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Applying Ultrasonic Proximity
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2009-11-23
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The ultrasonic sensor emits a sound beamin a beam angle cone that eliminates side
lobes. Target size versus beam spot size isimportant. Theoretically, the smallest detectable
target is one half the wavelength of theultrasonic signal. At 215 kHz, the signal
wavelength is 0.063N. Under ideal conditions,these sensors are capable of sensing
targets as small as 0.032N. Targets usuallyare larger, and are sensed at various distances.
In order to estimate the area coveredby the ultrasonic signal at a given distance,
use the formula.
lobes. Target size versus beam spot size isimportant. Theoretically, the smallest detectable
target is one half the wavelength of theultrasonic signal. At 215 kHz, the signal
wavelength is 0.063N. Under ideal conditions,these sensors are capable of sensing
targets as small as 0.032N. Targets usuallyare larger, and are sensed at various distances.
In order to estimate the area coveredby the ultrasonic signal at a given distance,
use the formula.
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