| 摘要 |
PROBLEM TO BE SOLVED: To provide a position measuring apparatus capable of accurately measuring the positions of objects. SOLUTION: The position measuring apparatus is provided with a transmission part 1 for transmitting ultrasonic signals, a first and second reception parts 2a and 2b for receiving reflection wave signals of transmitted ultrasonic signals reflected at an object, and an operation part 3 for determining the position of the object on the basis of a plurality of reflection wave signals received by the first and second reception parts 2a and 2b. The operation part 3 determines the position of the object on the basis of both a plurality of detection signals acquired by applying envelope processing to the plurality of reflected wave signals to acquire envelope signals and shaping the envelope signals into a rectangular waveform by a first threshold and a plurality of pulse signals acquired by shaping the plurality of reflected wave signals into a rectangular waveform by a second threshold. COPYRIGHT: (C)2007,JPO&INPIT
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