The first principle consists in measuring the phase-shiftbetween continuously transmitted and received signals. Themeasured phase-shift [ch952] is proportional to distance d, andthese quantities are related by 360·d = [ch952]·[ch955], where [ch955] is thewavelength. The limitation in this principle is that themeasurable distance range, without ambiguity, is only from0 to one wavelength. For instance, at 20 ºC, a systemoperating at 40 kHz would only measure, withoutambiguity, distances up to 8.6 mm
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