Coal mine drilling electromagnetic field monitoring transmitting device and signal transmitting method

Abstract

The application discloses a coal mine drilling electromagnetic field monitoring transmitting device and a signal transmitting method, which comprises signal input circuit, analog conditioning circuit, phase-sensitive detection circuit, system control circuit and signal transmission circuit connected in sequence; the signal input circuit is used for transmitting electromagnetic field signals into the drilling and transmitting the signals to the analog conditioning circuit; the analog conditioning circuit is used for conditioning the electromagnetic field signals, and transmitting the conditioned electromagnetic field signals to the phase-sensitive detection circuit; the phase-sensitive detection circuit is used for modulating the phase and frequency of the conditioned electromagnetic field signals, and transmitting the modulated electromagnetic field signals to the system control circuit; the coal mine drilling electromagnetic field monitoring transmitting device can realize effective transmission of electromagnetic field signals in the drilling, changes the problem that the effective transmission of electromagnetic field signals in the coal mine drilling cannot be realized in the past, and solves the technical problem that the transmission of electromagnetic field signals in the drilling cannot be realized in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of geophysical exploration technology, and relates to a transmitting device, specifically a transmitting device and signal transmitting method for monitoring electromagnetic fields in coal mine boreholes. Background Technology

[0002] Currently, the direct method used for advanced detection of coal mine roadways and tunnels is drilling, while the indirect method is geophysical exploration. Although drilling results are relatively reliable, the construction period is long, the cost is high, there are many blind spots in the exploration, and it has a significant impact on the normal excavation and production of roadways and tunnels.

[0003] With the development of intelligent detection in coal mines and tunnels, current coal mine and tunnel exploration tends to look for small, hidden geological structures. The management of water hazards and gas disasters in coal mine roadways and tunnels is developing from qualitative to quantitative methods. The need for advanced detection at tunneling faces, etc., has put forward the requirements for geophysical exploration to have high detection accuracy and long detection distance.

[0004] Conventional geophysical methods are conducted on the Earth's surface or the surface to be measured. However, due to the complex structure of underground or internal structures of the object being measured, how to effectively transmit electromagnetic field monitoring signals in boreholes is a problem that urgently needs to be solved. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a coal mine borehole electromagnetic field monitoring and transmitting device and signal transmitting method to solve the technical problem that the existing technology cannot realize the transmission of borehole electromagnetic field signals.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A coal mine borehole electromagnetic field monitoring and transmitting device includes a signal input circuit, an analog conditioning circuit, a phase-sensitive detection circuit, a system control circuit, and a signal transmission circuit connected in sequence.

[0008] The signal input circuit is used to emit electromagnetic field signals into the borehole and transmit them to the analog conditioning circuit.

[0009] The analog conditioning circuit is used to condition the electromagnetic field signal, and the conditioned electromagnetic field signal is transmitted to the phase-sensitive detection circuit.

[0010] The phase-sensitive detector circuit is used to modulate the conditioned electromagnetic field signal by phase and frequency selection, and to transmit the modulated electromagnetic field signal to the system control circuit.

[0011] The system control circuit is used to control the transmission of the electromagnetic field signal modulated by the phase-sensitive detector circuit to the signal transmission circuit.

[0012] The signal transmission circuit is used to receive electromagnetic field signals transmitted by the system control circuit, compress them, and then transmit them remotely.

[0013] This invention also includes the following technical features:

[0014] The signal input circuit includes an operational amplifier IC21, resistors R21, R22, R23, R24, R25, R26, and R27, capacitors C21, C22, C23, C24, C25, C26, and C27, power supplies V21, V22, V23, and V24, and diodes D21 and D22. Specifically, the first terminal of capacitor C21 is connected to power supply V21, and the second terminal of capacitor C21 is connected to the first terminal of resistor R21. The second terminal of resistor R21 is connected to both the non-inverting input terminal of operational amplifier IC21 and the first terminal of resistor R23. The second terminal of resistor R23 is connected to the first terminal of capacitor C23 and the positive terminal of diode D21. The first terminal of resistor R22 is connected to power supply V22, and the second terminal of resistor R22 is connected to the first terminal of capacitor C22. The second terminal of capacitor C22 is connected to the reverse terminal of operational amplifier IC21. The input terminal of the operational amplifier IC21 is connected to the first terminal of capacitor C27. The second terminal of capacitor C27 is connected to the first terminal of resistor R26, and the second terminal of resistor R26 is connected to the positive terminal of diode D22. Pin 6 of operational amplifier IC21 is connected to the first terminal of capacitor C24. The second terminal of capacitor C24 is connected to the first terminal of resistor R24, and the second terminal of resistor R24 ​​is grounded. Pin 7 of operational amplifier IC21 is connected to the first terminal of capacitor C26. The second terminal of capacitor C26 is connected to the first terminal of resistor R25, and the second terminal of resistor R25 is grounded. The positive power supply terminal of operational amplifier IC21 is connected to power supply V23. The negative power supply terminal of operational amplifier IC21 is connected to power supply V24. The output terminal of operational amplifier IC21 is connected to the first terminal of capacitor C25. The second terminal of capacitor C25 is connected to the negative terminals of diodes D21 and D22, and the first terminal of resistor R27. The second terminal of resistor R27 serves as the output terminal of the signal input circuit and is connected to the input terminal of the analog conditioning circuit.

[0015] The analog conditioning circuit includes an operational amplifier IC31, resistors R31, R32, R33, R34, R35, R36, R37, and R38, capacitors C31, C32, C33, C34, and C35, power supplies V31, V32, and V33, diodes D31, D32, and D33, and connector JP31; wherein, the first terminal of capacitor C31 serves as the analog conditioning circuit. The input terminal is connected to the output terminal of the signal input circuit. The second terminal of capacitor C31 is connected to the first terminal of resistor R31. The second terminal of resistor R31 is connected together with the first terminal of resistor R33, the first terminal of capacitor C33, and the non-inverting input terminal of operational amplifier IC31. The second terminal of resistor R33 is connected together with the second terminal of capacitor C33, the cathode of diode D31, and the first terminal of resistor R35. The second terminal of resistor R35 is connected together with the first terminal of resistor R36 and the first terminal of capacitor C35. The second terminal of resistor R36... Pin 1 of connector JP31 and the cathode of diode D33 are connected together, and this common connection point serves as the output of the analog conditioning circuit and the input of the phase-sensitive detector circuit; the first terminal of capacitor C32 is connected to power supply V31, and the second terminal of capacitor C32 is connected to the first terminal of resistor R32; the second terminal of resistor R32 is connected in sequence to the inverting input of operational amplifier IC31, the first terminal of capacitor C34, and the first terminal of resistor R34; the second terminal of capacitor C34 is connected to the second terminal of resistor R34, the cathode of diode D32, and the first terminal of resistor R37; the anode of diode D32 is connected to the output of operational amplifier IC31 and the anode of diode D31; the second terminal of resistor R37 is connected to the second terminal of capacitor C35 and the first terminal of resistor R38; the second terminal of resistor R38 is connected to the anode of diode D33 and pin 2 of connector JP31; the positive power supply terminal of operational amplifier IC31 is connected to power supply V32; the negative power supply terminal of operational amplifier IC31 is connected to power supply V33.

[0016] The phase-sensitive detector circuit includes an operational amplifier IC41, resistors R41, R42, R43, R44, R45, R46, R47, R48, and R49, capacitors C41, C42, C43, C44, C45, C46, ​​C47, C48, and C49, power supplies V41, V42, V43, V44, and V45, and a diode D41; wherein, the first terminal of capacitor C41 is connected to the first terminal of resistor R41 and capacitor D49. The first terminals of capacitor C41 and resistor R41 are connected together, and this common connection point serves as the input terminal of the phase-sensitive detector circuit and the output terminal of the analog conditioning circuit. The second terminal of capacitor C41 is grounded. The second terminal of resistor R41 is connected to power supply V41. The second terminal of capacitor C42 is connected to the non-inverting input terminal of operational amplifier IC41, the first terminal of resistor R44, and the first terminal of resistor R45. The second terminal of resistor R44 is connected to the second terminal of resistor R45, the first terminal of resistor R47, and pin 6 of operational amplifier IC41. The second terminal of resistor R47 is connected to the first terminal of capacitor C48. The first terminal of resistor R42 is connected to power supply V41. Power supply V42 is connected; the second terminal of resistor R42 is connected to the first terminal of capacitor C43, and the first terminals of resistor R43 and capacitor C44 are also connected together; the second terminal of capacitor C43 is grounded; the second terminal of resistor R43 is connected to power supply V43; the second terminal of capacitor C44 is connected to the inverting input terminal of operational amplifier IC41, the first terminals of capacitor C46 and C47 are also connected together; the second terminal of capacitor C46 is connected to the second terminal of capacitor C47, the first terminal of resistor R49 is connected to pin 7 of operational amplifier IC41; the second terminal of resistor R49 is connected to the first terminal of capacitor C49; resistor R... The first terminal of resistor R48 is connected to the output terminal of operational amplifier IC41, and the second terminal of resistor R48 is connected to the positive terminal of diode D41. The negative terminal of diode D41 is connected to the second terminal of capacitor C48 and the second terminal of capacitor C49, and this common connection point serves as the output terminal of the phase-sensitive detector circuit and is connected to the input terminal of the system control circuit. The first terminal of resistor R46 is connected to the positive power supply terminal of operational amplifier IC41, and the second terminal of resistor R46 is connected to power supply V44. The first terminal of capacitor C45 is connected to the negative power supply terminal of operational amplifier IC41, and the second terminal of capacitor C45 is connected to power supply V45.

[0017] The system control circuit includes chip U51, resistors R51, R52, R53, R54, R55, and R56, capacitors C51, C52, C53, C54, C55, and C56, power supply V51, power supply V52, and diode D51. The IN pin of chip U51 serves as the input terminal of the system control circuit and is connected to the output terminal of the phase-sensitive detector circuit. The first terminal of capacitor C51 is connected to power supply V51, and the second terminal of capacitor C51 is connected to the first terminals of capacitors C52 and C53. The second terminal of capacitor C52 is connected to the VDS pin of chip U51. The second terminal of capacitor C53 is connected to the VCS pin of chip U51. The first terminal of resistor R51 is connected to the first terminals of capacitors C54 and C55, and the first terminal of resistor R52. The second terminal of capacitor C54 is grounded. The second terminal of C55 is grounded; the second terminal of resistor R52 is connected to the DGND pin of chip U51; the second terminal of resistor R51 is connected to the AGND pin of chip U51; the first terminal of resistor R53 is connected to the SDA pin of chip U51, the second terminal of resistor R53 is connected to the anode of diode D51, the cathode of diode D51 is connected to the first terminal of resistor R54, the second terminal of resistor R54 is connected to the SDB pin of chip U51; the first terminal of resistor R55 is connected to the SCK pin of chip U51, the second terminal of resistor R55 is connected to the first terminal of capacitor C56, the second terminal of capacitor C56 is connected to the first terminal of resistor R56, the second terminal of resistor R56 is connected to the SCL pin of chip U51; power supply V52 is connected to both the EPP and ERP pins of chip U51; the OUT pin of chip U51 is connected as the output terminal of the system control circuit and the input terminal of the signal transmission circuit.

[0018] The signal transmission circuit includes an operational amplifier IC61, resistors R61, R62, R63, R64, R65, R66, R67, and R68, capacitors C61, C62, and C63, power supplies V61, V62, V63, and V64, and diodes D61, D62, and D63. The first terminal of resistor R61 serves as the input terminal of the signal transmission circuit and is connected to the output terminal of the system control circuit. The second terminal of resistor R61 is connected together with the first terminal of resistor R62 and the first terminal of capacitor C61. The second terminal of resistor R62 is connected to the first terminal of resistor R63 and grounded. The second terminal of resistor R63 is connected to power supply V61. A diode is connected in series with the second terminal of capacitor C61. Transistor D61 and resistor R64 are connected together. The second terminal of resistor R64 is connected to the anode of diode D62 and the non-inverting input of operational amplifier IC61. The cathode of diode D62 is connected in series with capacitor C63, resistor R66, and diode D63. The cathode of diode D63 is connected to the output of operational amplifier IC61. The first terminal of capacitor C62 is connected to power supply V62, and the second terminal of capacitor C62 is connected to the first terminal of resistor R65. The second terminal of resistor R65 is connected to the inverting input of operational amplifier IC61. The first terminal of resistor R67 is connected to the positive power supply terminal of operational amplifier IC61, and the second terminal of resistor R67 is connected to power supply V63. The first terminal of resistor R68 is connected to the negative power supply terminal of operational amplifier IC61, and the second terminal of resistor R68 is connected to power supply V64.

[0019] A signal transmission method, employing the aforementioned coal mine borehole electromagnetic field monitoring and transmitting device, specifically includes the following steps:

[0020] Step 1: The signal input circuit emits an electromagnetic field signal into the borehole and transmits it to the analog conditioning circuit.

[0021] Step 2: The analog conditioning circuit conditions the electromagnetic field signal, and the conditioned electromagnetic field signal is transmitted to the phase-sensitive detection circuit.

[0022] Step 3: The phase-sensitive detector circuit modulates the conditioned electromagnetic field signal by phase and frequency selection, and transmits the modulated electromagnetic field signal to the system control circuit.

[0023] Step 4: The system control circuit controls the phase-sensitive detector circuit to transmit the electromagnetic field signal modulated by the phase-sensitive detector circuit to the signal transmission circuit.

[0024] Step 5: The signal transmission circuit receives the electromagnetic field signal transmitted by the system control circuit, compresses it, and then transmits it remotely.

[0025] Compared with the prior art, the beneficial technical effects of this invention are:

[0026] (I) The electromagnetic field monitoring and transmitting device for coal mine boreholes of the present invention can realize the effective transmission of electromagnetic field signals in boreholes, which changes the previous problem that electromagnetic field signals could not be effectively transmitted in underground coal mine boreholes and solves the technical problem that the existing technology could not realize the transmission of electromagnetic field signals in boreholes.

[0027] (II) When the analog conditioning circuit of the present invention detects system harmonics, it generates a set of harmonic vectors with the same amplitude and opposite phase as the system by relying on power electronic equipment, thereby eliminating system harmonics and making them into sinusoidal waveforms. It can also dynamically compensate reactive power. Its advantages are that the reflection action is fast, the filtering effect of harmonics is good, and the compensation of reactive power is meticulous.

[0028] (III) The phase-sensitive detector circuit in this invention has good stability and high precision. It can accurately measure the transmission time of signals in a circuit while maintaining reliable stability. By using the phase-sensitive detector circuit to measure the timing characteristics of a circuit, signals generated when changes occur within the circuit can be detected, thereby revealing the circuit's timing characteristics. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the electromagnetic field monitoring and transmitting device for coal mine boreholes in this invention.

[0030] Figure 2 This is a schematic diagram of the signal input circuit in this invention;

[0031] Figure 3 This is a schematic diagram of the analog conditioning circuit in this invention;

[0032] Figure 4 This is a schematic diagram of the phase-sensitive detection circuit in this invention;

[0033] Figure 5 This is a schematic diagram of the system control circuit in this invention;

[0034] Figure 6 This is a schematic diagram of the signal transmission circuit in this invention.

[0035] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0036] It should be noted that, in order to avoid signal attenuation and interference during signal transmission, each electromagnetic field strength element and equipotential current element in the coal mine borehole electromagnetic field monitoring transmitter is equipped with a pre-conversion module. The signal processing module enables real-time, connected monitoring and transmits, displays, stores, and analyzes the monitoring signals.

[0037] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.

[0038] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0039] This invention provides a coal mine borehole electromagnetic field monitoring and transmitting device, comprising a signal input circuit, an analog conditioning circuit, a phase-sensitive detection circuit, a system control circuit, and a signal transmission circuit connected in sequence.

[0040] The signal input circuit is used to transmit electromagnetic field signals into the borehole and transmit them to the analog conditioning circuit.

[0041] The analog conditioning circuit is used to condition the electromagnetic field signal, and the conditioned electromagnetic field signal is transmitted to the phase-sensitive detection circuit.

[0042] The phase-sensitive detector circuit is used to modulate the conditioned electromagnetic field signal by phase and frequency selection, and then transmit the modulated electromagnetic field signal to the system control circuit.

[0043] The system control circuit is used to control the transmission of the electromagnetic field signal modulated by the phase-sensitive detector circuit to the signal transmission circuit;

[0044] The signal transmission circuit is used to receive electromagnetic field signals transmitted by the system control circuit, compress them, and then transmit them remotely.

[0045] In the above technical solution, the electromagnetic field monitoring and transmitting device for coal mine boreholes can effectively transmit electromagnetic field signals in the boreholes, changing the previous problem that it was impossible to effectively transmit electromagnetic field signals in underground coal mine boreholes, and solving the technical problem that it was impossible to transmit electromagnetic field signals in boreholes in the existing technology.

[0046] Specifically, the signal input circuit includes operational amplifier IC21, resistors R21, R22, R23, R24, R25, R26, and R27, capacitors C21, C22, C23, C24, C25, C26, and C27, power supplies V21, V22, V23, and V24, and diodes D21 and D22; the operational amplifier IC21 is model LM386. In this configuration, the first terminal of capacitor C21 is connected to power supply V21, the second terminal of capacitor C21 is connected to the first terminal of resistor R21, the second terminal of resistor R21 is connected to both the non-inverting input of operational amplifier IC21 and the first terminal of resistor R23, the second terminal of resistor R23 is connected to the first terminal of capacitor C23, and the second terminal of capacitor C23 is connected to the anode of diode D21. The first terminal of resistor R22 is connected to power supply V22, the second terminal of resistor R22 is connected to the first terminal of capacitor C22, and the second terminal of capacitor C22 is connected to... The inverting input of operational amplifier IC21 is connected to the first terminal of capacitor C27. The second terminal of capacitor C27 is connected to the first terminal of resistor R26, and the second terminal of resistor R26 is connected to the anode of diode D22. Pin 6 of operational amplifier IC21 is connected to the first terminal of capacitor C24. The second terminal of capacitor C24 is connected to the first terminal of resistor R24, and the second terminal of resistor R24 ​​is grounded. Pin 7 of operational amplifier IC21 is connected to the first terminal of capacitor C26. The second terminal of capacitor C26 is connected to the first terminal of resistor R25, and the second terminal of resistor R25 is grounded. The positive power supply terminal of operational amplifier IC21 is connected to power supply V23. The negative power supply terminal of operational amplifier IC21 is connected to power supply V24. The output terminal of operational amplifier IC21 is connected to the first terminal of capacitor C25. The second terminal of capacitor C25 is connected to the cathodes of diodes D21 and D22, and the first terminal of resistor R27. The second terminal of resistor R27 serves as the output terminal of the signal input circuit and is connected to the input terminal of the analog conditioning circuit.

[0047] In the above technical solution, the signal input circuit utilizes the circuit's electromagnetic interference resistance capability as an intermediate part of the circuit system's input and output, thereby enabling the circuit system to achieve electromagnetic compatibility.

[0048] Specifically, the analog conditioning circuit includes operational amplifier IC31, resistors R31, R32, R33, R34, R35, R36, R37, and R38, capacitors C31, C32, C33, C34, and C35, power supplies V31, V32, and V33, diodes D31, D32, and D33, connector JP31, and uses an operational amplifier of model LM741; capacitor C3... 1. The first terminal serves as the input terminal of the analog conditioning circuit and is connected to the output terminal of the signal input circuit. The second terminal of capacitor C31 is connected to the first terminal of resistor R31. The second terminal of resistor R31 is connected together with the first terminal of resistor R33, the first terminal of capacitor C33, and the non-inverting input terminal of operational amplifier IC31. The second terminal of resistor R33 is connected together with the second terminal of capacitor C33, the cathode of diode D31, and the first terminal of resistor R35. The second terminal of resistor R35 is connected together with the first terminal of resistor R36 and the first terminal of capacitor C35 in sequence. The second terminal of resistor R36 is connected to pin 1 of connector JP31 and the cathode of diode D33, and this common connection point serves as the output terminal of the analog conditioning circuit and the input terminal of the phase-sensitive detector circuit; the first terminal of capacitor C32 is connected to power supply V31, and the second terminal of capacitor C32 is connected to the first terminal of resistor R32; the second terminal of resistor R32 is connected in sequence to the inverting input terminal of operational amplifier IC31, the first terminal of capacitor C34, and the first terminal of resistor R34; the second terminal of capacitor C34 is connected to the second terminal of resistor R34. The first terminal of the IC31 is connected to the cathode of the diode D32 and the first terminal of the resistor R37; the anode of the diode D32 is connected to the output terminal of the operational amplifier IC31 and the anode of the diode D31; the second terminal of the resistor R37 is connected to the second terminal of the capacitor C35 and the first terminal of the resistor R38; the second terminal of the resistor R38 is connected to the anode of the diode D33 and the second pin of the connector JP31; the positive power supply terminal of the operational amplifier IC31 is connected to the power supply V32; the negative power supply terminal of the operational amplifier IC31 is connected to the power supply V33.

[0049] In the above technical solution, the analog conditioning circuit integrates the adaptive conditioning circuit and the flexible module, which can realize adaptive amplification, filtering and separation of the individual signal characteristics in the fused signal, which facilitates subsequent signal processing and feature analysis.

[0050] Specifically, the phase-sensitive detector circuit includes operational amplifier IC41, resistors R41, R42, R43, R44, R45, R46, R47, R48, and R49, capacitors C41, C42, C43, C44, C45, C46, ​​C47, C48, and C49, power supplies V41, V42, V43, V44, and V45, and diode D41; it uses an LM386 operational amplifier, and the first terminal of capacitor C41 is connected to the diode... The first terminals of resistor R41 and capacitor C42 are connected together, and this common connection point serves as the input terminal of the phase-sensitive detector circuit and the output terminal of the analog conditioning circuit. The second terminal of capacitor C41 is grounded. The second terminal of resistor R41 is connected to power supply V41. The second terminal of capacitor C42 is connected to the non-inverting input terminal of operational amplifier IC41, the first terminals of resistors R44 and R45. The second terminal of resistor R44 is connected to the second terminal of resistor R45, the first terminal of resistor R47, and pin 6 of operational amplifier IC41. The second terminal of resistor R47 is connected to the first terminal of capacitor C48. The first terminal of resistor R42 is connected to power supply V42. The second terminal of resistor R42 is connected to the first terminal of capacitor C43, the first terminal of resistor R43, and the first terminal of capacitor C44. The second terminal of capacitor C43 is grounded. The second terminal of resistor R43 is connected to power supply V43. The second terminal of capacitor C44 is connected to the inverting input terminal of operational amplifier IC41, the first terminal of capacitor C46, ​​and the first terminal of capacitor C47. The second terminal of capacitor C46 is connected to the second terminal of capacitor C47, the first terminal of resistor R49, and pin 7 of operational amplifier IC41. The second terminal of resistor R49 is connected to the first terminal of capacitor C49. The first terminal of resistor R48 is connected to the output terminal of operational amplifier IC41, and the second terminal of resistor R48 is connected to the anode of diode D41. The cathode of diode D41 is connected to the second terminals of capacitors C48 and C49, and this common connection point serves as the output terminal of the phase-sensitive detector circuit and is connected to the input terminal of the system control circuit. The first terminal of resistor R46 is connected to the positive power supply terminal of operational amplifier IC41, and the second terminal of resistor R46 is connected to power supply V44. The first terminal of capacitor C45 is connected to the negative power supply terminal of operational amplifier IC41, and the second terminal of capacitor C45 is connected to power supply V45.

[0051] In the above technical solution, the phase-sensitive detection circuit is an automatic phase-sensitive detection circuit, which can significantly improve the signal-to-noise ratio while maintaining the performance indicators of the polarimeter.

[0052] Specifically, the system control circuit includes chip U51, resistors R51, R52, R53, R54, R55, and R56, capacitors C51, C52, C53, C54, C55, and C56, power supply V51 and V52, and diode D51. Chip U51 uses a control chip of model VNQ7E100A. The IN pin of chip U51 serves as the input terminal of the system control circuit and is connected to the output terminal of the phase-sensitive detector circuit. The first terminal of capacitor C51 is connected to power supply V51, and the second terminal of capacitor C51 is connected to the first terminals of capacitors C52 and C53. The second terminal of capacitor C52 is connected to the VDS pin of chip U51. The second terminal of capacitor C53 is connected to the VCS pin of chip U51. The first terminal of resistor R51 is connected to the first terminals of capacitors C54, C55, and R52. The second terminal of capacitor C54 is grounded; the second terminal of capacitor C55 is grounded; the second terminal of resistor R52 is connected to the DGND pin of chip U51; the second terminal of resistor R51 is connected to the AGND pin of chip U51; the first terminal of resistor R53 is connected to the SDA pin of chip U51, the second terminal of resistor R53 is connected to the anode of diode D51, the cathode of diode D51 is connected to the first terminal of resistor R54, the second terminal of resistor R54 is connected to the SDB pin of chip U51; the first terminal of resistor R55 is connected to the SCK pin of chip U51, the second terminal of resistor R55 is connected to the first terminal of capacitor C56, the second terminal of capacitor C56 is connected to the first terminal of resistor R56, the second terminal of resistor R56 is connected to the SCL pin of chip U51; power supply V52 is connected to both the EPP and ERP pins of chip U51; the OUT pin of chip U51 is connected as the output terminal of the system control circuit and the input terminal of the signal transmission circuit.

[0053] In the above technical solution, the system control circuit utilizes the technical characteristics of integrated chips and combines the functions of traditional electronic components. While saving money, it not only improves the calculation speed but also reduces the power consumption of the overall circuit per unit time.

[0054] Specifically, the signal transmission circuit includes operational amplifier IC61, resistors R61, R62, R63, R64, R65, R66, R67, R68, capacitors C61, C62, and C63, power supplies V61, V62, V63, and V64, and diodes D61, D62, and D63. Operational amplifier IC61 uses an LM741 model. The first terminal of resistor R61 serves as the input terminal of the signal transmission circuit and is connected to the output terminal of the system control circuit. The second terminal of resistor R61 is connected together with the first terminal of resistor R62 and the first terminal of capacitor C61. The second terminal of resistor R62 is connected to the first terminal of resistor R63 and grounded. The second terminal of resistor R63 is connected to power supply V61. Capacitor C... A diode D61 and a resistor R64 are connected in series at the second terminal of IC61. The second terminal of resistor R64 is connected to the anode of diode D62 and the non-inverting input of operational amplifier IC61. A capacitor C63, a resistor R66, and a diode D63 are connected in series at the cathode of diode D62. The cathode of diode D63 is connected to the output of operational amplifier IC61. The first terminal of capacitor C62 is connected to power supply V62, and the second terminal of capacitor C62 is connected to the first terminal of resistor R65. The second terminal of resistor R65 is connected to the inverting input of operational amplifier IC61. The first terminal of resistor R67 is connected to the positive power supply terminal of operational amplifier IC61, and the second terminal of resistor R67 is connected to power supply V63. The first terminal of resistor R68 is connected to the negative power supply terminal of operational amplifier IC61, and the second terminal of resistor R68 is connected to power supply V64.

[0055] In the above technical solution, the signal transmission circuit has essential functions such as transient voltage suppression. It is mainly used to absorb inductive surge voltage generated when the system is powered off or when the load current is discontinuous. The entire circuit is ingeniously designed, fully functional, and performs well.

[0056] A signal transmission method, employing a coal mine borehole electromagnetic field monitoring transmitting device, specifically includes the following steps:

[0057] Step 1: The signal input circuit emits an electromagnetic field signal into the borehole and transmits it to the analog conditioning circuit.

[0058] Step 2: The analog conditioning circuit conditions the electromagnetic field signal, and the conditioned electromagnetic field signal is transmitted to the phase-sensitive detection circuit.

[0059] Step 3: The phase-sensitive detector circuit modulates the conditioned electromagnetic field signal by phase and frequency selection, and transmits the modulated electromagnetic field signal to the system control circuit.

[0060] Step 4: The system control circuit controls the phase-sensitive detector circuit to transmit the electromagnetic field signal modulated by the phase-sensitive detector circuit to the signal transmission circuit.

[0061] Step 5: The signal transmission circuit receives the electromagnetic field signal transmitted by the system control circuit, compresses it, and then transmits it remotely.

Claims

1. A coal mine borehole electromagnetic field monitoring and transmitting device, characterized in that, It includes a signal input circuit, an analog conditioning circuit, a phase-sensitive detection circuit, a system control circuit, and a signal transmission circuit connected in sequence; The signal input circuit is used to emit electromagnetic field signals into the borehole and transmit them to the analog conditioning circuit. The analog conditioning circuit is used to condition the electromagnetic field signal, and the conditioned electromagnetic field signal is transmitted to the phase-sensitive detection circuit. The phase-sensitive detector circuit is used to modulate the conditioned electromagnetic field signal by phase and frequency selection, and to transmit the modulated electromagnetic field signal to the system control circuit. The system control circuit is used to control the transmission of the electromagnetic field signal modulated by the phase-sensitive detector circuit to the signal transmission circuit. The signal transmission circuit is used to receive electromagnetic field signals transmitted by the system control circuit, compress them, and then transmit them remotely. The signal input circuit includes an operational amplifier IC21, resistors R21, R22, R23, R24, R25, R26, and R27, capacitors C21, C22, C23, C24, C25, C26, and C27, power supplies V21, V22, V23, and V24, and diodes D21 and D22. Specifically, the first terminal of capacitor C21 is connected to power supply V21, and the second terminal of capacitor C21 is connected to the first terminal of resistor R21. The second terminal of resistor R21 is connected to both the non-inverting input terminal of operational amplifier IC21 and the first terminal of resistor R23. The second terminal of resistor R23 is connected to the first terminal of capacitor C23 and the positive terminal of diode D21. The first terminal of resistor R22 is connected to power supply V22, and the second terminal of resistor R22 is connected to the first terminal of capacitor C22. The second terminal of capacitor C22 is connected to the reverse terminal of operational amplifier IC21. The input terminal of the operational amplifier IC21 is connected to the first terminal of capacitor C27. The second terminal of capacitor C27 is connected to the first terminal of resistor R26, and the second terminal of resistor R26 is connected to the positive terminal of diode D22. Pin 6 of operational amplifier IC21 is connected to the first terminal of capacitor C24. The second terminal of capacitor C24 is connected to the first terminal of resistor R24, and the second terminal of resistor R24 ​​is grounded. Pin 7 of operational amplifier IC21 is connected to the first terminal of capacitor C26. The second terminal of capacitor C26 is connected to the first terminal of resistor R25, and the second terminal of resistor R25 is grounded. The positive power supply terminal of operational amplifier IC21 is connected to power supply V23. The negative power supply terminal of operational amplifier IC21 is connected to power supply V24. The output terminal of operational amplifier IC21 is connected to the first terminal of capacitor C25. The second terminal of capacitor C25 is connected to the negative terminals of diodes D21 and D22, and the first terminal of resistor R27. The second terminal of resistor R27 serves as the output terminal of the signal input circuit and is connected to the input terminal of the analog conditioning circuit. The signal transmission circuit includes an operational amplifier IC61, resistors R61, R62, R63, R64, R65, R66, R67, and R68, capacitors C61, C62, and C63, power supplies V61, V62, V63, and V64, and diodes D61, D62, and D63. The first terminal of resistor R61 serves as the input terminal of the signal transmission circuit and is connected to the output terminal of the system control circuit. The second terminal of resistor R61 is connected together with the first terminal of resistor R62 and the first terminal of capacitor C61. The second terminal of resistor R62 is connected to the first terminal of resistor R63 and grounded. The second terminal of resistor R63 is connected to power supply V61. A diode is connected in series with the second terminal of capacitor C61. Transistor D61 and resistor R64 are connected together. The second terminal of resistor R64 is connected to the anode of diode D62 and the non-inverting input of operational amplifier IC61. The cathode of diode D62 is connected in series with capacitor C63, resistor R66, and diode D63. The cathode of diode D63 is connected to the output of operational amplifier IC61. The first terminal of capacitor C62 is connected to power supply V62, and the second terminal of capacitor C62 is connected to the first terminal of resistor R65. The second terminal of resistor R65 is connected to the inverting input of operational amplifier IC61. The first terminal of resistor R67 is connected to the positive power supply terminal of operational amplifier IC61, and the second terminal of resistor R67 is connected to power supply V63. The first terminal of resistor R68 is connected to the negative power supply terminal of operational amplifier IC61, and the second terminal of resistor R68 is connected to power supply V64.

2. The electromagnetic field monitoring and transmitting device for coal mine boreholes as described in claim 1, characterized in that, The analog conditioning circuit includes an operational amplifier IC31, resistors R31, R32, R33, R34, R35, R36, R37, and R38, capacitors C31, C32, C33, C34, and C35, power supplies V31, V32, and V33, diodes D31, D32, and D33, and connector JP31; wherein, the first terminal of capacitor C31 serves as the analog conditioning circuit. The input terminal is connected to the output terminal of the signal input circuit. The second terminal of capacitor C31 is connected to the first terminal of resistor R31. The second terminal of resistor R31 is connected together with the first terminal of resistor R33, the first terminal of capacitor C33, and the non-inverting input terminal of operational amplifier IC31. The second terminal of resistor R33 is connected together with the second terminal of capacitor C33, the cathode of diode D31, and the first terminal of resistor R35. The second terminal of resistor R35 is connected together with the first terminal of resistor R36 and the first terminal of capacitor C35. The second terminal of resistor R36... Pin 1 of connector JP31 and the cathode of diode D33 are connected together, and this common connection point serves as the output of the analog conditioning circuit and the input of the phase-sensitive detector circuit; the first terminal of capacitor C32 is connected to power supply V31, and the second terminal of capacitor C32 is connected to the first terminal of resistor R32; the second terminal of resistor R32 is connected in sequence to the inverting input of operational amplifier IC31, the first terminal of capacitor C34, and the first terminal of resistor R34; the second terminal of capacitor C34 is connected to the second terminal of resistor R34, the cathode of diode D32, and the first terminal of resistor R37; the anode of diode D32 is connected to the output of operational amplifier IC31 and the anode of diode D31; the second terminal of resistor R37 is connected to the second terminal of capacitor C35 and the first terminal of resistor R38; the second terminal of resistor R38 is connected to the anode of diode D33 and pin 2 of connector JP31; the positive power supply terminal of operational amplifier IC31 is connected to power supply V32; the negative power supply terminal of operational amplifier IC31 is connected to power supply V33.

3. The electromagnetic field monitoring and transmitting device for coal mine boreholes as described in claim 1, characterized in that, The phase-sensitive detector circuit includes an operational amplifier IC41, resistors R41, R42, R43, R44, R45, R46, R47, R48, and R49, capacitors C41, C42, C43, C44, C45, C46, ​​C47, C48, and C49, power supplies V41, V42, V43, V44, and V45, and a diode D41; wherein, the first terminal of capacitor C41 is connected to the first terminal of resistor R41 and capacitor D49. The first terminals of capacitor C41 and resistor R41 are connected together, and this common connection point serves as the input terminal of the phase-sensitive detector circuit and the output terminal of the analog conditioning circuit. The second terminal of capacitor C41 is grounded. The second terminal of resistor R41 is connected to power supply V41. The second terminal of capacitor C42 is connected to the non-inverting input terminal of operational amplifier IC41, the first terminal of resistor R44, and the first terminal of resistor R45. The second terminal of resistor R44 is connected to the second terminal of resistor R45, the first terminal of resistor R47, and pin 6 of operational amplifier IC41. The second terminal of resistor R47 is connected to the first terminal of capacitor C48. The first terminal of resistor R42 is connected to power supply V41. Power supply V42 is connected; the second terminal of resistor R42 is connected to the first terminal of capacitor C43, and the first terminals of resistor R43 and capacitor C44 are also connected together; the second terminal of capacitor C43 is grounded; the second terminal of resistor R43 is connected to power supply V43; the second terminal of capacitor C44 is connected to the inverting input terminal of operational amplifier IC41, the first terminals of capacitor C46 and C47 are also connected together; the second terminal of capacitor C46 is connected to the second terminal of capacitor C47, the first terminal of resistor R49 is connected to pin 7 of operational amplifier IC41; the second terminal of resistor R49 is connected to the first terminal of capacitor C49; resistor R... The first terminal of resistor R48 is connected to the output terminal of operational amplifier IC41, and the second terminal of resistor R48 is connected to the positive terminal of diode D41. The negative terminal of diode D41 is connected to the second terminal of capacitor C48 and the second terminal of capacitor C49, and this common connection point serves as the output terminal of the phase-sensitive detector circuit and is connected to the input terminal of the system control circuit. The first terminal of resistor R46 is connected to the positive power supply terminal of operational amplifier IC41, and the second terminal of resistor R46 is connected to power supply V44. The first terminal of capacitor C45 is connected to the negative power supply terminal of operational amplifier IC41, and the second terminal of capacitor C45 is connected to power supply V45.

4. The electromagnetic field monitoring and transmitting device for coal mine boreholes as described in claim 1, characterized in that, The system control circuit includes chip U51, resistors R51, R52, R53, R54, R55, and R56, capacitors C51, C52, C53, C54, C55, and C56, power supply V51, power supply V52, and diode D51. The IN pin of chip U51 serves as the input terminal of the system control circuit and is connected to the output terminal of the phase-sensitive detector circuit. The first terminal of capacitor C51 is connected to power supply V51, and the second terminal of capacitor C51 is connected to the first terminals of capacitors C52 and C53. The second terminal of capacitor C52 is connected to the VDS pin of chip U51. The second terminal of capacitor C53 is connected to the VCS pin of chip U51. The first terminal of resistor R51 is connected to the first terminals of capacitors C54 and C55, and the first terminal of resistor R52. The second terminal of capacitor C54 is grounded. The second terminal of C55 is grounded; the second terminal of resistor R52 is connected to the DGND pin of chip U51; the second terminal of resistor R51 is connected to the AGND pin of chip U51; the first terminal of resistor R53 is connected to the SDA pin of chip U51, the second terminal of resistor R53 is connected to the anode of diode D51, the cathode of diode D51 is connected to the first terminal of resistor R54, the second terminal of resistor R54 is connected to the SDB pin of chip U51; the first terminal of resistor R55 is connected to the SCK pin of chip U51, the second terminal of resistor R55 is connected to the first terminal of capacitor C56, the second terminal of capacitor C56 is connected to the first terminal of resistor R56, the second terminal of resistor R56 is connected to the SCL pin of chip U51; power supply V52 is connected to both the EPP and ERP pins of chip U51; the OUT pin of chip U51 is connected as the output terminal of the system control circuit and the input terminal of the signal transmission circuit.

5. A signal transmission method, characterized in that, The coal mine borehole electromagnetic field monitoring transmitting device according to any one of claims 1 to 4 specifically includes the following steps: Step 1: The signal input circuit emits an electromagnetic field signal into the borehole and transmits it to the analog conditioning circuit. Step 2: The analog conditioning circuit conditions the electromagnetic field signal, and the conditioned electromagnetic field signal is transmitted to the phase-sensitive detection circuit. Step 3: The phase-sensitive detector circuit modulates the conditioned electromagnetic field signal by phase and frequency selection, and transmits the modulated electromagnetic field signal to the system control circuit. Step 4: The system control circuit controls the phase-sensitive detector circuit to transmit the electromagnetic field signal modulated by the phase-sensitive detector circuit to the signal transmission circuit. Step 5: The signal transmission circuit receives the electromagnetic field signal transmitted by the system control circuit, compresses it, and then transmits it remotely.

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