1. Acoustic mapping technology

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

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

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

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

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

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

8. 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

9. Acoustic wave attenuation
Very high attenuation at ultrasonic frequencies 9 9

10. Acoustic wave attenuation
Effective penetration at lower frequencies 10 10

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