| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic three-dimensional distance measuring device capable of measuring a three-dimensional position and a three-dimensional shape of an object having reflected a transmitted ultrasonic wave even if the distance between centers of ultrasonic receiving elements is longer than the half wavelength of the transmitted ultrasonic wave, and an ultrasonic three-dimensional distance measuring method. SOLUTION: This ultrasonic three-dimensional distance measuring device measures the three-dimensional position and the three-dimensional shape of the object (target T) having reflected the ultrasonic wave W1 by performing electronic scanning in at least two directions. The measuring device comprises a modulating means 3 for AM-modulating an oscillation signal S1 by a pulse signal S2, an envelope detecting means 6 for envelope-detecting a received signal S4, and a delay multiplying means 8. Assuming that the pulse width of the pulse signal S2 is denoted asτ(s), the maximum value of the distances between centers of all ultrasonic wave receiving elements 5 along all directions for performing electronic scanning is L (m), and the speed of the ultrasonic wave W1 is v (m/s), a relation ofτ<L/v is established. At least one of the distances between the centers of adjacent ultrasonic wave receiving elements 5 along all the directions for performing electronic scanning is larger than a half of the wavelength of the ultrasonic wave W1. COPYRIGHT: (C)2009,JPO&INPIT
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