| 摘要 |
The invention relates to a device for detecting the presence of an object or of a living being between two end points. This device comprises, on the one hand, a means for emitting an electromagnetic signal comprising an emit antenna associated with a first end point, and a means for exciting this antenna so as to make this antenna emit such a signal and, on the other hand, a means for receiving this electromagnetic signal comprising a receive antenna associated with a second end point, together with means for detecting such a signal. This detection device is characterized in that the emit and receive antennas each adopt the form of a tubular waveguide having at least one wall provided with at least one opening. The invention further relates to an installation for protecting, for counting or for closing an opening equipped with such a detection device. |
