FIELD: electronic equipment. SUBSTANCE: device has microwave oscillator, circulator, emitter, which is mounted in perpendicular to conveyor surface, T-joint and time delay detector. Output of microwave oscillator is connected to first arm of T-joint, which second arm is connected to input of circulator, which input-output is connected to input of emitter. Output of circulator is connected to first input of time delay detector. Third arm of T-joint is connected to second input of time delay detector, which output is designed as device output. EFFECT: increased reliability of device. 1 dwg
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