If the sensor is enclosed in a housing, surround it with elastic material such as rubber or sponge that will not affect the vibration of the sensor itself. Select materials that will not become rigid when the temperature changes.
Ensure that the vibration of the sensor is not conveyed to the board or housing. If such vibrations are conveyed to the board or housing, the housing may continue to vibrate after reverberations from the sensor have ended, extending the reverberation time.
Keep the space above the sensor’s bevel (top surface) and the range of directionality free of obstructions.
Ultrasonic sensors propagate ultrasonic waves through the air. If the housing blocks the area above the sensor or extends into the range of directionality, ultrasonic waves will reflect off the housing and it will be difficult to actually measure the distance to objects.