 5KHz Animation courtesy of Dr. Dan Russell, Kettering University Low freq. => Effective dust penetration

Acoustic wave attenuation Very high attenuation at ultrasonic frequencies 9 9

Acoustic wave attenuation Effective penetration at lower frequencies 10 10

Self Cleaning – Acoustic vibrations A competitive advantage over Radars Acoustic vibrations keep the horns clean on most applications (standard paint)