专利名称：Method, apparatus and transducer for
measurement of dimensions
发明人：Robert G. Berntsen申请号：US06/114156申请日：19800122公开号：US04332016A公开日：19820525
摘要：A method, a device and a transducer for dimensional measurement of objectsby means of ultrasonics, where the objects are carried past at least an ultrasonicmeasuring device consisting of a combined transmitter/receiver or separate
transmitter/receiver. The reflected ultrasonic signals are used to determine characteristicthree- dimensional dimensions of the objects. Said device or devices are arranged eithersuch that the ultrasonic beam or beams therefrom are provided with a reciprocatingmovement which substantially crosses the direction of movement of the objects or byletting the ultrasonic beam or beams therefrom be stationary. The delay of the reflectedsignals is used to form a three dimensional image of the object by means of a computer,said image being compared with known images for identification. The ultra sonicmeasuring device has a narrow, substantially rotation-symmetric radiation diagram. Theultra sonic radiation is directed downwards towards the conveying path through provisionof means arranged above and at a distance from the objects to be measured. Thetransducer uses air as propogation medium and is arranged at a distance from theobjects to be dimensionally measured. The transducer consists of an electro-acousticoscillator arranged coaxially with the centerline of a substantially conical ultrasonic
reflector, the angle of aperture of the reflector relative to the center line through thereflector being equal to 45. degree.. The transducer provides ultrasonics having awavelength in the range of 0.1 to 5 mm, preferably 1.1 to 1.4 mm.
申请人：A/S TOMRA SYSTEMS
代理机构：Nolte and Nolte
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