CN102495380A - Digital signal locking type spatial magnetic field detecting system - Google Patents
Digital signal locking type spatial magnetic field detecting system Download PDFInfo
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- CN102495380A CN102495380A CN2011104130053A CN201110413005A CN102495380A CN 102495380 A CN102495380 A CN 102495380A CN 2011104130053 A CN2011104130053 A CN 2011104130053A CN 201110413005 A CN201110413005 A CN 201110413005A CN 102495380 A CN102495380 A CN 102495380A
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Abstract
The invention discloses a digital signal locking type spatial magnetic field detecting system, which is composed of an air core coil, a spatial magnetic field signal prefabricating unit, a prefabricating signal generator and a digital locking signal processing unit. The air core coil enables magnetic field signals to be converted into voltage signals which are transmitted to the spatial magnetic field signal prefabricating unit which transmits the signals to the digital locking signal processing unit, the digital locking signal processing unit timely adjusts the spatial magnetic field signal prefabricating unit and the prefabricating signal generator according to signal characteristics so as to form a signal closed loop feedback structure, the digital locking signal processing unit receives and calculates spatial magnetic field signals and prefabricating signals, the spatial magnetic field signals and the prefabricating signals are displayed on a liquid crystal display, a digital/analog converter is driven simultaneously, and analog voltage signals which are proportional to the spatial magnetic field signals are timely output. The digital signal locking type spatial magnetic field detecting system is mature in technique and high in reliability.
Description
Technical field
The invention belongs to space magnetic field detection technique field, particularly relate to a kind of space magnetic field detection system that is locked as characteristic with digital signal.
Background technology
When power distribution network generation singlephase earth fault, in order to realize the accurate location of line fault point, people obtain the characteristic information of faulty line through the formed space magnetic field of electric current in the detection failure circuit, thereby judge the abort situation of circuit.In this FLT, accurately obtain the formed space magnetic field information of electric current, be one of core technology of fault location.Existing space magnetic field detection technology is, induces the space magnetic field signal through air core coil, and signal is input in the wave filter, carries out the detection of signal amplitude then through mimic channel, is shown to then on charactron or the LCD.Yet; Not enough below this technology exists: (1) employed wave filter can only be to being that the signal of a frequency band at center carries out filtering or extracts with certain center frequency point; This frequency band is difficult to accomplish the measurement to certain frequency signal generally than broad, is difficult to improve the localization of fault precision like this; (2) use the signal amplitude mimic channel can only carry out signal amplitude detection, information such as needed phase place and frequency in the input can not be provided; (3) employed testing circuit is a mimic channel, can not carry out signal FFT and calculate, and is not easy to the further analysis of signal; (4) employed testing circuit can only be realized the demonstration of signal amplitude, can not output to miscellaneous equipment and write down and analyze.
Summary of the invention
The objective of the invention is to overcome the deficiency on the prior art; A kind of space magnetic field detecting device that is locked as characteristic with digital signal is provided; Realization is to the multiband of space magnetic field and the signal measurement of multifrequency point; Metrical information shows in real time, and with the form of analog quantity the space magnetic field information of measuring is outputed in the miscellaneous equipment.
The following technical scheme of the concrete employing of the present invention.
The locking-typed space magnetic field detection system of a kind of digital signal comprises air core coil 12, space magnetic field signal prefabricated unit 11, prefabricated signal generator 9 and number lock signal processing unit 10, it is characterized by:
Through the space magnetic field signal of said air core coil 12 sense faults circuits, said space magnetic field signal is input in the space magnetic field signal prefabricated unit 11, to said space magnetic field signal amplify, Filtering Processing;
Through 11 pairs of said space magnetic field signals of said space magnetic field signal prefabricated unit amplify, filtered output signal inputs in the number lock signal processing unit 10;
Said prefabricated signal generator 9 produces amplitude, phase place and frequency sine wave, square wave or the triangular wave of programming Control in real time; Steering order according to 10 outputs of number lock signal processing unit; Prefabricated signal generator 9 generates the square wave of the determined amplitude of steering order, phase place and frequency, sinusoidal wave or triangular wave in real time, and the signal that this generated is inputed to said number lock signal processing unit 10;
Number lock signal processing unit 10 is exported steering order respectively in space magnetic field signal prefabricated unit 11 and prefabricated signal generator 9 according to the frequency and the amplitude Characteristics of said space magnetic field signal; Adjust channel filtering frequency in the space magnetic field signal prefabricated unit 11 in real time; And amplitude, phase place and the frequency of prefabricated signal generator 9 square wave that generates, sine wave or triangular wave, constitute signal close-loop feedback structure;
The amplitude and the phase place of the said space magnetic field signal that said number lock signal processing unit 10 calculates according to said space magnetic field signal and prefabricated signal, and with the proportional analog voltage signal of said space magnetic field signal amplitude; And on LCD 8, show said result of calculation, drive digital/analog converter 7 simultaneously, output and the proportional analog voltage signal of said space magnetic field signal.
The locking-typed space magnetic field detection system of digital signal adopts handheld structure, utilizes powered battery.
Compared with prior art, advantage of the present invention is following:
(1) through space magnetic field signal prefabricated unit and prefabricated signal generator and the locking of central processing unit formation digital signal, can realize any frequency of space magnetic field and the input of any frequency range.
(2) through central processing unit and space magnetic field signal prefabricated unit, can carry out numerical evaluation, realize that amplitude, phase place, frequency and the FFT to signal calculates the signal that is collected.
(3) through central processing unit and digital analog converter, can realize output and the proportional analog voltage signal of space magnetic field signal, conveniently be connected to and analyze on the miscellaneous equipment and store.
Description of drawings
Fig. 1 is the locking-typed space magnetic field detection system of a digital signal of the present invention structural representation;
Fig. 2 is the schematic diagram of space magnetic field signal prefabricated unit of the present invention;
Fig. 3 is the schematic diagram of the prefabricated signal generator of the present invention;
Fig. 4 is the schematic diagram of number lock signal processing unit of the present invention.
Label among the figure:
The 1-primary amplifier, 2-frequency band custom filter, 3-post-amplifier; The 4-A/D analog/digital converter, 5-keyboard, 6-CPU central processing unit; The 7-D/A digital analog converter, 8-LCD, the prefabricated signal generator of 9-; 10-number lock signal processing unit, 11-space magnetic field signal prefabricated unit, 12-air core coil.
Embodiment
The invention provides a kind ofly,, technical scheme of the present invention is done further explain through specific embodiment below in conjunction with accompanying drawing with the locking-typed space magnetic field detection system of digital signal.
As shown in Figure 1 is the locking-typed space magnetic field detection system of digital signal of the present invention structural representation.The locking-typed space magnetic field detection system of digital signal disclosed by the invention comprises air core coil 12, space magnetic field signal prefabricated unit 11, prefabricated signal generator 9 and number lock signal processing unit 10.Through the space magnetic field signal of air core coil 12 sense faults circuits, and the space magnetic field signal of measuring is input in the space magnetic field signal prefabricated unit 11, the space magnetic field input signal is setovered and amplified; Then according to the frequency range of the space magnetic field of required measurement; Number lock signal processing unit (10) output steering order; The band connection frequency and the bandwidth of adjustment space magnetic field signal prefabricated unit 11 are carried out bandpass filtering to the signal after amplifying, and carry out signal at last again and amplify.Prefabricated signal generator (9) produces amplitude, phase place and frequency sine wave, square wave or the triangular wave of programming Control in real time; Steering order according to number lock signal processing unit (10) output; Prefabricated signal generator (9) generates the square wave of the determined amplitude of steering order, phase place and frequency, sinusoidal wave or triangular wave in real time, and the signal that this generated is inputed to said number lock signal processing unit (10); The output signal of space magnetic field signal prefabricated unit 11 and the output signal of prefabricated signal generator 9 are input in the number lock signal processing unit 10; Number lock signal processing unit 10 outputs a control signal in space magnetic field signal prefabricated unit 11 and the prefabricated signal generator 9 according to the frequency and the amplitude Characteristics of space magnetic field signal; Adjust channel filtering frequency in the space magnetic field signal prefabricated unit (11) in real time; And amplitude, phase place and the frequency of prefabricated signal generator (9) square wave that generates, sine wave or triangular wave; Constitute signal close-loop feedback structure, number lock signal processing unit 10 receives and space magnetic field signal and prefabricated signal is calculated
Up
1＝Sx(t)×Ry(t)
Wherein, Sx (t) has passed through the space magnetic field signal that enters into number lock signal processing unit (10) behind the space magnetic field signal prefabricated unit (11), and Ry (t) is the signal that prefabricated signal generator (9) is produced, Ry (t-T/4) be prefabricated signal generator (9) the signal elapsed time T/4 that produces postpone the signal that the back forms; T is the cycle of the space magnetic field signal of required measurement; Vs is the amplitude of the space magnetic field signal that calculates, and θ s is the phase place of the space magnetic field signal that calculates, Up
1Be homophase phase sensitivity signal, Up
2It is anti-phase phase sensitivity signal.On LCD 8, show result of calculation, drive digital/analog converter 7 simultaneously, output and the proportional analog voltage signal of space magnetic field signal.
The schematic diagram of space magnetic field signal prefabricated unit is as shown in Figure 2, and space magnetic field signal prefabricated unit 11 is made up of primary amplifier 1, frequency band custom filter 2, post-amplifier 3.
The schematic diagram of prefabricated signal generator is as shown in Figure 3; Prefabricated signal generator 9 is made up of AD9833, AD584, OP07 and active crystal oscillator OSC CXO and resistance R 41, R42, R43, R44; The 8th, 7,6 pin of AD9833 are corresponding continuous with port P0.4, P0.5, the P0.6 of central processor CPU 8051F040 respectively, the electric capacity of cross-over connection 0.1uF between the 3rd and 4 pin of AD9833, the electric capacity of cross-over connection 0.01uF between the 1st and 2 pin of AD9833; Active crystal oscillator OSC CXO is connected to the 5th pin of AD9833; AD9833 is through being connected with resistance R 43 with the filter network that 0.01uF, 20pF, 1uF electric capacity are constituted by 800 Ohmages, and the 1st, 2 pin of AD584 are connected with resistance R 42, the electric capacity of cross-over connection 0.01uF between the 6th and 7 pin of AD584; Resistance R 42, R43 are connected with the in-phase end of OP07; Resistance R 41 is connected with the end of oppisite phase of OP07, and resistance R 44 is connected across between the end of oppisite phase and output terminal of OP07, and the output terminal of OP07 is connected with number lock signal processing unit 10.
The schematic diagram of number lock signal processing unit is as shown in Figure 4; Constitute by central processor CPU 8051F040, LCD LCM046 and keyboard; The P1.0 of 8051F040, P1.1, P1.2, P1.3 respectively with port/CS of LCM046 ,/RD ,/WR, the corresponding connection of DA; The positive pole of the light emitting diode among photoelectrical coupler O1, O2, O3 and the O4 with receive after 500 Ohmages are connected+the 9V power supply on; The negative pole of the light emitting diode among photoelectrical coupler O1, O2, O3 and the O4 is received power supply on the ground with keyboard switch K1, K2, K3 with after K4 is connected; The collector of the phototriode among photoelectrical coupler O1, O2, O3 and the O4 receives respectively with after the 5.6K Ohmage is connected+the 3.3V power supply on; The emitter of the phototriode among photoelectrical coupler O1, O2, O3 and the O4 is received power supply on the ground respectively with after 500 Ohmages are connected; The emitter of the phototriode among photoelectrical coupler O1, O2, O3 and the O4 respectively with corresponding connection of P1.4, P1.5, P1.6, P1.7 of 8051F040; The A/D analog/digital converter adopts the built-in A/D module of 8051F040, and through end points P3.0, P3.1 input analog amount signal, the end points P30 of the P3.0 of 8051F040, P3.1, P31 are connected with the exit point Pad of space magnetic field signal prefabricated unit and the output terminal P11 of prefabricated signal generator; The end points P40 of the P4.0 of 8051F040, P4.1, P41 are connected with end points P1, the P2 of space magnetic field signal prefabricated unit; The D/A digital analog converter adopts the built-in D/A module of 8051F040, through end points P2.0 output analog signals, and the end points Pout output analog signals of the P2.0 of 8051F040.
Claims (5)
1. the locking-typed space magnetic field detection system of digital signal comprises air core coil (12), space magnetic field signal prefabricated unit (11), prefabricated signal generator (9) and number lock signal processing unit (10), it is characterized by:
Through the space magnetic field signal of said air core coil (12) sense faults circuit, said space magnetic field signal is input in the space magnetic field signal prefabricated unit (11), to said space magnetic field signal amplify, Filtering Processing;
Through said space magnetic field signal prefabricated unit (11) to said space magnetic field signal amplify, filtered output signal inputs in the number lock signal processing unit (10);
Said prefabricated signal generator (9) produces amplitude, phase place and frequency sine wave, square wave or the triangular wave of programming Control in real time; Steering order according to number lock signal processing unit (10) output; Prefabricated signal generator (9) generates the square wave of the determined amplitude of steering order, phase place and frequency, sinusoidal wave or triangular wave in real time, and the signal that this generated is inputed to said number lock signal processing unit (10);
Number lock signal processing unit (10) is exported steering order respectively in space magnetic field signal prefabricated unit (11) and prefabricated signal generator (9) according to the frequency and the amplitude Characteristics of said space magnetic field signal; Adjust channel filtering frequency in the space magnetic field signal prefabricated unit (11) in real time; And amplitude, phase place and the frequency of prefabricated signal generator (9) square wave that generates, sine wave or triangular wave, constitute signal close-loop feedback structure;
The amplitude and the phase place of the said space magnetic field signal that said number lock signal processing unit (10) calculates according to said space magnetic field signal and prefabricated signal, and with the proportional analog voltage signal of said space magnetic field signal amplitude; And, drive digital/analog converter (7) simultaneously, output and the proportional analog voltage signal of said space magnetic field signal in the said result of calculation of the last demonstration of LCD (8).
2. the locking-typed space magnetic field detection system of digital signal according to claim 1 is characterized by:
Said space magnetic field signal prefabricated unit (11) is made up of primary amplifier (1), frequency band custom filter (2), post-amplifier (3);
The space magnetic field signal of said air core coil (12) output at first inputs to said primary amplifier; Carry out the biasing and the amplification of signal; Carry out Filtering Processing through said frequency band custom filter (2) then, according to the frequency range of the space magnetic field of required measurement, number lock signal processing unit (10) output steering order; Potentiometer numerical value in the control frequency band custom filter (2); The band connection frequency and the bandwidth of adjustment frequency band custom filter (2) are carried out bandpass filtering to the output signal of primary amplifier, after post-amplifier (3) for the second time signal input to said number lock signal processing unit (10) after amplifying.
3. the locking-typed space magnetic field detection system of digital signal according to claim 2 is characterized by:
Said primary amplifier (1) is by 11-13 resistance (R11, R12, R13) and potentiometer (R14) and the 1st operational amplifier (U1) formation; The 12nd resistance (R12) is connected across between the inverting input of air core coil (12) output terminal and the 1st operational amplifier (U1); The 13rd resistance (R13) is connected across between the normal phase input end and signal ground of the 1st operational amplifier (U1); The 11st resistance (R11) is connected across between the inverting input and output terminal of the 1st operational amplifier (U1); Potentiometer (R14) is connected across between the biasing anode and biasing negative terminal of the 1st operational amplifier (U1), and the negative power end of the 1st operational amplifier (U1) is received in the adjustable side of potentiometer (R14);
Said frequency band custom filter (2) is made up of wave filter UAF42, the 4th voltage follower (U4), the 6th voltage follower (U6) and digital regulation resistance X9241; The 2nd pin of wave filter UAF42 connects the output pin of the 1st operational amplifier (U1); The 31st resistance (R31) is connected across between the 2nd pin and signal ground of wave filter UAF42; The 32nd resistance (R32) is connected across between the 12nd pin and the 8th pin of wave filter UAF42; The 31st electric capacity (C31) is connected across between the 7th pin and the 8th pin of wave filter UAF42; The 32nd electric capacity (C32) is connected across between the 1st pin and the 14th pin of wave filter UAF42; The 6th pin of digital regulation resistance X9241 is connected to the 14th pin of said wave filter UAF42, and the 7th pin of digital regulation resistance X9241 is connected to the 3rd pin of wave filter UAF42, and the 4th voltage follower (U4) is connected across between the 1st pin and the 7th pin of digital regulation resistance X9241; The 6th voltage follower (U6) is connected across between the 19th pin and the 11st pin of digital regulation resistance X9241, and the 9th pin of digital regulation resistance X9241 is connected with number lock signal processing unit (10) with the 14th pin; Said post-amplifier (3) is made up of 21-23 resistance (R21, R22, R23) and the 2nd operational amplifier (U2); The 22nd resistance (R22) is connected across between the inverting input of the 1st pin and the 1st operational amplifier (U1) of wave filter UAF42; The 23rd resistance (R23) is connected across between the normal phase input end and signal ground of the 1st operational amplifier (U1); The 21st resistance (R21) is connected across between the inverting input and output terminal of the 1st operational amplifier (U1), and the output terminal of the 1st operational amplifier (U1) is connected with number lock signal processing unit (10).
4. the locking-typed space magnetic field detection system of digital signal according to claim 1 is characterized by:
Said prefabricated signal generator (9) is made up of signal generator AD9833, reference voltage source AD584, operational amplifier OP07 and active crystal oscillator and 41-43 resistance (R41, R42, R43, R44); Active crystal oscillator is connected to the 5th pin of signal generator AD9833; Signal generator AD9833 is through being connected with the 43rd resistance (R43) by behind 800 Ohmages and the filter network that 0.01uF, 20pF, 1uF electric capacity are constituted; The 1st, 2 pin of reference voltage source AD584 are connected with the 42nd resistance (R42); 42nd, 43 resistance (R42, R43) are connected with the in-phase end of operational amplifier OP07; The 41st resistance (R41) is connected with the end of oppisite phase of operational amplifier OP07; The 44th resistance (R44) is connected across between the end of oppisite phase and output terminal of operational amplifier OP07, and the output terminal of operational amplifier OP07 is connected with number lock signal processing unit (10).
5. the locking-typed space magnetic field detection system of digital signal according to claim 1 is characterized by:
The locking-typed space magnetic field detection system of digital signal adopts handheld structure, utilizes powered battery.
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| CN 201110413005 CN102495380B (en) | 2011-12-13 | 2011-12-13 | Digital signal locking type spatial magnetic field detecting system |
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| CN 201110413005 CN102495380B (en) | 2011-12-13 | 2011-12-13 | Digital signal locking type spatial magnetic field detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107991631A (en) * | 2017-11-20 | 2018-05-04 | 哈尔滨工业大学 | A kind of magnetic signal measuring device and method for not depending on phase |
| CN108008323A (en) * | 2017-11-20 | 2018-05-08 | 哈尔滨工业大学 | A kind of magnetic signal measuring device and method based on low-pass filtering |
| CN108007970A (en) * | 2016-11-01 | 2018-05-08 | 克洛纳测量技术有限公司 | Method and measuring apparatus for the characteristic for determining medium |
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Cited By (4)
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| CN108007970A (en) * | 2016-11-01 | 2018-05-08 | 克洛纳测量技术有限公司 | Method and measuring apparatus for the characteristic for determining medium |
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