CN203324489U - Time-sharing and multi-frequency metal detection machine - Google Patents
Time-sharing and multi-frequency metal detection machine Download PDFInfo
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- CN203324489U CN203324489U CN2013204482447U CN201320448244U CN203324489U CN 203324489 U CN203324489 U CN 203324489U CN 2013204482447 U CN2013204482447 U CN 2013204482447U CN 201320448244 U CN201320448244 U CN 201320448244U CN 203324489 U CN203324489 U CN 203324489U
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Abstract
The utility model belongs to the technical field of electric or magnetic exploration or detection, and provides a time-sharing and multi-frequency metal detection machine which is comprehensive in detection, high in detection sensitivity and great in stability. The time-sharing and multi-frequency metal detection machine comprises a control unit, a signal generating unit, a power amplifying unit, a transmitting coil, a balance receiving coil, a receiving 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 points of the time-sharing and multi-frequency metal detection machine are that the control unit, the signal generating unit, the power amplifying unit and the transmitting coil are connected in turn. The balance receiving coil, the receiving 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 connected in turn. The output port of the control unit is respectively connected with the 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 utility model belongs to exploration or the Detection Techniques field of electric or magnetic, relates in particular to a kind of timesharing multifrequency metal detection machine.
Background technology
The metal detection system that industrial environment is used is based on the metallic impurity of metal in alternating magnetic field generation eddy effect realizes detecting 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 detection, while being generally hundreds of KHz input, very responsive for non-ferromagnetic metal; But, because detected object has conductive characteristic, will affect its detection sensitivity; Simultaneously when adopting higher frequency detecting, for the detection performance of ferromagnetic metal, can descend, cause the ferromagnetic metal detection sensitivity to reduce.If contrary, adopt lower frequency to be detected, because the metal of nonferromagnetic is insensitive for low frequency, although reduced product effect, also reduced the sensitivity of non-ferromagnetic metal simultaneously; When serious, may cause equipment can't detect the metallic impurity of pollution.
Summary of the invention
The utility model 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 utility model adopts following technical scheme, the utility model comprises control module, the signal generation unit, power amplification unit, transmitting coil, the balance receiving coil, receiving element, the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the data sampling unit, its structural feature control module, the signal generation unit, power amplification unit, transmitting coil is connected successively, the balance receiving coil, receiving element, the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the data sampling unit, control module is connected successively, the output port of control module respectively with the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the input port of data sampling unit is connected, the output port of signal generation unit respectively with the control module at zero point, the input port of demodulating unit is connected,
Described control module control signal generation unit produces according to two kinds of time sequencing variation or two or more frequency signal M01 and sends to power amplification unit;
Described balance receiving coil receives signal from transmitting coil by coupling and obtains two output signal F21 and the F22 that the amplitude equal direction is contrary;
Described receiving element carries out forming a F3 signal after overlap-add procedure to F21 and F22;
Described zero point, control module was under the control of control module, after processing by the M01 to the input of signal generation unit and M01+90 ° of two paths of signals, obtain one and differ the F42C signal of 180 degree with signal condition element output signal F41 amplitude same phase, F41 and F42C stack obtain the F42 signal and export to demodulating unit;
Described demodulating unit carries out demodulation computing with M90 ° of two paths of signals to F42 by the M0 from signal generating unit ° and obtains signal F431 and F432;
Described data sampling unit is converted into digital signal to the simulating signal F441 that carries amplitude-phase information and the F442 of vector signal processing unit output to control module, and whether control module carries out metallic impurity according to signal amplitude and phase place and exist judgement to produce warning message.
As a kind of preferred version, signal generation unit described in the utility model comprises four DDS(Direct Digital Synthesizers) and two OP(amplifiers), the input port of four DDS all is connected with the output port of described control module, two DDS export respectively described M0 ° and M90 ° of signal, and another two DDS export described M01 and M01+90 ° of signal by OP respectively.
As another kind of preferred version, zero point described in the utility model, control module comprised two DA(digital to analog converters), two multipliers and two totalizers; The input end of one multiplier receives respectively described M01+90 ° and a DA output signal, output termination first adder one input end; The input end of another multiplier receives respectively described M01 and another DA output signal, another input end of output termination first adder; First adder output termination second adder one input end, the described F41 signal of another input termination of second adder, second adder is exported described F42 signal; The input end of described two DA all is connected with the control module output port.
The utility model beneficial effect:
In the utility model, adopt timesharing to carry out the multi-frequency send mode, can be good at utilizing the feature of M01 to carry out multi-frequency timesharing transmission; Make same detected object time-sharing work in different frequency environments; Thereby the ability detected when well realizing ferromagnetic metal and non-ferromagnetic metal; Well improve equipment Inspection sensitivity and stability thereof.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described further.The utility model protection domain not only is confined to the statement of following content.
Fig. 1 is the utility model schematic block circuit diagram.
Fig. 2 is a kind of example that the utility model signal generating unit produces signal.
Fig. 3 is the utility model signal generating unit structural representation.
Fig. 4 is the utility model control module at zero point structural representation.
In figure, 1 be power amplification unit, 2 for sensor unit, 3 for receiving element, 4 for core processing part, 41 for the signal condition unit, 42 for zero point control module, 43 for demodulating unit, 44 for the vector signal processing unit, 45 for the data sampling unit, 46 for signal generation unit, 47 be control module.
Embodiment
As shown in the figure, the utility model comprises control module, the signal generation unit, power amplification unit, transmitting coil, the balance receiving coil, receiving element, the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the data sampling unit, control module, the signal generation unit, power amplification unit, transmitting coil is connected successively, the balance receiving coil, receiving element, the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the data sampling unit, control module is connected successively, the output port of control module respectively with the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the input port of data sampling unit is connected, the output port of signal generation unit respectively with the control module at zero point, the input port of demodulating unit is connected,
Described control module control signal generation unit produces according to two kinds of time sequencing variation or two or more frequency signal M01 and sends to power amplification unit;
Described balance receiving coil receives signal from transmitting coil by coupling and obtains two output signal F21 and the F22 that the amplitude equal direction is contrary; Transmitting coil can be on the framework of a nonmetal structure, and the balance receiving coil is parallel with transmitting coil and be equally distributed on the transmitting coil both sides;
Described receiving element carries out forming a F3 signal after overlap-add procedure to F21 and F22;
Described zero point, control module was under the control of control module, after processing by the M01 to the input of signal generation unit and M01+90 ° of two paths of signals, obtain one and differ the F42C signal of 180 degree with signal condition element output signal F41 amplitude same phase, F41 and F42C stack obtain the F42 signal and export to demodulating unit; The signal condition unit carries out filtering, amplifies and process the F3 signal, makes the F3 signal reach predetermined amplitude and degree of stability; When not having metallic impurity to enter detection instrument, the F42 signal amplitude is zero or convergence zero.
Described demodulating unit carries out demodulation computing with M90 ° of two paths of signals to F42 by the M0 from signal generating unit ° and obtains signal F431 and F432; When between transmitting coil and balance receiving coil, not having metallic impurity to pass through, its F42 amplitude is zero, through the demodulating unit output signal, is therefore that F431 and F432 two paths of signals are zero; When sense channel has metallic impurity, because the F42 signal is not 0, so F431 forms amplitude and the phase information of current metal signal together with the F432 two paths of signals.
Described data sampling unit is converted into digital signal to the simulating signal F441 that carries amplitude-phase information and the F442 of vector signal processing unit output to control module, and whether control module carries out metallic impurity according to signal amplitude and phase place and exist judgement to produce warning message.The vector signal processing unit carries out after low-pass filtering treatment and amplitude amplify and process the two paths of signals F431 from demodulating unit and F432, and correspondence obtains signal F441 and F442.
Described signal generation unit comprises four DDS and two OP, the input port of four DDS all is connected with the output port of described control module, two DDS export respectively described M0 ° and M90 ° of signal, and another two DDS export described M01 and M01+90 ° of signal by OP respectively.Adopt four road signal M01, M01+90 ° controlled 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 the four tunnel signal sources that signal generating unit produces is: M01, M01+90 ° and M0 °, M90 ° are to have identical frequecy characteristic in each time, the frequency of four road signals is synchronous variations, synchronously completes the function of frequency switching.
Signal M01 and M01+90 ° have identical amplitude characteristic, and different is the phase differential that two paths of signals has 90 degree; Signal M0 ° and M90 ° has identical amplitude characteristic, and different is the phase differential that two paths of signals has 90 degree; And the difference of the signal amplitude of M01 and M0 ° and phase place is to be controlled by control module, M01+90 ° is also to have control module to control with the signal of M90 ° and the difference of phase place.In addition, owing to having adopted direct digital frequency synthesis technology to generate four road signals, the combination of its frequency signal can form a signal generation combined cycle for the timesharing of random combine mode sends the multi-frequency signal, signal is four road signals that are combined as the transmission of loop cycle generation Frequency Synchronization while sending, and phase place synchronously changes with the signal frequency change.
As shown in Figure 3, according to the instruction of control module, by DDS1, DDS2, DDS3, DDS4 have been controlled, four output channels of signal generating unit are controlled respectively; Four road signal M01, M01+90 ° and M0 °, M90 ° synchronizing frequency switching, locking phase handoff functionality have been realized.When control module control signal generating unit carries out signal output, determined number of times and every kind of time span that frequency signal sends of frequency change 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 mean as follows by formula 1.1:
Figure 2 shows that an example, the signal that when its expression has 3 frequencies and scanned, the signal generation unit produces signal waveform example in another cycle.In actual applications, time span and combination of frequency that frequency occurs sequentially are not limited to the expressed structure of Fig. 2, and its time and frequency kind can increase and reduce or change its array mode.The feature of the four road signals that signal generating unit produces: M01, M01+90 ° as first group of signal, and amplitude is identical, and signal phase differs 90 degree; M0 °, M90 are ° as second group of signal, and amplitude is identical, and signal phase differs 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 adjust control by control module according to detected characteristics.The multi-frequency switching that this method realizes has realized same detected object has been carried out to multi-frequency scanning fast, make ferromagnetic metal and non-ferromagnetic metal in detected object all there is good signal response ability, improved the sensitivity and the stability that detect.
Described zero point, control module comprised two DA, two multipliers and two totalizers; The input end of one multiplier receives respectively described M01+90 ° and a DA output signal, output termination first adder one input end; The input end of another multiplier receives respectively described M01 and another DA output signal, another input end of output termination first adder; First adder output termination second adder one input end, the described F41 signal of another input termination of second adder, second adder is exported described F42 signal; The input end of described two DA all is connected with the control module output port.
As shown in Figure 4, carry out multiplying by DA1 and M01+90 ° and generate signal F42A, DA2 and M01 carry out multiplying generation signal F42B, and signal F42A and signal F42B addition obtain the F42C signal; Because signal F42C and signal F41 have same amplitude, phase phasic difference 180 degree characteristics, so F42C and F41 addition obtain the signal F42 that amplitude is 0.And frequency is while being switched, by control module, control amplitude and the phase place that DA1 and DA2 data are controlled F42C; Produce the F42C corresponding with signal F41 while having realized the frequency switching; Make signal F42 remain on the state that amplitude is zero.When having metallic impurity to enter the inside of receiving coil of metal detection system, due to receiving coil distribution characteristics and its principle of work, will cause the signal of balancing coil to change, this variation can be transferred to F42 place, and the signal amplitude that makes F42 is no longer zero; At this moment F42 will carry this metal signal information and offer the processing of next stage demodulating unit.Due to the object of metal for moving at the window place at the balance receiving coil, so, when different frequency switchings, still can produce the state that makes the F42 signal non-vanishing, be exactly that signal has corresponding metal signal to produce always under different frequencies; After metal leaves window, control module to the control of control module at zero point under the F42 state that the amplitude of getting back to is 0 again, still can steady operation.
Two digital-to-analogue converters that control module is controlled the control module at zero point by A46 transfer digital quantity to analog signals; The analog quantity of digital-to-analogue converter DA1 output is D1; The analog quantity of digital-to-analogue converter DA2 output is D2; M01 can be expressed as follows by formula 1.2:
M01=A * sin (2 π ft) ... 1.2 formula
Due to M01+90 ° with the M01 phase differential, be that 90 degree frequencies are identical, amplitude is identical, therefore can mean by formula 1.3:
Wherein A means amplitude, and f means signal frequency, and t means the time.
According to F42A shown in Fig. 4 and F42B, can have formula 1.4 and formula 1.5 to mean:
F42A=M01 * D1=D1 * A * sin (2 π ft) ... 1.4 formula
Can calculate F42C according to Fig. 4 can be meaned by formula 1.6:
Can equivalence be changed to the form that 1.7 formulas are expressed the F42C signal by 1.6 formulas:
Can see that by the equation set 1.7 of signal amplitude and phase place to(for) F42C are to have the amplitude of the output signal of DA1 and DA2 to control; Can be by controlling a signal F42C of control module generation at zero point by above equation control module, this F42C signal has with antipodal two signals of the proportional phase place of F41 amplitude.By equation 1.7 mathematic(al) representations, can be analyzed, the signal frequency of F42C has with signal source signal M01 the signal that frequency is identical, 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 in application, realize that one of generation and F41 have phase place fully contrary, amplitude becomes the signal of fixed proportion, make two signals of F42C and F41 by the totalizer addition after the F42 signal amplitude function that is 0.And while for the M01 signal, according to the control of control module, carrying out frequency change, by equation 1.7, can be drawn, its signal F42C can be controlled by control module regulate its amplitude and phase place at any time, and frequency signal is synchronizeed with the M01 signal and is carried out; Therefore under the control of control module, no matter how frequency changes, and zero point, control module can complete the processing that the F42 signal is made zero; Thereby the problem that while having realized multi-frequency is changed, signal makes zero is well solved; This method has solved the shortcoming that causes the long poor stability of time of signal demand recalibration in different frequency switchings.This mode, by the control at the zero point to signal, makes the job stability of metal detection system and has reliably obtained effective raising.
Be understandable that, above about specific descriptions of the present utility model, only for being described, the utility model not is limited to the described technical scheme of the utility model embodiment, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the utility model, to reach identical technique effect; Use needs as long as meet, all within protection domain of the present utility model.
Claims (3)
1. timesharing multifrequency metal detection machine, comprise control module, the signal generation unit, power amplification unit, transmitting coil, the balance receiving coil, receiving element, the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the data sampling unit, it is characterized in that control module, the signal generation unit, power amplification unit, transmitting coil is connected successively, the balance receiving coil, receiving element, the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the data sampling unit, control module is connected successively, the output port of control module respectively with the signal condition unit, zero point control module, demodulating unit, the vector signal processing unit, the input port of data sampling unit is connected, the output port of signal generation unit respectively with the control module at zero point, the input port of demodulating unit is connected,
Described control module control signal generation unit produces according to two kinds of time sequencing variation or two or more frequency signal M01 and sends to power amplification unit;
Described balance receiving coil receives signal from transmitting coil by coupling and obtains two output signal F21 and the F22 that the amplitude equal direction is contrary;
Described receiving element carries out forming a F3 signal after overlap-add procedure to F21 and F22;
Described zero point, control module was under the control of control module, after processing by the M01 to the input of signal generation unit and M01+90 ° of two paths of signals, obtain one and differ the F42C signal of 180 degree with signal condition element output signal F41 amplitude same phase, F41 and F42C stack obtain the F42 signal and export to demodulating unit;
Described demodulating unit carries out demodulation computing with M90 ° of two paths of signals to F42 by the M0 from signal generating unit ° and obtains signal F431 and F432;
Described data sampling unit is converted into digital signal to the simulating signal F441 that carries amplitude-phase information and the F442 of vector signal processing unit output to control module, and whether control module carries out metallic impurity according to signal amplitude and phase place and exist judgement 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 all is connected with the output port of described control module, two DDS export respectively described M0 ° and M90 ° of signal, and another two DDS export described M01 and M01+90 ° of signal by OP respectively.
3. the metal detection machine of timesharing multifrequency according to claim 1, is characterized in that described zero point, control module comprised two DA, two multipliers and two totalizers; The input end of one multiplier receives respectively described M01+90 ° and a DA output signal, output termination first adder one input end; The input end of another multiplier receives respectively described M01 and another DA output signal, another input end of output termination first adder; First adder output termination second adder one input end, the described F41 signal of another input termination of second adder, second adder is exported described F42 signal; The input end of described two DA all is connected with the control module output port.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353613A (en) * | 2013-07-23 | 2013-10-16 | 沈阳斯达特电子科技有限公司 | Time-sharing multi-frequency metal detection machine |
| CN106574908A (en) * | 2014-05-23 | 2017-04-19 | 格尔德·赖梅 | Method for determining at least one physical parameter using a sensor unit |
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2013
- 2013-07-23 CN CN2013204482447U patent/CN203324489U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353613A (en) * | 2013-07-23 | 2013-10-16 | 沈阳斯达特电子科技有限公司 | Time-sharing multi-frequency metal detection machine |
| CN103353613B (en) * | 2013-07-23 | 2015-07-15 | 沈阳斯达特电子科技有限公司 | Time-sharing multi-frequency metal detection machine |
| CN106574908A (en) * | 2014-05-23 | 2017-04-19 | 格尔德·赖梅 | Method for determining at least one physical parameter using a sensor unit |
| CN106574908B (en) * | 2014-05-23 | 2019-07-30 | 格尔德·赖梅 | Method for determining at least one physical parameter by sensor unit |
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