Method for manufacturing a sound transducer for a field device of automation technology

A method for manufacturing an ultrasonic sensor for a field device of automation technology, the method comprising the steps:

• providing an electromechanical transducer arranged on a lateral surface of an oversized sensor body via at least one adapting layer such that a sound wave produced by the electromechanical transducer, after passing through the sensor body, propagates on an exit surface of the sensor body with a desired propagation velocity, or such that the sound wave produced by the electromechanical transducer propagates at a desired angle to a normal to the exist surface into a medium adjoining the exit surface;
• emitting the sound wave via the electromechanical transducer;
• determining a current propagation velocity of the sound wave on the exit surface or determining a current angle between the normal to the exit surface and a propagation direction of the sound wave in the medium;
• determining the difference between the current propagation velocity and the desired propagation velocity of the sound wave on the exit surface, or determining the difference between the current angle and the desired angle between the normal to the exit surface and the propagation direction of the sound wave in the medium;
• determining the difference between a current velocity of sound in the sensor body and a desired velocity of sound;
• and
• removing material in a region of the exit surface of the sensor body, wherein the remaining material is dimensioned such that the current propagation velocity of the sound wave on the exit surface of the sensor body, and/or of the delay by the current velocity of sound in the sensor body, at least approximately agrees with the desired propagation velocity of the sound wave on the exit surface, or such that the current angle between the normal to the exit surface and the propagation direction at least approximately agrees with the desired angle between the normal to the exit surface and the propagation direction of the sound wave in the medium.