CN2842449Y - Digital metal pipeline path tracing identifying device - Google Patents
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- CN2842449Y CN2842449Y CN 200520024149 CN200520024149U CN2842449Y CN 2842449 Y CN2842449 Y CN 2842449Y CN 200520024149 CN200520024149 CN 200520024149 CN 200520024149 U CN200520024149 U CN 200520024149U CN 2842449 Y CN2842449 Y CN 2842449Y
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Abstract
A kind of digital type metal pipeline path trace identification device belongs to fields of measurement.Comprise that signal transmits and receives device, it is characterized in that sender unit is a frequency multiplication double-sound signal transmitter frequently, be made of low frequency signal generation unit, high-frequency signal generation unit, signal synthesis unit, power amplification unit and output unit, it is the frequency multiplication relation that the output signal frequency of high and low frequency signal generation unit is closed; Its signal receiving device is made of low, high-frequency signal induction installation, low frequency/high-frequency signal amplifying unit, phase difference calculating unit, CPU (central processing unit) and indicator.The utility model is specially adapted to that electromagnetic interference (EMI) is strong, environment is than complicated situation or the intensive zone of various metal pipe line, its circuit structure is succinct, volume is little, anti-external interference ability is strong, can reduce the blindness of pipeline detection, the efficient height of detection operations, testing staff's working strength is little, can be widely used in fields such as the path trace of various metal pipe lines or power cable and uniqueness identification.
Description
Technical field
The utility model belongs to fields of measurement, relates in particular to a kind of device that the path is surveyed or detected that lays that is used for metal pipe line or sheathed cable.
Background technology
Because a variety of causes, often need the metal pipe line that laid or the path of specifically laying of cable (metal sheath layer of cable and conductive core line also are equivalent to metal pipe line) are surveyed or searched.
Because often there is certain difference in construction drawing and the actual path of laying when laying; Perhaps, factors such as, personnel change remote because of the time cause construction drawing at that time to be difficult to find, and just need solve problem by carrying out the actual detection of laying the path of metal pipe line this moment.
The day for announcing is on November 3rd, 1999, and notification number is in the Chinese patent " underground pipeline trace band " of CN 2346847Y, discloses a kind of underground pipeline trace band, comprises two layers of plastic film up and down, accompanies metal forming between the two layers of plastic film.During use, it simultaneously performs indicia patterns or literal, is attached on the underground pipeline of laying.When surveying with the X-ray detection X instrument, the reflection of metal forming and indicia patterns or literal can clearly be apparent on the instrument, thereby are accurately measured pipeline location.But it need be about to underground pipeline trace band when pipeline construction and underground pipeline lays simultaneously, need survey with the X-ray detection X instrument, can't use the pipeline that has laid, and will use the X-ray detection X instrument, user of service's safe, health is had certain influence.
Detecting metal pipeline technology commonly used now, generally send tone currents to metal pipe line by signal generator, metal pipe line is then to external radiation frequency magnetic field together, sensing coil magnetic field sensor signal by receiver, amplify after earphone or gauge outfit are exported, judge the position of pipeline by the size of judging signal amplitude.
For example, the day for announcing is on February 2nd, 2000, and notification number is in the Chinese patent of CN 2362135Y, discloses a kind of " buried cable detector ", and it adopts two probe coils, receives simultaneously by signal generator and is applied to low-frequency ac electric current on the cable.The induced potential that varies in size that the electromagnetic field that this marking current forms produces at two probe coils is converted to the gauge outfit indication, therefrom zero point gauge outfit the orientation of yawing moment indication cable.
But because the ground wire of adjacent line refluxes and faradic existence, also can give off homogenous frequency signal, pipeline to be measured and adjacent line many times only can't be distinguished by the amplitude size of signal in complicated and pipeline compact district at environment, cause the tracking wire mistake.
In addition, when the uniqueness of pipeline is differentiated, discriminating to power cable, traditional method is around one week of cable with inductive coil, signal according to cable under test has strong and weak the variation in around process, and adjacent line does not have this phenomenon to differentiate, its artificial factor is too many, needs the operator that very strong practical operation experience is arranged.
Present some novel cable and pipeline identifier (or claiming identifier), by inject the pulse direct current signal of big electric current to cable or metal pipe line, block cable or metal pipe line with the reception clamp, judge according to the direction of the amplitude of detecting signal and DC current and to differentiate and correct errors, the volume of its instrument is bigger, and fail to provide the whether correct information of discriminating, still need the operator to judge by rule of thumb and draw testing result.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of digital type metal pipeline path trace identification device, it is judged by the phase differential that injects frequency multiplication formula magnetic field that current signal produces and clearly indicates the pipeline path trace by indicator is correctly or mistake, also can carry out the uniqueness of pipeline differentiates, thereby reduced the fault rate of pipeline detection, be specially adapted to various environment than complexity or the intensive zone of pipeline, whole device circuit is succinct, volume is little, in light weight, be easy to carry, can improve the security of testing, increase work efficiency, reduce working strength, reduce experience requirement pipeline detection device user.
The technical solution of the utility model is: a kind of digital type metal pipeline path trace identification device is provided, comprise the sender unit and the packaged type signal receiving device that are connected with metal pipe line, it is characterized in that: described sender unit is a frequency multiplication double-sound signal transmitter frequently, it includes low frequency signal generation unit, high-frequency signal generation unit, signal synthesis unit, power amplification unit and output unit, and it is the frequency multiplication relation that the output signal frequency of its described high-frequency signal generation unit and low frequency signal generation unit is closed; Its signal synthesis unit synthesizes low frequency signal and high-frequency signal, carries out power amplification through power amplification unit, does final double-audio signal output through output unit again; Described packaged type signal receiving device includes low, the high-frequency signal induction installation, the low frequency signal amplifying unit, the high-frequency signal amplifying unit, the phase difference calculating unit, CPU (central processing unit) and indicator, it is low, the high-frequency signal induction installation is responded to low frequency and the formed magnetic field radiation of high-frequency current on the reception metal pipe line respectively, the signal of sensing is after low frequency signal amplifying unit and high-frequency signal amplifying unit amplify respectively, high-frequency signal and low frequency signal enter the phase difference calculating unit jointly, draw the phase differential between low frequency signal and the high-frequency signal, CPU (central processing unit) is remembered the phase differential of metal pipe line known segment, phase differential to unknown segment compares, according to comparative result, the control indicator carries out clear and definite prompting.
Wherein, the frequency of described high-frequency current signal is the integral multiple of low-frequency current signal frequency, is preferably the frequency multiplication relation of even-multiple.
The low frequency signal generation unit of its described double-audio signal transmitter and high-frequency signal generation unit are sine-wave oscillator circuit or square-wave oscillator circuit; Described signal synthesis unit is an adder circuit; Described power amplification unit and output unit comprise power amplifier, output transformer and corresponding protection circuit.
Low, the high-frequency signal induction installation of its described packaged type signal receiving device is low frequency signal inductive coil and high-frequency signal inductive coil, perhaps receives clamp for picking up signal.
The low frequency signal amplifying unit of its described packaged type signal receiving device and high-frequency signal amplifying unit are variable gain amplifier circuit and filter circuit; Described phase difference calculating unit is made of A/D converter and microprocessor, also can be the simulation phase detector circuit; Described CPU (central processing unit) is a microcontroller circuit; Described indicator is LCD LCD, LED light emitting diode, loudspeaker or the earphone that has the respective peripheral accessory circuit.
The parallel axes of its described low frequency signal inductive coil and high-frequency signal inductive coil, the axis horizontal of two coils be in the plane of laying of pipeline, and vertical with the path of pipeline; The formed plane of the axis of two coils is parallel or vertical with the pipeline path.
Its described signal synthesis unit comprises operational amplifier U101 and resistance 1R101～1R103, wherein, "-" input end of operational amplifier U101 constitutes its unit input end A through resistance 1R101, constitute its unit input end B through resistance 1R102, "+" input end grounding of operational amplifier U101, resistance 1R103 is attempted by between "-" input end and its output terminal of operational amplifier U101, and the output terminal of operational amplifier U101 constitutes its unit output terminal C.
Its described amplifying unit is made of operational amplifier U101A, B, capacitor C 101, C102, C103, potentiometer VR101, resistance R 101, R102, R103 and R104, wherein, capacitor C 101 and sensing coil parallel connection, form antiresonant circuit, resonance frequency is that transmitter is added in the AC current frequency on the pipeline; "-" input end of operational amplifier U101A is connected with an end of sensing coil through resistance R 101, "+" input end grounding of operational amplifier U101A, its output terminal is connected with "+" input end of operational amplifier U101B with C102 through resistance R 102, and through resistance R 102 and R103 ground connection, be connected with the output terminal of capacitor C 103 with operational amplifier U101B through resistance R 102 simultaneously, potentiometer VR101 is attempted by between "-" input end and output terminal of operational amplifier U101A; "-" input end grounding of operational amplifier U101B, resistance R 104 are attempted by between "+" input end and output terminal of operational amplifier U101B, and the harmonious vibration frequency of its centre frequency is identical.
Compared with the prior art, the utility model has the advantages that:
1. the method that the amount of adopt injecting frequency multiplication formula double frequency current signal, detecting its phase differential, whether change and change according to its phase differential is judged is carried out the detection in metal pipe line path, clearly indicating the pipeline path trace by indicator correctly still is mistake, be specially adapted to that electromagnetic interference (EMI) is strong, environment is than complicated situation or the intensive zone of various metal pipe line, anti-external interference ability improves greatly, reduced testing staff's working strength, reduction has improved the efficient of detection operations greatly to pipeline detection device user's experience requirement.
2. when the uniqueness of carrying out metal pipe line or sheathed cable is differentiated, correct still mistake in the time of clearly indicating discriminating by indicator, can be rapidly and distinguish pipeline to be measured and adjacent line clearly, thereby reduced the blindness and the fault rate of pipeline detection, brought great convenience to finding target pipeline rapidly.
3. adopt the mode of the field signal phase differential that detects frequency multiplication formula double frequency electric current to carry out work, its circuit structure is succinct, whole device volume is little, in light weight, be easy to carry, "dead" and strong-electromagnetic field pollutes, and the device environment for use is safer, personal safety to operating personnel does not have influence, has further improved the security and the reliability of detection operations.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described further.
The connection diagram of pick-up unit when Fig. 1 is to use this method to carry out metal pipe line path trace or detection;
Fig. 2 is the functional-block diagram of double-audio signal transmitter;
Fig. 3 is the functional-block diagram of packaged type signal receiving device;
Fig. 4 is the embodiment wiring diagram of double-audio signal transmitter signal synthesis unit;
Fig. 5 is that the packaged type signal receiving device is low, the embodiment wiring diagram of high-frequency signal amplifying unit;
The connection diagram of pick-up unit when Fig. 6 is to use this method to carry out the discriminating of power cable uniqueness.
1 is the double-audio signal transmitter among the figure, and 2 is pipeline to be measured or cable, and 3 are contiguous pipeline or cable, and 4 is the packaged type signal receiving device, and 5 is low, high-frequency signal inductive coil, and 6 are picking up signal reception clamp.
Embodiment
Among Fig. 1, when using this method to carry out the detection of metal pipe line path (this figure is example with power cable), power cable 2 and 3 well connects the earth laying with its protective metal shell (or sheath, armouring) that requires in service at two ends, and the core insulation of protective metal shell itself and the earth and conduction.
The output terminal of transmitter 1 and the protective metal shell of cable 2 link, another output termination the earth, and the protective metal shell of cable 2 must be untied at the ground wire of transmitter terminal, disconnects and being connected of the earth, and must maintenance and being connected of the earth at the other end.
If will be defined as positive dirction from the direction of current that transmitter terminal flows to pipeline to be measured opposite end, the electric current on the pipeline then to be measured is a forward, and the electric current on the adjacent line is reverse.
Waveform M is the phase place synoptic diagram of the low-and high-frequency signal that receives when low, high-frequency signal inductive coil 5 are positioned at cable under test 2 tops, and waveform N is the phase place synoptic diagram of the low-and high-frequency signal that receives when low, high-frequency signal inductive coil 5 are positioned at adjacent cables 3 tops.
The parallel axes of low, the high-frequency signal inductive coil 5 of packaged type signal receiving device 4, its axis horizontal is laid plane (being generally ground) in cable, and with cable to lay the path vertical, two coils are placed from a distance, the plane that two coil axises form can be parallel with cable trace, also can be vertical, can also get other angle.
Low, high-frequency signal inductive coil 5 is the magnetic field that gives off of the marking current of two kinds of frequencies on the induction cable respectively, through signal receiving device 4 processing and amplifying respectively.Low frequency that forward and inverse current induce and high-frequency signal phase place are contrary, but because the frequency of high-frequency signal is the twice of low frequency signal frequency, cause the low-and high-frequency signal phase difference of forward current and the low-and high-frequency signal phase difference of inverse current to differ about 180 °, thereby can judge the positive reverse direction flow of electric current, specifically can be referring to waveform M among the figure and waveform N.
Signal receiving device is remembered the phase differential of low frequency signal and envelope signal as benchmark at the known segment of cable under test earlier, when unknown segment is surveyed, if phase differential does not have to change or changes in predetermined scope, indicator for displaying is followed the tracks of correct information, or do not do prompting and acquiescence follow the tracks of correct, this kind situation be equivalent among the figure when receiver 4 and low, when high-frequency signal inductive coil 5 is positioned at cable under test 2 tops; When the variation of phase differential exceeds predetermined value, the information of indicator for displaying trail-and-error, this kind situation be equivalent among the figure when receiver 4 and low, when high-frequency signal inductive coil 5 is positioned at adjacent cables 3 tops.
The frequency of the high-frequency current that signal generator sends is the twice of low-frequency current frequency, is the preferred frequency selection scheme of the utility model, also can adopt other combination of frequency; As long as the frequency of high-frequency current is the integral multiple of low-frequency current frequency, when the frequency of high-frequency current was the even-multiple of low-frequency current frequency, the low-and high-frequency signal phase difference that can obtain the low-and high-frequency signal phase difference of forward current and inverse current differed the result about 180 °; When the frequency of high-frequency current is the odd-multiple of low-frequency current frequency, the low-and high-frequency signal phase difference of the forward current that obtains and the low-and high-frequency signal phase difference of inverse current are less than 180 °, concrete numerical value is by the multiple decision of frequency, and it will make the data processing of signal receiver will become loaded down with trivial details.
This figure can also all untie the earth point at cable metal sheath two ends for surveying a kind of mode of connection of power cable, and transmitter connects a heart yearn of cable, and will connect the heart yearn good earth of transmitter in the cable opposite end.
This figure is example with the power cable, and the mode of connection of other metal pipe line is similar with it, all need transmitter terminal with pipeline and the earth be connected disconnection (if earth point is arranged), and it well need be connect the earth in the opposite end.Metal pipe line generally all has the anticorrosive coat of insulation, even anticorrosive coat has breakage, the resistance to earth of breaking point generally also is far longer than the resistance of pipeline opposite end good earth point, so little to the influence that detects data.
Among Fig. 2, sender unit includes low frequency signal generation unit, high-frequency signal generation unit, signal synthesis unit, power amplification unit and output unit, its signal synthesis unit synthesizes low frequency signal and high-frequency signal, carry out power amplification through power amplification unit, do final double-audio signal output through output unit again.
Sine-wave oscillator or square-wave oscillator that figure medium and low frequency signal generation unit and high-frequency signal generation unit can be made up of discrete device exclusive disjunction amplifier, also can be by the timer of software control single-chip microcomputer, produce the square-wave pulse of response frequency, square-wave pulse can directly use, and also can by wave filter it be shaped to sine wave again.
Its power amplification unit selects for use suitable conventional power discharging device or circuit to realize, output unit comprises conventional output transformer and holding circuit etc.
The embodiment circuit of its double-audio signal transmitter signal synthesis unit is referring to Fig. 4.
Among Fig. 3, the packaged type signal receiving device includes low, the high-frequency signal induction installation, the low frequency signal amplifying unit, the high-frequency signal amplifying unit, the phase difference calculating unit, CPU (central processing unit) and indicator, it is low, the high-frequency signal induction installation is responded to low frequency and the formed magnetic field radiation of high-frequency current on the reception metal pipe line respectively, the signal of sensing carries out processing and amplifying respectively through low frequency signal amplifying unit and high-frequency signal amplifying unit, high-frequency signal after the processing and low frequency signal enter the phase difference calculating unit jointly, draw the phase differential between low frequency signal and the high-frequency signal, CPU (central processing unit) is remembered the phase differential of metal pipe line known segment, phase differential to unknown segment compares, according to comparative result, the control indicator carries out clear and definite prompting.
Wherein, low, high-frequency signal induction installation is low frequency signal inductive coil and high-frequency signal inductive coil, and in the low frequency and the high frequency frequency of correspondence, induction receives low frequency and the formed magnetic field radiation of high-frequency current on the metal pipe line by shunt capacitance resonance for it.Its low frequency signal amplifying unit and high-frequency signal amplifying unit can adopt variable gain amplifier circuit and filter circuit.
Its function is realized with the simulation phase detector circuit in its phase difference calculating unit, also can realize its function under programmed control with A/D converter and microprocessor, if adopt a kind of mode in back, then the phase difference calculating unit can be incorporated in the CPU (central processing unit).
Its CPU (central processing unit) is conventional microcontroller circuit.
Its indicator can adopt LCD LCD or the LED light emitting diode that has the respective peripheral accessory circuit, carries out visual cues, also can carry out auditory tone cues by loudspeaker or earphone, all can as long as the indicating device of other types can carry out clear and definite prompting.
The concrete enforcement circuit of its low frequency signal amplifying unit and high-frequency signal amplifying unit is referring to Fig. 5.
Above-mentioned Fig. 2, the specific implementation of each unit has been routine and technique known at electronic technology field among Fig. 3, specifically can (Wang Jihao writes referring to " Basic Analog Electronics ", Shandong science tech publishing house, in March, 2002 publication) generation and the translation circuit (P219) of the waveform in the book, the computing of signal and treatment circuit (P177), ratio circuit (P177) is (as long as be changed to potentiometer with feedback resistance wherein by fixed resistance, can realize that adjustable gain amplifies) and the content of active band-pass filter related Sections such as (P204), its physical circuit can adopt discrete device to realize, also can adopt various integrated circuit to realize, no longer narrate at this.
Among Fig. 4, the A point is the input end of low frequency signal, and the B point is the input end of high-frequency signal, and the C point is the output terminal of the signal after synthesizing.
The signal synthesis unit of double-audio signal transmitter comprises operational amplifier U101 and resistance 1R101～1R103, wherein, "-" input end of operational amplifier U101 constitutes its unit input end A through resistance 1R101, constitute its unit input end B through resistance 1R102, "+" input end grounding of operational amplifier U101, resistance 1R103 is attempted by between "-" input end and its output terminal of operational amplifier U101, and the output terminal of operational amplifier U101 constitutes its unit output terminal C.
Low frequency signal and high-frequency signal enter two input ends of the totalizer that is made of U101, R101, R102, R103 respectively, the signal after the i.e. output of C end is synthetic.
Among Fig. 5, the amplifying unit of packaged type signal receiving device medium and low frequency signal and high-frequency signal is made of operational amplifier U101A, B, capacitor C 101, C102, C103, potentiometer VR101, resistance R 101, R102, R103 and R104, wherein, capacitor C 101 and sensing coil parallel connection, form antiresonant circuit, resonance frequency is that transmitter is added in the AC current frequency on the pipeline; "-" input end of operational amplifier U101A is connected with an end of sensing coil through resistance R 101, "+" input end grounding of operational amplifier U101A, its output terminal is connected with "+" input end of operational amplifier U101B with C102 through resistance R 102, and through resistance R 102 and R103 ground connection, be connected with the output terminal of capacitor C 103 with operational amplifier U101B through resistance R 102 simultaneously, potentiometer VR101 is attempted by between "-" input end and output terminal of operational amplifier U101A; "-" input end grounding of operational amplifier U101B, resistance R 104 are attempted by between "+" input end and output terminal of operational amplifier U101B, and the harmonious vibration frequency of its centre frequency is identical.
In the integrated circuit that the utility model adopted, operational amplifier can be selected LM324 or the identical or close integrated circuit of function with it for use, A/D converter can be selected TLC0832 or the identical or close integrated circuit of function with it for use, the model of the single-chip microcomputer of band A/D function can be selected C8051F020 or the identical or close integrated circuit of function with it for use, and other elements do not have specific (special) requirements.
Concrete enforcement circuit of the present utility model not only is confined to Fig. 4, circuit shown in Figure 5, and other circuits that can finish said function all can be realized the technical solution of the utility model, enumerate no longer one by one at this.
Among Fig. 6, if being used for the uniqueness of pipeline, receiver differentiates, then just low frequency signal inductive coil among Fig. 1 and high-frequency signal inductive coil 5 are changed to reception clamp 6, block the pipeline pickoff signals by clamp, other parts of receiver are identical, and the content of indicator prompting changes into differentiates correctly or differentiate wrong getting final product.
When using this method to carry out the discriminating of power cable uniqueness, the analysis of its mode of connection, current trend and signal is with the explanation of Fig. 1, difference is to use reception clamp 6 to block cable under test 2, can obtain clearer and more definite signal, fully shield extraneous interference, obtained clearer and more definite result.
The information of indicator for displaying is correct for differentiating, as scheming when differentiating that clamp 6 block cable under test 2; Or the discriminating mistake, as among the figure when differentiating that clamp 6 block adjacent cables 3.
Uniqueness for other types of metals pipeline differentiates that its principle and usage are also similar with it, specifically can be referring to the explanation of Fig. 1.
Because the method that the amount whether the utility model adopts the two-frequency signal be injected into the frequency multiplication relation, detects its phase differential, change and change according to its phase differential is judged is carried out the detection of metal pipe line, be specially adapted to that electromagnetic interference (EMI) is strong, environment is than complicated situation or the intensive zone of various metal pipe line, its anti-external interference ability is strong, testing staff's working strength is low, pipeline detection device user is not had specific (special) requirements, improved the efficient of detection operations greatly.When the uniqueness of carrying out metal pipe line or sheathed cable is differentiated, can be rapidly and distinguish pipeline to be measured and adjacent line clearly, thereby reduced the blindness and the fault rate of pipeline detection, brought great convenience to finding target pipeline rapidly, whole device circuit is succinct, volume is little, in light weight, be easy to carry, the device environment for use is safer, personal safety to operating personnel does not have influence, has further improved the security and the reliability of detection operations.
Industry and department for distribution situations such as position that under the situation that does not excavate earthing, needs accurate mensuration underground metal pipeline and cable and trends, as building, urban construction, public utilities, electric power, geology, prospecting, oil, railway, communication etc., its strong instrument that all is absolutely necessary can be widely used in the underground pipe network generaI investigation of departments such as urban construction, public utilities, geologic prospecting, planning and design; Or be used for the detecting metal pipeline of units such as oil, right gas, tap water; Or be used for the detection of the power cable of electric power and communication section; Or be used for engineering construction department surveys facilities such as underground utilities, cable before construction distribution.
The utility model can be widely used in the generaI investigation of underground pipe network, the path trace of metal pipe line or the field of detecting such as uniqueness identification of power cable.
Claims (8)
1. a digital type metal pipeline path trace identification device comprises the sender unit and the packaged type signal receiving device that are connected with metal pipe line, it is characterized in that:
Described sender unit is a frequency multiplication double-sound signal transmitter frequently, it includes low frequency signal generation unit, high-frequency signal generation unit, signal synthesis unit, power amplification unit and output unit, and it is the frequency multiplication relation that the output signal frequency of its described high-frequency signal generation unit and low frequency signal generation unit is closed; Its signal synthesis unit synthesizes low frequency signal and high-frequency signal, carries out power amplification through power amplification unit, does final double-audio signal output through output unit again;
Described packaged type signal receiving device includes low, the high-frequency signal induction installation, the low frequency signal amplifying unit, the high-frequency signal amplifying unit, the phase difference calculating unit, CPU (central processing unit) and indicator, it is low, the high-frequency signal induction installation is responded to low frequency and the formed magnetic field radiation of high-frequency current on the reception metal pipe line respectively, the signal of sensing is after low frequency signal amplifying unit and high-frequency signal amplifying unit amplify respectively, enter the phase difference calculating unit jointly, draw the phase differential between low frequency signal and the high-frequency signal, CPU (central processing unit) is remembered the phase differential of metal pipe line known segment, phase differential to unknown segment compares, according to comparative result, the control indicator carries out clear and definite prompting.
2. according to the described digital type metal pipeline of claim 1 path trace identification device, the frequency that it is characterized in that described high-frequency current signal is the integral multiple of low-frequency current signal frequency, is preferably the frequency multiplication relation of even-multiple.
3. according to the described digital type metal pipeline of claim 1 path trace identification device, it is characterized in that
The low frequency signal generation unit of described double-audio signal transmitter and high-frequency signal generation unit are sine-wave oscillator circuit or square-wave oscillator circuit;
Described signal synthesis unit is an adder circuit;
Described power amplification unit and output unit comprise power amplifier, output transformer and corresponding protection circuit.
4. according to the described digital type metal pipeline of claim 1 path trace identification device, low, the high-frequency signal induction installation that it is characterized in that described packaged type signal receiving device is low frequency signal inductive coil and high-frequency signal inductive coil, perhaps receives clamp for picking up signal.
5. according to the described digital type metal pipeline of claim 1 path trace identification device, it is characterized in that
The low frequency signal amplifying unit of described packaged type signal receiving device and high-frequency signal amplifying unit are variable gain amplifier circuit and filter circuit;
Described phase difference calculating unit is made of A/D converter and microprocessor, also can be the simulation phase detector circuit;
Described CPU (central processing unit) is a microcontroller circuit;
Described indicator is LCD LCD, LED light emitting diode, loudspeaker or the earphone that has the respective peripheral accessory circuit.
6. according to the described digital type metal pipeline of claim 4 path trace identification device, the parallel axes that it is characterized in that described low frequency signal inductive coil and high-frequency signal inductive coil, the axis horizontal of two coils is in the plane of laying of pipeline, and vertical with the path of pipeline; The formed plane of the axis of two coils is parallel or vertical with the pipeline path.
7. according to claim 1 or 3 described digital type metal pipeline path trace identification devices, it is characterized in that described signal synthesis unit comprises operational amplifier U101 and resistance 1R101～1R103, wherein, "-" input end of operational amplifier U101 constitutes its unit input end A through resistance 1R101, constitute its unit input end B through resistance 1R102, "+" input end grounding of operational amplifier U101, resistance 1R103 is attempted by between "-" input end and its output terminal of operational amplifier U101, and the output terminal of operational amplifier U101 constitutes its unit output terminal C.
8. according to the described digital type metal pipeline of claim 1 path trace identification device, it is characterized in that described low, high-frequency signal amplifying unit is made of operational amplifier U101A, B, capacitor C 101, C102, C103, potentiometer VR101, resistance R 101, R102, R103 and R104, wherein, capacitor C 101 and sensing coil parallel connection, form antiresonant circuit, resonance frequency is that transmitter is added in the AC current frequency on the pipeline; "-" input end of operational amplifier U101A is connected with an end of sensing coil through resistance R 101, "+" input end grounding of operational amplifier U101A, its output terminal is connected with "+" input end of operational amplifier U101B with C102 through resistance R 102, and through resistance R 102 and R103 ground connection, be connected with the output terminal of capacitor C 103 with operational amplifier U101B through resistance R 102 simultaneously, potentiometer VR101 is attempted by between "-" input end and output terminal of operational amplifier U101A; "-" input end grounding of operational amplifier U101B, resistance R 104 are attempted by between "+" input end and output terminal of operational amplifier U101B, and the harmonious vibration frequency of its centre frequency is identical.
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| CN 200520024149 CN2842449Y (en) | 2005-05-25 | 2005-05-25 | Digital metal pipeline path tracing identifying device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101634720B (en) * | 2008-07-25 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Metal detecting device and method |
| CN104199111A (en) * | 2014-09-10 | 2014-12-10 | 甬港现代工程有限公司 | Instrument for detecting embedded lines in mechanical and electrical installation |
| CN106569283A (en) * | 2016-11-11 | 2017-04-19 | 西南石油大学 | Buried iron pipeline detection and accurate positioning method based on magnetic field indirect detection |
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| CN110161570A (en) * | 2019-06-11 | 2019-08-23 | 武汉三相电力科技有限公司 | Cable run path detection method |
| CN111256041A (en) * | 2020-03-19 | 2020-06-09 | 彭继伟 | Crude oil pipeline discrimination instrument |
| CN114325157A (en) * | 2021-11-23 | 2022-04-12 | 广东电网有限责任公司广州供电局 | Remote power grid fault detection system |
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2005
- 2005-05-25 CN CN 200520024149 patent/CN2842449Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101634720B (en) * | 2008-07-25 | 2011-09-28 | 鸿富锦精密工业（深圳）有限公司 | Metal detecting device and method |
| CN104199111A (en) * | 2014-09-10 | 2014-12-10 | 甬港现代工程有限公司 | Instrument for detecting embedded lines in mechanical and electrical installation |
| CN104199111B (en) * | 2014-09-10 | 2017-01-11 | 甬港现代工程有限公司 | Instrument for detecting embedded lines in mechanical and electrical installation |
| CN106569283A (en) * | 2016-11-11 | 2017-04-19 | 西南石油大学 | Buried iron pipeline detection and accurate positioning method based on magnetic field indirect detection |
| CN107462928A (en) * | 2017-09-22 | 2017-12-12 | 中国有色金属工业昆明勘察设计研究院有限公司 | A kind of system of Underground sewage network position |
| CN110161570A (en) * | 2019-06-11 | 2019-08-23 | 武汉三相电力科技有限公司 | Cable run path detection method |
| CN111256041A (en) * | 2020-03-19 | 2020-06-09 | 彭继伟 | Crude oil pipeline discrimination instrument |
| CN114325157A (en) * | 2021-11-23 | 2022-04-12 | 广东电网有限责任公司广州供电局 | Remote power grid fault detection system |
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