CN2694270Y - Hand-held resoluble metal detector circuit - Google Patents
Hand-held resoluble metal detector circuit Download PDFInfo
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- CN2694270Y CN2694270Y CN 200420021448 CN200420021448U CN2694270Y CN 2694270 Y CN2694270 Y CN 2694270Y CN 200420021448 CN200420021448 CN 200420021448 CN 200420021448 U CN200420021448 U CN 200420021448U CN 2694270 Y CN2694270 Y CN 2694270Y
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Abstract
The utility model relates to a hand-held resoluble metal detector circuit, comprising a receiving and an emitting coil, a head amplifier connected with the receiving coil, two multipliers connected in parallel on the output terminal of the head amplifier, two filters and amplifiers respectively connected to the output terminals of the two multipliers, and an oscillation source respectively connected with the emitting coil and a phase shifter, and the output terminal of the phase shifter is respectively connected with the input terminals of the two multipliers. The hand-held resoluble metal detector circuit is characterized in that the output terminals of the two amplifiers are connected to a digit signal control circuit whose input terminal and output terminal of the gating analog switching circuit are respectively connected with the output terminals of the two amplifiers and the input terminal of the analogue-digital conversion circuit; the input terminal and the output terminal of the SCM circuit are respectively connected with the output terminal of the analogue-digital conversion circuit and the display and sound alarm circuit. The utility model has the functions of detecting and distinguishing various metals and can display the types of the detected metal, using different alarm sounds to differentiate. The hand-held resoluble metal detector circuit is convenient in use.
Description
Technical field
The utility model relates to a kind of metal detector circuit, relates in particular to the distinguishable metal detector circuit of a kind of hand-held.
Background technology
Metal detector has a wide range of applications in the modern life, as industries such as military affairs, security personnel, capital construction, amusements, the ultimate principle of the metal detector circuit of prior art generally has eddy-current method, inductive electromagnetic method, technology such as detection of magnetic field, the design of metal detector circuit just is being based on a kind of like this thought, adopt the vortex principle that metal object produces in the alternating magnetic field, this instrument can bury on the metal object soil, but not under the condition that directly contacts, when instrument during, directly providing the indication of reporting to the police near metal object.
At present, the metal detector circuit of prior art generally adopts analog signal processing technology, survey and differentiate various metals, seeing also shown in Figure 1 is a kind of prior art metal detector circuit, it comprises: the loop A of forming by receiving coil A11 and transmitting coil A12 1, prime amplifier A2, two multiplier A31 and A32, four operational amplifier A 41, A42, A43, A44, and signal mixing knob A5, comparer A6, voice guard A7, oscillation source A8, phase shifter A9 form; The input end of prime amplifier A2 is connected with receiving coil A11 output terminal, the input end of the output terminal of prime amplifier A2 and two multiplier A31 and A32 also connects, the output terminal of two multiplier A31 and A32 respectively with operational amplifier A 41, the input end of A42 connects, the input end of the output terminal of operational amplifier A 41 and signal mixing knob A5 and the input end of operational amplifier A 43 also connect, the input end of the output terminal of operational amplifier A 42 and output terminal that number mixes knob A5 and operational amplifier A 44 also connects, the output terminal of operational amplifier A 43 and A44 is connected with the input end of comparer A6 respectively, the output terminal of comparer A6 is connected with audible alarm circuit A7, the output terminal of oscillation source A8 is connected with the input end of phase shifter A9 with transmitting coil A12 respectively, the output terminal of phase shifter A9 respectively with multiplier A31, the input end of A32 connects.
The principle of work of above-mentioned prior art metal detector circuit is, produces the transmit frequency signal of 2～10KHZ by oscillation source, the input phase shifter, and the reference signal that has certain phase differential by phase shifter output two-way is imported two multipliers respectively; Simultaneously, receive received signal from receiving coil, amplify back input multiplier through prime amplifier, the reference signal that two-way has certain phase differential multiplies each other by multiplier and received signal, multiplier output two-way has the rectified signal of phase differential, this two-way rectified signal is after amplifier amplifies, by the mixed mixed signal input comparator of signal mixing knob, compare by this mixed signal of comparer and received signal, because eddy effect and magnetic effect, different metals can produce the received signal of different phase places, sends audible alarm by voice guard.For ferromagnetic metal, this two paths of signals is anti-phase, and for non-ferromagnetic metal, this two paths of signals is a homophase.Utilize this characteristics, can carry out distinguishing of different metal,, can report to the police or suppress different metals according to the degree difference of mixing.
Prior art metal detector circuit is owing to adopt analog signal processing technology, according to the degree difference of mixing, though can report to the police or suppress different metals,, its shortcoming is, resolution characteristic to various metal is low, can not provide clear and definite demonstration indication, and the indication of reporting to the police can only audible alarm, and audible alarm is a unifrequency, can not segment the alarm sound of each metalloid, and need come the mixability of control signal, operate very inconvenient by the manual shift knob.
Summary of the invention
The purpose of this utility model is to provide a kind of improved hand-held distinguishable metal detector circuit, the mode that in this circuit, adopts Digital Signal Processing and liquid crystal display and audible alarm to combine, it can effectively improve the degree of accuracy of the various metals of resolution of metal detector, and easy to use, intuitive display.
The purpose of this utility model is achieved in that the distinguishable metal detector circuit of a kind of hand-held, comprise reception, transmitting coil, be connected the receiving coil output terminal prime amplifier, be attempted by the prime amplifier output terminal two multipliers, be connected to the multiplier output terminal two wave filters and amplifiers, be connected the transmitting coil input end oscillation source, be connected the phase shifter of oscillation source output terminal, the output terminal of this phase shifter is connected with the input end of two multipliers respectively; Be characterized in:
The output terminal of described two multipliers connects a Digital Signals circuit, and this Digital Signals circuit is made up of gating analog switching circuit, analog to digital conversion circuit, single chip circuit, audible alarm circuit, liquid crystal display circuit;
The input end of described gating analog switching circuit is connected with the output terminal of two amplifiers respectively, and its output terminal is connected with the input end of analog to digital conversion circuit;
The output terminal of described analog to digital conversion circuit is connected with the input end of single chip circuit;
The output terminal of described single chip circuit is connected with audible alarm circuit, liquid crystal display circuit respectively.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described gating analog switching circuit is made up of traffic pilot and undervoltage warning circuit, and the input end 1 of traffic pilot, end 2, end 4, end 5 are connected with the output terminal of each amplifier respectively; The output terminal 14 of traffic pilot is connected undervoltage warning circuit with output terminal 15.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described undervoltage warning circuit is made up of resistance R 45, R46, R47, R48, capacitor C 28, C29, resistance R 45 is connected in series mutually with R46, capacitor C 28 and resistance R 46 mutually and connect, this resistance R 45, R46, capacitor C 28 and contact be connected with the output terminal 14 of traffic pilot; Resistance R 47 is connected in series mutually with R48, capacitor C 29 and resistance R 46 mutually and connect, this resistance R 47, R48, capacitor C 29 and contact be connected with the output terminal 15 of traffic pilot.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described analog to digital conversion circuit is made of the A/D analog to digital converter, and the input end 2 of A/D analog to digital converter is connected with the output terminal 3 of traffic pilot.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described single chip circuit is made up of single-chip microcomputer, crystal oscillating circuit, interruption reset condition circuit; Connect crystal oscillating circuit between the signal end 18 of single-chip microcomputer and the signal end 19, the signal end 9 of single-chip microcomputer, signal end 31 is connected the interruption reset condition circuit with signal end 39, the control signal end 5 of single-chip microcomputer, 6,7 with the control end 11 of traffic pilot, 10,9 corresponding connections, the input end 1 of single-chip microcomputer, 3,2 with the output terminal 7 of A/D analog to digital converter, 6,5 corresponding connections, the output terminal 21 of single-chip microcomputer to output terminal 28 and output terminal 32 to output terminal 38 respectively with the input end 1 to 8 and input end 9 to 11 and 17 to 20 corresponding connections of input end of LCD, the output terminal 39 of single-chip microcomputer connects the audible alarm circuit.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described crystal oscillating circuit is made up of crystal oscillator and capacitor C 31,30, one end of crystal oscillator and the signal end 18 of single-chip microcomputer and capacitor C 30 1 ends also connect, the other end of crystal oscillator and the signal end of single-chip microcomputer 19 and capacitor C 31 1 ends also connect, and capacitor C 30 other ends are connected with capacitor C 31 other ends.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described this interruption reset condition circuit is made up of resistance R 52, R56, R63, capacitor C 32, the two ends of resistance R 52 respectively with the reset terminal 9 of single-chip microcomputer and power supply digitally VSS2 be connected; The two ends of resistance R 56 are connected with the output terminal 39 of single-chip microcomputer and the middle-end signal end 31 of single-chip microcomputer respectively, and capacitor C 32 is attempted by between the middle-end signal end 31 and reset terminal 9 of single-chip microcomputer.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described audible alarm circuit is made up of loudspeaker warning circuit and earphone warning circuit and web member J2; The input end of loudspeaker warning circuit is connected with the port one of web member J2, and the input end of earphone warning circuit is connected with the output terminal of single-chip microcomputer 39.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described loudspeaker warning circuit is made up of triode V3, V4, V5, resistance R 62, R66, capacitor C 46; Be connected in series a resistance R 62 between the port one of the base stage of triode V3 and web member J2, the emitter of triode V3 is connected with the base stage of triode V4, one input end of the collector of triode V3 and V4 and loudspeaker also connects, be connected in series a resistance R 66 between the base stage of triode V5 and capacitor C 46 negative terminals, another input end of the collector of triode V5 and capacitor C 46 anodes and loudspeaker also connects.
The distinguishable metal detector circuit of above-mentioned hand-held, wherein, described earphone warning circuit is made up of operational amplifier N11A, diode V2, resistance R 57 to resistance R 61, capacitor C 33; Series resistor R57 and capacitor C 33 between the input end 3 of operational amplifier N11A and the output terminal 39 of single-chip microcomputer, diode V2 anode and resistance R 58 1 ends are connected to resistance R 57 two ends, the other end of diode V2 negative terminal and resistance R 58 and power supply simulation ground VSS1 also connect, series resistor R59 between the port 2 of operational amplifier N11A and the power supply simulation ground VSS1, series resistor R60 between the port 2 of operational amplifier N11A and the output terminal 1, series resistor R61 between the output terminal 1 of operational amplifier N11A and the port 2 of web member J2.
The distinguishable metal detector circuit of the utility model hand-held makes it compared with prior art owing to adopted above-mentioned technical scheme, has following advantage and good effect:
1, the utility model is owing to be provided with the Digital Signals circuit in metal detector, behind received signal preposition amplification of process and the signal demodulator, through amplifying once more, signal is imported the gating analog switch, after the A/D analog to digital conversion, form digital signal, entering single-chip microcomputer handles, single-chip microcomputer carries out carrying out instant computing after digital filtering is handled to this digital signal, analyzes comparison according to built-in database, thereby judges the kind that is detected metal exactly.
2, the utility model is owing to adopted the mode of liquid crystal display and audible alarm, and the kind of metal is visited in instant playback, and is distinguished with different alarm sounds, has improved the hommization at interface.
3, the utility model is owing to adopted singlechip technology, and we can also change software according to client's demand, and the warning or the inhibition of dissimilar metals are provided, and reach the detection requirement of particular customer.
Description of drawings
By the description of a following embodiment to the utility model (denomination of invention), can further understand the purpose of this utility model, specific structural features and advantage in conjunction with its accompanying drawing.Wherein, accompanying drawing is:
Fig. 1 is a prior art metal detector circuit block diagram.
Fig. 2 is the distinguishable metal detector circuit block diagram of the utility model hand-held.
Fig. 3 is the distinguishable metal detector circuit theory diagrams of the utility model hand-held.
Embodiment
Seeing also Fig. 2 described is the distinguishable metal detector circuit block diagram of the utility model hand-held, the distinguishable metal detector circuit of hand-held comprises: receiving coil 11, transmitting coil 12, prime amplifier 2, two multipliers 31,32, two wave filters 41,42, two groups of amplifiers 51,52, oscillation source 6, phase shifter 7, the Digital Signals circuit of forming by gating analog switching circuit 81, analog to digital conversion circuit 82, single chip circuit 83, liquid crystal display circuit 84, audible alarm circuit 85 8.The input end of prime amplifier 2 is connected with the receiving coil output terminal, the output terminal of prime amplifier 2 and two multipliers 31,32 input end connects, wave filter 41 is serially connected between the input end of multiplier 31 output terminals and one group of amplifier 51, wave filter 42 is serially connected between the input end of multiplier 32 output terminals and another group amplifier 52, two groups of amplifiers 51,52 output terminal is connected with each input end of gating analog switching circuit 81 in the Digital Signals circuit 8 respectively, the output terminal of gating analog switching circuit 81 is connected with the input end of analog to digital conversion circuit 82, the output terminal of analog to digital conversion circuit 82 is connected with the input end of single chip circuit 83, and the output terminal of single chip circuit 83 is connected with the input end of liquid crystal display circuit 84 and the input end of sound warning circuit 85 respectively; The output terminal of oscillation source 6 is connected with the input end of transmitting coil 12 with phase shifter 7 respectively, and the output terminal of phase device 7 is connected with the input end of multiplier 31,32 respectively.
The utility model amplifies through prime amplifier 2 by receiving coil 11 received signals, input multiplier 31,32, with the signal multiplication of exporting through phase shifter 7 by oscillation source 6 outputs, the output two-way has the rectified signal of phase differential, this two paths of signals passes through wave filter 41 respectively, 42 filtering, through operational amplifier 51,52 amplify once more, gating mimic channel 81 with signal supplied with digital signal control circuit 8, through analog to digital conversion circuit 82, form digital signal, entering single chip circuit 83 handles, single-chip microcomputer N10 carries out each metalloid data of database that the digital filtering processing is back and single-chip microcomputer N10 is built-in to this digital signal and analyzes comparison, after the instant computing, by the mode of liquid crystal display audible alarm, the kind of metal is visited in instant playback, and is distinguished warning with different sound.
Seeing also shown in Figure 3 is the distinguishable metal detector circuit theory diagrams of the utility model hand-held, the prime amplifier 2 of the distinguishable metal detector circuit of hand-held is made up of operational amplifier (model is OP27) N1, resistance R 1, R2, capacitor C 1, C2, C3, the input end 3 of operational amplifier N1 is connected with capacitor C 1 with receiving coil 11, between the end 2 of operational amplifier N1 and the output terminal 6 and connecting resistance R2 and capacitor C 3, series resistor R1 and capacitor C 2 successively between capacitor C 3 one ends and ground.
Multiplier 31 is made up of four bidirectional analog switches (model is CD4066BZ) N2B, resistance R 3, capacitor C 4, is connected in series capacitor C 4, resistance R 3 successively between the input end 11 of four bidirectional analog switch N2B and the output terminal 6 of operational amplifier N1.Multiplier 32 is made up of four bidirectional analog switches (model is CD4066BZ) N2D, resistance R 16, R17, capacitor C 13, C14, be connected in series capacitor C 13, C14, resistance R 17 successively between the input end 8 of four bidirectional analog switch N2D and the output terminal 6 of operational amplifier N1, between the contact of capacitor C 13 and capacitor C 14 and ground, be connected resistance R 16.
Wave filter 41 is made up of resistance R 4, R5, capacitor C 5, C6, resistance R 4 and resistance R 5 are serially connected between the input end 6 of the output terminal 10 of four bidirectional analog switch N2B and operational amplifier N3B mutually, capacitor C 5 is connected between resistance R 4 and R5 contact and the ground, and capacitor C 6 is connected between resistance R 5 other ends and the ground.Wave filter 42 is made up of resistance R 18, R19, capacitor C 15, C16, resistance R 18 and R19 are serially connected between the input end 9 of the output terminal 9 of four bidirectional analog switch N2D and operational amplifier N3C mutually, capacitor C 15 is connected between the also contact and ground of resistance R 18 and R19, and capacitor C 16 is connected between resistance R 19 other ends and the ground.
One group of amplifier 51 is made up of operational amplifier (model is LM324) N3A, N3B, operational amplifier (model is TLC272) N4A, N4B, resistance R 6 to resistance R 15, capacitor C 7 to C12; Between the input end 6 of operational amplifier N3B and the output terminal 7 and connecting resistance R6 and capacitor C 7, series resistor R7 between the output terminal 7 of operational amplifier N3B and the input end 2 of operational amplifier N3A; Between the input end 2 of operational amplifier N3A and the output terminal 1 and connecting resistance R9 and capacitor C 8, be connected in series capacitor C 9 between the series resistor R8 between the anode 3 of operational amplifier N3A and the ground, the output terminal 1 of operational amplifier N3A and the input end 5 of operational amplifier N4B; Between the negative terminal 6 of operational amplifier N4B and the output terminal 7 and connect connecting resistance R11 and capacitor C 10, be connected resistance R 10 between the input end 5 of operational amplifier N4B and the ground, be connected resistance R 12 between the negative terminal 6 of operational amplifier N4B and the ground; Be connected in series capacitor C 11 between the input end 3 of operational amplifier N4A and the output terminal 1 of operational amplifier N3A, be connected resistance R 13 between the input end 3 of operational amplifier N4A and the ground, between the negative terminal 2 of operational amplifier N4A and the output terminal of operational amplifier N4A and connecting resistance R15 and capacitor C 12, be connected resistance R 14 between the negative terminal 2 of operational amplifier N4A and the ground.
Another group amplifier 52 is by being made up of operational amplifier (model is LM324) N3C, N3D, operational amplifier (model is TLC272) N5A, N5B, resistance R 20 to resistance R 29, capacitor C 15 to C22; Between the input end 9 of operational amplifier N3C and the output terminal 8 and connecting resistance R20 and capacitor C 17, series resistor R21 between the output terminal 8 of operational amplifier N3C and the input end 13 of operational amplifier N3D; Between the input end 13 of operational amplifier N3D and the output terminal 14 and connect and connecting resistance R23 and capacitor C 18, be connected in series capacitor C 19 between the output terminal 14 of operational amplifier N3D and the input end 5 of operational amplifier N5B, series resistor R24 between the input end 5 of operational amplifier N5B and the ground, between the negative terminal 6 of operational amplifier N5B and the output terminal 7 and connecting resistance R26 and capacitor C 20, be connected resistance R 25 between the negative terminal 6 of operational amplifier N5B and the ground; Be connected in series capacitor C 21 between the input end 3 of operational amplifier N5A and the output terminal 14 of operational amplifier N3D, series resistor R27 between the input end 3 of operational amplifier N5A and the ground, between the negative terminal 2 of operational amplifier N5A and the output terminal 1 and connecting resistance R29 and capacitor C 22, be connected resistance R 28 between the negative terminal 2 of operational amplifier N5A and the ground.
Oscillation source 6 is made up of two-way differential comparator (model is LM239) N6B, Schmidt trigger (CD4093BZ) N7A, four bidirectional analog switches (model is CD4066BZ) N2A, triode V1, resistance R 30, R31, R32, R36, R37, R38, R43, R44, capacitor C 23, C27; Two-way differential comparator N6B output terminal 1 is connected with the input end 1,2 of Schmidt trigger N7A, is connected resistance R 37 between two-way differential comparator N6B input end 7 and the ground, is connected resistance R 36 between two-way differential comparator N6B output terminal 1 and the 6 volts of power supply VCC; Schmidt trigger N7A output terminal 3 is connected with the port one 3 of four bidirectional analog switch N2A; The port one 2 of four bidirectional analog switch N2A is connected with the base stage of triode V1, is connected capacitor C 27 between the port one of four bidirectional analog switch N2A and the simulation ground VSS1; The collector of triode V1 is connected with transmitting coil 12, series resistor R30, R31 between the collector of triode V1 and the simulation ground VSS, between the contact of resistance R 30 and R31 and resistance R 32 1 ends, be connected in series capacitor C 23, resistance R 32 other ends are connected with ground, are connected resistance R 43 between the emitter of triode V1 and the simulation ground VSS1.
Phase shifter 7 is by two-way differential comparator (LM239) N6C, N6D, potentiometer RP1, RP2, resistance R 33, R34, R35, R39, R40, R41, R42, capacitor C 24, C26; Be connected in series a potentiometer RP1 between the input end 9 of two-way differential comparator N6C and the capacitor C 23 of oscillation source 6, be connected capacitor C 24 between the input end 9 of two-way differential comparator N6C and the ground, the negative terminal 8 of two-way differential comparator N6C and resistance R 33 and R34 one end also connect, the port one 3 of the other end of resistance R 34 and Schmidt trigger N7A output terminal 3 and four bidirectional analog switch N2A also connects, be connected resistance R 35 between the output terminal 14 of two-way differential comparator N6C and the 6 volts of power supply VCC, the output terminal 14 of two-way differential comparator N6C is connected with the control end 12 of four bidirectional analog switch N2B; Be connected in series a potentiometer RP2 between the input end 10 of two-way differential comparator N6D and the resistance R 38 of oscillation source 6, be connected capacitor C 26 between the input end 10 of two-way differential comparator N6D and the ground, two-way differential comparator N6D anode 11 and resistance R 40 and R41 one end also connect, resistance R 39 is serially connected in the other end of capacitor C 25 with the resistance R 40 of oscillation source 6, two-way differential comparator N6D output terminal 13 with control end 6 and resistance R 42 1 ends of four bidirectional analog switch N2D and connect.
Digital Signals circuit 8 in the distinguishable metal detector circuit of hand-held is made up of gating analog switching circuit 81, analog to digital conversion circuit 82, single chip circuit 83, liquid crystal display circuit 84, audible alarm circuit 85.Gating analog switching circuit 81 is made up of traffic pilot (model is 4051) N8 and undervoltage warning circuit 811, the input end 5 of traffic pilot N8, the end 4,1, the end 2 respectively with operational amplifier N4A output terminal 1, N4B output terminal 7, N5A output terminal 1, the 7 corresponding connections of N5B output terminal; Undervoltage warning circuit 811 is made up of resistance R 45, R46, R47, R48, capacitor C 28, C29, resistance R 45 is connected in series mutually with R46, capacitor C 28 and resistance R 46 mutually and connect, this resistance R 45, R46, capacitor C 28 and contact be connected with the output terminal 14 of traffic pilot N8; Resistance R 47 is connected in series mutually with R48, capacitor C 29 and resistance R 46 mutually and connect, this resistance R 47, R48, capacitor C 29 and contact be connected with the output terminal 15 of traffic pilot N8.When the operating voltage of gating analog switching circuit 81 is lower than normal value, undervoltage warning circuit 811 is just reported to the police.
Analog to digital conversion circuit 82 is made of A/D analog to digital converter (model is TLC548) N9, and the input end 2 of A/D analog to digital converter N9 is connected with the output terminal 3 of traffic pilot N8, and this analog to digital conversion circuit 82 is a digital signal with the analog signal conversion that receives.
Single chip circuit 83 is made up of single-chip microcomputer (model is 89C52) N10, crystal oscillating circuit 831, interruption reset condition circuit 832; Connect crystal oscillating circuit 831 between the signal end 18 of single-chip microcomputer N10 and the signal end 19, crystal oscillating circuit 831 is made up of crystal oscillator JZ1 and capacitor C 31,30, one end of crystal oscillator and the signal end 18 of single-chip microcomputer N10 and capacitor C 30 1 ends also connect, the signal end 19 of the other end of crystal oscillator JZ1 and single-chip microcomputer N10 and capacitor C 31 1 ends also connect, and capacitor C 30 other ends and capacitor C 31 other ends and VSS2 are digitally mutually and connect; The signal end 9 of single-chip microcomputer N10, signal end 31 and signal end 39 connect interruption reset condition circuit 832, this interruption reset condition circuit is made up of resistance R 52, R56, R63, capacitor C 32, and the two ends of resistance R 52 digitally are connected with VSS2 with the reset terminal 9 of single-chip microcomputer N10 respectively; The two ends of resistance R 56 are connected with the output terminal 39 of single-chip microcomputer N10 and the look-at-me end 31 of single-chip microcomputer N10 respectively, and the look-at-me end 31 of single-chip microcomputer N10 is connected with 5 volts of power vd D, and capacitor C 32 is attempted by between the look-at-me end 31 and reset terminal 9 of single-chip microcomputer; The control signal 5,6,7 of single-chip microcomputer N10 and 11,10, the 9 corresponding connections of the control end of traffic pilot N8, the input end 1,3,2 of single-chip microcomputer N10 and 7,6, the 5 corresponding connections of the output terminal of A/D analog to digital converter N9, the output terminal 21 of single-chip microcomputer N10 to output terminal 28 and output terminal 32 to output terminal 38 respectively with the input end 1 to 8 and input end 9 to 11 and 17 to 20 corresponding connections of input end of LCD 84, the output terminal 39 of single-chip microcomputer N10 connects audible alarm circuit 85.Adopted high performance single-chip microcomputer in the distinguishable metal detector circuit, the metallicity signal offers single-chip microcomputer after amplifier amplifies, single-chip microcomputer carries out overall treatment to two paths of signals, enlargement factor and alarm threshold by resonance-amplifier, make detector be in optimum Working all the time, to improve the sensitivity of its intelligent distinguishable metal detector, owing to gordian techniquies such as gating analog switching circuit that has adopted multi-channel data acquisition and analog to digital conversion circuits, reached target has accurately been located, on software design, by using alert program, the sampling processing timing control program is to the accuracy of signal identification.We can also change software according to client's demand, and the warning or the inhibition of dissimilar metals are provided, and reach the detection requirement of particular customer.
Audible alarm circuit 85 is made up of loudspeaker warning circuit 851 and earphone warning circuit 852 and web member J2; Loudspeaker warning circuit 851 is made up of triode V3, V4, V5, resistance R 62, R66, capacitor C 46; Be connected in series a resistance R 62 between the port one of the base stage of triode V3 and web member J2, the emitter of triode V3 is connected with the base stage of triode V4, one input end of the collector of triode V3 and V4 and loudspeaker also connects, be connected in series a resistance R 66 between the base stage of triode V5 and capacitor C 46 negative terminals, another input end of the collector of triode V5 and capacitor C 46 anodes and loudspeaker also connects; Earphone warning circuit 852 is made up of operational amplifier N11A, diode V2, resistance R 57 to resistance R 61, capacitor C 33; Series resistor R57 and capacitor C 33 between the input end 3 of operational amplifier N11A and the output terminal 39 of single-chip microcomputer N10, diode V2 anode and resistance R 58 1 ends are connected to resistance R 57 two ends, the other end of diode V2 negative terminal and resistance R 58 and VSS1 simulation ground also connect, series resistor R59 between the port 2 of operational amplifier N11A and the VSS1 simulation ground, series resistor R60 between the port 2 of operational amplifier N11A and the output terminal 1, series resistor R61 between the output terminal 1 of operational amplifier N11A and the port 2 of web member J2.On the alarm indication mode, adopted the liquid crystal instant playback to be visited the kind of metal, and distinguished with different alarm sounds, report to the police and the earphone warning by speaker sound, improved the hommization at interface.
The principle of work of the distinguishable metal detector circuit of the utility model hand-held is, by receiving coil input received signal received signal process prime amplifier N1, after the amplification, input multiplier N2B N2D and the signal multiplication of exporting through phase shifter 7 by oscillation source 6 outputs, the output two-way has the rectified signal of phase differential, this two paths of signals passes through wave filter 41 respectively, 42 filtering, after the classification of operational amplifier N4 and N5 is amplified, gating analog switch N8 with signal supplied with digital signal control circuit 8, through entering gating analog switch N8, the signal that each operational amplifier of gating of constantly sampling is exported, import the A/D analog to digital converter again, is digital signal through the A/D analog to digital converter with analog signal conversion, final input single-chip microcomputer N10, after data are carried out digital filtering and mathematics manipulation, extract the amplitude and the phase information of metal target, with the data of gathering handle with single-chip microcomputer in the data of storing compare, and effectively distinguish ferromagnetic metal and non-ferromagnetic metal in view of the above, finally judge the character of the metal of visiting, just provide alerting signal if be consistent, show the kind and the related data of metal again by LCD JI by loudspeaker and earphone.In actual detection several data with obvious phase characteristic are stored (or carrying out collection in worksite), normal data is abundanter in the database, and result of detection is just more accurate, and range of application is also wider.
The utility model is used for hunting for treasure on the sandy beach, to burying coin and the gold necklace in the sandy beach, during precious metal things such as gold finger-ring, can carry out dynamic instrumentation, find target, target is done further more accurate localization, can carry out static instrumentation again, can accurately differentiate the metal of unlike material, the interference that can remove ferromagnetic metals such as pin, iron nail, reinforcing bar simultaneously.For example the data after the optimization process have been carried out in the differentiation of American coin and be located in the single-chip microcomputer, thereby judged the kind of American coin exactly, reached the purpose that to distinguish fully.
In sum, the utlity model has and survey the function of differentiating each metalloid, have stronger pressing down Ability processed and higher detectivity, it not only can survey metal target, and can judge various The metalline of metal target effectively raises the comprehensive survey performance of metal detector, show and It is directly perceived, easy to use to report to the police.
Claims (10)
1. distinguishable metal detector circuit of hand-held, this circuit comprises reception, transmitting coil, be connected the prime amplifier of receiving coil output terminal, be attempted by the prime amplifier output terminal two multipliers, be connected to the multiplier output terminal two wave filters and amplifiers, be connected the transmitting coil input end oscillation source, be connected the phase shifter of oscillation source output terminal, the output terminal of this phase shifter is connected with the input end of two multipliers respectively; It is characterized in that:
The output terminal of described two multipliers connects a Digital Signals circuit, and this Digital Signals circuit is made up of gating analog switching circuit, analog to digital conversion circuit, single chip circuit, audible alarm circuit, liquid crystal display circuit;
The input end of described gating analog switching circuit is connected with the output terminal of two amplifiers respectively, and its output terminal is connected with the input end of analog to digital conversion circuit;
The output terminal of described analog to digital conversion circuit is connected with the input end of single chip circuit;
The output terminal of described single chip circuit is connected with audible alarm circuit, liquid crystal display circuit respectively.
2, according to the distinguishable metal detector circuit of the described hand-held of claim claim 1, it is characterized in that: described gating analog switching circuit is made up of traffic pilot and undervoltage warning circuit, and the input end 1 of traffic pilot, end 2, end 4, end 5 are connected with the output terminal of each amplifier respectively; The output terminal 14 of traffic pilot is connected undervoltage warning circuit with output terminal 15.
3, according to the distinguishable metal detector circuit of the described hand-held of claim claim 2, it is characterized in that: described undervoltage warning circuit is made up of resistance R 45, R46, R47, R48, capacitor C 28, C29, resistance R 45 is connected in series mutually with R46, capacitor C 28 and resistance R 46 mutually and connect, this resistance R 45, R46, capacitor C 28 and contact be connected with the output terminal 14 of traffic pilot; Resistance R 47 is connected in series mutually with R48, capacitor C 29 and resistance R 46 mutually and connect, this resistance R 47, R48, capacitor C 29 and contact be connected with the output terminal 15 of traffic pilot.
4, according to the distinguishable metal detector circuit of the described hand-held of claim claim 1, it is characterized in that: described analog to digital conversion circuit is made of the A/D analog to digital converter, and the input end 2 of A/D analog to digital converter is connected with the output terminal 3 of traffic pilot.
5, according to the distinguishable metal detector circuit of the described hand-held of claim claim 1, it is characterized in that: described single chip circuit is made up of single-chip microcomputer, crystal oscillating circuit, interruption reset condition circuit; Connect crystal oscillating circuit between the signal end 18 of single-chip microcomputer and the signal end 19, the signal end 9 of single-chip microcomputer, signal end 31 is connected the interruption reset condition circuit with signal end 39, the control signal end 5 of single-chip microcomputer, 6,7 with the control end 11 of traffic pilot, 10,9 corresponding connections, the input end 1 of single-chip microcomputer, 3,2 with the output terminal 7 of A/D analog to digital converter, 6,5 corresponding connections, the output terminal 21 of single-chip microcomputer to output terminal 28 and output terminal 32 to output terminal 38 respectively with the input end 1 to 8 and input end 9 to 11 and 17 to 20 corresponding connections of input end of LCD, the output terminal 39 of single-chip microcomputer connects the audible alarm circuit.
6, according to the distinguishable metal detector circuit of the described hand-held of claim claim 5, it is characterized in that: described crystal oscillating circuit is made up of crystal oscillator and capacitor C 31,30, one end of crystal oscillator and the signal end 18 of single-chip microcomputer and capacitor C 30 1 ends also connect, the other end of crystal oscillator and the signal end of single-chip microcomputer 19 and capacitor C 31 1 ends also connect, and capacitor C 30 other ends are connected with capacitor C 31 other ends.
7, according to the distinguishable metal detector circuit of the described hand-held of claim claim 5, it is characterized in that: described this interruption reset condition circuit is made up of resistance R 52, R56, R63, capacitor C 32, the two ends of resistance R 52 respectively with the reset terminal 9 of single-chip microcomputer and power supply digitally VSS2 be connected; The two ends of resistance R 56 are connected with the output terminal 39 of single-chip microcomputer and the middle-end signal end 31 of single-chip microcomputer respectively, and capacitor C 32 is attempted by between the middle-end signal end 31 and reset terminal 9 of single-chip microcomputer.
8, according to the distinguishable metal detector circuit of the described hand-held of claim claim 1, it is characterized in that: described audible alarm circuit is made up of loudspeaker warning circuit and earphone warning circuit and web member J2; The input end of loudspeaker warning circuit is connected with the port one of web member J2, and the input end of earphone warning circuit is connected with the output terminal of single-chip microcomputer 39.
9, according to the distinguishable metal detector circuit of the described hand-held of claim claim 8, it is characterized in that: described loudspeaker warning circuit is made up of triode V3, V4, V5, resistance R 62, R66, capacitor C 46; Be connected in series a resistance R 62 between the port one of the base stage of triode V3 and web member J2, the emitter of triode V3 is connected with the base stage of triode V4, one input end of the collector of triode V3 and V4 and loudspeaker also connects, be connected in series a resistance R 66 between the base stage of triode V5 and capacitor C 46 negative terminals, another input end of the collector of triode V5 and capacitor C 46 anodes and loudspeaker also connects.
10, according to the distinguishable metal detector circuit of the described hand-held of claim claim 8, it is characterized in that: described earphone warning circuit is made up of operational amplifier N11A, diode V2, resistance R 57 to resistance R 61, capacitor C 33; Series resistor R57 and capacitor C 33 between the input end 3 of operational amplifier N11A and the output terminal 39 of single-chip microcomputer, diode V2 anode and resistance R 58 1 ends are connected to resistance R 57 two ends, the other end of diode V2 negative terminal and resistance R 58 and power supply simulation ground VSS1 also connect, series resistor R59 between the port 2 of operational amplifier N11A and the power supply simulation ground VSS1, series resistor R60 between the port 2 of operational amplifier N11A and the output terminal 1, series resistor R61 between the output terminal 1 of operational amplifier N11A and the port 2 of web member J2.
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| CN 200420021448 CN2694270Y (en) | 2004-03-31 | 2004-03-31 | Hand-held resoluble metal detector circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200420021448 CN2694270Y (en) | 2004-03-31 | 2004-03-31 | Hand-held resoluble metal detector circuit |
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| CN2694270Y true CN2694270Y (en) | 2005-04-20 |
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| CN 200420021448 Expired - Fee Related CN2694270Y (en) | 2004-03-31 | 2004-03-31 | Hand-held resoluble metal detector circuit |
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| CN103424779A (en) * | 2012-05-24 | 2013-12-04 | 金华马卡科技有限公司 | Handheld detecting instrument |
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| CN105866846A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Hand-held iron weapon detector |
| CN105866858B (en) * | 2016-03-25 | 2018-11-30 | 东莞市华盾电子科技有限公司 | Scaling method, test method and its system of mobile phone detection |
| CN105866176A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Calibration method, test method and system of metal classified detection |
| CN105866858A (en) * | 2016-03-25 | 2016-08-17 | 东莞市华盾电子科技有限公司 | Calibrating method, testing method for mobile phone detecting and system thereof |
| CN105911602A (en) * | 2016-05-03 | 2016-08-31 | 东莞市华盾电子科技有限公司 | Metal classification image display method and device |
| CN105911893A (en) * | 2016-06-02 | 2016-08-31 | 齐宽宽 | Damping-type intelligent center control |
| CN105842739A (en) * | 2016-06-15 | 2016-08-10 | 大同市快安科技有限公司 | Passing-through type specific metal detecting door |
| CN105842739B (en) * | 2016-06-15 | 2020-06-09 | 大同市快安科技有限公司 | Passing type specific metal detection door |
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