The ultrasonic sensor emits a sound beamin a beam angle cone that eliminates sidelobes. Target size versus beam spot size isimportant. Theoretically, the smallest detectabletarget is one half the wavelength of theultrasonic signal. At 215 kHz, the signalwavelength is 0.063N. Under ideal conditions,these sensors are capable of sensingtargets 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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