| 摘要 |
PURPOSE:To attain to enhance measuring accuracy, by bringing a transmission sensor and a receiving sensor parallelly arranged so as to provide a predetermined distance therebetween to such a structure that both sensors can be synchronously rotated to opposite directions so as to obtain max. sensitivity and further providing an angle sensor to calculate a real value. CONSTITUTION:The titled apparatus is constituted of a sensor attachment mechanism 21 having a transmission sensor 23 and a receiving sensor 24 attached thereto, a rotation controller 25 for controlling the rotation of the sensors, a rotary angle detector 26 for detecting the rotary angles of the sensors and a measuring instrument 27 in which display devices 28, 29 respectively displaying max. sound pressure and a distance are assembled. In this apparatus, the real value of a distance is displayed by the measuring instrument 27 from a time required in allowing ultrasonic beam 6 emitted from the transmission sensor 23 to be incident to the receiving sensor 24 while reflecting the same from an object 22 and the max. sound pressure receiving angle theta inputted from the rotary angle detection apparatus 26. By this mechanism, S/N is improved and high sensitivity and high accuracy measurement is enabled.
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