Ultrasonic doppler sensor

The utility model provides an ultrasonic doppler sensor, this sensor include casing, sound wedge and piezoceramics piece, are equipped with the installation cavity in the casing, and the sound wedge is installed in the installation cavity internally, and the top of wedge is located to the piezoceramics piece, and the casing is equipped with and installs the top end opening that the cavity is linked together, and top end opening department covers there is the embedment board, and the internal position being close to the top end opening of installation cavity is equipped with the division board,and it has the damping thing to pack between division board and the embedment board. Based on above -mentioned structure, the damping thing can effectual absorptions back to the sound wave, reach before the reinforcing purpose to sound wave, improvement transducer sensitivity, and isolation structure that division board and cushion cap are constituteed can the downward seepage of separation damping thing and flow to the