Metal detector

A metal detector and microcomputer technology, which is applied to measurement devices, geophysical measurements, radio wave measurement systems, etc., can solve the problem that the use effect is interfered by human factors, avoid repeated debugging processes, save operation time and cost, Controllable effects of suppression function
CN102298159BActive Publication Date: 2013-04-10多科智能装备(常熟)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
多科智能装备(常熟)有限公司
Publication Date
2013-04-10

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Abstract

The invention relates to a metal detector, which comprises a human-machine communication system and an OSC (Open Source Commerce) reference signal generator, wherein the human-machine communication system is connected with a signal processor; the OSC reference signal generator is connected with a waveform shaping circuit, a power amplifying circuit, an emitting coil of a detecting head, a phase calibrating circuit, an orthogonal reference adjusting circuit and a synchronous demodulating circuit in order; a receiving coil of the detecting head is connected to a differential receiving circuit, the synchronous demodulating circuit, a low-pass filtering circuit, an A / D (Analog / Digital) conversion circuit and a digital signal processor in order; and the digital signal processor is also connected to the power amplifying circuit and the differential receiving circuit. Output signals of synchronous demodulating circuit after the low-pass filtering circuit are mainly envelope signals of the differential motion output signals with varied amplitude, and are sampled into the digital signal processor after A / D conversion. The digital signal processor restrains material effect signals by adding two paths of signals, collected by the A / D conversion circuit, which are respectively multiplied by a specific coefficient.
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Description

technical field

[0001] The invention relates to a metal detector. Background technique

[0002] At present, metal detectors using general-purpose technology are implemented by analog circuits plus digital logic circuits. It is troublesome to operate control methods such as material effect suppression, and it is impossible to record the detection status. It is troublesome to replace the detection product. The actual use effect is interfered by human factors. This case uses DSP technology and algorithms to solve the above problems in a targeted manner. Contents of the invention

[0003] The object of the present invention is to provide a new type of metal foreign object detector including material effect suppression function and automatic debugging (learning function), which can automatically suppress the material effect generated by the conductivity and magnetic permeability of the detected object. The suppression method is accomplished through a DSP-based digital signal...

Claims

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