1D ULTRASONIC TRANSDUCER UNIT FOR HAZARD IDENTIFICATION FOR A VEHICLE

摘要

The invention relates to an ultrasonic transducer unit (10) for hazard identification for a vehicle comprising a housing (14) attached to the vehicle and having at least three discrete ultrasonic transducers (12) designed to decouple sound waves with a consistent working frequency between 20 kHz and 400 kHz in a gaseous medium, and a control unit designed to individually control each ultrasonic transducer (12), wherein two respective directly neighbouring ultrasonic transducers (12) are spaced apart by a distance (A1), the 1D ultrasonic transducer unit (10) has one sound channel (22) per ultrasonic transducer (12) with an respective inlet opening (24) associated with exactly one respective ultrasonic transducer and with an respective outlet opening (26), wherein the outlet openings (26) are arranged along a straight line, a distance (A2) between directly neighbouring outlet openings (26) corresponds to max. the whole or half the wavelength in the gaseous medium and is smaller than the corresponding distance (A1), a ratio of a surface area of the outlet opening (26) to a surface area of the inlet opening (24) has a value between 0.30 and 1.2, and every sound channel (22) has at least one length corresponding with the diameter of the inlet opening (24).