CN216083136U - Mining dual-frequency induced polarization detection system - Google Patents
Mining dual-frequency induced polarization detection system Download PDFInfo
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- CN216083136U CN216083136U CN202122234199.2U CN202122234199U CN216083136U CN 216083136 U CN216083136 U CN 216083136U CN 202122234199 U CN202122234199 U CN 202122234199U CN 216083136 U CN216083136 U CN 216083136U
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Abstract
A mining dual-frequency induced polarization detection system comprises: a power supply unit for supplying a direct current voltage; the transmitting unit is used for boosting the direct-current voltage and converting the direct-current voltage into a detection excitation signal, boosting the direct-current voltage and converting the direct-current voltage into a calibration precision signal; the multiple groups of electrodes are connected with the sending unit and are all used for sending detection excitation signals; the receiving unit is used for receiving the calibration precision signal, carrying out synchronous calibration and receiving the detection signal and converting the detection signal into a digital detection signal; and the display control unit is respectively connected with the power supply unit, the sending unit and the receiving unit. The sending unit can directly utilize the direct-current voltage output by the power supply unit to generate a detection excitation signal and a calibration precision signal, the detection excitation signal can be used for detection, and the calibration precision signal can realize accurate synchronization after being received by the receiving unit; due to the arrangement of the multiple groups of electrodes, different working modes of the sending unit can be realized, so that the method is suitable for construction of more scenes.
Description
Technical Field
The utility model belongs to the field of underground coal mine detection, and particularly relates to a mining dual-frequency induced polarization detection system.
Background
With the development of national economy, the national demand for mineral resources is continuously increased, and the mineral resources are more and more exploited. Therefore, the detected mineral resources are mined less and less after the years, the mining depth of the detected mineral resources is deeper and deeper, the mining difficulty is higher and higher, and the difficulty of detecting the mineral resources is improved. Particularly, in the underground detection direction of the coal mine, no better detection equipment can solve the detection problem.
Aiming at the problem, an intrinsically safe dual-frequency induced polarization method based on resource exploration is provided in the market, and an instrument for realizing the dual-frequency induced polarization method has the characteristics of portability, high observation speed, strong anti-interference capability and the like, but still has the problems of poor synchronism and single test mode.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a mining dual-frequency induced polarization detection system, which solves the problems of poor synchronism and single test mode of the existing surveying instrument based on the dual-frequency induced polarization method.
The mining double-frequency induced polarization detection system according to the embodiment of the utility model comprises:
a power supply unit for supplying a direct current voltage;
the sending unit is used for boosting the direct-current voltage and converting the direct-current voltage into a detection excitation signal, and boosting the direct-current voltage and converting the direct-current voltage into a calibration precision signal;
the multiple groups of electrodes are connected with the sending unit and are all used for sending the detection excitation signals;
the receiving unit is used for receiving the calibration precision signal, carrying out synchronous calibration and receiving a detection signal and converting the detection signal into a digital detection signal;
and the display control unit is respectively connected with the power supply unit, the sending unit and the receiving unit.
The mining double-frequency induced polarization detection system provided by the embodiment of the utility model at least has the following technical effects: the working power supply can be provided for the whole mining double-frequency induced polarization detection system through the power supply unit; the transmitting unit can directly utilize the direct-current voltage output by the power supply unit to generate a detection excitation signal and a calibration precision signal, the detection excitation signal can be used for detection, and the calibration precision signal can realize accurate synchronization after being received by the receiving unit; due to the arrangement of the multiple groups of electrodes, different working modes of the sending unit can be realized, so that the method is suitable for construction of more scenes. Compared with the traditional double-frequency excitation detection instrument, the mining double-frequency excitation detection system provided by the embodiment of the utility model has a better synchronization effect, can realize more working modes, and is suitable for industrial popularization.
According to some embodiments of the utility model, the transmitting unit comprises:
the input end of the booster circuit is connected with the power supply unit and used for boosting the direct-current voltage;
the inverter circuit is provided with an inverter input end, a double-excitation output end and a calibration signal output end, the inverter input end is connected with the output end of the booster circuit, the calibration signal output end is connected with the receiving unit, and the inverter circuit is used for inverting the boosted direct-current voltage to obtain a double-excitation signal and the calibration signal;
the output electrode switching circuit is provided with a switching control end, a double-excitation input end and an emission excitation output end, wherein the double-excitation input end is connected with the double-excitation output end, the switching control end is connected with the display control unit, and the emission excitation output end is respectively connected with the multiple groups of electrodes.
According to some embodiments of the present invention, the sending unit further includes an overvoltage detection unit electrically connected to the display control unit, and the overvoltage detection unit is configured to collect the output voltage of the voltage boost circuit and transmit the output voltage to the display control unit.
According to some embodiments of the present invention, the sending unit further includes a current detection unit electrically connected to the display control unit, and the current detection unit is configured to collect the dual excitation signal output by the inverter circuit and transmit the dual excitation signal to the display control unit.
According to some embodiments of the present invention, the sending unit further includes a dual over-current and over-voltage protection circuit, connected between the inverter circuit and the boost circuit, for directly adjusting the operating state of the boost circuit according to the output state of the inverter circuit.
According to some embodiments of the utility model, the output electrode switching circuit comprises:
the electrode connecting end row is provided with a first connecting end, a second connecting end, a third connecting end and a fourth connecting end which are used for connecting a plurality of groups of electrodes together;
the anode of the input end of the first optical coupling unit is used for connecting working voltage, the cathode of the input end of the first optical coupling unit is connected with the display control unit, the cathode of the output end of the first optical coupling unit is connected with the first connecting end of the electrode connecting end row, and the anode of the output end and the fourth connecting end of the electrode connecting end row are respectively connected with the double-excitation output end of the inverter circuit;
the anode of the input end of the second optical coupling unit is connected with the anode of the input end of the first optical coupling unit, the cathode of the input end of the second optical coupling unit is connected with the display control unit, the cathode of the output end of the second optical coupling unit is connected with the second connecting end of the electrode connecting end row, and the anode of the output end of the second optical coupling unit is connected with the anode of the output end of the first optical coupling unit;
and the anode of the input end of the third optical coupling unit is connected with the anode of the input end of the first optical coupling unit, the cathode of the input end of the third optical coupling unit is connected with the display control unit, the cathode of the output end of the third optical coupling unit is connected with the third connecting end of the electrode connecting end row, and the anode of the output end of the third optical coupling unit is connected with the anode of the output end of the first optical coupling unit.
According to some embodiments of the utility model, the receiving unit comprises:
the receiving circuits of the two paths are respectively provided with a detection signal input end, a calibration signal input end and a preprocessing signal output end, the detection signal input end is used for receiving the detection signal, the calibration signal input end is used for receiving the calibration signal sent by the sending unit, and each receiving circuit is used for preprocessing the detection signal;
and the input end of the receiving control circuit is connected with the preprocessing signal output end, and the output end of the receiving control circuit is connected with the display control unit and used for outputting the digital detection signal.
According to some embodiments of the utility model, each of the receive circuits comprises:
a primary amplification circuit having two inputs for receiving the probe signal and the calibration signal, respectively, and an output;
the input end of the two-stage band-pass filter circuit is connected with the output end of the primary amplifying circuit;
the input end of the program-controlled amplifying circuit is connected with the output end of the two-stage band-pass filter circuit;
and the input end of the analog-to-digital conversion circuit is connected with the output end of the program-controlled amplifying circuit, and the output end of the analog-to-digital conversion circuit is connected with the input end of the receiving control circuit.
According to some embodiments of the utility model, the mining dual-frequency induced polarization detection system further comprises an isolation circuit connected between the receiving control circuit and the display control unit.
According to some embodiments of the utility model, the display control unit comprises:
a display unit;
an input unit;
and the main control unit is respectively connected with the display unit, the input unit, the sending unit and the receiving unit.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a system block diagram of a mining dual-frequency induced polarization detection system according to an embodiment of the utility model;
FIG. 2 is a system connection block diagram of a display and control unit according to an embodiment of the present invention;
FIG. 3 is a system block diagram of a transmitting unit of an embodiment of the present invention;
FIG. 4 is a system block diagram of a receiving unit of an embodiment of the present invention;
FIG. 5 is a circuit schematic of an inverter circuit of an embodiment of the present invention;
FIG. 6 is a circuit schematic of an output electrode switching circuit of an embodiment of the present invention;
FIG. 7 is a circuit schematic of a dual overcurrent and overvoltage protection circuit according to an embodiment of the utility model;
FIG. 8 is a circuit schematic of a two-stage bandpass filter circuit of an embodiment of the utility model;
fig. 9 is a circuit schematic of an isolation cell of an embodiment of the present invention.
Reference numerals:
a power supply unit 100,
A sending unit 200, a booster circuit 210, an inverter circuit 220, an output electrode switching circuit 230, an overvoltage detection unit 240, a current detection unit 250, a double overcurrent and overvoltage protection circuit 260,
A receiving unit 300, a two-way receiving circuit 310, a primary amplifying circuit 311, a two-stage band-pass filtering circuit 312, a program-controlled amplifying circuit 313, an analog-to-digital conversion circuit 314, a receiving control circuit 320,
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the directional descriptions, such as the directions of upper, lower, front, rear, left, right, etc., are referred to only for convenience of describing the present invention and for simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
A mining dual-frequency induced polarization detection system according to an embodiment of the present invention is described below with reference to fig. 1 to 9.
The mining dual-frequency induced polarization detection system comprises a power supply unit 100, a sending unit 200, a prefabricating device, a receiving unit 300, a display and control unit 400 and a plurality of groups of electrodes.
A power supply unit 100 for supplying a direct current voltage;
a transmitting unit 200, configured to boost the dc voltage and convert the dc voltage into a detection excitation signal, and boost the dc voltage and convert the dc voltage into a calibration accuracy signal;
a plurality of sets of electrodes connected to the transmitting unit 200, all for transmitting the detection excitation signal;
a receiving unit 300, configured to receive the calibration precision signal, perform synchronous calibration, and receive the detection signal and convert the detection signal into a digital detection signal;
the display control unit 400 is connected to the power supply unit 100, the transmission unit 200, and the reception unit 300, respectively.
Referring to fig. 1 to 9, the power supply unit 100 may generate a dc voltage, and the transmitting unit 200 may boost the dc voltage, further invert the boosted voltage, and convert the voltage into a dual excitation signal. After the corresponding output electrode is selected, the double excitation signals are converted into corresponding detection excitation signals and are output by the selected electrode. For the switching of the electrodes, the sending unit 200 completes the switching, and the sending unit 200 can switch to the corresponding electrodes to output the detection excitation signal by receiving the selection signal sent by the display and control unit 400.
The receiving unit 300 may receive the feedback detection signal and perform digital processing on the detection signal to ensure that the display control unit 400 can complete receiving. The digital preprocessing process is completed in the receiving unit 300, so that the operation amount of the display control unit 400 can be reduced to a certain extent, and the effective processing capacity of the display control unit 400 is improved.
Meanwhile, when the transmitting unit 200 converts the dual excitation signal, a calibration precision signal is converted, the calibration precision signal is directly transmitted to the receiving unit 300, and the receiving unit 300 can perform synchronous calibration by using the calibration precision signal, thereby ensuring the accuracy of subsequent calculation and analysis. It should be noted here that the calibration signal may be a standard dual-frequency signal with an amplitude of 16.7mV ± 0.1 mV.
According to the mining dual-frequency induced polarization detection system provided by the embodiment of the utility model, a working power supply can be provided for the whole mining dual-frequency induced polarization detection system through the power supply unit 100; the sending unit 200 may directly generate a detection excitation signal and a calibration precision signal by using the dc voltage output by the power supply unit 100, the detection excitation signal may be used for detection, and the calibration precision signal may be received by the receiving unit 300 to achieve accurate synchronization; due to the arrangement of the multiple groups of electrodes, the sending unit 200 can realize different working modes, so that the method is suitable for construction of more scenes. Compared with the traditional double-frequency excitation detection instrument, the mining double-frequency excitation detection system provided by the embodiment of the utility model has a better synchronization effect, can realize more working modes, and is suitable for industrial popularization.
In some embodiments of the present invention, referring to fig. 3, 5 to 7, the transmitting unit 200 includes: a booster circuit 210, an inverter circuit 220, and an output electrode switching circuit 230.
A booster circuit 210, an input end of which is connected to the power supply unit 100, for boosting a dc voltage;
the inverter circuit 220 is provided with an inverter input end, a dual excitation output end and a calibration signal output end, the inverter input end is connected with the output end of the booster circuit 210, the calibration signal output end is connected with the receiving unit 300, and the inverter circuit 220 is used for inverting the boosted direct-current voltage to obtain a dual excitation signal and a calibration signal;
the output electrode switching circuit 230 has a switching control terminal, a dual excitation input terminal, and a transmission excitation output terminal, the dual excitation input terminal is connected to the dual excitation output terminal, the switching control terminal is connected to the display control unit 400, and the transmission excitation output terminal is connected to the plurality of groups of electrodes.
The power supply unit 100 outputs a dc voltage to the voltage boost circuit 210, the voltage boost circuit 210 boosts the dc voltage to obtain a dc voltage with a higher voltage meeting the use requirement, then the inverter circuit 220 further converts the dc voltage with the higher voltage to obtain a dual excitation signal with a specific frequency, and sends the dual excitation signal to the output electrode switching circuit 230, and meanwhile, the inverter circuit 220 converts a calibration signal to the receiving unit 300. After the dual excitation signal is input to the output electrode switching circuit 230, the output electrode switching circuit 230 selects the corresponding electrode as an output according to the control signal output by the display control unit 400, and meanwhile, the output electrode switching circuit 230 also converts the dual excitation signal into a detection excitation signal and outputs the detection excitation signal through the electrode. It should be noted that the conversion of the inverter circuit 220 to obtain the dual excitation signal with the specific frequency is completed under the control of the display control unit 400, and the display control unit 400 outputs the inverter driving signal with the same frequency as the dual excitation signal, so as to control the inverter circuit 220 to output the dual excitation signal with the corresponding frequency.
In some embodiments of the present invention, the DC-DC voltage transformation device adopted by the voltage boost circuit 210 can convert the 12V voltage output by the power supply unit 100 into a higher voltage of 85V at most, so as to satisfy the requirement of subsequent detection of the excitation signal.
In some embodiments of the present invention, referring to fig. 5, the inverter circuit 220 mainly includes three triodes Q3, Q4, Q5, two optocouplers U15, U16, a relay U14, and a peripheral circuit. Wherein, U1 and V1 are inversion driving signals (which can be understood as oscillation signals with specific frequency) and are output by the display control unit 400; JZ3 is a calibration output control signal, which is also output by the display control unit 400; + Vin is the inverting input terminal of the inverting circuit 220, connected to the output port of the boost circuit 210; A. b is a dual-excitation output terminal of the inverter circuit 220 connected to a dual-excitation input terminal of the output electrode switching circuit 230; JZ1 and JZ2 are calibration signal output terminals for outputting calibration signals, and are connected to the receiving unit 300. Io1 is a port for outputting current, and is connected with the current detection unit 250 and the dual overcurrent and overvoltage protection circuit 260; when the dual-frequency excitation circuit works normally, the optocouplers U15 and U16 are driven by signals U1 and V1, and output dual-frequency excitation signals to the dual-excitation output end A, B; during instrument calibration, the display and control unit 400 controls the relay U14 to operate through JZ3, and calibration signals are output to the receiving unit 300 at two ends of JZ1 and JZ 2.
In some embodiments of the present invention, referring to fig. 3, the sending unit 200 further includes an overvoltage detection unit 240 electrically connected to the display control unit 400, and the overvoltage detection unit 240 is used for collecting the output voltage of the voltage boost circuit 210 and transmitting the output voltage to the display control unit 400. The overvoltage detection unit 240 can collect the output voltage value of the booster circuit 210 and transmit the output voltage value to the display control unit 400, the display control unit 400 can further judge whether the output voltage value exceeds a safety range, if the output voltage value exceeds the safety range, overvoltage protection can be triggered, and the display control unit 400 can output a signal to the booster circuit 210 to enable the booster circuit 210 to stop outputting. The overvoltage detection unit 240 may directly employ a voltage sensor, or may employ a voltage detection circuit.
In some embodiments of the present invention, referring to fig. 3, the sending unit 200 further includes a current detecting unit 250 electrically connected to the display and control unit 400, and the current detecting unit 250 is used for collecting the dual excitation signals output by the inverter circuit 220 and transmitting the dual excitation signals to the display and control unit 400. The current detection unit 250 can collect the output current value of the inverter circuit 220 and transmit the output current value to the display control unit 400, and the output current and the output voltage can be displayed through the display control unit 400, so that the explorationist can visually know the output state of the transmission unit 200. Meanwhile, the output current is detected, which can be used as a basis for judging whether the current is over-current or not, so that the display control unit 400 can control the boost circuit 210 to stop outputting in time. The current detection unit 250 may directly employ a current sensor.
In some embodiments of the present invention, referring to fig. 3, the transmitting unit 200 further includes a dual overcurrent and overvoltage protection circuit 260, and the dual overcurrent and overvoltage protection circuit 260 is connected between the inverter circuit 220 and the voltage boosting circuit 210, and is configured to directly adjust the operating state of the voltage boosting circuit 210 according to the output state of the inverter circuit 220. The dual over-current and over-voltage protection circuit 260 performs over-current and over-current protection without passing through the display control unit 400, and can directly control whether the boost circuit 210 stops outputting according to the output result of the inverter circuit 220. Compared with the protection performed by the display control unit 400, the method has higher real-time performance and safety.
In some embodiments of the present invention, referring to fig. 7, the dual overcurrent and overvoltage protection circuit 260 uses a plurality of operational amplification circuits and comparison circuits, and directly performs comparison operation to complete the overcurrent judgment of the output current outputted by the inverter circuit 220. In fig. 7, the Io1 port is connected to the inverter circuit 220; U20A, U22A and U22B are operational amplifiers for amplifying and filtering current signals input from an Io1 port; U21A and U21B are comparators for comparing the amplified and filtered current signal with a set safe current value and outputting a high level once the output is exceeded. Cur _ Over1 and Cur _ Over2 are overcurrent alarm output ends, the signals are output to the booster circuit 210 after passing through the signal self-locking circuit, and once overcurrent occurs, the booster circuit 210 is directly controlled to directly stop working. Here, the preset safe current value is obtained by directly dividing the voltage by the resistor. It should be noted that both the operational amplifier and the comparator can be implemented as a multi-channel conventional product.
In some embodiments of the present invention, referring to fig. 6, the output electrode switching circuit 230 includes: electrode connection end row P2, first opto-coupler unit, second opto-coupler unit, third opto-coupler unit.
The electrode connecting end row is provided with a first connecting end, a second connecting end, a third connecting end and a fourth connecting end which are used for connecting a plurality of groups of electrodes together;
the anode of the input end of the first optical coupling unit is used for connecting working voltage, the cathode of the input end is connected with the display control unit 400, the cathode of the output end is connected with the first connecting end of the electrode connecting end row, and the anode of the output end and the fourth connecting end of the electrode connecting end row are respectively connected with the double excitation output ends of the inverter circuit 220;
the anode of the input end of the second optical coupling unit is connected with the anode of the input end of the first optical coupling unit, the cathode of the input end is connected with the display and control unit 400, the cathode of the output end is connected with the second connecting end of the electrode connecting end row, and the anode of the output end is connected with the anode of the output end of the first optical coupling unit;
and an input end anode of the third optical coupling unit is connected with an input end anode of the first optical coupling unit, an input end cathode is connected with the display control unit 400, an output end cathode is connected with a third connecting end of the electrode connecting end row, and an output end anode is connected with an output end anode of the first optical coupling unit.
Referring to fig. 6, S _ a0, S _ a1, and S _ a2 are input end cathodes of three optocouplers, connected to the display control unit 400, and configured to receive a control signal sent by the display control unit 400, so that the three optocouplers can be respectively turned on and off; A. the terminal B is connected to an A, B port (shown in fig. 5) in the inverter circuit 220, so as to receive the dual excitation signals output by the inverter circuit 220; the electrode connecting terminal row P2 is a detection excitation signal output port and is directly connected with the output electrode. When the system works, a user selects a required working mode through the display control unit 400, the display control unit 400 can select three working states, namely A0, B, A1, B, A2 and B, by controlling the conduction states of the optical couplers in U17 and U18, and A0, A1 and A2 are respectively connected with different electrodes. It should be noted here that the U17 and the U18 are AQW210, and two optical couplers are provided inside the U17 and the U18, so that the first optical coupler unit and the second optical coupler unit may be provided by being integrated in the U17, and the third optical coupler unit may be provided by using the U18.
Specifically, as shown in fig. 6 for example, when a low level signal is input to the S _ a1 and a high level signal is input to the S _ a0 and the S _ a2, the second optocoupler unit is turned on, so that the a1 terminal and the B terminal receive the dual excitation signals input by the inverter circuit 220, the selection of the output electrode is completed, and the change from the dual excitation signals to the detection excitation signals is also completed.
In some embodiments of the present invention, referring to fig. 4, the receiving unit 300 includes: two-way receiving circuit 310, receiving control circuit 320. Two receiving circuits 310, each receiving circuit 310 having a detection signal input end, a calibration signal input end and a preprocessing signal output end, the detection signal input end being configured to receive a detection signal, the calibration signal input end being configured to receive a calibration signal sent by the sending unit 200, and each receiving circuit 310 being configured to preprocess the detection signal; and the input end of the receiving control circuit 320 is connected with the preprocessing signal output end, and the output end of the receiving control circuit is connected with the display control unit 400, so as to output a digital detection signal.
The receiving circuit 310 mainly amplifies, filters and converts the received detection signal to an analog signal, so that the received analog signal can be converted into a stable digital signal which can be received and identified by the receiving control circuit 320, and the digital signal is converted into a required digital detection signal through the receiving control circuit 320, wherein the digital detection signal mainly includes amplitudes and phases of high and low frequencies. The receiving control circuit 320 further outputs the digital detection signal to the display control unit 400, and the display control unit 400 performs subsequent data forwarding or data analysis.
In some embodiments of the present invention, the core processor of the receiving control circuit 320 may be a single chip, a DSP or an ARM. Specifically, an STM32 series processor may be used.
In some embodiments of the present invention, referring to fig. 4, each receiving circuit 310 includes: a primary amplifying circuit 311, a two-stage band-pass filter circuit 312, a program-controlled amplifying circuit 313 and an analog-to-digital conversion circuit 314. A primary amplification circuit 311 having two inputs for receiving the detection signal and the calibration signal, respectively, and one output; a two-stage band-pass filter circuit 312, an input end of which is connected to an output end of the primary amplification circuit 311; a programmable amplifying circuit 313, the input end of which is connected with the output end of the two-stage band-pass filter circuit 312; the input end of the analog-to-digital conversion circuit 314 is connected with the output end of the program control amplifying circuit 313, and the output end is connected with the input end of the receiving control circuit 320.
The primary amplifying circuit 311 performs a primary amplification on the detection signal, and then filters interference noise through the two-stage band-pass filter circuit 312, and converts the interference noise into a digital signal that can be received and identified by the receiving control circuit 320 through the analog-to-digital conversion unit. Meanwhile, the programmable amplifying circuit 313 is added to adjust the gain according to the magnitude of the detection signal, so as to ensure that the signal input into the analog-to-digital conversion circuit 314 is proper in magnitude. In addition, the primary amplifying circuit 311 receives the calibration signal transmitted from the transmitting unit 200 to improve the accuracy of the output signal of the entire conversion process.
In some embodiments of the present invention, referring to fig. 8, the two-stage band-pass filter circuit 312 includes four operational amplifiers U14A, U14B, U15A and U15B, the four operational amplifiers U14A and U14B are two-channel operational amplification modules, the two-channel operational amplification modules U15A and U15B are another two-channel operational amplification module, and the T6 port is connected to the output end of the primary amplification circuit 311; the T10 port is connected to the input of the programmable amplifying circuit 313. The whole two-stage band-pass filter circuit 312 is composed of a two-stage Sallen-Key high-pass filter and a two-stage multiple negative feedback low-pass filter, and the pass band can be set to be 0.05 Hz-600 Hz, so that a good band-pass filtering effect can be realized.
In some embodiments of the present invention, the mining dual-frequency induced polarization detection system further includes an isolation circuit connected between the receiving control circuit 320 and the display control unit 400. Signal interference can be reduced by signal transmission through the isolation circuit. Meanwhile, in order to further avoid the influence of battery interference on the receiving unit 300, the power input of the receiving unit 300 may be added with an isolated DC-DC power. In addition, electromagnetic shielding is added to the two receiving circuits 310 of the receiving unit 300.
In some embodiments of the present invention, referring to fig. 9, a schematic circuit diagram of an isolation unit disposed between the receiving unit 300 and the display control unit 400 is shown in fig. 9, wherein TB and J _ TB are synchronous line connection ports, TX1, RX1, J _ TX1, and J _ RX1 are serial communication line connection ports, NRST and J _ NRST are reset line connection ports, TB, TX1, RX1, and NRST are connected to the display control unit 400, and J _ TB, J _ TX1, J _ RX1, and J _ NRST are connected to the receiving unit 300. The receiving unit 300 starts AD conversion by detecting a rising edge of the J _ TB transmission signal. The model of the high-speed optical coupler is HCPL-2630.
In some embodiments of the present invention, referring to fig. 2, the display control unit 400 includes: a display unit 410, an input unit 420, and a main control unit 430. And a main control unit 430 connected to the display unit 410, the input unit 420, the transmission unit 200, and the reception unit 300, respectively. The display unit 410 may directly employ an LCD display screen or an LED display screen, the input unit 420 may employ a keyboard, or the display unit 410 and the input unit 420 may commonly use a liquid crystal touch screen. The main control unit 430 may be a single chip, a DSP or an ARM, and specifically may be an STM32 series processor. The main control unit 430 performs preprocessing on the collected information in a main view, and the display unit 410 and the input unit 420 are mainly adapted to modify some operation parameters.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A mining dual-frequency induced polarization detection system is characterized by comprising:
a power supply unit (100) for supplying a direct voltage;
the sending unit (200) is used for boosting the direct-current voltage and converting the direct-current voltage into a detection excitation signal, and boosting the direct-current voltage and converting the direct-current voltage into a calibration precision signal;
the multiple groups of electrodes are connected with the sending unit (200) and are all used for sending the detection excitation signals;
a receiving unit (300) for receiving the calibration precision signal, performing synchronous calibration, and receiving a detection signal and converting the detection signal into a digital detection signal;
and the display control unit (400) is respectively connected with the power supply unit (100), the sending unit (200) and the receiving unit (300).
2. The mining dual-frequency induced polarization detection system according to claim 1, wherein the transmitting unit (200) comprises:
a boost circuit (210) having an input connected to the power supply unit (100) and configured to boost the DC voltage;
the inverter circuit (220) is provided with an inverter input end, a double excitation output end and a calibration signal output end, the inverter input end is connected with the output end of the booster circuit (210), the calibration signal output end is connected with the receiving unit (300), and the inverter circuit (220) is used for inverting the boosted direct-current voltage to obtain a double excitation signal and the calibration signal;
the output electrode switching circuit (230) is provided with a switching control end, a double-excitation input end and an emission excitation output end, the double-excitation input end is connected with the double-excitation output end, the switching control end is connected with the display control unit (400), and the emission excitation output end is respectively connected with the plurality of groups of electrodes.
3. The mining dual-frequency induced polarization detection system according to claim 2, wherein the sending unit (200) further comprises an overvoltage detection unit (240) electrically connected to the display and control unit (400), and the overvoltage detection unit (240) is configured to collect the output voltage of the voltage boost circuit (210) and transmit the output voltage to the display and control unit (400).
4. The mining dual-frequency induced polarization detection system according to claim 2, wherein the sending unit (200) further comprises a current detection unit (250) electrically connected to the display and control unit (400), and the current detection unit (250) is configured to collect the dual excitation signals output by the inverter circuit (220) and transmit the dual excitation signals to the display and control unit (400).
5. The mining dual-frequency induced polarization detection system according to claim 2, wherein the sending unit (200) further comprises a dual over-current over-voltage protection circuit (260), and the dual over-current over-voltage protection circuit (260) is connected between the inverter circuit (220) and the boosting circuit (210) and is used for directly adjusting the working state of the boosting circuit (210) according to the output state of the inverter circuit (220).
6. The mining dual-frequency induced polarization detection system of claim 2, wherein the output electrode switching circuit (230) comprises:
the electrode connecting end row is provided with a first connecting end, a second connecting end, a third connecting end and a fourth connecting end which are used for connecting a plurality of groups of electrodes together;
the anode of the input end of the first optical coupling unit is used for being connected with working voltage, the cathode of the input end of the first optical coupling unit is connected with the display control unit (400), the cathode of the output end of the first optical coupling unit is connected with the first connecting end of the electrode connecting end row, and the anode of the output end of the first optical coupling unit and the fourth connecting end of the electrode connecting end row are respectively connected with the double-excitation output end of the inverter circuit (220);
the anode of the input end of the second optical coupling unit is connected with the anode of the input end of the first optical coupling unit, the cathode of the input end of the second optical coupling unit is connected with the display control unit (400), the cathode of the output end of the second optical coupling unit is connected with the second connecting end of the electrode connecting end row, and the anode of the output end of the second optical coupling unit is connected with the anode of the output end of the first optical coupling unit;
and the anode of the input end of the third optical coupling unit is connected with the anode of the input end of the first optical coupling unit, the cathode of the input end is connected with the display control unit (400), the cathode of the output end is connected with the third connecting end of the electrode connecting end row, and the anode of the output end is connected with the anode of the output end of the first optical coupling unit.
7. The mining dual-frequency induced polarization detection system according to claim 1, wherein the receiving unit (300) comprises:
two receiving circuits (310), each receiving circuit (310) having a detection signal input end, a calibration signal input end and a preprocessing signal output end, the detection signal input end being configured to receive the detection signal, the calibration signal input end being configured to receive the calibration signal sent by the sending unit (200), and each receiving circuit (310) being configured to preprocess the detection signal;
and the input end of the receiving control circuit (320) is connected with the preprocessing signal output end, and the output end of the receiving control circuit is connected with the display control unit (400) and used for outputting the digital detection signal.
8. The mining dual-frequency induced polarization detection system of claim 7, wherein each of the receiving circuits (310) comprises:
a primary amplification circuit (311) having two inputs for receiving the probe signal and the calibration signal, respectively, and an output;
a two-stage band-pass filter circuit (312) having an input connected to an output of the primary amplification circuit (311);
the input end of the program-controlled amplifying circuit (313) is connected with the output end of the two-stage band-pass filtering circuit (312);
and the input end of the analog-to-digital conversion circuit (314) is connected with the output end of the program-controlled amplification circuit (313), and the output end of the analog-to-digital conversion circuit is connected with the input end of the receiving control circuit (320).
9. The mining dual-frequency induced polarization detection system according to claim 7, further comprising an isolation circuit connected between the receiving control circuit (320) and the display control unit (400).
10. The mining dual-frequency induced polarization detection system according to claim 1, wherein the display and control unit (400) comprises:
a display unit (410);
an input unit (420);
and the main control unit (430) is respectively connected with the display unit (410), the input unit (420), the sending unit (200) and the receiving unit (300).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122234199.2U CN216083136U (en) | 2021-09-15 | 2021-09-15 | Mining dual-frequency induced polarization detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122234199.2U CN216083136U (en) | 2021-09-15 | 2021-09-15 | Mining dual-frequency induced polarization detection system |
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| CN216083136U true CN216083136U (en) | 2022-03-18 |
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| CN202122234199.2U Active CN216083136U (en) | 2021-09-15 | 2021-09-15 | Mining dual-frequency induced polarization detection system |
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| CN (1) | CN216083136U (en) |
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