CN101968551A - Portable metal detecting device - Google Patents
Portable metal detecting device Download PDFInfo
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- CN101968551A CN101968551A CN 201010265983 CN201010265983A CN101968551A CN 101968551 A CN101968551 A CN 101968551A CN 201010265983 CN201010265983 CN 201010265983 CN 201010265983 A CN201010265983 A CN 201010265983A CN 101968551 A CN101968551 A CN 101968551A
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Abstract
The invention belongs to the field of an electronic technology and an electrician technology and relates to a portable metal detecting device. The device comprises an inductor (probe), an oscillator, a resistance-capacitance amplifier, an oscillating signal detector, a direct current amplifier, a detecting display, a power supply filter and a power supply indicating circuit, wherein the oscillator adopts a three-point type capacitance oscillating circuit, and an oscillating signal is detected by adopting a double-voltage rectifying circuit. The oscillating circuit is in a critical state; when a metal object is close to the probe, an electromagnetic field generated in an inductance coil induces eddy in the metal object to be detected; energy loss is derived from the oscillating circuit; and the consumption in the oscillating circuit is improved, an inductance coil Q value is reduced, and the oscillating circuit in the critical state stops working, thereby controlling a light-emitting diode in the circuit to be turned off. The invention can solve the common problem of detection of the metal object which is more shallowly buried relatively (such as cables concealed in the wall) and overcome the defects of complex operation, high cost, and the like existing in a large metal detecting instrument.
Description
Technical field
The invention belongs to electronic technology, electrical technology field, relate to a kind of potable metal sniffer, be mainly used in the detection operations zone and whether bury metal object, avoid bringing harm to relevant electromechanical equipment.
Background technology
The various instruments that are used for surveying metal object specially are of a great variety on the market, powerful large-scale metal detection equipment can be used for detecting 5m whether keeping metals such as gun, dagger in interior human body, luggage, the parcel, and this class detection instrument is applicable to that public arenas such as airport, station, harbour, customs, public security, frontier defense fast and safely check luggage and articles or human body; Also being useful on to survey has outside metal shell or the metal parts, be used for surveying hidden in wall electric wire, be embedded in underground water pipe or cable, even can be used in underground hunt for treasure or survey be imbedded in the underground metal object that reaches 5m deeply.Their common feature is powerful, detection range (the subsurface investigation degree of depth is big) far away, and result of detection is reliable, accurate.Though these metal detection equipment results of use are fine, ubiquity price height, problem such as be difficult to popularize.For solving the daily detection problem that runs into relatively simple metal object, be necessary to study that a kind of circuit structure is simple, dependable performance, daily easy to use, make cheap metal detecting device, to remedy the defective that exists and the deficiency of large-scale metal detection equipment.
Summary of the invention
Goal of the invention: the present invention can solve and remedy the shortcomings and deficiencies that large-scale metal detection equipment exists for solving the daily relatively simple metal detection problem that runs into.
Technical scheme: the potable metal sniffer is made up of inductor (probe), bikini electric capacity oscillatory circuit, rc-coupled amplification circuit, oscillator signal detecting circuit, dc amplification circuit, detection display circuit, electric source filter circuit, power indicating circuit etc.It is characterized in that: oscillator adopts bikini electric capacity oscillatory circuit, and the oscillator signal detecting circuit adopts two voltage doubling rectifying circuit.
The circuit working principle: the major part in the metal detecting device circuit is an oscillator that is in critical conditions, as metal object during near inductor L (that is: the probe of sniffer), the electromagnetic field that produces in the telefault will induce eddy current in tested metal object, this energy source is equivalent to increase in the circuit loss in the loss of oscillatory circuit itself.If when having metal object and telefault L very near, the loss in the circuit further strengthens, telefault (L) Q value reduces, and make the oscillatory circuit that is in the threshold oscillation state quit work, and then light emitting diode (D3) extinguishes in the control circuit.
Silicon triode in circuit (BG1) has constituted a bikini oscillator with inductor coil (L) and two electric capacity (C1, C2) of periphery.When the base stage of silicon triode in the pierce circuit (BG1) has a positive signal, be negative because the acting in opposition of triode makes the collector signal of its silicon triode (BG1).The signal polarity at the two ends of two electric capacity (C1, C2) is negative just down on all being, signal is by the feedback of electric capacity (C3), signal on silicon triode (BG1) base stage and original signal same-phase, owing to be positive feedback, so circuit can produce vibration, after inserting resistance (R1) and potentiometer (RP1),, be used for the critical conditions that control circuit is in starting of oscillation just with having weakened the intensity of the positive feedback signal in the circuit.
The oscillation frequency of metal detecting device is about 40KHz, and oscillation frequency is mainly by inductor (L), two electric capacity (C1, C2) decision.The size of regulator potentiometer RP1 energy Control and Feedback signal, control circuit is in starting of oscillation state just.Resistance (R2) is the biasing resistor of silicon triode (BG1).Faint oscillator signal is delivered to by silicon triode (BG2), two resistance (R4, R5) and electric capacity (C5) etc. by coupling capacitance (C4) and is formed voltage amplifier.Because of the signal amplitude after amplifying still smaller, form two voltage doubling rectifying circuit so select two diodes (D1, D2) and two electric capacity (C5, C6) for use, DC voltage behind the rectifying and wave-filtering makes silicon triode (BG3) conducting, at this moment the collector of silicon triode (BG3) is in low level, makes light emitting diode (D3) get electric being lighted.
When the inductor of metal detecting device probe (L) during near metal object, be in the oscillatory circuit failure of oscillation immediately of vibration critical conditions, signal by coupling capacitance (C4) will disappear, the base stage of silicon triode (BG3) can not get forward voltage, and silicon triode (BG3) is ended, light emitting diode (D3) is extinguished by lighting to become.
The circuit composition of potable metal sniffer and the annexation of main element
The present invention is made up of inductor (probe), bikini electric capacity oscillatory circuit, rc-coupled amplification circuit, two voltage doubling rectifying circuit, dc amplification circuit, detection display circuit, electric source filter circuit, power indicating circuit.
1. probe and bikini electric capacity oscillatory circuit are made up of inductor (L), oscillator electric capacity (C1, C2), biasing resistor (R2), oscillator signal damping resistance (R1, RP1), silicon triode (BG1) and resistance (R3) respectively.Two electric capacity (C1, C2) the serial connection back joins with the left end of resistance (R1), two electric capacity (C1, C2) the other end connects the two ends of telefault (L) respectively, the right-hand member of damping resistance (R1) connects the left end of potentiometer (RP1), the left end of electric capacity (C3) respectively with electric capacity (C1), the upper end of inductor (L) joins, the right-hand member of electric capacity (C3) respectively with the base stage of silicon triode (BG1), the lower end of resistance (R2) links to each other, the collector of the upper end of resistance (R2) and silicon triode (BG1) is with connecing positive source (VCC), the emitter of silicon triode (BG1) connects the right-hand member of potentiometer (RP1) respectively, the upper end of the left end of coupling capacitance (C4) and resistance (R3), the equal connection circuit ground, lower end of the other end of resistance (R3) and electric capacity (C2).
2. rc-coupled amplification circuit is made up of coupling capacitance (C4), biasing resistor (R4), silicon triode (BG2) and pull-up resistor (R5).
3. the voltage-doubler rectification filtering circuit is made up of coupling capacitance (C5), detector diode (D1, D2) and filter capacitor (C6).The collector of silicon triode (BG2) connects the left end of electric capacity (C5), the other end of electric capacity (C5) connects the negative pole of detector diode (D1) and the positive pole of detector diode (D2) respectively, the negative pole of detector diode (D2) connects the base stage of the positive pole and the silicon triode (BG3) of electrochemical capacitor (C6) respectively, the equal connection circuit of the negative pole ground of the positive pole of detector diode (D1) and electrochemical capacitor (C6).
4. dc amplification circuit is made up of the resistance (R6) on silicon triode (BG3) and the load circuit, light emitting diode (D3).
5. surveying display circuit is made up of the dropping resistor (R6) and the red light emitting diodes (D3) that are serially connected in silicon triode (BG3) collector load.
Beneficial effect: the present invention can solve daily run into bury relatively shallow metal object detection problem (as: surveying the metal pipe line of dark row in wall etc.), defective and deficiency such as remedy large-scale metal detection equipment ubiquity complicated operation, cost an arm and a leg.Fairly simple because of the circuit of potable metal sniffer, cost of manufacture is lower, be well suited for carrying out batch exploitation as a kind of common tool.
Description of drawings
Fig. 1 is a potable metal sniffer circuit working schematic diagram.
Fig. 2 is magnetic core and a coil baffle plate synoptic diagram of making the metal detecting device probe.
Fig. 3 is inductor coil (probe) design sketch of making band intermediate frequency magnetic core, and the concrete method for making of inductor coil sees the explanation in following examples for details.
Embodiment
Accompanying drawing and description of drawings to specifications are further described and illustrate relative production technology of the present invention with the following Examples below.
The selection of components and parts and making
1. for the sensitivity that improves electric circuit inspection and the stability of circuit working, the enlargement factor of silicon triode pipe (BG1) should not be too big, and the β value preferably is controlled at 70～90 for well.
2. two electric capacity (C1, C2) in the bikini oscillator circuit require selection work stability ceramic disc capacitor or select leaded multilayer ceramic capacitor for use preferably, require the capacity parameter of two electric capacity (C1, C2) to equate.
3. components and parts title and technical parameter table
| Element number | The components and parts title | Technical parameter | Quantity | Remarks | |
| BG1 | Plastic packaging N type triode | ?2CS9014、β70～90 | 1 | ||
| BG2、BG3 | Plastic packaging N type triode | ?2CS9014、β≥200 | 2 | ||
| D1、D2 | Detector diode | Glassivation 1N4148 | 2 | Switching diode | |
| D3 | Highlighted red light emitting diodes | ?Φ5、LED | 1 | Survey indication | |
| D4 | Green LED | ?Φ5、LED | 1 | The power supply indication | |
| L | | Φ | 10 intermediate frequency magnetic cores, 300 circles | 1 | Or select finished product for use |
| RP1 | Potentiometer | ?5.1KΩ | 1 | ||
| R1、R3 | Resistance | ?1/8W、3.3KΩ | 2 | ||
| R2 | Resistance | ?1/8W、680KΩ | 1 | Biasing resistor | |
| R4 | Resistance | ?1/8W、2MΩ | 1 | Biasing resistor | |
| R5 | Resistance | ?1/8W、6.8KΩ | 1 | Pull-up resistor | |
| Element number | The components and parts title | Technical parameter | Quantity | Remarks | |
| R6 | Resistance | 1/8W、100Ω | 1 | Dropping resistor | |
| R7 | Resistance | 1/8W、240Ω | 1 | Dropping resistor | |
| C1、C2、C3 | Electric capacity | Ceramic disc capacitor, 0.01 μ F | 3 | Oscillator electric capacity | |
| C4、C5 | Electric capacity | Electric capacity of the dacron, 0.22 μ F | 2 | Coupling capacitance |
| C6 | Electrochemical capacitor | 2.2 μ F/10V filter capacitor | 1 | Capacity is unsuitable big |
| C7 | Electrochemical capacitor | 470μF/10V | 1 | Filter capacitor |
| SW | Power switch | 1 |
4. the inductor in the metal detecting device (probe) is a key element, and it is a telefault that has the intermediate frequency magnetic core.Φ 10 magnetic cores are selected the antenna bar magnet in the transistor radio for use, intercept long 15mm, with insulcrete or thick 2 diameters of bakelite paperboard of 1.5mm baffle plate that is 20mm, respectively dig the concentric circle holes of a Φ 10mm in the middle of the baffle plate, be nested in the two ends of Φ 10 magnetic cores then with glue, the telefault magnetic core skeleton of making is seen shown in the Figure of description 2.Enameled wire with Φ 0.31 is flat around 300 circles at magnetic core skeleton higher slice, uses the resin glue sealing at last.Also can select for use an apparent size big and be vertical inductor on " worker " font magnetic core, the finished product inductor of inductance value 〉=6.8mH requires the wire circle of inductor many more, the coil resistance is the smaller the better simultaneously.
Circuit production
Handle the pin leads of used components and parts clean before the assembling welding, and plate scolding tin, contrast accompanying drawing 1 metal detecting device circuit working schematic diagram, successively resistance, electric capacity, diode, triode, light emitting diode, trimmer potentiometer etc. are welded on the circuit board, again inductor probe, battery folder, power switch are connected on the circuit board.
Accompanying drawing 1 circuit working schematic diagram to specifications, the welding correctness and the welding quality of all components and parts in the scrutiny circuit confirm that the welding of this device can enter the debug phase after errorless.
Circuit debugging
After connecting the 3V power supply, the descending slow adjustment of the resistance of trimmer potentiometer (RP1) is till light emitting diode (D3) is lighted.With the arbitrary end face of a metal object near probe (inductor L) magnetic core, at this moment light emitting diode will extinguish then.
Adjust the sensitivity that trimmer potentiometer (RP1) can change metal detecting device, the equal cisco unity malfunction of the excessive or too small circuit of the resistance of trimmer potentiometer (RP1).If the resistance of potentiometer (RP1) is adjusted correctly, the detection range of the probe in the circuit can reach more than the 26mm, and the probe on the circuit can detect the coin or the metal object of placing under the carpet across carpet.
Attention: the probe of metal detecting device requires away from more than the circuit elements device 55mm, and the circuit of metal detecting device can not use metal shell.The probe (inductor L) of metal detecting device can be guided to outside the shell in case of necessity, and be managed to use nonmetallic materials to pop one's head in and fixed.
Claims (4)
1. a potable metal sniffer is made up of inductor (probe), oscillator, capacitance-resistance amplification, oscillator signal detection, direct current amplification, detection demonstration, power filter, power indicating circuit, it is characterized in that oscillator adopts bikini electric capacity oscillatory circuit, two voltage doubling rectifying circuit is adopted in the oscillator signal detection.
2. potable metal sniffer according to claim 1, it is characterized in that bikini electric capacity oscillatory circuit is by telefault (L), two electric capacity (C1 of oscillator, C2), biasing resistor (R2), oscillator signal damping resistance (R1) and potentiometer (RP1), silicon triode (BG1) and resistance (R3) are formed, electric capacity (C1) is connected in series back and resistance (R1) with electric capacity (C2) left end joins, two electric capacity (C1, C2) the other end connects the two ends of telefault (L) respectively, the right-hand member of resistance (R1) connects the left end of potentiometer (RP1), the left end of electric capacity (C3) connects electric capacity (C1) respectively, the upper end of telefault (L), the right-hand member of electric capacity (C3) connects the base stage of silicon triode (BG1) and the lower end of resistance (R2) respectively, the collector of the upper end of resistance (R2) and silicon triode (BG1) is with connecing positive source (VCC), the emitter of silicon triode (BG1) connects the right-hand member of potentiometer (RP1) respectively, the left end of coupling capacitance (C4), the upper end of resistance (R3), the lower end of the other end of resistance (R3) and electric capacity (C2) and the lower end of telefault (L) are with connection circuit ground.
3. potable metal sniffer according to claim 1, it is characterized in that two multiplication of voltage detection filter circuits are by coupling capacitance (C5), two detector diode (D1, D2) and electrochemical capacitor (C6) form, the left end of electric capacity (C5) connects the collector of silicon triode (BG2), the right-hand member of electric capacity (C5) connects the negative pole of detector diode (D1) and the positive pole of detector diode (D2) respectively, the negative pole of detector diode (D2) connects the base stage of the positive pole and the silicon triode (BG3) of electrochemical capacitor (C6) respectively, and the negative pole of the positive pole of detector diode (D1) and electrochemical capacitor (C6) is with connection circuit ground.
4. potable metal sniffer according to claim 1, it is characterized in that surveying display circuit is made up of dropping resistor (R6) and red light emitting diodes (D3) the load of silicon triode (BG3) collector, the last termination positive source (VCC) of dropping resistor (R6), the positive pole of the following termination red light emitting diodes (D3) of resistance (R6), the negative pole of red light emitting diodes (D3) connects the collector of silicon triode (BG3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010265983 CN101968551A (en) | 2010-08-26 | 2010-08-26 | Portable metal detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010265983 CN101968551A (en) | 2010-08-26 | 2010-08-26 | Portable metal detecting device |
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| CN101968551A true CN101968551A (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010265983 Pending CN101968551A (en) | 2010-08-26 | 2010-08-26 | Portable metal detecting device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937722A (en) * | 2012-10-29 | 2013-02-20 | 陶燕清 | Metal proximity sensor |
| CN103233644A (en) * | 2013-04-01 | 2013-08-07 | 刘喆 | Induction-type automatic door control switch |
| CN103558640A (en) * | 2013-11-10 | 2014-02-05 | 吴建堂 | Security check channel metal detecting device |
| CN108413991A (en) * | 2018-02-12 | 2018-08-17 | 深圳市建讯电子有限公司 | The close detection method and device of wire coil/plate during electromagnetic transmission |
| CN108438647A (en) * | 2018-04-20 | 2018-08-24 | 西安航空学院 | A kind of Electromgnetic seat dustbin |
| CN109270580A (en) * | 2018-11-19 | 2019-01-25 | 永州市诺方舟电子科技有限公司 | One kind is chargeable, sensitivity is adjustable, highly sensitive hand-held metal detector |
| CN109395335A (en) * | 2019-01-02 | 2019-03-01 | 上海融体信息科技有限公司 | A kind of shared basketball can recognize anti-exchange |
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| CN2062408U (en) * | 1989-06-17 | 1990-09-19 | 项砚冬 | Shortsightedness prevention desk lamp |
| CN2893823Y (en) * | 2006-02-16 | 2007-04-25 | 张宇 | Capacitance sensing demonstration device |
| CN101408569A (en) * | 2008-11-28 | 2009-04-15 | 清华大学 | Oscillating circuit for detecting tiny plane coil inductance |
| CN201286088Y (en) * | 2008-07-31 | 2009-08-05 | 苏州银河龙芯科技有限公司 | Microampere stage ultra-low power consumption finger-simulated inductive switch circuit |
| CN201852950U (en) * | 2010-08-26 | 2011-06-01 | 刘家发 | Portable metal detection device |
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| CN87201926U (en) * | 1987-02-11 | 1988-03-23 | 中国人民解放军海军工程学院 | Metal induction electronic switch |
| CN2062408U (en) * | 1989-06-17 | 1990-09-19 | 项砚冬 | Shortsightedness prevention desk lamp |
| CN2893823Y (en) * | 2006-02-16 | 2007-04-25 | 张宇 | Capacitance sensing demonstration device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937722A (en) * | 2012-10-29 | 2013-02-20 | 陶燕清 | Metal proximity sensor |
| CN102937722B (en) * | 2012-10-29 | 2016-05-04 | 陶燕清 | Metal approach sensor |
| CN103233644A (en) * | 2013-04-01 | 2013-08-07 | 刘喆 | Induction-type automatic door control switch |
| CN103558640A (en) * | 2013-11-10 | 2014-02-05 | 吴建堂 | Security check channel metal detecting device |
| CN108413991A (en) * | 2018-02-12 | 2018-08-17 | 深圳市建讯电子有限公司 | The close detection method and device of wire coil/plate during electromagnetic transmission |
| CN108413991B (en) * | 2018-02-12 | 2020-11-06 | 深圳市建讯电子有限公司 | Method and device for detecting proximity of metal coil/plate in electromagnetic wave transmission process |
| CN108438647A (en) * | 2018-04-20 | 2018-08-24 | 西安航空学院 | A kind of Electromgnetic seat dustbin |
| CN108438647B (en) * | 2018-04-20 | 2023-12-19 | 西安航空学院 | Electromagnetic safety garbage can |
| CN109270580A (en) * | 2018-11-19 | 2019-01-25 | 永州市诺方舟电子科技有限公司 | One kind is chargeable, sensitivity is adjustable, highly sensitive hand-held metal detector |
| CN109395335A (en) * | 2019-01-02 | 2019-03-01 | 上海融体信息科技有限公司 | A kind of shared basketball can recognize anti-exchange |
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Application publication date: 20110209 |