CN211402772U - Double-frequency induced polarization signal sending device - Google Patents
Double-frequency induced polarization signal sending device Download PDFInfo
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- CN211402772U CN211402772U CN202020443650.4U CN202020443650U CN211402772U CN 211402772 U CN211402772 U CN 211402772U CN 202020443650 U CN202020443650 U CN 202020443650U CN 211402772 U CN211402772 U CN 211402772U
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Abstract
The utility model discloses a double-frequency induced polarization signal sending device, which comprises a double-frequency signal source, an output loop and a plurality of sending channels, wherein each sending channel comprises a high-frequency isolation amplifying circuit, a low-frequency isolation amplifying circuit, an adder, a low-pass filter circuit and a power amplifying circuit; the input end of the high-frequency isolation amplifying circuit and the input end of the low-frequency isolation amplifying circuit are connected with a dual-frequency signal source, the output end of the high-frequency isolation amplifying circuit and the output end of the low-frequency isolation amplifying circuit are connected with the input end of an adder, and the adder, the low-pass filter circuit and the power amplifying circuit are sequentially connected in series; and the output ends of the power amplifying circuits of all the transmitting channels are connected with an output loop to supply power to the ground. The utility model discloses a RC low pass filter circuit directly reduces high fidelity power amplification behind the border rate of change of compound dual-frenquency signal, supplies power to the earth again to showing the electromagnetic coupling interference that reduces electrical prospecting signalling and return circuit and arouse, suppressing electromagnetic coupling interference to swashing electric signal measuring influence.
Description
Technical Field
The utility model relates to an electrical prospecting technical field, in particular to dual-frenquency swashs electric signal transmission device.
Background
The invention relates to a double-channel multi-parameter frequency spectrum induced polarization observation system (ZL 88105655.3, good, Bao Guangshi and Renbalin), the observation method of the invention is called as a double-frequency induced polarization method for short, the observation device is called as a double-frequency induced polarization instrument for short, the invention is one of common methods and devices for mineral resource general investigation and exploration in China, and the invention has the advantages of strong anti-interference capability, simple and convenient operation, no need of terrain correction, portable devices and the like, the common frequency groups of the current double-frequency induced polarization instrument comprise 4 frequency groups of 8Hz, 8/13Hz, 4Hz4/13Hz, 2Hz2/13Hz and 1Hz1/13Hz, and any one of the frequency groups can be selected for working. However, the common problem in the application of the frequency domain induced polarization method such as electromagnetic coupling interference inevitably exists in the application of the double-frequency induced polarization method, the common problem is caused by two factors of inductive coupling and capacitive coupling between an output loop of a transmitter and an input loop of a receiver, the strength of the common problem is mainly determined by the inductive coupling, the interfered degree is enhanced along with the reduction of underground resistivity, the increase of frequency and the increase of polar distance, the measured value of the induced polarization amplitude frequency is directly influenced, the common problem is a very strong interference factor objectively existing in the application of the frequency domain induced polarization method, particularly, the quality of the amplitude frequency measurement data is seriously influenced when a low-resistivity coverage area or a large polar distance is measured, and the geological evaluation accuracy is influenced.
In order to correct the adverse effect of electromagnetic coupling interference, domestic and foreign scholars mainly adopt a data processing method to correct the influence of the electromagnetic coupling interference, which has a better correction effect when the electromagnetic coupling interference is weaker, and when the electromagnetic coupling interference is enhanced, the correction effect is generally poorer, so that the exploration requirement under the field complex geological condition is difficult to meet. In the aspect of direct decoupling of hardware, the patent "a frequency domain electrical method instrument GPS precision synchronous chopping decoupler", ZL200710035797.9, invented a method for synchronously chopping a received signal to eliminate electromagnetic coupling interference in the received signal, the decoupling effect was good, but the method had the problem of measurement error introduced by chopping and the use condition required for strict synchronization of the transmitter and the receiver.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a simple structure, stable double-frenquency of output waveform excite electric signal transmission device.
The utility model provides a technical scheme of above-mentioned problem is: a double-frequency induced polarization signal sending device comprises a double-frequency signal source, an output loop for supplying power to the ground and a plurality of sending channels, wherein each sending channel comprises a high-frequency isolation amplifying circuit, a low-frequency isolation amplifying circuit, an adder, a low-pass filter circuit and a power amplifying circuit; in each transmitting channel, the input end of a high-frequency isolation amplifying circuit is connected with a dual-frequency signal source to receive a high-frequency square wave, the input end of a low-frequency isolation amplifying circuit is connected with the dual-frequency signal source to receive a low-frequency square wave, the output end of the high-frequency isolation amplifying circuit and the output end of the low-frequency isolation amplifying circuit are connected with the input end of an adder, and the output end of the adder, a low-pass filter circuit and a power amplifying circuit are sequentially connected in series; and the output ends of the power amplifying circuits of all the transmitting channels are connected with an output loop to supply power to the ground.
The double-frequency induced signal transmitting device has the same structure of the high-frequency isolation amplifying circuit and the low-frequency isolation amplifying circuit, the high-frequency isolation amplifying circuit comprises a first resistor, a second resistor, an optical coupler, a first field effect tube and a second field effect tube, one end of the first resistor is used as an input end of the high-frequency isolation amplifying circuit and connected with an output end of the double-frequency signal source, the other end of the first resistor is connected with a 1 st pin of the optical coupler, a 2 nd pin of the optical coupler is grounded, a 4 th pin of the optical coupler is respectively connected with one end of the second resistor, a grid electrode of the first field effect tube and a grid electrode of the second field effect tube, the other end of the second resistor and a source electrode of the first field effect tube are connected with a positive power supply, a 3 rd pin of the optical coupler and a source electrode of the second field effect tube are connected with a negative power supply of the channel, and a drain electrode of the first field effect tube is connected with a drain electrode of the second field effect tube.
In the above dual-frequency induced signal transmitting device, the first field effect transistor is a P-channel enhanced field effect transistor, and the second field effect transistor is an N-channel enhanced field effect transistor.
The adder comprises a third resistor, a fourth resistor, a fifth resistor and an operational amplifier, one end of the third resistor is grounded, the other end of the third resistor is connected with the output end and the inverting input end of the operational amplifier, one end of the fourth resistor is connected with the output end of the high-frequency isolation amplifying circuit, one end of the fifth resistor is connected with the output end of the low-frequency isolation amplifying circuit, the other end of the fourth resistor is connected with the other end of the fifth resistor and connected to the non-inverting input end of the operational amplifier, and the output end of the operational amplifier serves as the output end of the adder.
The double-frequency induced signal sending device comprises a low-pass filter circuit, a low-pass filter circuit and a capacitor, wherein the low-pass filter circuit comprises a capacitor and a first switch, one end of the first switch is used as the input end of the low-pass filter circuit and is connected with the output end of the adder, the other end of the first switch is connected with one end of the capacitor and is used as the output end of the low-pass filter circuit, the other end of the capacitor is grounded, two ends of the first switch are connected with a plurality of branch circuits in parallel, and each branch circuit comprises a.
In the above dual-frequency induced polarization signal transmitting device, the high-frequency square wave and low-frequency square wave dual-frequency signals synchronously generated by the dual-frequency signal source are any one of 8Hz and 8/13Hz frequency groups, 4Hz4/13Hz frequency groups, 2Hz2/13Hz or 1Hz1/13Hz frequency groups, and the frequency ratio S =13 of the high-frequency signals to the low-frequency signals in each frequency group; or any dual-frequency combined rectangular wave signal with a frequency in the range of 0.01Hz-100Hz and a frequency ratio of S =7 or S =9, 11, 13, 15, 17, 19.
In the dual-frequency induced polarization signal transmitting device, the dual-frequency signal source adopts one of a single chip microcomputer, a programmable logic device CPLD, a field programmable gate array device FPGA, a digital signal processor DSP, a direct digital frequency synthesizer DDS and a sequential logic circuit.
According to the double-frequency induced signal transmitting device, the output ends of the power amplifying circuits of all the transmitting channels are independent, or a plurality of power amplifying circuits are connected in series to form an output loop to supply power to the ground.
The beneficial effects of the utility model reside in that:
1. the utility model discloses an including low pass filter circuit among the transmitting device, the branch road quantity of access can be changed through the break-make that changes branch road switch among the low pass filter circuit to change low pass filter circuit's time constant, and then adjust the border rate of change of output waveform, the suppression is sent the high order component in the return circuit output waveform, is showing to reduce and sends the inductive coupling interference of return circuit current to receiver input circuit, suppresses the influence of electromagnetic coupling interference to receiver measured data.
2. The utility model discloses the border rate of change of transmitter output waveform can be according to field work needs, sets for through switching low pass filter circuit's time constant, and transmitter output waveform receives ground connection condition to influence for a short time, and is easy and simple to handle.
3. The utility model discloses a when sending device needed higher output voltage, the output of arbitrary a plurality of delivery channel can cascade (establish ties) the output, provides higher output voltage.
4. The utility model discloses a RC low pass filter circuit directly reduces high fidelity power amplification behind the border rate of change of combination dual-frenquency signal, supplies power to the earth again to showing the electromagnetic coupling interference that reduces the electric exploration signalling return circuit and produce, suppressing electromagnetic coupling interference to swaying electric signal measuring influence, improving received signal's SNR and received data quality.
Drawings
Fig. 1 is a block diagram of the dual-frequency induced polarization signal transmitting device of the present invention.
Fig. 2 is a schematic circuit diagram of the high frequency isolation amplifier circuit of fig. 1.
Fig. 3 is a schematic circuit diagram of the adder of fig. 1.
Fig. 4 is a schematic circuit diagram of the low-pass filter circuit of fig. 1.
Fig. 5 is a simulation diagram of the waveform of the rising edge of the rectangular wave according to the present invention.
Fig. 6 is a waveform simulation diagram of a falling edge of a rectangular wave according to the present invention.
Fig. 7 is a schematic diagram of a waveform of a part of a test point of a transmitting apparatus when a frequency ratio of a high frequency to a low frequency in a dual-frequency signal is 13 according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, a double-frequency induced signal transmitting device comprises a double-frequency signal source, an output loop for supplying power to the ground and a plurality of transmitting channels, wherein each transmitting channel comprises a high-frequency isolation amplifying circuit, a low-frequency isolation amplifying circuit, an adder, a low-pass filter circuit and a power amplifying circuit, the first transmitting channel comprises a high-frequency isolation amplifying circuit 1, a low-frequency isolation amplifying circuit 1, an adder 1, a low-pass filter circuit 1 and a power amplifying circuit 1, the second transmitting channel comprises a high-frequency isolation amplifying circuit 2, a low-frequency isolation amplifying circuit 2, an adder 2, a low-pass filter circuit 2 and a power amplifying circuit 2, the third transmitting channel comprises a high-frequency isolation amplifying circuit 3, a low-frequency isolation amplifying circuit 3, an adder 3, a low-pass filter circuit 3 and a power amplifying circuit 3, and the nth transmitting channel comprises a high-frequency isolation amplifying circuit n, The low-frequency isolation amplifying circuit comprises a low-frequency isolation amplifying circuit n, an adder n, a low-pass filter circuit n and a power amplifying circuit n; a dual-frequency signal source synchronously generates a high-frequency square wave and a low-frequency square wave; in each transmitting channel, the input end of a high-frequency isolation amplifying circuit is connected with a dual-frequency signal source to receive a high-frequency square wave, the input end of a low-frequency isolation amplifying circuit is connected with the dual-frequency signal source to receive a low-frequency square wave, the output end of the high-frequency isolation amplifying circuit and the output end of the low-frequency isolation amplifying circuit are connected with the input end of an adder, and the output end of the adder, a low-pass filter circuit and a power amplifying circuit are sequentially connected in series; the output ends of the power amplifying circuits of all the transmitting channels can be singly connected or connected in series to output a loop to supply power to the ground, and the edge change rate of the transmitting waveform can be adjusted by switching the time constant of the low-pass filter circuit of the transmitting channel according to the requirement.
The double-frequency signal source adopts a singlechip to generate high-frequency square wave and low-frequency square wave signals, and can also adopt a complex programmable logic device CPLD, a field programmable gate array device FPGA, a digital signal processor DSP, a direct digital frequency synthesizer DDS and a built time sequence logic circuit to generate.
The high-frequency isolation amplifying circuit and the low-frequency isolation amplifying circuit have the same structure, and can be one of optical coupling isolation, optical fiber isolation, an isolation driving chip and an isolation driving module to realize the isolation driving function. As shown in fig. 2, the high-frequency isolation amplifying circuit includes a first resistor R0, a second resistor R01, an optocoupler U1, a first field-effect transistor Q1, and a second field-effect transistor Q2, where the first field-effect transistor Q1 is a P-channel enhanced field-effect transistor, and the second field-effect transistor Q2 is an N-channel enhanced field-effect transistor; one end of the first resistor R0 is used as an input end IN of the high-frequency isolation amplifying circuit and is connected with an output end of a dual-frequency signal source, the other end of the first resistor R0 is connected with a 1 st pin of the optocoupler U1, a 2 nd pin of the optocoupler U1 is grounded, a 4 th pin of the optocoupler U1 is respectively connected with one end of the second resistor R01, a grid electrode of the first field-effect tube Q1 and a grid electrode of the second field-effect tube Q2, the other end of the second resistor R01 and a source electrode of the first field-effect tube Q1 are connected with a positive power supply +2.5V, a 3 rd pin of the optocoupler U1 and a source electrode of the second field-effect tube Q2 are both connected with a negative power supply-2.5V of the channel, and a drain electrode of the first field-effect tube Q1 is connected with a drain electrode of the second.
In fig. 2, a square wave signal generated by a dual-frequency signal source is input from a 1 st pin of an optocoupler U1, and is output from a 4 th pin, when the input square wave signal is at a high level, a light emitting diode in the optocoupler U1 emits light, a phototriode is in saturation conduction, the 4 th pin of the optocoupler outputs a low level, Q1 is in conduction, Q2 is off, and an OUT terminal outputs a high level; when the input square wave signal is at a low level, a light emitting diode in the optocoupler U1 is cut off, the phototriode is cut off, the 4 th pin of the optocoupler outputs a high level, the Q1 is cut off, the Q2 is conducted, and the OUT end outputs a low level. The high-frequency isolation amplifying circuit and the low-frequency isolation amplifying circuit finish the electrical isolation of the double-frequency signal source and the optocoupler post-stage circuit, and amplify and clamp the square wave signal at +2.5V (high level) and-2.5V (low level).
As shown in fig. 3, the adder includes a third resistor Rn, a fourth resistor RG, a fifth resistor RD, and an operational amplifier Un, where one end of the third resistor Rn is grounded, the other end of the third resistor Rn is connected to the inverting input terminal and the output terminal of the operational amplifier Un, one end of the fourth resistor RG is connected to the output terminal of the high frequency isolation amplifying circuit, one end of the fifth resistor RD is connected to the output terminal of the low frequency isolation amplifying circuit, the other end of the fourth resistor RG is connected to the other end of the fifth resistor RD and connected to the non-inverting input terminal of the operational amplifier Un, and the output terminal of the operational amplifier Un serves as the output terminal of the adder. The fourth resistor RG is equal to the fifth resistor RD in resistance, and the signal processed by the adder is connected with the output end of the adder, i.e., the LPin end. If the high-frequency square wave signal input by the adder is VG and the low-frequency square wave signal is VD, the signal output by the adder is (VG + VD)/2.
The low-pass filter circuit is an RC low-pass filter circuit with a fixed time constant or a plurality of selectable or adjustable gears; as shown in fig. 4, the low-pass filter circuit includes a capacitor C, and an arbitrarily switchable resistor connected in series with the capacitor, where the resistor and the capacitor form an RC low-pass filter circuit, and a low-pass filtered signal is output from an upper end of the capacitor C, i.e., the LPout end. The output end of the adder is connected with the LPin end of the low-pass filter circuit, the LPin end is connected with the left end of a switch S0, the left end of a resistor R1, the left end of a resistor R2, the left end of a resistor … and the left end of a resistor Rn, the right end of a resistor R1 is connected with the left end of a switch S1, the right end of a resistor R2 is connected with the left end of a switch S2, the right ends of … and the resistor Rn are connected with the left end of a switch Sn, the upper end of a capacitor C is respectively connected with the right end of a switch S0, the right end of the switch S1, the right end of a switch S2, the right end of the switch … and the right end of the switch Sn, the lower end of the capacitor C is connected with the power ground. When the switch S0 is closed, the low-pass filter time constant is zero, any one of the switches S1, S2, … and Sn, or any two or more of the switches, is closed to set the time constant of the RC low-pass filter circuit, wherein R is the equivalent resistance of the low-pass filter circuit (the resistance value connected in series with the switch when any one of the switches S1-Sn is closed, or the parallel value of the resistance connected into the low-pass filter circuit when any more of the switches are closed is the equivalent resistance), and the change rate of the dual-frequency combined rectangular wave edge can be changed by switching the RC time constant of the low-pass filter circuit.
The low-pass filtering time constants in the plurality of sending channels of the utility model are generally set to be the same numerical value, and each sending channel can also be set to be different low-pass filtering time constants according to the requirement; each transmitting channel can work independently, and can also output high-voltage signals in a cascading (series) mode, and in the application that the grounding resistance is very low and the required transmitting current is very large, a method that a plurality of transmitting channel output ends are connected in parallel can be adopted to increase the output current, and at the moment, the gains of all the signal transmitting channels are required to be the same, and the time constants of the low-pass filter circuits are required to be the same.
The high-frequency square wave and low-frequency square wave dual-frequency signals synchronously generated by the dual-frequency signal source are any one of 8Hz and 8/13Hz frequency groups, 4Hz4/13Hz frequency groups, 2Hz2/13Hz or 1Hz1/13Hz frequency groups, the frequency can be in the range of 0.01Hz-100Hz, the frequency ratio is S =7 or S =9, 11, 13, 15, 17 and 19, and the time constant of the low-pass filter circuit is correspondingly reduced when the high-frequency in the dual-frequency signals is above 10Hz so as to ensure the approximate form of the waveform in the transmitted combined rectangular wave signals.
The power amplifying circuit can adopt a high-fidelity analog power amplifying circuit or a digital power amplifying circuit, and when the digital power amplifying circuit is adopted, the power supply conversion efficiency is high, and the power supply is portable and reliable; the power amplifier gain is designed to be multi-gear selectable or designed to be fixed gain so as to ensure the gain precision and the stability of the output level. The output ends of the power amplifying circuits of all the transmitting channels can independently provide current for the ground; the output loop can also be connected in cascade (series) to supply power to the ground so as to provide higher output voltage; or the method of connecting the output ends in parallel is adopted in the area with low grounding resistance to provide larger output current.
A method for sending a dual-frequency induced polarization signal comprises the following steps:
the method comprises the following steps: the double-frequency signal source synchronously generates a high-frequency square wave and a low-frequency square wave, and sends the high-frequency square wave to the high-frequency isolation amplifying circuit and the low-frequency square wave to the low-frequency isolation amplifying circuit;
step two: in each transmitting channel, a high-frequency isolation amplifying circuit electrically isolates and outputs a high-frequency square wave signal generated by a dual-frequency signal source, and a low-frequency isolation amplifying circuit electrically isolates and outputs a low-frequency square wave signal generated by the dual-frequency signal source;
step three: the adder adds the signal output by the high-frequency isolation amplifying circuit and the signal output by the low-frequency isolation amplifying circuit into a double-frequency combined rectangular wave; the number of the connected branches is changed by changing the on-off of a branch switch in the low-pass filter circuit, so that the time constant of the low-pass filter circuit is changed;
step four: the low-pass filter circuit filters the signal output by the adder and then outputs the filtered signal;
step five: the power amplifying circuit amplifies and outputs the signal output by the low-pass filter circuit;
step six: and the signals output by the power amplifying circuits in the transmitting channels are independently or serially connected through the output loop and then supply power to the ground.
Setting a time constant of the low-pass filter circuit according to needs, wherein the output signal of the transmitter at the moment is sampled and then is used as a calibration signal to be calibrated by the receiver, and the calibrated receiver can carry out actual measurement; after switching the low-pass filtering time constant of the sending end, the receiver needs to be calibrated with the sender online, and then actual measurement is carried out; the receivers can be calibrated one by one in advance according to each low-pass filtering time constant of the transmitted waveform, the calibration parameters are stored, the low-pass filtering time constant of the transmitting device is agreed to be consistent with the corresponding calibration gear of the receivers in construction, and then actual measurement can be carried out.
Referring to fig. 5 and 6, the utility model discloses a rectangular wave border low pass filter emulation picture switches low pass filter time constant, can change rectangular wave border change rate, and the output is the ground power supply after the power amplifier, can reduce the electromagnetic coupling interference that the electrical prospecting signal sending terminal arouses by a wide margin.
Referring to FIG. 7, the waveform of FIG. 7u1 is a schematic diagram of the output waveform of the high-frequency square wave signal output by the dual-frequency signal source after isolation and amplification,u2 is a schematic diagram of the output waveform of the low-frequency square wave output by the dual-frequency signal source after isolation and amplification,u3 is the output waveform diagram of the adder (double-frequency combined square wave, frequency ratio S = 13),u4 is a schematic diagram of an output waveform after low-pass filtering,u4 the waveform is amplified with high fidelity and then supplies power to the earth, or the power amplifier of a plurality of signal sending channelsAnd the output ends are cascaded (connected in series) and then output higher and high-voltage double-frequency combined rectangular wave signals to supply power to the ground.
Claims (8)
1. A kind of double frequency excites the electric signal transmitting device, characterized by that: the system comprises a dual-frequency signal source, an output loop for supplying power to the ground and a plurality of sending channels, wherein each sending channel comprises a high-frequency isolation amplifying circuit, a low-frequency isolation amplifying circuit, an adder, a low-pass filter circuit and a power amplifying circuit; in each transmitting channel, the input end of a high-frequency isolation amplifying circuit is connected with a dual-frequency signal source to receive a high-frequency square wave, the input end of a low-frequency isolation amplifying circuit is connected with the dual-frequency signal source to receive a low-frequency square wave, the output end of the high-frequency isolation amplifying circuit and the output end of the low-frequency isolation amplifying circuit are connected with the input end of an adder, and the output end of the adder, a low-pass filter circuit and a power amplifying circuit are sequentially connected in series; and the output ends of the power amplifying circuits of all the transmitting channels are connected with an output loop to supply power to the ground.
2. The dual frequency excited signal transmission device according to claim 1, wherein: the high-frequency isolation amplifying circuit and the low-frequency isolation amplifying circuit have the same structure, the high-frequency isolation amplifying circuit comprises a first resistor, a second resistor, an optical coupler, a first field effect tube and a second field effect tube, one end of the first resistor is used as an input end of the high-frequency isolation amplifying circuit and connected with an output end of the double-frequency signal source, the other end of the first resistor is connected with a 1 st pin of the optical coupler, a 2 nd pin of the optical coupler is grounded, a 4 th pin of the optical coupler is respectively connected with one end of the second resistor, a grid electrode of the first field effect tube and a grid electrode of the second field effect tube, the other end of the second resistor and a source electrode of the first field effect tube are connected with a positive power supply, a 3 rd pin of the optical coupler and a source electrode of the second field effect tube are connected with a negative power supply of the channel, and a drain electrode of the first field effect tube is connected with a drain electrode of the second field effect tube.
3. The dual frequency excited signal transmission device according to claim 2, wherein: the first field effect transistor is a P-channel enhanced field effect transistor, and the second field effect transistor is an N-channel enhanced field effect transistor.
4. The dual frequency excited signal transmission device according to claim 2, wherein: the adder comprises a third resistor, a fourth resistor, a fifth resistor and an operational amplifier, one end of the third resistor is grounded, the other end of the third resistor is connected with the output end and the inverting input end of the operational amplifier, one end of the fourth resistor is connected with the output end of the high-frequency isolation amplifying circuit, one end of the fifth resistor is connected with the output end of the low-frequency isolation amplifying circuit, the other end of the fourth resistor is connected with the other end of the fifth resistor and connected to the non-inverting input end of the operational amplifier, and the output end of the operational amplifier serves as the output end of the adder.
5. The dual frequency excited signal transmission device according to claim 4, wherein: the low-pass filter circuit comprises a capacitor and a first switch, one end of the first switch is used as the input end of the low-pass filter circuit and is connected with the output end of the adder, the other end of the first switch is connected with one end of the capacitor together and is used as the output end of the low-pass filter circuit, the other end of the capacitor is grounded, two ends of the first switch are connected with a plurality of branch circuits in parallel, and each branch circuit comprises a resistor and a switch which are connected in series.
6. The dual frequency excited signal transmission device according to claim 5, wherein: the high-frequency square wave and low-frequency square wave double-frequency signals synchronously generated by the double-frequency signal source are any one of 8Hz and 8/13Hz frequency groups, 4Hz4/13Hz frequency groups, 2Hz2/13Hz frequency groups or 1Hz1/13Hz frequency groups, and the frequency ratio S =13 of the high-frequency signals to the low-frequency signals in each frequency group; or any dual-frequency combined rectangular wave signal with a frequency in the range of 0.01Hz-100Hz and a frequency ratio of S =7 or S =9, 11, 13, 15, 17, 19.
7. The dual frequency excited signal transmission device according to claim 1, wherein: the dual-frequency signal source adopts one of a singlechip, a programmable logic device CPLD, a field programmable gate array device FPGA, a digital signal processor DSP, a direct digital frequency synthesizer DDS and a sequential logic circuit.
8. The dual frequency excited signal transmission device according to claim 1, wherein: the output ends of the power amplifying circuits of all the transmitting channels are independent, or a plurality of power amplifying circuits are connected in series with an output loop to supply power to the ground.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234979A (en) * | 2020-09-04 | 2021-01-15 | 上海鸿晔电子科技股份有限公司 | Crystal oscillator voltage-regulating frequency-modulating circuit and method |
| WO2021197366A1 (en) * | 2020-03-31 | 2021-10-07 | 湖南科技大学 | Electrical prospecting signal sending device and method for suppressing electromagnetic coupling interference |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197366A1 (en) * | 2020-03-31 | 2021-10-07 | 湖南科技大学 | Electrical prospecting signal sending device and method for suppressing electromagnetic coupling interference |
| US11846744B2 (en) | 2020-03-31 | 2023-12-19 | Hunan University Of Science And Technology | Electrical prospecting signal transmission device capable of suppressing electromagnetic coupling interference and electrical prospecting signal transmission method using same |
| CN112234979A (en) * | 2020-09-04 | 2021-01-15 | 上海鸿晔电子科技股份有限公司 | Crystal oscillator voltage-regulating frequency-modulating circuit and method |
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