AIRBORNE ULTRASONIC SENSOR

摘要

This airborne ultrasonic sensor is equipped with: a tubular case (1) with a bottom that has an opening on one end in the axial direction thereof and the bottom on the other end; a piezoelectric vibrator (2) that is fixed to the inner bottom surface of the tubular case (1) with the bottom; and a piezoelectric vibrator (3) that is fixed to the outer bottom surface of the tubular case (1) with the bottom and has a direction of polarization opposite to that of the piezoelectric vibrator (2).