CN104155696A - Distributed time-domain induced polarization receiving device and realizing method - Google Patents
Distributed time-domain induced polarization receiving device and realizing method Download PDFInfo
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Abstract
The invention discloses a distributed time-domain induced polarization receiving device and a realizing method. The distributed time-domain induced polarization receiving device comprises a main control unit, a data transmission unit and a receiver unit. The receiver unit is used for synchronous observation of multiple channels of multiple receivers and full-waveform acquisition of large-dynamic-range and high-precision sampling data. The data transmission unit is used for long-distance wired high-speed transmission of data processed between receivers and the main control unit. The main control unit is used for collecting receiver data, carrying out preprocessing and mapping display, monitoring the real-time working state of the receivers, storing data files, and realizing subsequent indoor fine data processing. Multi-channel distributed receiving systems for simultaneous observation are arranged at a plurality of measuring points. According to the invention, the efficiency of field electrical prospecting work can be significantly improved, software and hardware are optimized simultaneously for noise suppression, the signal-to-noise ratio of the induced polarization receivers is improved, the operation is convenient, the robustness is strong, and the work efficiency of the systems is improved.
Description
Technical field
The present invention relates to a kind of electrical measuring instrument,, particularly relate to a kind of distributed IP of time domain receiving trap and implementation method.
Background technology
Resistivity prospecting is to utilize the electromagnetic property of rock and ore and the difference of electrochemical properties in the earth's crust, by to the observation of the space distribution rule of electromagnetic field and time response and research, realize and find dissimilar useful mineral products, find out the geophysical exploration method of tectonic structure and solution geological problem.
As the important branch method of resistivity prospecting, it is material base that induced polarization method (IP) be take resistivity and two physical parameters of polarizability, and the distributed intelligence of underground medium electric conductivity and two aspects of electrochemical activity can be provided.The instrument of time-domain induced polarization method (TDIP) is relatively simple, popularity is high, data is processed and two, 3-d inversion technology maturation, be widely used in fields such as reconnoitring metal and non-metal solid mineral resources, groundwater resource and hydrocarbon resources, respond well.Along with the increasing of resource detection difficulty, actual investigation and prospecting is had higher requirement to swashing the application of method for electrically, is mainly manifested in that depth of exploration is large, result of detection requirement is meticulousr.
At present, the domestic overwhelming majority's exploration unit carries out swashs the main time-domain induced polarization method (TDIP) that adopts of electricity work, and the induced polarization instrument device system of use be take domestic as main.Efficiently and reliably obtaining a large amount of high precision and swash aspect the ability of electric data, the sharp electric receiver generally adopting at present also has larger gap, weak point major embodiment in the following areas:
1. the number of channels of receiver few (single channel or passage are few), field work efficiency is low;
2. receiver detection signal resolution characteristic is poor, and measuring accuracy is low;
3. receiver does not possess full waveform recording function, and the apparent chargeability in several moment after apparent chargeability after repeatedly stack or power-off is generally only provided, and cannot carry out follow-up denoising and quality of data evaluation;
4. receiver is without Real-time Monitoring Data quality function, and collection can only blindly superpose.
Therefore, a large amount of high precision of effective acquisition swash electric data becomes the current technical barrier in the urgent need to address of induced polarization method.Develop modern time territory induced polarization instrument device system, make high-effect high-quality obtain intensive measuring point or area observational data becomes possibility, could really realize the target of the meticulous detection of induced polarization method, and become a kind of new technical need.
Summary of the invention
The object of this invention is to provide a kind of distributed IP of time domain receiving trap and implementation method.In the present invention, distributed IP of time domain receiving trap comprises main control unit, number leaflet unit and receiver unit.The present invention has improved field resistivity prospecting work efficiency, and Optimization Software and hardware carry out squelch simultaneously, improves the signal to noise ratio (S/N ratio) that swashs electric receiver, and easy and simple to handle, strong robustness, has improved system works efficiency.
According to an aspect of the present invention, a kind of distributed IP of time domain receiving trap is provided, comprise: main control unit, be used for collecting receiver data and carry out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, storing data files, realizes follow-up indoor fine data and processes; Number leaflet unit, for the long distance wired high-speed transfer of data after processing between receiver and main control unit; Receiver unit, for the multichannel simultaneous observation of multi-receiver, the Full wave shape collection of great dynamic range, sampling with high precision data.
Preferably, described main control unit utilizes Ethernet or WIFI and number leaflet unit interconnected, with wired mode, connects a plurality of (1～n) multichannel receiver.
Preferably, described main control unit also, for the useful signal of the number leaflet unit transmission that superposes, improves the signal to noise ratio (S/N ratio) that receives signal.
Preferably, described several leaflet unit has been used for information transfer transmission, and provides remote power feeding for receiver.
Optionally, described several leaflet unit carries out equilibrium, pre-emphasis conditioning to RS485 physical channel, improves the signal waveform of receiving end, under high transmission rates, extends communication distance.
Preferably, described receiver unit adopts hardware low-pass filtering and notch filter technology to suppress the interference of given frequency noise to useful signal, improves signal to noise ratio (S/N ratio).
Preferably, it is mimic channel power supply that described receiver unit adopts the high-precision power of low ripple noise, and Digital and analog power supply is wiring separately.
Preferably, described receiver unit adopts shielding and earthing method, eliminates common-mode noise, avoids noise coupling in loop.
Optionally, described receiver unit gathers potential difference of total field when transmitter is powered, and gathers voltage of secondary field during transmitter power-off, realizes the real-time monitoring of data in collection in worksite process.
Optionally, distributed IP of time domain receiving trap adopts distributed 8*n (n=1,2,3,4 ...) passage, measure the simultaneous observation of a plurality of receiver multi-measuring point simultaneously.
According to another aspect of the present invention, provide a kind of distributed IP of time domain receiving trap implementation method, having comprised: step S1, the interelectrode potential difference signal of conditioning receiver a minute two-way are delivered to respectively pre-sampling ADC and gain-programmed amplifier PGA; Step S2, receiver channel simultaneously pre-sampling ADC completes the thick sampling at a high speed for the first time of bipolar signal, dynamically generates the instantaneous gain of PGA after digitizing by FPGA in-line coding module, as the exponent of floating data, is cached in the inner FIFO of FPGA; Step S3, the simulating signal after amplification drops on half range of rear class ADC between full scale, by rear class high precision while sampling ADC, carries out meticulous sampling for the second time, and its transformation result is cached in the inside FIFO of FPGA as the mantissa of floating data; Step S4, measured signal is after transient floating point amplifies, and exponent and mantissa's two parts form AD transformation result; Step S5, number leaflet unit realizes the total line length distance wired of RS485 high-speed transfer by Shielded Twisted Pair; Step S6, main control unit is collected receiver data and is carried out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, storing data files, realizes follow-up indoor fine data and processes.
Preferably, in described step S1 and S2, adopt 12 8 passage ADC to complete simulating signal to the slightly sampling for the first time of digital signal.
Preferably, in described step S3, adopt 24 8 passage ADC to complete meticulous sampling for the second time.
Preferably, in described step S4, measured signal is after transient floating point amplifies, and exponent and mantissa's two parts form AD transformation result, and now receiver range of dynamic measurement DR is:
DR＝20lg2
L+N (1)
Wherein, 2
lfor PGA maximum gain, N is second level analog to digital conversion figure place.
Optionally, after described step S6, also comprise that step S7, main control unit send warning information after abnormal data being detected, make operating personnel's real-time monitoring data collection process at the scene.
Accompanying drawing explanation
Fig. 1 has shown the sharp electric receiving trap schematic diagram of the preferred embodiment of the present invention;
Fig. 2 has shown Instantaneous Floating-point Amplifier Circuit theory diagram in the receiver unit of the preferred embodiment of the present invention;
Fig. 3 has shown the distributed IP of time domain receiving trap one-piece construction block diagram of the preferred embodiment of the present invention;
Fig. 4 has shown the distributed IP of time domain receiving trap implementation method process flow diagram of the preferred embodiment of the present invention;
Fig. 5 has shown the distributed IP of time domain receiving trap implementation method process flow diagram of the optional embodiment of the present invention;
Embodiment
For making the object, technical solutions and advantages of the present invention more cheer and bright, below in conjunction with embodiment and with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these descriptions are exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, omitted the description to known configurations and technology, to avoid unnecessarily obscuring concept of the present invention.
The object of this invention is to provide a kind of distributed IP of time domain receiving trap and implementation method.Described distributed IP of time domain receiving trap comprises main control unit, number leaflet unit and receiver unit.Receiver unit is for the Full wave shape collection of the multichannel simultaneous observation of multi-receiver and great dynamic range, sampling with high precision data; Number leaflet unit is for the long distance wired high-speed transfer of data after processing between receiver and main control unit; Main control unit is used for collecting receiver data and carries out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, and storing data files, realizes follow-up indoor fine data and processes.Be laid in the hyperchannel distributed reception system of carrying out simultaneous observation on a plurality of measuring points, the present invention can significantly improve field resistivity prospecting work efficiency, Optimization Software and hardware carry out squelch simultaneously, improve the signal to noise ratio (S/N ratio) that swashs electric receiver, easy and simple to handle, strong robustness, improved system works efficiency.
Fig. 1 has shown the sharp electric receiving trap schematic diagram of the preferred embodiment of the present invention.
As shown in Figure 1, the sharp electric receiving trap of the preferred embodiment of the present invention comprises main control unit, number leaflet unit and receiver unit.
Main control unit is used for collecting receiver data and carries out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, storing data files, realize follow-up indoor fine data and process, in the specific embodiment of the invention, main control unit is a PC, by 100Mbps Ethernet or WIFI, be connected with number leaflet unit, guarantee the transfer efficiency of data, the useful signal that the number leaflet unit that simultaneously superposes transmits, improves the signal to noise ratio (S/N ratio) that receives signal.
Number leaflet unit is for the long distance wired high-speed transfer of data after processing between receiver and main control unit.In the specific embodiment of the invention, adopt 12V accumulator for the power supply of number leaflet unit, number leaflet unit is simultaneously for receiver unit provides remote power feeding; By Shielded Twisted Pair RS485 bus, realize the high-speed transfer of number leaflet unit and the long distance wired of receiver unit; Every receiver is all equipped with GPS module, synchronous with the collection realizing between receiver.
Receiver unit is for the multichannel simultaneous observation of multi-receiver, and the Full wave shape collection of great dynamic range, sampling with high precision data, adopts hardware low-pass filtering and notch filter technology to suppress the interference of given frequency noise to useful signal, improves signal to noise ratio (S/N ratio); The high-precision power that adopts low ripple noise is mimic channel power supply, and Digital and analog power supply is wiring separately; Adopt shielding and earthing method, eliminate common-mode noise, avoid noise coupling in loop.In the specific embodiment of the invention, swash electric receiving trap and comprise n platform receiver, be numbered respectively receiver 1, receiver 2 and receiver n, wherein, receiver unit and number leaflet unit, receiver 1 and receiver 2, receiver 2 and receiver 3, receiver n-1 and receiver n realize the high efficiency of transmission of down order and upstream data by RS485, 1～8 passage of receiving electrode is connected to receiver 1, 9～16 passages of receiving electrode are connected to receiver 2, 8n-7～8n passage of receiving electrode is connected to receiver n, main control unit, the efficient coupling of number leaflet unit and receiver unit, guaranteed the normal operation of sharp electric receiving trap.
Fig. 2 has shown Instantaneous Floating-point Amplifier Circuit theory diagram in the receiver unit of the preferred embodiment of the present invention.
As shown in Figure 2, in receiver unit, Instantaneous Floating-point Amplifier Circuit is comprised of 4 parts: 12 simultaneously pre-sampling ADC of 8 passages, 24 8 passages while sampling ADC, single-stage gain-programmed amplifier PGA and on-site programmable gate array FPGAs.In the preferred embodiment of the present invention, from left to right the order of connection is as follows: 1/8 channel analog signal is input in signal conditioning circuit, 12 simultaneously pre-sampling ADC of 8 passages are carried out ADC sampling to the outputting analog signal of signal conditioning circuit afterwards, gain-programmed amplifier carries out signal amplification simultaneously, scope is 0.125 to 128 times, through 24 8 passages while sampling ADC, carry out again simulating signal to the conversion of digital signal, be sent to afterwards in on-site programmable gate array FPGA, final exponent and mantissa's two parts form AD transformation result.Detailed process is as follows:
1. in receiver unit, the potential difference signal between receiving electrode is after conditioning (impedance matching, preposition amplification, low-pass filtering, notch filter), and a minute two-way is delivered to respectively pre-sampling ADC and gain-programmed amplifier PGA.
2. under FPGA sequential control, 12 simultaneously pre-sampling ADC of 8 passages complete the thick sampling at a high speed for the first time of bipolar signal, deliver to FPGA in-line coding module after digitizing, dynamically generate the instantaneous gain (2 of PGA
oto 2
l), as the exponent of floating data, be cached in the inside FIFO of FPGA.
3. after PGA amplifies, half range that the simulating signal of output drops on 24 ADC of rear class is between full scale, object is to prevent amplifier saturation, make the signal to noise ratio (S/N ratio) quantizing be similar to consistent, by 8 passage high precision while of rear class sampling ADC, carry out meticulous sampling for the second time, its transformation result is cached in the inside FIFO of FPGA as the mantissa of floating data.
4. last, measured signal is after transient floating point amplifies, and AD transformation result is comprised of exponent and mantissa's two parts, and now receiver range of dynamic measurement DR is:
DR＝20lg2
L+N
Wherein, 2
lfor PGA maximum gain, N is second level analog to digital conversion figure place, and lg is for take 10 operations of taking the logarithm that are the end.As shown from the above formula, when PGA gain is 128 to the maximum, second level ADC figure place is 24 o'clock, and the range of dynamic measurement DR of receiver can reach 186dB in theory, can meet the requirement of IP of time domain receiver unit range of dynamic measurement completely.
Fig. 3 has shown the distributed IP of time domain receiving trap one-piece construction block diagram of the preferred embodiment of the present invention.
As shown in Figure 3, in the preferred embodiment of the present invention, distributed IP of time domain receiving trap comprises main control unit, number leaflet unit and receiver unit, and three contacts closely, common guarantee the normal operation of sharp electric receiving trap.
Main control unit is used for collecting receiver data and carries out pre-service and one-tenth figure demonstration, the real-time working state of monitoring receiver, storing data files, realizes follow-up indoor fine data and processes, the first useful signal transmitting of the number leaflet that simultaneously superposes, improves the signal to noise ratio (S/N ratio) that receives signal.
Number leaflet unit is for the long distance wired high-speed transfer of data after processing between receiver and main control unit, simultaneously for completing information transfer transmission, and provides remote power feeding for receiver.
Receiver unit is for the multichannel simultaneous observation of multi-receiver, and the Full wave shape collection of great dynamic range, sampling with high precision data, adopts hardware low-pass filtering and notch filter technology to suppress the interference of given frequency noise to useful signal, improves signal to noise ratio (S/N ratio); The high-precision power that adopts low ripple noise is mimic channel power supply, and Digital and analog power supply is wiring separately; Adopt shielding and earthing method, eliminate common-mode noise, avoid noise coupling in loop.
Fig. 4 has shown the distributed IP of time domain receiving trap implementation method process flow diagram of the preferred embodiment of the present invention.
As shown in Figure 4, the distributed IP of time domain receiving trap implementation method that the present invention proposes can be divided into following steps:
Step S1, the interelectrode potential difference signal of conditioning receiver a minute two-way are delivered to respectively pre-sampling ADC and gain-programmed amplifier PGA, wherein adopt 12 8 passage ADC to complete simulating signal to the slightly sampling for the first time of digital signal.
Step S2, the simultaneously pre-sampling ADC of receiver channel completes the thick sampling at a high speed for the first time of bipolar signal, after digitizing, by FPGA in-line coding module, dynamically generate the instantaneous gain of PGA, exponent as floating data is cached in the inner FIFO of FPGA, wherein adopts 12 8 passage ADC to complete simulating signal to the slightly sampling for the first time of digital signal.
Step S3, simulating signal after amplification drops on half range of rear class ADC between full scale, by rear class high precision while sampling ADC, carry out meticulous sampling for the second time, its transformation result is cached in the inside FIFO of FPGA as the mantissa of floating data, wherein adopt 24 8 passage ADC to complete meticulous sampling for the second time.
Step S4, measured signal is after transient floating point amplifies, and exponent and mantissa's two parts form AD transformation result, and wherein measured signal is after transient floating point amplifies, exponent and mantissa's two parts form AD transformation result, and now receiver range of dynamic measurement DR as shown in Equation 1.
Step S5, number leaflet unit realizes the total line length distance wired of RS485 high-speed transfer by Shielded Twisted Pair.
Step S6, main control unit is collected receiver data and is carried out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, storing data files, realizes follow-up indoor fine data and processes.
Fig. 5 has shown the distributed IP of time domain receiving trap implementation method process flow diagram of the optional embodiment of the present invention.
As shown in Figure 5, the distributed IP of time domain receiving trap implementation method that the present invention proposes, on the basis of preferred embodiment, has increased optional step S7, specifically can be divided into following steps:
Step S1, the interelectrode potential difference signal of conditioning receiver a minute two-way are delivered to respectively pre-sampling ADC and gain-programmed amplifier PGA, wherein adopt 12 8 passage ADC to complete simulating signal to the slightly sampling for the first time of digital signal.
Step S2, the simultaneously pre-sampling ADC of receiver channel completes the thick sampling at a high speed for the first time of bipolar signal, after digitizing, by FPGA in-line coding module, dynamically generate the instantaneous gain of PGA, exponent as floating data is cached in the inner FIFO of FPGA, wherein adopts 12 8 passage ADC to complete simulating signal to the slightly sampling for the first time of digital signal.
Step S3, simulating signal after amplification drops on half range of rear class ADC between full scale, by rear class high precision while sampling ADC, carry out meticulous sampling for the second time, its transformation result is cached in the inside FIFO of FPGA as the mantissa of floating data, wherein adopt 24 8 passage ADC to complete meticulous sampling for the second time.
Step S4, measured signal is after transient floating point amplifies, and exponent and mantissa's two parts form AD transformation result, and wherein measured signal is after transient floating point amplifies, exponent and mantissa's two parts form AD transformation result, and now receiver range of dynamic measurement DR as shown in Equation 1.
Step S5, number leaflet unit realizes the total line length distance wired of RS485 high-speed transfer by Shielded Twisted Pair.
Step S6, main control unit is collected receiver data and is carried out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, storing data files, realizes follow-up indoor fine data and processes.
Step S7, main control unit sends warning information after abnormal data being detected, to operating personnel, provides reference.
Should be understood that, above-mentioned embodiment of the present invention is only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore any modification of, making, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in without departing from the spirit and scope of the present invention in the situation that.In addition, claims of the present invention are intended to contain whole variations and the modification in the equivalents that falls into claims scope and border or this scope and border.
Claims (10)
1. a distributed IP of time domain receiving trap, comprises main control unit, number leaflet unit and receiver unit, it is characterized in that:
Described main control unit is used for collecting receiver data and carries out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, and storing data files, realizes follow-up indoor fine data and processes;
The first long distance wired high-speed transfer for data after processing between receiver and main control unit of described several leaflet;
Described receiver unit is for the multichannel simultaneous observation of multi-receiver, the Full wave shape collection of great dynamic range, sampling with high precision data.
2. distributed IP of time domain receiving trap according to claim 1, is characterized in that, described main control unit utilizes Ethernet or WIFI and number leaflet unit interconnected, with wired mode, connects a plurality of multichannel receivers.
3. distributed IP of time domain receiving trap according to claim 1, is characterized in that, described main control unit, for the useful signal of the number leaflet unit transmission that superposes, improves the signal to noise ratio (S/N ratio) that receives signal.
4. distributed IP of time domain receiving trap according to claim 1, is characterized in that, described several leaflet unit has been used for information transfer transmission, and provides remote power feeding for a plurality of receivers.
5. distributed IP of time domain receiving trap according to claim 1, is characterized in that, described receiver unit adopts hardware low-pass filtering and notch filter technology to suppress the interference of given frequency noise to useful signal, improves signal to noise ratio (S/N ratio).
6. distributed IP of time domain receiving trap according to claim 1, is characterized in that, it is mimic channel power supply that described receiver unit adopts the high-precision power of low ripple noise, and Digital and analog power supply is wiring separately.
7. distributed IP of time domain receiving trap according to claim 1, is characterized in that, described receiver unit adopts shielding and earthing method, eliminates common-mode noise, avoids noise coupling in loop.
8. a distributed IP of time domain receiving trap implementation method, described method comprises the steps:
Step S1, the interelectrode potential difference signal of conditioning receiver a minute two-way are delivered to respectively pre-sampling ADC and gain-programmed amplifier PGA;
Step S2, receiver channel simultaneously pre-sampling ADC completes the thick sampling at a high speed for the first time of bipolar signal, dynamically generates the instantaneous gain of PGA after digitizing by FPGA in-line coding module, as the exponent of floating data, is cached in the inner FIFO of FPGA;
Step S3, the simulating signal after amplification drops on half range of rear class ADC between full scale, by rear class high precision while sampling ADC, carries out meticulous sampling for the second time, and its transformation result is cached in the inside FIFO of FPGA as the mantissa of floating data;
Step S4, measured signal is after transient floating point amplifies, and exponent and mantissa's two parts form AD transformation result;
Step S5, number leaflet unit realizes the total line length distance wired of RS485 high-speed transfer by Shielded Twisted Pair;
Step S6, main control unit is collected receiver data and is carried out pre-service and one-tenth figure demonstration, the real-time working state of while monitoring receiver, storing data files, realizes follow-up indoor fine data and processes.
9. distributed IP of time domain receiving trap implementation method according to claim 6, is characterized in that, in described step S1 and S2, adopts 12 8 passage ADC to complete simulating signal to the slightly sampling for the first time of digital signal.
10. distributed IP of time domain receiving trap implementation method according to claim 6, is characterized in that, in described step S3, adopts 24 8 passage ADC to complete meticulous sampling for the second time.
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| CN104155696B (en) | 2016-10-05 |
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