CN103353613B - Time-sharing multi-frequency metal detection machine - Google Patents
Time-sharing multi-frequency metal detection machine Download PDFInfo
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- CN103353613B CN103353613B CN201310311388.2A CN201310311388A CN103353613B CN 103353613 B CN103353613 B CN 103353613B CN 201310311388 A CN201310311388 A CN 201310311388A CN 103353613 B CN103353613 B CN 103353613B
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Abstract
The invention, which belongs to the technical field of electrical or magnetic prospecting and detection technologies, provides a time-sharing multi-frequency metal detection machine with the advantages of comprehensive detection, high detection sensitivity, and good stability. The time-sharing multi-frequency metal detection machine is composed of a control unit, a signal generation unit, a power amplification unit, a transmitting coil, a balancing receiving coil, a reception unit, a signal conditioning unit, a zero point control unit, a demodulation unit, a vector signal processing unit, and a data sampling unit. The structural key point of the detection machine is characterized in that the control unit, the signal generation unit, the power amplification unit, and the transmitting coil are successively connected; the balancing receiving coil, the reception unit, the signal conditioning unit, the zero point control unit, the demodulation unit, the vector signal processing unit, the data sampling unit, and the control unit are successively connected; and an output port of the control unit is respectively connected with input ports of the signal conditioning unit, the zero point control unit, the demodulation unit, the vector signal processing unit, and the data sampling unit.
Description
Technical field
The invention belongs to exploration or the Detection Techniques field of electric or magnetic, particularly relate to a kind of timesharing multifrequency metal detection machine.
Background technology
The metal detection system that industrial environment uses produces eddy effect based on metal at alternating magnetic field to realize detecting the metallic impurity in material; Due to the diversity of its monitored target and the complicacy of environment for use; For the metal detection system of single-frequency, because frequency of operation is single and stationarity, if cause using upper frequency in the detection, when being generally hundreds of KHz input, very responsive for non-ferromagnetic metal; But because detected object has conductive characteristic, its detection sensitivity will be affected; Simultaneously when adopting higher frequency detecting, the detection perform for ferromagnetic metal can decline, and causes ferromagnetic metal detection sensitivity to reduce.Adopt lower frequency to detect if contrary, because the metal of nonferromagnetic is insensitive for low frequency, although reduce product effect, also reduce the sensitivity of non-ferromagnetic metal simultaneously; Equipment may be caused time serious cannot to detect the metallic impurity of pollution.
Summary of the invention
The present invention is exactly for the problems referred to above, provides a kind of and detects comprehensively, detection sensitivity is high, the timesharing multifrequency metal detection machine of good stability.
For achieving the above object, the present invention adopts following technical scheme, the present invention includes control module, signal generation unit, power amplification unit, transmitting coil, balance reception coil, receiving element, signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, data sampling unit, its structural feature control module, signal generation unit, power amplification unit, transmitting coil is connected successively, balance reception coil, receiving element, signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, data sampling unit, control module is connected successively, the output port of control module respectively with signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, the input port of data sampling unit is connected, the output port of signal generation unit respectively with Zero magnitude control unit, the input port of demodulating unit is connected,
Described control module control signal generation unit produces and sends to power amplification unit according to two kinds of time sequencing change or two or more frequency signal M01;
The signal that described balance reception coil is received from transmitting coil by coupling obtains two contrary output signal F21 and F22 of amplitude equal direction;
Described receiving element forms a F3 signal after carrying out overlap-add procedure to F21 and F22;
Described Zero magnitude control unit under the control of the control unit, by after M01 and M01+90 ° of two paths of signals process inputting signal generation unit, obtain one to differ 180 degree F42C signal with signal condition element output signal F41 amplitude same phase, F41 and F42C superposition obtains F42 signal and exports to demodulating unit;
Described demodulating unit obtains signal F431 and F432 by carrying out demodulation computing from M0 ° of signal generating unit and M90 ° of two paths of signals to F42;
The simulating signal F441 carrying amplitude-phase information that described data sampling unit exports vector sensor signal processing unit and F442 is converted into digital signal to control module, and whether control module carries out metallic impurity according to signal amplitude and phase place exists and judge to produce warning message.
As a kind of preferred version, signal generation unit of the present invention comprises four DDS(Direct Digital Synthesizers) and two OP(amplifiers), the input port of four DDS is all connected with the output port of described control module, two DDS export described M0 ° and M90 ° of signal respectively, and another two DDS export described M01 and M01+90 ° signal respectively by OP.
As another kind of preferred version, Zero magnitude control unit of the present invention comprises two DA(digital to analog converters), two multipliers and two totalizers; The input end of one multiplier receives described M01+90 ° respectively and a DA outputs signal, and exports termination first adder one input end; The input end of another multiplier receives described M01 and another DA respectively and outputs signal, and exports another input end of termination first adder; First adder exports termination second adder one input end, F41 signal described in another input termination of second adder, and second adder exports described F42 signal; The input end of described two DA is all connected with control module output port.
Beneficial effect of the present invention:
Adopt timesharing to carry out multi-frequency send mode in the present invention, can be good at utilizing the feature of M01 to carry out multi-frequency time-sharing send; Make same detected object time-sharing work in different frequency environments; Thus the ability well realized detecting while ferromagnetic metal and non-ferromagnetic metal; Good raising equipment Inspection sensitivity and stability thereof.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.Scope is not only confined to the statement of following content.
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is a kind of example that signal generating unit of the present invention produces signal.
Fig. 3 is signal generating unit structural representation of the present invention.
Fig. 4 is Zero magnitude control cellular construction schematic diagram of the present invention.
In figure, 1 be power amplification unit, 2 be sensor unit, 3 be receiving element, 4 be core processing part, 41 be signal condition unit, 42 be Zero magnitude control unit, 43 be demodulating unit, 44 be vector sensor signal processing unit, 45 be data sampling unit, 46 be signal generation unit, 47 for control module.
Embodiment
As shown in the figure, the present invention includes control module, signal generation unit, power amplification unit, transmitting coil, balance reception coil, receiving element, signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, data sampling unit, control module, signal generation unit, power amplification unit, transmitting coil is connected successively, balance reception coil, receiving element, signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, data sampling unit, control module is connected successively, the output port of control module respectively with signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, the input port of data sampling unit is connected, the output port of signal generation unit respectively with Zero magnitude control unit, the input port of demodulating unit is connected,
Described control module control signal generation unit produces and sends to power amplification unit according to two kinds of time sequencing change or two or more frequency signal M01;
The signal that described balance reception coil is received from transmitting coil by coupling obtains two contrary output signal F21 and F22 of amplitude equal direction; Transmitting coil can around on the framework of a nonmetal structure, and balance reception coil is parallel with transmitting coil and be equally distributed on transmitting coil both sides;
Described receiving element forms a F3 signal after carrying out overlap-add procedure to F21 and F22;
Described Zero magnitude control unit under the control of the control unit, by after M01 and M01+90 ° of two paths of signals process inputting signal generation unit, obtain one to differ 180 degree F42C signal with signal condition element output signal F41 amplitude same phase, F41 and F42C superposition obtains F42 signal and exports to demodulating unit; Signal condition unit carries out filtering to F3 signal, amplifies process, makes F3 signal reach predetermined amplitude and degree of stability; When not having metallic impurity to enter detection instrument, F42 signal amplitude is zero or convergence zero.
Described demodulating unit obtains signal F431 and F432 by carrying out demodulation computing from M0 ° of signal generating unit and M90 ° of two paths of signals to F42; Do not have between transmitting coil and balance reception coil metallic impurity by time, its F42 amplitude is zero, therefore through demodulating unit output signal for F431 and F432 two paths of signals be zero; When sense channel has metallic impurity, because F42 signal is not 0, therefore together with F431 with F432 two paths of signals, form amplitude and the phase information of current metal signal.
The simulating signal F441 carrying amplitude-phase information that described data sampling unit exports vector sensor signal processing unit and F442 is converted into digital signal to control module, and whether control module carries out metallic impurity according to signal amplitude and phase place exists and judge to produce warning message.After vector sensor signal processing unit carries out low-pass filtering treatment and amplitude amplification process to two paths of signals F431 and F432 from demodulating unit, correspondence obtains signal F441 and F442.
Described signal generation unit comprises four DDS and two OP, the input port of four DDS is all connected with the output port of described control module, two DDS export described M0 ° and M90 ° of signal respectively, and another two DDS export described M01 and M01+90 ° signal respectively by OP.Adopt controlled four road signal M01, M01+90 ° and M0 °, the M90 ° of generation timesharing frequency change phase place that direct digital frequency synthesis technology can be real-time fast, the feature of four tunnel signal sources that signal generating unit produces is: M01, M01+90 ° and M0 °, M90 ° are have identical frequecy characteristic in each time, namely the frequency of four road signals is synchronous changes, synchronously completes the function of frequency error factor.
Signal M01 and M01+90 ° has identical amplitude characteristic, has the phase differential of 90 degree unlike two paths of signals; Signal M0 ° and M90 ° has identical amplitude characteristic, has the phase differential of 90 degree unlike two paths of signals; And the signal amplitude of M01 and M0 ° and the difference of phase place are controlled by control module, M01+90 ° is also have control module to control with the signal of M90 ° and the difference of phase place.In addition, four road signals are generated owing to have employed direct digital frequency synthesis technology, the combination of its frequency signal can form a signal generation combined cycle for arbitrary combination time-sharing send multi-frequency signal, signal is the four road signals being combined as that loop cycle produces Frequency Synchronization transmission when sending, and phase place synchronously changes with signal frequency change.
As shown in Figure 3, according to the instruction of control module, by having controlled DDS1, DDS2, DDS3, DDS4 to control respectively four output channels of signal generating unit; Achieve four road signal M01, M01+90 ° and M0 °, M90 ° synchronizing frequency switches, locking phase handoff functionality.When control module control signal generating unit carries out signal output, determine the number of times of frequency change and the time span of often kind of frequency signal transmission by control module; Setting a control cycle is T, and the time that each frequency produces is T1, T2, T3 Can need to set each frequency according to the time and have a time span, all frequency times are added together and form one-period T.Calculating for one-period T can represent as follows by formula 1.1:
Figure 2 shows that an example, it represents signal waveform example in another cycle of signal with signal generation unit generation when 3 frequencies scan.In actual applications, the time span that frequency occurs and combination of frequency order are not limited to the structure expressed by Fig. 2, and its time and frequency kind can increase and reduce or change its array mode.The feature of four road signals that signal generating unit produces: M01, M01+90 ° as first group of signal, amplitude is identical, signal phase difference 90 degree; M0 °, M90 ° as second group of signal, amplitude is identical, signal phase difference 90 degree; Between first group of signal and second group of signal, amplitude does not have direct correlation; But the phase differential of the signal between first group of signal and second group of signal is determined by control module; And need to carry out adjustment by control module according to detection feature to control.The multi-frequency switching that this method realizes achieves has carried out multi-frequency scanning fast to same detected object, make the ferromagnetic metal in detected object and non-ferromagnetic metal all have good signal response ability, improve sensitivity and the stability of detection.
Described Zero magnitude control unit comprises two DA, two multipliers and two totalizers; The input end of one multiplier receives described M01+90 ° respectively and a DA outputs signal, and exports termination first adder one input end; The input end of another multiplier receives described M01 and another DA respectively and outputs signal, and exports another input end of termination first adder; First adder exports termination second adder one input end, F41 signal described in another input termination of second adder, and second adder exports described F42 signal; The input end of described two DA is all connected with control module output port.
As shown in Figure 4, carry out multiplying by DA1 and M01+90 ° and generate signal F42A, DA2 and M01 carries out multiplying and generates signal F42B, and signal F42A is added with signal F42B and obtains F42C signal; Because signal F42C and signal F41 has same amplitude, phase 180 degree of characteristics, therefore F42C and F41 is added and obtains the signal F42 that amplitude is 0.And frequency is when switching, carried out amplitude and the phase place of control F42C by control module control DA1 and DA2 data; The F42C corresponding with signal F41 is produced when achieving frequency error factor; Signal F42 is remained on state that amplitude is zero.When there being metallic impurity to enter the inside of the receiving coil of metal detection system, due to receiving coil distribution characteristics and its principle of work, the signal of balancing coil will be caused to change, and this change can be transferred to F42 place, makes the signal amplitude of F42 be no longer zero; At this moment F42 will carry this metal signal information and be supplied to the process of next stage demodulating unit.Metal due to the window place at balance reception coil is the object of movement, so when different frequency error factor, still can produce the state making F42 signal non-vanishing, is exactly that signal has corresponding metal signal to produce always at different frequencies; After metal leaves window, under control module is to the control of Zero magnitude control unit F42 again the amplitude of getting back to be the state of 0, still can steady operation.
Two digital-to-analogue converters that control module controls Zero magnitude control unit by A46 transfer analog signals to digital quantity; The analog quantity that digital-to-analogue converter DA1 exports is D1; The analog quantity that digital-to-analogue converter DA2 exports is D2; M01 can be expressed as follows by formula 1.2:
M01=A × sin (2 π ft) ... 1.2 formula
Because M01+90 ° is 90 degree with M01 phase differential frequency is identical, amplitude is identical, therefore can represent by formula 1.3:
1.3 formula
Wherein A represents amplitude, and f represents signal frequency, and t represents the time.
Formula 1.4 and formula 1.5 can be had to represent according to F42A and F42B shown in Fig. 4:
F42A=M01 × D1=D1 × A × sin (2 π ft) ... 1.4 formula
1.5 formula
F42C can be calculated according to Fig. 4 can be represented by formula 1.6:
Equivalence 1.7 formulas can be changed to express the form of F42C signal by 1.6 formulas:
Can see that for the signal amplitude of F42C and phase place be have the amplitude of the output signal of DA1 and DA2 to control by equation set 1.7; Can generate a signal F42C by controlling Zero magnitude control unit by above equation control module, this F42C signal has with antipodal two signals of the proportional phase place of F41 amplitude.Can be analyzed by equation 1.7 mathematic(al) representation, the signal frequency of F42C has the identical signal of frequency with signal source signal M01, and just signal amplitude and phase place controlled unit are controlled by DA1 and DA2.Because the precision of DA1 and DA2 is very high, therefore can realizing generation one and F41 in the application, to have phase place completely contrary, and amplitude becomes the signal of fixed proportion, and after F42C and F41 two signals are added by totalizer, F42 signal amplitude is the function of 0.And when frequency change is carried out according to the control of control module for M01 signal, can be drawn by equation 1.7, its signal F42C can be controlled to regulate its amplitude and phase place at any time by control module, and frequency signal and M01 signal synchronously carry out; Therefore under the control of the control unit, no matter how frequency changes, and Zero magnitude control unit can complete the process to F42 signal zero; Thus the problem achieving signal zero when changing multi-frequency is well solved; Present method solves the shortcoming of the time causing signal demand to be recalibrated in different frequency error factor long poor stability.Which, by the control to the zero point of signal, makes the job stability of metal detection system and reliably obtains effective raising.
Be understandable that, above about specific descriptions of the present invention, the technical scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.
Claims (3)
1. timesharing multifrequency metal detection machine, comprise control module, signal generation unit, power amplification unit, transmitting coil, balance reception coil, receiving element, signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, data sampling unit, it is characterized in that control module, signal generation unit, power amplification unit, transmitting coil is connected successively, balance reception coil, receiving element, signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, data sampling unit, control module is connected successively, the output port of control module respectively with signal condition unit, Zero magnitude control unit, demodulating unit, vector sensor signal processing unit, the input port of data sampling unit is connected, the output port of signal generation unit respectively with Zero magnitude control unit, the input port of demodulating unit is connected,
Described control module control signal generation unit produces and sends to power amplification unit according to two kinds of time sequencing change or two or more frequency signal (M01);
The signal that described balance reception coil is received from transmitting coil by coupling obtains two contrary output signals (F21) of amplitude equal direction and (F22);
Described receiving element forms (F3) signal after carrying out overlap-add procedure to (F21) and (F22);
Described Zero magnitude control unit under the control of the control unit, by after (M01) and (M01+90 °) two paths of signals process of inputting signal generation unit, obtain one to differ 180 degree (F42C) signal with signal condition element output signal (F41) amplitude same phase, (F41) superposes with (F42C) and obtains (F42) signal and export to demodulating unit;
Described demodulating unit obtains signal (F431) and (F432) by carrying out demodulation computing from (M0 °) and (M90 °) two paths of signals of signal generating unit to (F42);
The simulating signal (F441) of carrying amplitude-phase information that described data sampling unit exports vector sensor signal processing unit and (F442) are converted into digital signal to control module, and whether control module carries out metallic impurity according to signal amplitude and phase place exists and judge to produce warning message.
2. the metal detection machine of timesharing multifrequency according to claim 1, it is characterized in that described signal generation unit comprises four (DDS) and two (OP), the input port of four (DDS) is all connected with the output port of described control module, two (DDS) exports described (M0 °) and (M90 °) signal respectively, and another two (DDS) export described (M01) and (M01+90 °) signal respectively by (OP).
3. the metal detection machine of timesharing multifrequency according to claim 1, is characterized in that described Zero magnitude control unit comprises two (DA), two multipliers and two totalizers; The input end of one multiplier receives described (M01+90 °) and one (DA) output signal respectively, exports termination first adder one input end; The input end of another multiplier receives described (M01) and another (DA) output signal respectively, exports another input end of termination first adder; First adder exports termination second adder one input end, (F41) signal described in another input termination of second adder, and second adder exports described (F42) signal; The input end of described two (DA) is all connected with control module output port.
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| CN105842741B (en) * | 2016-03-23 | 2017-12-05 | 成都恒高科技有限公司 | A kind of metal detecting device and method |
| CN106353826A (en) * | 2016-08-31 | 2017-01-25 | 上海太弘威视安防设备有限公司 | Metal detection door with multi-frequency self-balancing function |
| CN109631955A (en) * | 2018-11-27 | 2019-04-16 | 中国铁道科学研究院集团有限公司 | Surface mark sensor, detection device and system |
| CN110360458B (en) * | 2019-05-20 | 2021-04-30 | 新世纪发展集团有限公司 | Wisdom piping lane wireless thing allies oneself with system of patrolling and examining based on initiative amplitude-frequency characteristic excitation |
| CN111273587A (en) * | 2020-03-09 | 2020-06-12 | 南京从景生物技术有限公司 | Time-sharing work or continuous work control method of double-frequency pulse wearable equipment |
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