Ultrasound - space monitoring system according to the impulse - echo - the method

摘要

1. An ultrasonic space monitoring system utilising the pulse-echo-method, wherein an ultrasonic transmitting/receiving transducer (1) transmits periodic scanning pulses, and wherein the ultrasonic transmitting/receiving transducer (1) is switched so as to be ready to receive during the time interval between two scanning pulses, and wherein the time sequence of echo signals, which can be allocated to a scanning pulse, having passed through an analogue/digital converter (3), is read into a store (4, 4') as a digital image in the form of a sequence of binary words in the order of their arrival, where a binary word represents the acoustic image of a measurable spacial zone (0-6) shaped like a spherical shell with the ultrasonic device in the centre, and wherein at least two sequences of binary words, which are consecutive in time, which represent digital images of the overall space, are compared with one another in a comparison device (5) in such manner that in the case of a deviation between at least two binary words concerned, a relevance check (RP) is carried out, whereby in accordance with the intended purpose of the ultrasonic space monitoring system irrelevant deviations caused, for example, by periodic movements of echo-producing objects remain unanalysed, and wherein when a relevant deviation is present an alarm device (6) is activated, characterised in that in order to check the speed of possible movements of objects the Doppler effect is utilised and that there is arranged in the respective binary words at least one bit which serves to mark the speed indicated by means of the Doppler effect.