CN212110512U - Quick detection device in area is let out to channel - Google Patents
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- CN212110512U CN212110512U CN202021238599.XU CN202021238599U CN212110512U CN 212110512 U CN212110512 U CN 212110512U CN 202021238599 U CN202021238599 U CN 202021238599U CN 212110512 U CN212110512 U CN 212110512U
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Abstract
The utility model discloses a quick detection device in area is let out to channel. The device of the utility model mainly comprises a signal sending system and a signal receiving system which are respectively provided with a GPS synchronous interface; the signal sending system comprises a single chip microcomputer, a constant current source module, a current limiting adjustment module, a load constant current output module, a signal output electrode A pole and a signal output electrode B pole, an FPGA module, a display module, a waveform recording module and a synchronization module; the signal receiving system comprises a singlechip, a signal input electrode M pole and N pole, a preamplifier circuit, a filter circuit, a program control amplifier circuit, an analog-to-digital conversion circuit (AD, FIFO memory), a DSP module, a communication interface circuit and a display interfaceThe device comprises a circuit, a waveform recording module and a synchronization module. The method of the present invention is by establishing 10‑2‑103The stable current field source of the Hz frequency group, and the observation data information comprises: and recording the position GPS three-dimensional data and multi-path collected ground electric field signals to form a ground electric section diagram with the channel being 50 meters shallow.
Description
Technical Field
The utility model belongs to the technical field of solid geophysics, concretely relates to quick detection device in area is let out to channel.
Background
The channels excavated and built manually are narrow, long and regular in general. The channel is used for generally serving industrial, agricultural or environmental engineering, channels on the ground are mostly open channels, and unnecessary loss is caused by leakage caused by influences of weathering, material fatigue and geological action after a certain service life, so that the work schedule is losslessly, quickly and accurately detected.
The current geophysical methods for leak detection can be classified into electrical methods, electromagnetic methods, seismic methods, and the like. In the electrical method, no matter the electrical depth, the electrical profile or the high-density electrical method, the core of the electrical method is based on the geometric dimension, and a continuous and fine dam body and a resistivity continuous distribution structure chart of a dam body peripheral medium cannot be obtained. The electromagnetic method is subdivided into a conduction type electromagnetic method and an induction type electromagnetic method, and whether the conduction type electromagnetic method or the induction type electromagnetic method is limited by a principle and a device, leakage points of a channel dam body under the condition of continuous flow cannot be finely detected; the geological radar does not need electrode grounding, although the speed is high, effective work is difficult to carry out under the condition of no flow interruption; the traditional seismic method needs a grounding sensor, so that the detection speed is low, and the requirement of hidden danger detection is difficult to meet. The method is generally used for leakage detection of piping of rivers and reservoir dams, an electric field needs to be established between a water outlet point on the back water side of a leakage area and water in a reservoir area, and the method is not suitable for detection of leakage points of channels with relatively small sizes. Therefore, a new method and a device for nondestructive, rapid and accurate detection of leakage points of long, narrow and regular channels, which are suitable for artificial excavation and construction, under the condition of no continuous flow are needed.
Disclosure of Invention
An object of the utility model is to the above-mentioned defect that exists among the prior art, provide a be applicable to the manual excavation build, long and narrow, regular channel leak the quick detection device in region.
The utility model discloses a channel leakage area rapid detection device, which comprises two independent systems of a signal sending system and a signal receiving system, wherein the signal sending system and the signal receiving system are respectively provided with a GPS synchronous interface; the signal sending system comprises a single chip microcomputer, a constant current source module, a current limiting adjustment module, a load constant current output module, a signal output electrode A pole and a signal output electrode B pole which are sequentially connected, and a frequency signal generating module, namely an FPGA module, a display module, a waveform recording module and a synchronization module; the GPS synchronous interface is connected with the synchronous module; the method comprises the following steps of connecting and controlling a display module, a waveform recording module and a storage state at the same time by taking a singlechip Microcontroller (MCU) as a center, connecting and controlling a synchronization module and a FPGA module at the same time, and connecting and controlling the FPGA module and the FPGA module at the same time; after a signal sequence generated by the FPGA is subjected to unipolar waveform changing into bipolar waveform, a constant current source module is subjected to voltage following and voltage-current conversion to form a continuously adjustable constant current source signal required for observation, and finally a load current-limiting output module outputs bipolar frequency signals to an A pole and a B pole;
the signal receiving system comprises a single chip microcomputer, a signal input electrode M pole and an N pole, a preamplifier circuit, a filter circuit, a program control amplifier circuit, an analog-to-digital conversion circuit (AD), a first-in first-out data buffer (FIFO memory), a Digital Signal Processor (DSP) module, a communication interface circuit, a display interface circuit, a waveform recording module and a synchronization module which are sequentially connected; the GPS synchronous interface is connected with the synchronous module; the communication interface circuit can communicate with the PC, and the display interface circuit is connected with the display module to monitor the working state of the signal receiving system; the program control amplifying circuit is also connected with a singlechip Microcomputer Controller (MCU), the analog-to-digital conversion circuit is also connected with the DSP module, and the MCU is also connected with the FIFO memory, the DSP module, the communication interface circuit, the display interface circuit, the waveform recording module and the synchronization module;
the signal transmitting system and the signal receiving system are both arranged on the water surface carrier; the A pole and the B pole of the signal output electrode and the M pole and the N pole of the signal input electrode are paired electrodes; i pairs of signal input electrodes M poles and N poles are arranged at equal intervals according to the width of the channel, and the M poles and the N poles are installed on a stable water surface carrier with corresponding size, wherein i is greater than 1 or i is equal to 1; the A pole and the B pole of the signal output electrode are respectively positioned at the outer sides of the M pole and the N pole of the signal input electrode at equal intervals; the signal transmitting system, the signal receiving system, the signal output electrode and the signal input electrode of the signal transmitting system and the signal receiving system move along with the water surface carrier along the channel direction.
The working principle of the signal receiving system of the utility model is that the signal input electrode M, N obtains potential difference signals, and the signal is amplified by the program control amplifier controlled by the MCU after the pre-amplification and the filtering treatment; after the program-controlled amplified output signal is sent to AD digitization, the data is divided into two paths for processing: (1) after the DSP carries out preliminary calculation, the MCU carries out display through a communication interface; (2) after entering FIFO, waveform recording is carried out in an external memory of a receiving system; meanwhile, the data is processed by a PC through the communication interface.
The use method of the rapid detection device based on the channel leakage area comprises the following steps:
(1) firstly, completing the resistivity measurement work of detecting a channel water body, sediments and a channel peripheral soil body, thereby quantifying the resistivity of each medium in the channel and determining the geometric dimensions of a transmitting frequency group, a signal transmitting system and a signal receiving system of the signal transmitting system according to the quantified indexes and the detection requirements;
(2) placing and fixing a signal sending system, a signal receiving system, a signal output electrode and a signal input electrode on a water surface carrier, and measuring the geometric dimensions of the signal output electrode and the signal output electrode;
(3) calculating the inductance according to the geometric dimension, and defining the action areas of the conduction field and the induction field;
(4) the instrument is started and preheated for 15 minutes, and the synchronization of the signal sending system and the signal receiving system is completed;
(5) adjusting the current value of the adjustable constant current source of the signal sending system to ensure that the signal field source established by the signal sending system is relatively constant;
(6) selecting a known channel, performing experimental observation work according to the preliminarily determined working parameters, modifying the parameter values in the work of the steps (1) to (5) through an experimental measurement result, performing the experimental work again, and finally determining the working parameters;
(7) and the observation work is carried out along the channel direction or the observation is carried out in the direction vertical to the channel direction under the limitation of the geometric dimension of the channel.
Further, the signal transmission system generates 7 th order 4 frequency group signals in the form of a combined waveform based on the inverse repeating m-sequence pseudo-random signal: 1 frequency group 0.01Hz-1 Hz; 2 frequency groups are 0.1Hz-10 Hz; the 3 frequency groups are 10Hz-100 Hz; 4, a frequency group is 100Hz-1 KHz; the frequency groups are selectable; during operation, selection is carried out according to the liquid resistivity parameter characteristics in the channel and the detection requirements, and one frequency group or a plurality of frequency group sequence signals are determined to be used as working frequency groups to be sent and received. The method meets the requirement of an observation frequency table for rapid and nondestructive detection of channel leakage points under the condition that fresh water to brine in the channel is not in continuous flow.
Further, the transmission current of the signal transmission system is adjusted within the range of 0.1A to 10A, and the coded waveform is transmitted in a constant current mode. So as to be suitable for the conductivity difference of conductive liquids (water bodies in the channels) with different properties.
Furthermore, the signal receiving system performs waveform acquisition of time series signals after adopting pre-amplification, and a display module connected with a display interface circuit monitors the working state of the receiving system; the signal receiving system stores the acquired waveform data in real time, and the signal sending system records the sent waveform and the real-time current information in real time.
Furthermore, the signal transmission system encodes 7-order 4 code elements to form a transmission waveform, determines a frequency group and a transmission current according to the water resistivity parameter and the detection requirement to transmit, and can regenerate different code element frequency signal sequences of other orders according to the water resistivity data in the channel, the channel dam body and the stratum resistivity data outside the channel obtained by field on-site experiment observation so as to complete the detection task by more reasonably observing the parameters.
Further, field source signals established by the signal output electrodes A and B as transmitting electrodes are received by adopting 1 or more pairs of signal input electrodes M and N, the device moves along with the water surface carrier, the electrical parameter information of the continuous medium below the channel is acquired, and the position of the leakage point is determined by combining the position information acquired by the GPS.
The utility model discloses a signal transmission system adopts pseudo-random code division multiple access principle, divides 4 frequency groups to produce frequency 10-2H to 103Forming a frequency domain sounding frequency table by the Hz combined waveform signal; establishing a stable detection field source by adopting an adjustable constant current source current output scheme; the signal receiving system consists of a signal recording system and a signal receiving system working state monitor, and the receiving system and the transmitting system acquire real-time waveform data in a multipath manner on the basis of GPS synchronization and acquire response signals continuously at a high speed. The signal transmission system records information such as time, transmission waveform, output current and the like; and the signal receiving system stores the acquired waveform data in real time. The utility model discloses an establish 10-2-103A plurality of selectable frequency groups of stable current field sources in the Hz range, the observed data information comprising: and recording position GPS position information and multi-path collected earth electric field signals to form earth electric information of a shallow channel of 50 meters. Therefore, the leakage point position can be judged quickly and nondestructively, and the accuracy is high.
Drawings
Fig. 1 is a measurement schematic block diagram of an apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of a channel leakage point structure according to an embodiment of the present invention.
Fig. 3 is a schematic view of channel resistivity stratification according to an embodiment of the present invention.
Fig. 4 is a waveform diagram of the transmission when the seventh order fc is 2.54Hz according to the embodiment of the present invention.
Fig. 5 is a waveform diagram of the transmission when the seventh order fc is 25.4Hz according to the embodiment of the present invention.
Fig. 6 is a waveform diagram of the transmission when fc is 254 Hz.
Fig. 7 is a diagram of a transmission waveform when fc is 2540Hz in the seventh order according to the embodiment of the present invention.
Fig. 8 is a circuit diagram of unipolar-bipolar conversion of a frequency signal according to an embodiment of the present invention.
Fig. 9 is a circuit diagram of a constant current source module according to an embodiment of the present invention.
Fig. 10 is a circuit diagram of the output current monitoring circuit according to the embodiment of the present invention.
Fig. 11 is a circuit diagram of a preamplifier according to an embodiment of the present invention.
Fig. 12 is a filter circuit diagram according to an embodiment of the present invention.
Fig. 13 is a circuit diagram of the programmable amplifying circuit according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the utility model discloses a channel leakage area rapid detection device, it includes signal transmission system 1 and signal receiving system 2 two independent systems based on the control of respective master control unit, signal transmission system 1 and signal receiving system 2 have GPS synchronous interface respectively; as can be seen from fig. 1, the signal transmission system 1 includes a single chip microcomputer, and a constant current source module, a current limiting adjustment module, a load constant current output module, a signal output electrode a pole and a signal output electrode B pole which are connected in sequence, and also includes a frequency signal generation module, i.e., an FPGA module, a display module, a waveform recording module and a synchronization module; the GPS synchronous interface is connected with the synchronous module; the method comprises the following steps of connecting and controlling a display module, a waveform recording module and a storage state at the same time by taking a singlechip Microcontroller (MCU) as a center, connecting and controlling a synchronization module and a FPGA module at the same time, and connecting and controlling the FPGA module and the FPGA module at the same time; after a signal sequence generated by the FPGA is subjected to unipolar waveform changing into bipolar waveform, a constant current source module is subjected to voltage following and voltage-current conversion to form a continuously adjustable constant current source signal required for observation, and finally a load current-limiting output module outputs bipolar frequency signals to an A pole and a B pole; fig. 1 and 3 show channels.
The signal receiving system 2 comprises a singlechip, a signal input electrode M pole and an N pole, a preamplifier circuit, a filter circuit, a program control amplifier circuit, an analog-to-digital conversion circuit (AD), a first-in first-out data buffer (FIFO memory), a Digital Signal Processor (DSP) module, a communication interface circuit, a display interface circuit, a waveform recording module and a synchronization module which are sequentially connected; the GPS synchronous interface is connected with the synchronous module; the communication interface circuit can be in contact with a PC (personal computer), and the display interface circuit is connected with the display module to monitor the working state of the signal receiving system; the program control amplifying circuit is also connected with a singlechip Microcomputer Controller (MCU), the analog-to-digital conversion circuit is also connected with the DSP module, and the MCU is also connected with the FIFO memory, the DSP module, the communication interface circuit, the display interface circuit, the waveform recording module and the synchronization module.
The signal transmitting system 1 and the signal receiving system 2 are both arranged on a water surface carrier; the A pole and the B pole of the signal output electrode and the M pole and the N pole of the signal input electrode are paired electrodes; i pairs of signal input electrodes M poles and N poles are arranged at equal intervals according to the width of the channel, and the M poles and the N poles are installed on a stable water surface carrier with corresponding size, wherein i is greater than 1 or i is equal to 1; the A pole and the B pole of the signal output electrode are respectively positioned at the outer sides of the M pole and the N pole of the signal input electrode at equal intervals; the signal transmitting system 1, the signal receiving system 2, the signal output electrode and the signal input electrode of the signal transmitting system and the signal receiving system move along with the water surface carrier along the channel direction.
The utility model discloses a to the actual need that the channel carries out the leakage point under the condition of not having flowed to experimental data on the spot is for supporting many times, on the basis of making clear and definite and surveying target and target area underground medium electrical parameter distribution rule, proposes the multifrequency combination wave of reverse repetition m sequence coding as the signal carrier, and constant current mode output 0.1A-10A electric current forms stable frequency domain current field source. The utility model discloses the device sends the coding sequence and is 7 order sequence signals in the reverse repetition m sequence of pseudorandom, and 4 that the code element frequency fc produced is 2.54Hz, 25.4Hz, 254Hz, 2540Hz are organized optionally frequently, select the frequency group of the pseudorandom sequence coding that the code element fc formed according to different nature water resistivity, survey the requirement, finally reach: (1) a correspondingly low frequency is formed for ensuring the detection depth; (2) setting the current-limiting current of a sending system according to the resistivity characteristics of the water body and the signal pickup capacity; (3) the dynamic range and the measured data quality of the observation system are ensured through current limiting; (4) frequency points with enough density are generated by the coded signals of the inverse repeated m sequences, and the fine resolution of the underground medium is ensured.
Referring to fig. 2 and fig. 3, the structure and resistivity stratification of the channel leak point is shown, wherein 31 denotes a dam, 32 denotes a water body, 33 denotes a sediment, 34 denotes a leak point, and 35 denotes a void. According to the data shown in figures 1 and 2 and experiments, it is shown that: (1) if the liquid is fresh water, taking a certain irrigation canal in the south as an example, the resistivity of the water body is about 80 omega m; the sediment resistivity is generally caused by the deposition of particles and turbulances carried by water and particles moved along with wind, the sediment contains a large amount of organic matters, and the field experiment value is 10-20 omega m; the resistivity of a region affected by leakage of the substrate is about 30 omega m, and the resistivity of a region not affected by leakage is 40-50 omega m; (2) if the liquid is brine, taking a certain sylvite mine brine liquid as an example, the brine resistivity is only 0.2-0.3 omega m, the sediment in the channel is generally salt precipitated from the brine, and is influenced by the non-cutoff of the channel, the crystallized salt precipitated from the brine in the channel does not form a salt shell and is in a molten state, the sediment resistivity is 1-2 omega m, and the substrate is 3-4 omega m. However, the dam body of the water channel is correspondingly hardened (seepage-proofing), the resistivity of the dam body is different from the resistivity of the water body, sediment and the fourth series of substances outside the dam body in the environment by orders of magnitude and is far larger than that of other media, if the dam body is damaged and leaked, the water body in the channel is communicated with the soil body outside the channel, and the resistivity of the leakage position is equal to the resistivity of the water body. The results of the field experiments of the two dam bodies show that: the abnormal field and the background field have great difference, and the precondition for detecting by an electrical method exists.
Table 1 shows a frequency table generated by a seven-order pseudo-random inverse repeating m-sequence 4-frequency group signal.
TABLE 1 frequency table for generating seven-order pseudo-random inverse-repeat m-sequence 4-frequency group signal
In the table, n-7 is the order; fc/Hz is code element, and the unit is Hz; 2.54, 25.4, 254, 2540, 25400 are symbol frequencies. Encoded by 7 orders of pseudo-random inverse repetition m sequence, selectively generated and transmitted in 4 frequency groups.
The propagation distance of the signal emitted by the signal output electrode is the skin depth:
wherein, sigma is the conductivity and the unit is S/m; μ is the permeability, in units of H/m; omega is angular frequency, unit is rad/m; f is the signal frequency in Hz.
From the above formula, as the signal frequency increases, the skin depth decreases, the attenuation of the electromagnetic interference signal in the water body is accelerated, and the signal-to-noise ratio also increases.
In order to prevent the situation that detection data with enough depth cannot be acquired due to the fact that the signal attenuation speed is too high, a heavy salinization area is one of extreme conditions of channel detection work, and a 1-frequency group is designed, namely 0.01Hz-1.11 Hz; simultaneously, in order to prevent to lead to can not finely distinguish shallow earth's surface electrical structure in the regional work of non-heavy salinization too low frequency, designed 4 frequency groups, promptly: 10Hz-1110 Hz. Additionally, the embodiment of the utility model provides a send and receiving arrangement has remain the download interface, still can download the higher frequency group frequently according to actual need to guarantee dam body leakage area and survey the needs.
Referring to fig. 4, a time waveform when the pseudo-random inverse m-sequence symbol (fc) is 2.54 in the present embodiment is transmitted with an order of 100 seconds, defined as 1 frequency group, and the cover frequency is: 0.01-1.11 Hz.
Referring to fig. 5, a time waveform when the pseudo-random inverse m-sequence symbol (fc) is 25.4 in this embodiment is sent with an order of 10 seconds, defined as 2 frequency groups, and the cover frequency is: 1Hz-11.1 Hz.
Referring to fig. 6, a time waveform when the pseudo-random inverse m-sequence symbol (fc) is 254 in this embodiment is sent with an order of 1 second, defined as 3 frequency groups, and the cover frequency is: 10Hz-111 Hz.
Referring to fig. 7, a time waveform when the pseudo-random inverse m-sequence symbol (fc) is 2540 in this embodiment is sent with an order of 0.1 seconds, which is defined as 4 frequency groups, and the cover frequency is: 10Hz-1110 Hz.
Referring to fig. 8, a unipolar-bipolar conversion circuit diagram of the frequency signal of the present embodiment is shown. As shown in fig. 8, the 3 rd pin of the dual-way comparator U4 is connected to a pseudo random Signal generated from the FPGA, the 2 nd pin is connected to +1.25, the 4 th pin is connected to a-4.096V power supply terminal, the 1 st pin is connected to the lower end of R6, and is connected to the 1 st and 2 nd pins of the P2 patch socket; the upper end of the R6 is connected with the 3 rd pin of the P1 patch socket, the 2 nd pin of the P1 is the output end of the bipolar pseudo-random signal, the 1 st pin of the P1 is connected with the ground, the 3 rd pin of the P2 is connected with the 8 th pin of the two-way comparator U4, and is connected with the +4.096 power supply end. The P1 and P2 sockets are respectively externally connected with a group of potentiometers to adjust the amplitude intensity of the output pseudo-random signal.
Referring to fig. 9, a circuit diagram of the constant current source module of the present embodiment is shown. As can be seen from fig. 9, U1, U2, U3 are all operational amplifiers. A 3 rd pin of the U1 is connected with a bipolar pseudo-random signal, a 4 th pin is connected with a-15V power supply, a 2 nd pin is connected with a 6 th pin and then connected with the left end of the R2, and a 7 th pin is connected with a +15V power supply; the right end of the R2 is respectively connected with the 3 rd pin of the U2 and the left end of the R4; a 4 th pin of the U2 is connected with a-15V power supply, a 2 nd pin is connected with the right end of the R1 and the left end of the R3, the left end of the R1 is grounded, a 6 th pin is connected with the right end of the R3 and the left end of the R5, and a 7 th pin is connected with the +15V power supply; the 4 th pin of the U3 is connected with a-15V power supply, the 7 th pin is connected with a +15V power supply, the right end of the R4 is respectively connected with the 6 th pin and the 2 nd pin of the U3, and the 3 rd pin of the U3 is connected with the right end of the R5 to form an output. The voltage signals with different amplitudes generated by the circuit diagram of fig. 8 pass through the U1 operational amplifier to complete voltage following, and the U2 and U3 operational amplifiers complete voltage-current conversion to realize constant output current signals. The monitoring of the output current value is realized by the circuit of fig. 10.
Referring to fig. 10, an output current monitoring circuit diagram of the present embodiment is shown. As shown in fig. 10, the 2 nd pin of U5 is connected to the lower end of R6, the input current signal Iin is connected, the upper end of R6 is connected to the 1 st pin, the 3 rd pin is connected to ground, the 4 th pin is connected to a-5V power supply, the 8 th pin is connected to a 5V power supply, and the 6 th and 7 th pins are connected to the upper end of R8 after short-circuiting; the lower end of R8 is connected with the ground; a 5 th pin of the U6 is connected to a 7 th pin of the U5 to output a signal, and a 15 th pin and a 16 th pin are respectively connected with the singlechip and are control signals; a 13 th pin of the U6 is connected with a 5V power supply, an 8 th pin is connected with a-5V power supply, a 4 th pin is connected with the lower end of the R7, and the upper end of the R7 is connected with the ground; the 11 th pin and the 12 th pin of the U6 are connected to the 4 th pin of the U7 after being shorted; the 10 th pin is connected with the ground; the 5 th pin and the 3 rd pin of the U7 are grounded, the 8 th pin is connected with a 5V power supply, and the 2 nd pin is connected with the singlechip and is a state signal; the 1 st pin of the U7 is grounded, and the 9 th and 10 th pins are respectively connected with the lower ends of R9 and R10, and are connected with a 5V power supply through the upper ends thereof.
Monitoring the output current by the circuit shown in fig. 10, and when the output current is less than the current required by the experiment, adjusting the potentiometer values connected with the P1 and P2 connectors in fig. 8 to change the amplitude intensity of the bipolar signal; thus, the voltage signal with the changed amplitude intensity forms a constant current signal output through the voltage following and voltage-current conversion process of fig. 9; the output current is monitored by the circuit shown in fig. 10, and finally, the output constant current value is adjusted to the value required by the experiment.
Referring to fig. 11, a preamplifier circuit diagram of the present embodiment is shown. As can be seen from fig. 11, the signal is picked up by electrodes M, N. The electrode M is connected with the left end of R1, the right end of R1 is connected with the left end of C1, the right end of C1 is connected with the 3 rd pin of U1 and simultaneously connected with the lower end of R3, and the upper end of R3 is grounded; the electrode N is connected with the left end of the R2, the right end of the R2 is connected with the left end of the C2, the right end of the C2 is connected with the 2 nd pin of the U1 and is also connected with the upper end of the R4, and the lower end of the R4 is grounded; the 1 st pin of U1 is connected with the left end of R5, and the right end of R5 is connected with the 8 th pin of U1; pin 5 of U1 is grounded; the 7 th pin of U1 is connected with the right end of R6, and the left end of R6 is connected with a power supply VCC; the 4 th pin of U1 is connected with the left end of R7, and the right end of R7 is connected with a power supply VEE; pin 6 of U1 is the output signal pin. The pre-amplifying circuit completes pre-amplification and then sends the pre-amplified signal to the filter circuit for processing.
Referring to fig. 12, a filter circuit diagram of the present embodiment is shown. As can be seen from FIG. 12, the pre-amplified signal is connected to the left end of R7, and the right end of R7 is connected to the left end of R8 and the lower end of C3; the right end of the R8 is connected with the upper end of the C4 and is connected with the in-phase end of the U2; the lower end of the C4 is grounded; the inverting terminal of the U2 and the upper end of the C3 are connected with the 6 th pin of the U2 to form the output terminal of the filter circuit; pin 4 of U2 is connected to a power supply VEE and pin 7 of U2 is connected to a power supply VCC.
Fig. 13 is a circuit diagram of the programmable amplifier of the present embodiment. As can be seen from fig. 13, the filtered signal is connected to pin 4 of U4, and pin 5 of U4 is grounded; a pin 8 of the U4 is connected with a power supply VEE, pins 15 and 16 are respectively connected with control signals choose4 and choose3, a pin 14 is grounded, and a pin 13 is connected with a power supply VCC; the 12 th pin is connected with the left end of the R15, and the 11 th pin is connected with the right end of the R15 to form an output end; the 10 th pin is grounded.
Claims (7)
1. The utility model provides a quick detection device in area is let out to channel which characterized in that: the system comprises a signal sending system (1) and a signal receiving system (2), wherein the signal sending system (1) and the signal receiving system (2) are respectively provided with a GPS synchronous interface; the signal sending system (1) comprises a single chip microcomputer, a constant current source module, a current limiting adjustment module, a load constant current output module, a signal output electrode A pole and a signal output electrode B pole which are sequentially connected, and a frequency signal generating module, namely an FPGA module, a display module, a waveform recording module and a synchronization module; the GPS synchronous interface is connected with the synchronous module; the method comprises the following steps of connecting and controlling a display module, a waveform recording module and a storage state at the same time by taking a singlechip Microcontroller (MCU) as a center, connecting and controlling a synchronization module and a FPGA module at the same time, and connecting and controlling the FPGA module and the FPGA module at the same time; after a signal sequence generated by the FPGA is subjected to unipolar waveform changing into bipolar waveform, a constant current source module is subjected to voltage following and voltage-current conversion to form a continuously adjustable constant current source signal required for observation, and finally a load current-limiting output module outputs bipolar frequency signals to an A pole and a B pole;
the signal receiving system (2) comprises a singlechip, a signal input electrode M pole and an N pole, a preamplifier circuit, a filter circuit, a program control amplifier circuit, an analog-to-digital conversion circuit (AD), a first-in first-out data buffer (FIFO memory), a Digital Signal Processor (DSP) module, a communication interface circuit, a display interface circuit, a waveform recording module and a synchronization module which are sequentially connected; the GPS synchronous interface is connected with the synchronous module; the communication interface circuit can communicate with the PC, and the display interface circuit is connected with the display module to monitor the working state of the signal receiving system; the program control amplifying circuit is also connected with a singlechip Microcomputer Controller (MCU), the analog-to-digital conversion circuit is also connected with the DSP module, and the MCU is also connected with the FIFO memory, the DSP module, the communication interface circuit, the display interface circuit, the waveform recording module and the synchronization module;
the signal transmitting system (1) and the signal receiving system (2) are both arranged on a water surface carrier; the A pole and the B pole of the signal output electrode and the M pole and the N pole of the signal input electrode are paired electrodes; i pairs of signal input electrodes M poles and N poles are arranged at equal intervals according to the width of the channel, and the M poles and the N poles are installed on a stable water surface carrier with corresponding size, wherein i is greater than 1 or i is equal to 1; the A pole and the B pole of the signal output electrode are respectively positioned at the outer sides of the M pole and the N pole of the signal input electrode at equal intervals; the signal transmitting system (1), the signal receiving system (2) and the signal output electrode and the signal input electrode thereof move along with the water surface carrier along the channel direction.
2. The channel leakage area rapid detection device of claim 1, wherein: the unipolar-bipolar conversion circuit of the frequency Signal is characterized in that a 3 rd pin of a double-way comparator U4 is connected with a pseudo-random Signal generated from an FPGA, a 2 nd pin is connected with +1.25, a 4 th pin is connected with a-4.096V power supply end, a 1 st pin is connected with the lower end of R6 and is simultaneously connected with a 1 st pin and a 2 nd pin of a P2 patch port; the upper end of the R6 is connected with the 3 rd pin of the P1 patch socket, the 2 nd pin of the P1 is the output end of the bipolar pseudo-random signal, the 1 st pin of the P1 is connected with the ground, the 3 rd pin of the P2 is connected with the 8 th pin of the two-way comparator U4 and is also connected with the +4.096 power supply end; the P1 and P2 sockets are respectively externally connected with a group of potentiometers to adjust the amplitude intensity of the output pseudo-random signal.
3. The channel leakage area rapid detection device of claim 2, wherein: the constant current source module circuit is characterized in that U1, U2 and U3 are operational amplifiers, a 3 rd pin of U1 is connected with a bipolar pseudo-random signal, a 4 th pin is connected with a-15V power supply, a 2 nd pin is connected with a 6 th pin and then connected with the left end of R2, and a 7 th pin is connected with a +15V power supply; the right end of the R2 is respectively connected with the 3 rd pin of the U2 and the left end of the R4; a 4 th pin of the U2 is connected with a-15V power supply, a 2 nd pin is connected with the right end of the R1 and the left end of the R3, the left end of the R1 is grounded, a 6 th pin is connected with the right end of the R3 and the left end of the R5, and a 7 th pin is connected with the +15V power supply; the 4 th pin of the U3 is connected with a-15V power supply, the 7 th pin is connected with a +15V power supply, the right end of the R4 is respectively connected with the 6 th pin and the 2 nd pin of the U3, and the 3 rd pin of the U3 is connected with the right end of the R5 to form an output.
4. The channel leakage area rapid detection device of claim 3, wherein: the output current monitoring circuit is characterized in that a 2 nd pin of U5 is connected with the lower end of R6, a current signal Iin is accessed, the upper end of R6 is connected with a 1 st pin, a 3 rd pin is connected with the ground, a 4 th pin is accessed to a-5V power supply, an 8 th pin is accessed to a 5V power supply, and a 6 th pin and a 7 th pin are connected with the upper end of R8 after being short-circuited; the lower end of R8 is connected with the ground; a 5 th pin of the U6 is connected to a 7 th pin of the U5 to output a signal, and a 15 th pin and a 16 th pin are respectively connected with the singlechip and are control signals; a 13 th pin of the U6 is connected with a 5V power supply, an 8 th pin is connected with a-5V power supply, a 4 th pin is connected with the lower end of the R7, and the upper end of the R7 is connected with the ground; the 11 th pin and the 12 th pin of the U6 are connected to the 4 th pin of the U7 after being shorted; the 10 th pin is connected with the ground; the 5 th pin and the 3 rd pin of the U7 are grounded, the 8 th pin is connected with a 5V power supply, and the 2 nd pin is connected with the singlechip and is a state signal; the 1 st pin of the U7 is grounded, and the 9 th and 10 th pins are respectively connected with the lower ends of R9 and R10, and are connected with a 5V power supply through the upper ends thereof.
5. The channel leakage area rapid detection device of claim 4, wherein: the pre-amplification circuit is used for picking up signals by an electrode M and an electrode N; the electrode M is connected with the left end of R1, the right end of R1 is connected with the left end of C1, the right end of C1 is connected with the 3 rd pin of U1 and simultaneously connected with the lower end of R3, and the upper end of R3 is grounded; the electrode N is connected with the left end of the R2, the right end of the R2 is connected with the left end of the C2, the right end of the C2 is connected with the 2 nd pin of the U1 and is also connected with the upper end of the R4, and the lower end of the R4 is grounded; the 1 st pin of U1 is connected with the left end of R5, and the right end of R5 is connected with the 8 th pin of U1; pin 5 of U1 is grounded; the 7 th pin of U1 is connected with the right end of R6, and the left end of R6 is connected with a power supply VCC; the 4 th pin of U1 is connected with the left end of R7, and the right end of R7 is connected with a power supply VEE; the 6 th pin of U1 is an output signal pin; the pre-amplifying circuit completes pre-amplification and then sends the pre-amplified signal to the filter circuit for processing.
6. The channel leakage area rapid detection device of claim 5, wherein: the filter circuit is that a pre-amplification signal is connected to the left end of R7, and the right end of R7 is connected with the left end of R8 and the lower end of C3; the right end of the R8 is connected with the upper end of the C4 and is connected with the in-phase end of the U2; the lower end of the C4 is grounded; the inverting terminal of the U2 and the upper end of the C3 are connected with the 6 th pin of the U2 to form the output terminal of the filter circuit; pin 4 of U2 is connected to a power supply VEE and pin 7 of U2 is connected to a power supply VCC.
7. The channel leakage area rapid detection device of claim 6, wherein: the program control amplifying circuit is characterized in that a filtered signal is connected to a 4 th pin of U4, and a 5 th pin of U4 is grounded; a pin 8 of the U4 is connected with a power supply VEE, pins 15 and 16 are respectively connected with control signals choose4 and choose3, a pin 14 is grounded, and a pin 13 is connected with a power supply VCC; the 12 th pin is connected with the left end of the R15, and the 11 th pin is connected with the right end of the R15 to form an output end; the 10 th pin is grounded.
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| CN202021238599.XU CN212110512U (en) | 2020-06-30 | 2020-06-30 | Quick detection device in area is let out to channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111609981A (en) * | 2020-06-30 | 2020-09-01 | 湖南科技大学 | Channel leakage area rapid detection device and use method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609981A (en) * | 2020-06-30 | 2020-09-01 | 湖南科技大学 | Channel leakage area rapid detection device and use method |
| CN111609981B (en) * | 2020-06-30 | 2024-04-12 | 湖南科技大学 | Rapid detection device for channel leakage area and use method |
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