| 摘要 |
An optoelectronic proximity sensor having an emitter which directs optical pulses towards a surface as well as a receiver which is oriented toward the point at which the emitted optical pulses impinge on the surface so as to receive a portion of the optical pulses which are scattered back from the surface. The emitter is connected to a pulse generator which causes the emitter to emit the optical pulses at a given pulse repetition frequency. The pulses received by the receiver are evaluated, this being done by a highpass filter which is connected to the receiver and which itself has a limit frequency that is at least approximately equal to the pulse repetition frequency of the pulse generator. A memory circuit is connected to the output of the highpass filter for storing a series of pulses received by the receiver, the arrangement of the parts being such that the memory circuit is rendered capable of receiving the pulses at the beat of the pulse repetition frequency. A control circuit is connected to the output of the memory circuit and puts out an actuation signal when the memory circuit has received a predetermined number of pulses. In practice, the distance sensor is suitable for use with the detonator of a projectile.
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