Oscillation detection-based metal detector

Abstract

The invention discloses an oscillation detection-based metal detector. The metal detector includes a power supply circuit, an oscillation detection circuit, an audio oscillation circuit, a power amplification circuit, a filtering circuit and a voice alarm circuit; the oscillation detection circuit includes an inductor, a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a first transistor and a second transistor; one end of the inductor is connected in series with the first capacitor and the third capacitor, and then, the third capacitor is grounded; the other end of the second resistor is connected with the second capacitor, and then, the second capacitor is grounded; the other end of the second resistor is connected with the base of the first resistor; the emitter of the first resistor is connected with the collector of the second transistor; the collector of the first transistor is grounded; the base of the second transistor is connected with one end of the third resistor; the emitter of the second transistor is grounded; and the other end of the first resistor is connected with a voltage output end. The oscillation detection-based metal detector responds timely when detecting a metal object, and the practicability of the metal detector in detection can be improved.

Description

technical field [0001] The invention relates to a metal detector based on vibration detection, which belongs to the technical field of metal detection. Background technique [0002] Underground metal detectors are made with advanced technology and have the characteristics of wide detection, accurate positioning, strong resolution, and easy operation. Metal detectors are mainly used to detect and identify metal objects buried underground. In addition to its military application, it is also widely used in: security inspection, archaeology, prospecting, looking for scrap metal. Therefore, it is widely used. [0003] For technical detectors, the classification includes hand-held metal detectors, conveying split metal detectors, drop-type metal detectors, etc. And each type has a great relationship with the area, shape and weight of the metal to be detected due to the detection depth. [0004] Among them, the hand-held metal detector is designed to detect metal objects carried...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a metal detector based on oscillation detection, which solves the problem that the oscillation effect of the oscillation circuit of the existing metal detection device is poor during detection and cannot be detected sensitively. A problem that reduces the effectiveness of detection

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