Electromagnetic field signal measuring device and method based on stratum propagation for underground coal mine drilling

Abstract

The invention discloses an underground coal mine drilling electromagnetic field signal measuring device and method based on stratum propagation. The device comprises a signal receiving circuit, a signal conditioning circuit, a signal processing circuit, a signal transmission circuit and a power supply circuit. The signal receiving circuit is used for receiving electric signals according to set parameters and transmitting the received signals to the signal conditioning circuit; the signal conditioning circuit is used for conditioning the received signal and transmitting the primarily processed signal to the signal processing circuit; the signal processing circuit receives the signal from the signal conditioning circuit for further processing, and transmits the processed signal to the signal transmission circuit; the power supply circuit supplies power to the signal transmission circuit, the signal transmission circuit modulates signals after receiving the signals, and then the signals are transmitted in an electromagnetic field mode. The device is quick and accurate, can realize two-way communication, can realize real-time and quick acquisition and transmission of measurement signals, and guarantees the accuracy of measurement parameters.

Description

Technical Field

[0001] The present invention belongs to the technical field of receiving electromagnetic field signals in underground coal mine boreholes, and relates to an electromagnetic field signal measuring device and a signal transmission method based on stratum propagation in underground coal mines. Background Art

[0002] To ensure safe and efficient coal mining, a large number of water exploration and gas extraction boreholes are typically constructed underground. To improve borehole quality, measurement-while-drilling (MWD) systems are being used on various directional drill rigs in coal mines to measure parameters such as borehole trajectory to guide borehole design and construction. Currently, MWD trajectory and other parameter information in coal mines is transmitted to the borehole mouth via a wired method using a specially manufactured cable-type drill pipe. However, the processing of cable-type drill pipe is complex and expensive, and its transmission quality is significantly affected by the sealing condition of the joints. Existing wireless MWD technologies often use mud pulses as the transmission channel. However, mud pulse MWD technology is not suitable for air, foam, and unbalanced drilling, has a low transmission rate, and only allows one-way communication. Summary of the Invention

[0003] In response to the deficiencies in the prior art, the purpose of the present invention is to provide a device and method for measuring electromagnetic field signals based on stratum propagation in underground coal mine drilling. The device is fast, accurate and capable of two-way communication, which can realize real-time and rapid acquisition and transmission of measurement signals and ensure the accuracy of measurement parameters.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A device for measuring electromagnetic field signals propagated in underground coal mine boreholes based on stratum propagation, the device comprising a signal receiving circuit, a signal conditioning circuit, a signal processing circuit, a signal transmission circuit, and a power supply circuit; the signal receiving circuit is connected to the signal conditioning circuit, the signal conditioning circuit is connected to the signal processing circuit, the signal processing circuit is connected to the signal transmission circuit, and the signal transmission circuit is connected to the power supply circuit;

[0006] The signal receiving circuit is used to receive electrical signals according to set parameters and transmit the received signals to the signal conditioning circuit; the signal conditioning circuit conditions the received signals and transmits the preliminarily processed signals to the signal processing circuit; the signal processing circuit receives the signals from the signal conditioning circuit, further processes the received signals, and transmits the processed signals to the signal transmission circuit; the power supply circuit supplies power to the signal transmission circuit, and the signal transmission circuit modulates the signals after receiving the signals, and then transmits the signals through an electromagnetic field.

[0007] The present invention also includes the following technical features:

[0008] Specifically, the signal receiving circuit can receive voltage and current signals; the signal receiving circuit includes: resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, capacitor C21, transistor Q21, transistor Q22, transistor Q23, connector JP2, integrated chip U2, power supply VCC21;

[0009] The DATA terminal of the connector JP2 is connected to the No. 16 pin of the integrated chip U2; the AGND terminal of the connector JP2 is connected to the No. 8 pin of the integrated chip U2 and is grounded; one end of the resistor R21 is connected to the power supply VCC21, and the second end of the resistor R21 is connected to the collector of the transistor Q21; the emitter of the transistor Q21 is grounded; the base of the transistor Q21 is connected to the first end of the capacitor C21; one end of the resistor R22 is connected to the No. 14 pin of the integrated chip U2, and the second end of the resistor R22 is connected to the second end of the capacitor C21; One end of resistor R23 is connected to pin 12 of the integrated chip U2, and a second end of resistor R23 is connected to the base of transistor Q22; the emitter of transistor Q22 is grounded, and the collector of transistor Q22 is connected to the first end of resistor R25; the second end of resistor R25 is connected to the first end of resistor R26 and serves as the output end of the signal receiving circuit and the input end of the signal conditioning circuit; the second end of resistor R26 is connected to the collector of transistor Q23; the base of transistor Q23 is connected to pin 9 of the integrated chip U2, and the emitter of transistor Q23 is grounded.

[0010] Specifically, the signal conditioning circuit can receive voltage and current signals; the signal receiving circuit includes: resistor R31, resistor R32, resistor R33, resistor R34, resistor R35, resistor R36, resistor R37, resistor R38, resistor R39, capacitor C31, capacitor C32, capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor C37, power supply V31, power supply V32, power supply V33, power supply V34, operational amplifier IC31, operational amplifier IC32;

[0011] One end of the resistor R31 is connected to the output end of the signal receiving circuit, and the second end of the resistor R31 is connected to the first end of the resistor R32 and the first end of the capacitor C31 respectively; the second end of the capacitor C31 is connected to the non-inverting input end of the operational amplifier IC31 and the first end of the resistor R34 respectively; one end of the resistor R33 is connected to the reverse input end of the operational amplifier IC31, and the second end of the resistor R33 is connected to the second end of the resistor R34 and grounded; the positive power supply end of the operational amplifier IC31 is connected to the power supply V31, and the negative power supply end of the operational amplifier IC31 is connected to the power supply V32; one end of the capacitor C32 is connected to the second end of the resistor R32, the second end of the capacitor C33, and the first end of the resistor R35; the second end of the capacitor C32 is connected to the output end of the operational amplifier IC31 and the first end of the resistor R36; the second end of the resistor R36 is connected to the first end of the resistor R37 and grounded; one end of capacitor C34 is connected to the second end of capacitor C33, and the second end of capacitor C34 is respectively connected to the second end of resistor R37 and the non-inverting input end of operational amplifier IC32; one end of capacitor C36 is respectively connected to the second end of resistor R35 and the first end of capacitor C35, and the second end of capacitor C36 is respectively connected to the output end of operational amplifier IC32 and the first end of capacitor C37; the second end of capacitor C37 is connected to the first end of resistor R38; the inverting input end of operational amplifier IC32 is respectively connected to the second end of resistor R38 and the first end of resistor R39; the positive power supply end of operational amplifier IC32 is connected to power supply V33, and the negative power supply end of operational amplifier IC32 is connected to power supply V34; the second end of resistor R39 is connected to the second end of capacitor C35, and is connected to the input end of the signal processing circuit as the output end of the signal conditioning circuit.

[0012] Specifically, the signal processing circuit can receive voltage and current signals; the signal receiving circuit includes: resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R48, capacitor C41, capacitor C42, capacitor C43, capacitor C44, capacitor C45, capacitor C46, ​​capacitor C47, diode D41, power supply V41, power supply V42, power supply V43, power supply V44, power supply V45, operational amplifier IC41, operational amplifier IC42;

[0013] One end of the capacitor C41 is connected to the first end of the resistor R41 and the output end of the signal conditioning circuit, and the second end of the capacitor C41 is connected to the first end of the resistor R43 and the first end of the capacitor C42 respectively; the second end of the resistor R43 is connected to the positive power supply end of the operational amplifier IC41; the first end of the resistor R42 is connected to the second end of the resistor R41, the second end of the capacitor C42, and the non-inverting input end of the operational amplifier IC41, and the second end of the resistor R42 is connected to the power supply V44; the negative power supply end of the operational amplifier IC41 is connected to the power supply V41; one end of the resistor R44 is connected to the inverting input end of the operational amplifier IC41, and the second end of the resistor R44 is connected to the first end of the resistor R45 and the first end of the capacitor C43 respectively; the second end of the capacitor C43 is connected to the power supply V45 and the first end of the capacitor C44 respectively; the second end of the resistor R45 is connected to the The output end of the operational amplifier IC41, the second end of the capacitor C44, the first end of the capacitor C46, ​​the positive electrode of the diode D41, the first end of the resistor R47, and the reverse input end of the operational amplifier IC42 are connected together; one end of the resistor R46 is connected to the second end of the capacitor C46, ​​and the second end of the resistor R46 is connected to the first end of the resistor C45; the second end of the capacitor C45 is respectively connected to the negative electrode of the diode D41, the second end of the resistor R47, and the first end of the resistor R48; the second end of the resistor R48 is respectively connected to the first end of the capacitor C47 and the non-inverting input end of the operational amplifier IC42; the positive power supply end of the operational amplifier IC42 is connected to the power supply V42, and the negative power supply end of the operational amplifier IC42 is connected to the power supply V43; the second end of the capacitor C47 is connected to the output end of the operational amplifier, and is connected to the input end of the signal transmission circuit as the output end of the signal processing circuit.

[0014] Specifically, the signal transmission circuit can receive voltage and current signals; the signal receiving circuit includes: a resistor R51, a resistor R52, a resistor R53, a resistor R54, a resistor R55, a resistor R56, a resistor R57, a resistor R58, a capacitor C51, a capacitor C52, a capacitor C53, a capacitor C54, a capacitor C55, a capacitor C56, a capacitor C57, a capacitor C58, a diode D51, an operational amplifier IC51, an operational amplifier IC52, a power supply V51, a power supply V52, a power supply V53, a power supply V54, a power supply V55, and an integrated chip U51;

[0015] One end of the resistor R52 is connected to the positive electrode of the diode D51 and to the output end of the signal processing circuit, and the second end of the resistor R52 is respectively connected to the negative electrode of the diode D51, the first end of the capacitor C52, and the first end of the capacitor C53; the second end of the capacitor C52 is respectively connected to the ON pin and the NII pin of the integrated chip U51; the second end of the capacitor C53 is connected to the IN pin of the integrated chip U51; the first end of the resistor R51 is respectively connected to the power supply V51 and the non-inverting input end of the operational amplifier IC51, and the second end of the resistor R51 is grounded; the first end of the resistor R53 is respectively connected to the inverting input end of the operational amplifier IC51 and the first end of the capacitor C51, and the second end of the resistor R53 is grounded; the second end of the capacitor C51 is respectively connected to the output end of the operational amplifier IC51, the GND pin of the integrated chip U51, and the first end of the capacitor C54; the second end of the capacitor C54 is grounded; the positive power supply end of the operational amplifier IC51 is connected to the power supply V52 Connection; the VCC pin of the integrated chip U51 is connected to the power supply V53; one end of the capacitor C55 is connected to the MO pin of the integrated chip U51, and the second end of the capacitor C55 is respectively connected to the first end of the resistor R54, the first end of the resistor R55, the first end of the resistor R57, the first end of the capacitor C57, and the first end of the capacitor C58; the second end of the resistor R54 is grounded; the second end of the resistor R55 is connected to the first end of the capacitor C56; the second end of the capacitor C57 is respectively connected to the inverting input terminal of the operational amplifier IC52 and the first end of the resistor R56; the power supply V54 is connected to the non-inverting input terminal of the operational amplifier IC52; the positive power supply terminal of the operational amplifier IC52 is connected to the power supply V55; the second end of the capacitor C58 is connected to the first end of the resistor R58; the second end of the resistor R58 is grounded; the output terminal of the operational amplifier IC52 is respectively connected to the second end of the capacitor C56, the second end of the resistor R56, and the second end of the resistor R57, and is connected to the power supply circuit.

[0016] Specifically, the power supply circuit can protect the receiving control circuit from operating stably within an allowable voltage range; the power supply circuit includes: a resistor R61, a resistor R62, a resistor R63, a resistor R64, a resistor R65, a capacitor C61, a capacitor C62, a capacitor C63, a capacitor C64, a diode D61, a diode D62, a power supply V41, a power supply V42, a power supply V43, a power supply V61, a power supply V62, a power supply V63, and an integrated chip U61;

[0017] One end of the capacitor C61 is connected to the power supply V61, and the second end of the capacitor C61 is respectively connected to the first end of the resistor R61 and the VDD pin of the integrated chip U61; the second end of the resistor R61 is respectively connected to the DC pin, the VCC pin, and the first end of the resistor R62 of the integrated chip U61; the second end of the resistor R62 is connected to the DC1 pin of the integrated chip U61; the first end of the resistor R63 is connected to the power supply V62, and the second end of the resistor R63 is respectively connected to the ICC pin of the integrated chip U61 and the first end of the capacitor C62; The second end of capacitor C62 is respectively connected to the first end of capacitor C63, the positive electrode of diode D61, the positive electrode of diode D62, the first end of capacitor C64, and the power supply V63; the second end of capacitor C63 is connected to the VSS pin of integrated chip U61; one end of resistor R64 is connected to the OU pin of integrated chip U61, and the second end of resistor R64 is respectively connected to the negative electrode of diode D61 and the first end of resistor R65; the second end of resistor R65 is respectively connected to the negative electrode of diode D62 and the second end of capacitor C64, and is connected to the signal transmission circuit.

[0018] A method for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes is provided. The method is implemented based on the aforementioned device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes, and comprises the following steps:

[0019] Step 1: The signal receiving circuit receives the electromagnetic field signal and transmits the received signal to the signal conditioning circuit;

[0020] Step 2: The signal conditioning circuit receives the signal from the signal receiving circuit, performs preliminary conditioning on the received electromagnetic field signal, and transmits the conditioned signal to the signal processing circuit;

[0021] Step 3: The signal processing circuit receives the signal from the signal conditioning circuit, processes the received signal in a centralized manner, and transmits the processed signal to the signal transmission circuit;

[0022] Step 4: The signal transmission circuit receives the signal from the signal processing circuit, modulates the received signal, and then remotely transmits the modulated signal.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] This invention significantly improves the efficiency of electromagnetic field measurement in underground coal mine boreholes. By using a specific circuit to receive different frequencies, it significantly reduces the efficiency of underground multi-frequency measurement. An anti-interference electromagnetic field measurement device suitable for underground coal mines has been designed, comprising a signal conditioning circuit, a signal processing circuit, a signal transmission circuit, and a power supply circuit. The electromagnetic field receiving device receives signals in the borehole, and then analyzes the signal propagation characteristics to infer the physical properties of the formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the electromagnetic field signal measurement device based on stratum propagation in underground coal mines provided by the present invention.

[0026] Figure 2 This is a schematic diagram of the signal receiving circuit provided by the present invention.

[0027] Figure 3 This is a schematic diagram of the signal conditioning circuit provided by the present invention.

[0028] Figure 4 This is a schematic diagram of the signal processing circuit provided by the present invention.

[0029] Figure 5 This is a schematic diagram of the signal transmission circuit provided by the present invention.

[0030] Figure 6 This is a schematic diagram of the power supply circuit provided by the present invention.

[0031] Figure 7 This is a flow chart of the electromagnetic field signal measurement method based on stratum propagation in underground coal mines provided by the present invention. DETAILED DESCRIPTION

[0032] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0033] Example:

[0034] This embodiment provides a device for measuring electromagnetic field signals propagated in underground coal mine boreholes based on stratum propagation. Figure 1 As shown, the electromagnetic field signal measuring device includes a signal receiving circuit, a signal conditioning circuit, a signal processing circuit, a signal transmission circuit, and a power supply circuit; the signal receiving circuit is connected to the signal conditioning circuit, the signal conditioning circuit is connected to the signal processing circuit, the signal processing circuit is connected to the signal transmission circuit, and the signal transmission circuit is connected to the power supply circuit;

[0035] The signal receiving circuit is used to receive electrical signals according to the set parameters and transmit the received signals to the signal conditioning circuit; the signal conditioning circuit conditions the received signals and transmits the preliminarily processed signals to the signal processing circuit; the signal processing circuit receives the signals from the signal conditioning circuit, further processes the received signals, and transmits the processed signals to the signal transmission circuit; the power supply circuit supplies power to the signal transmission circuit, and the signal transmission circuit modulates the signals after receiving the signals, and then transmits the signals through electromagnetic fields.

[0036] Signal receiving circuit, such as Figure 2 As shown, it can receive voltage and current signals; the signal receiving circuit includes: resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, capacitor C21, transistor Q21, transistor Q22, transistor Q23, connector JP2, integrated chip U2, power supply VCC21; wherein:

[0037] The DATA terminal of the connector JP2 is connected to the 16th pin (DAT terminal) of the integrated chip U2; the AGND terminal of the connector JP2 is connected to the 8th pin (GND terminal) of the integrated chip U2 and is grounded; one end of the resistor R21 is connected to the power supply VCC21, and the second end of the resistor R21 is connected to the collector of the transistor Q21; the emitter of the transistor Q21 is grounded; the base of the transistor Q21 is connected to the first end of the capacitor C21; one end of the resistor R22 is connected to the 14th pin (VC1 terminal) of the integrated chip U2, and the second end of the resistor R22 is connected to the second end of the capacitor C21. One end of the resistor R23 is connected to pin 12 (DIN terminal) of the integrated chip U2, and the second end of the resistor R23 is connected to the base of the transistor Q22; the emitter of the transistor Q22 is grounded, and the collector of the transistor Q22 is connected to the first end of the resistor R25; the second end of the resistor R25 is connected to the first end of the resistor R26 and serves as the output end of the signal receiving circuit and the input end of the signal conditioning circuit; the second end of the resistor R26 is connected to the collector of the transistor Q23; the base of the transistor Q23 is connected to pin 9 (BNN terminal) of the integrated chip U2, and the emitter of the transistor Q23 is grounded;

[0038] The signal receiving circuit can receive the electromagnetic field signal from the receiving antenna in real time, improve the signal receiving efficiency, improve the accuracy of the received signal, and avoid interference from other external factors on the signal receiving process.

[0039] Signal conditioning circuits such as Figure 3 As shown, it can receive voltage and current signals; the signal receiving circuit includes: resistor R31, resistor R32, resistor R33, resistor R34, resistor R35, resistor R36, resistor R37, resistor R38, resistor R39, capacitor C31, capacitor C32, capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor C37, power supply V31, power supply V32, power supply V33, power supply V34, operational amplifier IC31, operational amplifier IC32, and the model of operational amplifier IC31 and operational amplifier IC32 are both LM741; wherein:

[0040] One end of the resistor R31 is connected to the output end of the signal receiving circuit, and the second end of the resistor R31 is connected to the first end of the resistor R32 and the first end of the capacitor C31 respectively; the second end of the capacitor C31 is connected to the non-inverting input end of the operational amplifier IC31 and the first end of the resistor R34 respectively; one end of the resistor R33 is connected to the reverse input end of the operational amplifier IC31, and the second end of the resistor R33 is connected to the second end of the resistor R34 and grounded; the positive power supply end of the operational amplifier IC31 is connected to the power supply V31, and the negative power supply end of the operational amplifier IC31 is connected to the power supply V32; one end of the capacitor C32 is connected to the second end of the resistor R32, the second end of the capacitor C33, and the first end of the resistor R35; the second end of the capacitor C32 is connected to the output end of the operational amplifier IC31 and the first end of the resistor R36, and the second end of the resistor R36 is connected to the first end of the resistor R37 and grounded; one end of capacitor C34 is connected to the second end of capacitor C33, and the second end of capacitor C34 is respectively connected to the second end of resistor R37 and the non-inverting input end of operational amplifier IC32; one end of capacitor C36 is respectively connected to the second end of resistor R35 and the first end of capacitor C35, and the second end of capacitor C36 is respectively connected to the output end of operational amplifier IC32 and the first end of capacitor C37; the second end of capacitor C37 is connected to the first end of resistor R38; the inverting input end of operational amplifier IC32 is respectively connected to the second end of resistor R38 and the first end of resistor R39; the positive power supply end of operational amplifier IC32 is connected to power supply V33, and the negative power supply end of operational amplifier IC32 is connected to power supply V34; the second end of resistor R39 is connected to the second end of capacitor C35, and is connected to the input end of the signal processing circuit as the output end of the signal conditioning circuit.

[0041] Signal processing circuits such as Figure 4 As shown, it can receive voltage and current signals; the signal receiving circuit includes: resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R48, capacitor C41, capacitor C42, capacitor C43, capacitor C44, capacitor C45, capacitor C46, ​​capacitor C47, diode D41, power supply V41, power supply V42, power supply V43, power supply V44, power supply V45, operational amplifier IC41, operational amplifier IC42, and the model of operational amplifier IC41 and operational amplifier IC42 are both LM1458; wherein:

[0042] One end of the capacitor C41 is connected to the first end of the resistor R41 and the output end of the signal conditioning circuit, and the second end of the capacitor C41 is connected to the first end of the resistor R43 and the first end of the capacitor C42 respectively; the second end of the resistor R43 is connected to the positive power supply terminal of the operational amplifier IC41; the first end of the resistor R42 is connected to the second end of the resistor R41, the second end of the capacitor C42, and the non-inverting input terminal of the operational amplifier IC41 respectively, and the second end of the resistor R42 is connected to the power supply V44; the negative power supply terminal of the operational amplifier IC41 is connected to the power supply V41; one end of the resistor R44 is connected to the inverting input terminal of the operational amplifier IC41, and the second end of the resistor R44 is connected to the first end of the resistor R45 and the first end of the capacitor C43 respectively; the second end of the capacitor C43 is connected to the power supply V45 and the first end of the capacitor C44 respectively; the second end of the resistor R45 is connected to the operational amplifier IC41 respectively. The output end of the operational amplifier IC41, the second end of the capacitor C44, the first end of the capacitor C46, ​​the positive electrode of the diode D41, the first end of the resistor R47, and the reverse input end of the operational amplifier IC42 are connected together; one end of the resistor R46 is connected to the second end of the capacitor C46, ​​and the second end of the resistor R46 is connected to the first end of the resistor C45; the second end of the capacitor C45 is respectively connected to the negative electrode of the diode D41, the second end of the resistor R47, and the first end of the resistor R48; the second end of the resistor R48 is respectively connected to the first end of the capacitor C47 and the non-inverting input end of the operational amplifier IC42; the positive power supply end of the operational amplifier IC42 is connected to the power supply V42, and the negative power supply end of the operational amplifier IC42 is connected to the power supply V43; the second end of the capacitor C47 is connected to the output end of the operational amplifier, and is connected to the input end of the signal transmission circuit as the output end of the signal processing circuit.

[0043] Signal transmission circuits, such as Figure 5 As shown, it can receive voltage and current signals; the signal receiving circuit includes: resistor R51, resistor R52, resistor R53, resistor R54, resistor R55, resistor R56, resistor R57, resistor R58, capacitor C51, capacitor C52, capacitor C53, capacitor C54, capacitor C55, capacitor C56, capacitor C57, capacitor C58, diode D51, operational amplifier IC51, operational amplifier IC52, power supply V51, power supply V52, power supply V53, power supply V54, power supply V55, the model of operational amplifier IC51 is LF347, the model of operational amplifier IC52 is LM148, integrated chip U51, the model of integrated chip U51 is UC3844; wherein:

[0044] One end of resistor R52 is connected to the anode of diode D51 and to the output end of the signal processing circuit, and the second end of resistor R52 is respectively connected to the cathode of diode D51, the first end of capacitor C52, and the first end of capacitor C53; the second end of capacitor C52 is respectively connected to the ON pin and NII pin of integrated chip U51; the second end of capacitor C53 is connected to the IN pin of integrated chip U51; the first end of resistor R51 is respectively connected to the power supply V51 and the non-inverting input end of operational amplifier IC51, and the second end of resistor R51 is grounded; the first end of resistor R53 is respectively connected to the inverting input end of operational amplifier IC51 and the first end of capacitor C51, and the second end of resistor R53 is grounded; the second end of capacitor C51 is respectively connected to the output end of operational amplifier IC51, the GND pin of integrated chip U51, and the first end of capacitor C54; the second end of capacitor C54 is grounded; the positive power supply end of operational amplifier IC51 is connected to power supply V52 The VCC pin of the integrated chip U51 is connected to the power supply V53; one end of the capacitor C55 is connected to the MO pin of the integrated chip U51, and the second end of the capacitor C55 is respectively connected to the first end of the resistor R54, the first end of the resistor R55, the first end of the resistor R57, the first end of the capacitor C57, and the first end of the capacitor C58; the second end of the resistor R54 is grounded; the second end of the resistor R55 is connected to the first end of the capacitor C56; the second end of the capacitor C57 is respectively connected to the inverting input terminal of the operational amplifier IC52 and the first end of the resistor R56; the power supply V54 is connected to the non-inverting input terminal of the operational amplifier IC52; the positive power supply terminal of the operational amplifier IC52 is connected to the power supply V55; the second end of the capacitor C58 is connected to the first end of the resistor R58; the second end of the resistor R58 is grounded; the output terminal of the operational amplifier IC52 is respectively connected to the second end of the capacitor C56, the second end of the resistor R56, and the second end of the resistor R57, and is connected to the power supply circuit.

[0045] Power supply circuit, such as Figure 6 As shown, it can protect the receiving control circuit to operate stably within the allowable voltage range; the power supply circuit includes: resistor R61, resistor R62, resistor R63, resistor R64, resistor R65, capacitor C61, capacitor C62, capacitor C63, capacitor C64, diode D61, diode D62, power supply V41, power supply V42, power supply V43, power supply V61, power supply V62, power supply V63, integrated chip U61, the model of integrated chip U61 is NCP1417; wherein:

[0046] One end of capacitor C61 is connected to power supply V61, and the second end of capacitor C61 is respectively connected to the first end of resistor R61 and the VDD pin of integrated chip U61; the second end of resistor R61 is respectively connected to the DC pin, VCC pin and the first end of resistor R62 of integrated chip U61; the second end of resistor R62 is connected to the DC1 pin of integrated chip U61; the first end of resistor R63 is connected to power supply V62, and the second end of resistor R63 is respectively connected to the ICC pin of integrated chip U61 and the first end of capacitor C62; The second end of C62 is respectively connected to the first end of capacitor C63, the positive electrode of diode D61, the positive electrode of diode D62, the first end of capacitor C64, and the power supply V63; the second end of capacitor C63 is connected to the VSS pin of integrated chip U61; one end of resistor R64 is connected to the OU pin of integrated chip U61, and the second end of resistor R64 is respectively connected to the negative electrode of diode D61 and the first end of resistor R65; the second end of resistor R65 is respectively connected to the negative electrode of diode D62 and the second end of capacitor C64, and is connected to the signal transmission circuit.

[0047] The power supply circuit can protect the receiving control circuit to work under stable voltage conditions and ensure the stable operation of other circuits.

[0048] This embodiment also provides a method for measuring electromagnetic field signals propagated in underground coal mine boreholes based on stratum propagation. This method is based on the above-mentioned device for measuring electromagnetic field signals propagated in underground coal mine boreholes based on stratum propagation. By utilizing the propagation characteristics of the electromagnetic field in the stratum, it can effectively measure the resistivity, dielectric constant and other parameters of the stratum around the borehole, thereby identifying geological anomalies, providing reliable geological data support for coal mining, and preventing geological disasters in advance. Figure 7 As shown, the following steps are included:

[0049] Step 1: The signal receiving circuit receives the electromagnetic field signal. The receiving device collects the electromagnetic field signal after propagation through the formation in real time, including the amplitude, phase, frequency and other information of the signal. Due to the complex downhole environment and the presence of multiple interference sources, anti-interference technologies such as shielding and filtering are required during the acquisition process to ensure that the collected signal is true and reliable and can accurately reflect the formation characteristics. The received signal is then transmitted to the signal conditioning circuit.

[0050] Step 2: The signal conditioning circuit receives the signal from the signal receiving circuit and performs preliminary conditioning on the received electromagnetic field signal. The preliminary conditioning process is to apply a variety of signal processing methods such as digital filtering, spectrum analysis, and time-frequency analysis to the collected original electromagnetic field signal to remove noise interference, extract effective signal features, analyze the change pattern of the signal, and provide data support for geological interpretation. The conditioned signal is then transmitted to the signal processing circuit.

[0051] Step 3: The signal processing circuit receives the signal from the signal conditioning circuit and performs centralized processing on the received signal. The centralized processing is based on the signal data after preliminary processing, and adopts a suitable inversion algorithm, such as the least square method, the conjugate gradient method, etc., to perform inversion calculation on the geological parameters of the formation around the borehole, construct a formation geological parameter distribution model, compare the calculation results with the pre-set geological anomaly judgment standard, and transmit the processed signal to the signal transmission circuit;

[0052] Step 4: The signal transmission circuit receives the signal from the signal processing circuit, modulates the received signal, and then remotely transmits the modulated signal.

[0053] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0055] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes, characterized in that: The electromagnetic field signal measuring device includes a signal receiving circuit, a signal conditioning circuit, a signal processing circuit, a signal transmission circuit, and a power supply circuit; the signal receiving circuit is connected to the signal conditioning circuit, the signal conditioning circuit is connected to the signal processing circuit, the signal processing circuit is connected to the signal transmission circuit, and the signal transmission circuit is connected to the power supply circuit; The signal receiving circuit is used to receive electrical signals according to set parameters and transmit the received signals to the signal conditioning circuit; the signal conditioning circuit conditions the received signals and transmits the preliminarily processed signals to the signal processing circuit; the signal processing circuit receives the signals from the signal conditioning circuit, further processes the received signals, and transmits the processed signals to the signal transmission circuit; the power supply circuit supplies power to the signal transmission circuit, and the signal transmission circuit modulates the signals after receiving the signals, and then transmits the signals through an electromagnetic field.

2. The device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes according to claim 1, characterized in that: The signal receiving circuit can receive voltage and current signals; the signal receiving circuit includes: resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, capacitor C21, transistor Q21, transistor Q22, transistor Q23, connector JP2, integrated chip U2, power supply VCC21; The DATA terminal of the connector JP2 is connected to the No. 16 pin of the integrated chip U2; the AGND terminal of the connector JP2 is connected to the No. 8 pin of the integrated chip U2 and is grounded; one end of the resistor R21 is connected to the power supply VCC21, and the second end of the resistor R21 is connected to the collector of the transistor Q21; the emitter of the transistor Q21 is grounded; the base of the transistor Q21 is connected to the first end of the capacitor C21; one end of the resistor R22 is connected to the No. 14 pin of the integrated chip U2, and the second end of the resistor R22 is connected to the second end of the capacitor C21; One end of resistor R23 is connected to pin 12 of the integrated chip U2, and a second end of resistor R23 is connected to the base of transistor Q22; the emitter of transistor Q22 is grounded, and the collector of transistor Q22 is connected to the first end of resistor R25; the second end of resistor R25 is connected to the first end of resistor R26 and serves as the output end of the signal receiving circuit and the input end of the signal conditioning circuit; the second end of resistor R26 is connected to the collector of transistor Q23; the base of transistor Q23 is connected to pin 9 of the integrated chip U2, and the emitter of transistor Q23 is grounded.

3. The device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes according to claim 1, characterized in that: The signal conditioning circuit can receive voltage and current signals; the signal receiving circuit includes: resistor R31, resistor R32, resistor R33, resistor R34, resistor R35, resistor R36, resistor R37, resistor R38, resistor R39, capacitor C31, capacitor C32, capacitor C33, capacitor C34, capacitor C35, capacitor C36, capacitor C37, power supply V31, power supply V32, power supply V33, power supply V34, operational amplifier IC31, operational amplifier IC32; One end of the resistor R31 is connected to the output end of the signal receiving circuit, and the second end of the resistor R31 is connected to the first end of the resistor R32 and the first end of the capacitor C31 respectively; the second end of the capacitor C31 is connected to the non-inverting input end of the operational amplifier IC31 and the first end of the resistor R34 respectively; one end of the resistor R33 is connected to the reverse input end of the operational amplifier IC31, and the second end of the resistor R33 is connected to the second end of the resistor R34 and grounded; the positive power supply end of the operational amplifier IC31 is connected to the power supply V31, and the negative power supply end of the operational amplifier IC31 is connected to the power supply V32; one end of the capacitor C32 is connected to the second end of the resistor R32, the second end of the capacitor C33, and the first end of the resistor R35; the second end of the capacitor C32 is connected to the output end of the operational amplifier IC31 and the first end of the resistor R36; the second end of the resistor R36 is connected to the first end of the resistor R37 and grounded; one end of capacitor C34 is connected to the second end of capacitor C33, and the second end of capacitor C34 is respectively connected to the second end of resistor R37 and the non-inverting input end of operational amplifier IC32; one end of capacitor C36 is respectively connected to the second end of resistor R35 and the first end of capacitor C35, and the second end of capacitor C36 is respectively connected to the output end of operational amplifier IC32 and the first end of capacitor C37; the second end of capacitor C37 is connected to the first end of resistor R38; the inverting input end of operational amplifier IC32 is respectively connected to the second end of resistor R38 and the first end of resistor R39; the positive power supply end of operational amplifier IC32 is connected to power supply V33, and the negative power supply end of operational amplifier IC32 is connected to power supply V34; the second end of resistor R39 is connected to the second end of capacitor C35, and is connected to the input end of the signal processing circuit as the output end of the signal conditioning circuit.

4. The device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes according to claim 1, characterized in that: The signal processing circuit can receive voltage and current signals; the signal receiving circuit includes: resistor R41, resistor R42, resistor R43, resistor R44, resistor R45, resistor R46, resistor R47, resistor R48, capacitor C41, capacitor C42, capacitor C43, capacitor C44, capacitor C45, capacitor C46, ​​capacitor C47, diode D41, power supply V41, power supply V42, power supply V43, power supply V44, power supply V45, operational amplifier IC41, operational amplifier IC42; One end of the capacitor C41 is connected to the first end of the resistor R41 and the output end of the signal conditioning circuit, and the second end of the capacitor C41 is connected to the first end of the resistor R43 and the first end of the capacitor C42 respectively; the second end of the resistor R43 is connected to the positive power supply end of the operational amplifier IC41; the first end of the resistor R42 is connected to the second end of the resistor R41, the second end of the capacitor C42, and the non-inverting input end of the operational amplifier IC41, and the second end of the resistor R42 is connected to the power supply V44; the negative power supply end of the operational amplifier IC41 is connected to the power supply V41; one end of the resistor R44 is connected to the inverting input end of the operational amplifier IC41, and the second end of the resistor R44 is connected to the first end of the resistor R45 and the first end of the capacitor C43 respectively; the second end of the capacitor C43 is connected to the power supply V45 and the first end of the capacitor C44 respectively; the second end of the resistor R45 is connected to the The output end of the operational amplifier IC41, the second end of the capacitor C44, the first end of the capacitor C46, ​​the positive electrode of the diode D41, the first end of the resistor R47, and the reverse input end of the operational amplifier IC42 are connected together; one end of the resistor R46 is connected to the second end of the capacitor C46, ​​and the second end of the resistor R46 is connected to the first end of the resistor C45; the second end of the capacitor C45 is respectively connected to the negative electrode of the diode D41, the second end of the resistor R47, and the first end of the resistor R48; the second end of the resistor R48 is respectively connected to the first end of the capacitor C47 and the non-inverting input end of the operational amplifier IC42; the positive power supply end of the operational amplifier IC42 is connected to the power supply V42, and the negative power supply end of the operational amplifier IC42 is connected to the power supply V43; the second end of the capacitor C47 is connected to the output end of the operational amplifier, and is connected to the input end of the signal transmission circuit as the output end of the signal processing circuit.

5. The device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes according to claim 1, characterized in that: The signal transmission circuit can receive voltage and current signals; the signal receiving circuit includes: resistor R51, resistor R52, resistor R53, resistor R54, resistor R55, resistor R56, resistor R57, resistor R58, capacitor C51, capacitor C52, capacitor C53, capacitor C54, capacitor C55, capacitor C56, capacitor C57, capacitor C58, diode D51, operational amplifier IC51, operational amplifier IC52, power supply V51, power supply V52, power supply V53, power supply V54, power supply V55, and integrated chip U51; One end of the resistor R52 is connected to the positive electrode of the diode D51 and to the output end of the signal processing circuit, and the second end of the resistor R52 is respectively connected to the negative electrode of the diode D51, the first end of the capacitor C52, and the first end of the capacitor C53; the second end of the capacitor C52 is respectively connected to the ON pin and the NII pin of the integrated chip U51; the second end of the capacitor C53 is connected to the IN pin of the integrated chip U51; the first end of the resistor R51 is respectively connected to the power supply V51 and the non-inverting input end of the operational amplifier IC51, and the second end of the resistor R51 is grounded; the first end of the resistor R53 is respectively connected to the inverting input end of the operational amplifier IC51 and the first end of the capacitor C51, and the second end of the resistor R53 is grounded; the second end of the capacitor C51 is respectively connected to the output end of the operational amplifier IC51, the GND pin of the integrated chip U51, and the first end of the capacitor C54; the second end of the capacitor C54 is grounded; the positive power supply end of the operational amplifier IC51 is connected to the power supply V52 Connection; the VCC pin of the integrated chip U51 is connected to the power supply V53; one end of the capacitor C55 is connected to the MO pin of the integrated chip U51, and the second end of the capacitor C55 is respectively connected to the first end of the resistor R54, the first end of the resistor R55, the first end of the resistor R57, the first end of the capacitor C57, and the first end of the capacitor C58; the second end of the resistor R54 is grounded; the second end of the resistor R55 is connected to the first end of the capacitor C56; the second end of the capacitor C57 is respectively connected to the inverting input terminal of the operational amplifier IC52 and the first end of the resistor R56; the power supply V54 is connected to the non-inverting input terminal of the operational amplifier IC52; the positive power supply terminal of the operational amplifier IC52 is connected to the power supply V55; the second end of the capacitor C58 is connected to the first end of the resistor R58; the second end of the resistor R58 is grounded; the output terminal of the operational amplifier IC52 is respectively connected to the second end of the capacitor C56, the second end of the resistor R56, and the second end of the resistor R57, and is connected to the power supply circuit.

6. The device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes according to claim 1, characterized in that: The power supply circuit can protect the receiving control circuit to operate stably within the allowable voltage range; the power supply circuit includes: resistor R61, resistor R62, resistor R63, resistor R64, resistor R65, capacitor C61, capacitor C62, capacitor C63, capacitor C64, diode D61, diode D62, power supply V41, power supply V42, power supply V43, power supply V61, power supply V62, power supply V63, and integrated chip U61; One end of the capacitor C61 is connected to the power supply V61, and the second end of the capacitor C61 is respectively connected to the first end of the resistor R61 and the VDD pin of the integrated chip U61; the second end of the resistor R61 is respectively connected to the DC pin, the VCC pin, and the first end of the resistor R62 of the integrated chip U61; the second end of the resistor R62 is connected to the DC1 pin of the integrated chip U61; the first end of the resistor R63 is connected to the power supply V62, and the second end of the resistor R63 is respectively connected to the ICC pin of the integrated chip U61 and the first end of the capacitor C62; The second end of capacitor C62 is respectively connected to the first end of capacitor C63, the positive electrode of diode D61, the positive electrode of diode D62, the first end of capacitor C64, and the power supply V63; the second end of capacitor C63 is connected to the VSS pin of integrated chip U61; one end of resistor R64 is connected to the OU pin of integrated chip U61, and the second end of resistor R64 is respectively connected to the negative electrode of diode D61 and the first end of resistor R65; the second end of resistor R65 is respectively connected to the negative electrode of diode D62 and the second end of capacitor C64, and is connected to the signal transmission circuit.

7. A method for measuring electromagnetic field signals based on stratum propagation in underground coal mine drilling, characterized in that: The method is implemented based on the device for measuring electromagnetic field signals propagated through strata in underground coal mine boreholes according to any one of claims 1 to 6, and comprises the following steps: Step 1: The signal receiving circuit receives the electromagnetic field signal and transmits the received signal to the signal conditioning circuit; Step 2: The signal conditioning circuit receives the signal from the signal receiving circuit, performs preliminary conditioning on the received electromagnetic field signal, and transmits the conditioned signal to the signal processing circuit; Step 3: The signal processing circuit receives the signal from the signal conditioning circuit, processes the received signal in a centralized manner, and transmits the processed signal to the signal transmission circuit; Step 4: The signal transmission circuit receives the signal from the signal processing circuit, modulates the received signal, and then remotely transmits the modulated signal.

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