| 摘要 |
A proximity sensor for measuring the distance from an object contains a microwave oscillator which provides, as an output signal, a transmission wave which is emitted by the proximity sensor in the direction of the object as a free space transmission wave which is reflected by the object, which is electrically conductive or has at least one electrically conductive surface, as a free space reflection wave and is received by the proximity sensor as a reflection wave. The reflection coefficient is determined from the transmission wave and the reflection wave and is provided by the proximity sensor as a measure of the distance. The transmission wave is guided in a waveguide as a waveguide transmission wave, the transmission wave is injected into the waveguide with a wave mode which results in the waveguide transmission wave being separated at the aperture at the front end of the waveguide into the free space transmission wave and in the free space transmission wave propagating to the object. |
