A microseismic detection signal front-end processing system

Abstract

The present invention discloses a microseismic detection signal front-end processing system, which is characterized in that the system comprises: a detector module for collecting microseismic signals, a detection signal amplification module for receiving the microseismic signals output by the detector module, a detection filter module, a detection conversion module, an analog-to-digital conversion module for converting the microseismic signals into digital signals, a main control module, and a trigger circuit module, a storage circuit module, a communication circuit module and a power supply module all connected to the main control module. Compared with the prior art, the present invention has the functions of early detection and early warning of weak earthquakes induced by mining, enhancing microseismic signals and noise reduction processing, being able to capture weak earthquake detection signals, providing a more accurate data source for subsequent specific analysis of microseismic signals, having a simple circuit structure, ingenious design, convenient use, low cost, and being suitable for application in microseismic detection.

Description

Technical Field

[0001] The invention relates to the technical field of exploration signal processing, in particular to a microseismic detection signal front-end processing system. Background Art

[0002] A microseism is a small earthquake (mine tremor or microseismic). Rock fracture and seismic activity occur during deep mining in underground mines, which is often an inevitable phenomenon. Mining-induced seismic activity is usually defined as those seismic events caused by rock damage due to changes in stress fields in the rock mass near the mining tunnel (Cook, 1976). It occurs naturally during the production process and has the characteristics of low energy and short duration. The total stress state around the mining tunnel is the sum of the additional stress caused by mining and the environmental stress in the rock mass. Studies on the seismic activity induced by underground mining have shown that mine tremors do not necessarily all occur at the mining site, and the maximum magnitude in different regions is also different, but the depth of mine tremors generally corresponds to the depth of mining excavation. Most microseismic events have a frequency between 200-1500Hz, a duration of less than 1s, and a very low energy level, generally between -3 and +1 on the Richter scale. Since microseismic signals are easily shielded or affected by surrounding noise, and during the propagation process, the absorption effect of media such as rocks will also affect their energy to varying degrees.

[0003] Existing technologies have difficulty detecting some weak seismic detection signals, and cannot detect and warn weak earthquakes induced by mining early. Therefore, enhancing microseismic signals and performing noise reduction processing on them are indispensable links in microseismic monitoring, and are also one of the important topics for the future development of microseismic monitoring technology. Summary of the invention

[0004] The purpose of the present invention is to provide a microseismic detection signal front-end processing system in view of the deficiencies in the prior art. The microseismic detection signal front-end processing system is composed of multiple detector modules configured with a detection signal amplification module, a detection filter module, a detection conversion module, an analog-to-digital conversion module, a main control module, a trigger circuit module, a storage circuit module and a communication circuit module. The detection signal amplification module is used to amplify the microseismic signals collected by multiple detectors to achieve effective monitoring and early warning of microseisms. The low-cost signal acquisition and processing circuit effectively enhances the strength and accuracy of the microseismic signals obtained by the detector, and provides a more accurate data source for the subsequent specific analysis of the microseismic signals. The circuit structure is simple, easy to use, low cost, easy to use, and has a good implementation effect. It has certain application prospects in microseismic detection.

[0005] The specific technical solution for achieving the purpose of the present invention is: a microseismic detection signal front-end processing system, which is characterized in that the microseismic detection signal front-end processing system consists of a detector module and a detection signal amplification module, a detection filter module, a detection conversion module, an analog-to-digital conversion module, a main control module, a power supply module, a trigger circuit module, a storage circuit module and a communication circuit module. The detection signal amplification module is used to amplify the microseismic signals collected by multiple detectors to achieve effective monitoring and early warning of microseisms.

[0006] The detector module is connected to the detection signal amplification module, the detection filter module, the detection conversion module, the analog-to-digital conversion module and the main control module in sequence; the trigger circuit module, the storage circuit module and the communication circuit module are respectively connected to the main control module; the power supply module supplies power to the main control module and the detection signal amplification module, the detection filter module and the detection conversion module.

[0007] The detector module is a plurality of detectors arranged at the microseismic acquisition point. The detector module amplifies the collected microseismic signal through the detection signal amplification module and then inputs it into the detection filtering module; the detection filtering module inputs the input microseismic detection signal after filtering and noise reduction processing and then inputs it into the detection conversion module; the detection conversion module converts the filtered microseismic detection signal into an analog signal; the analog-to-digital conversion module converts the input analog signal into a digital signal and then inputs it into the main control module; the main control module sends the processed microseismic signal to the upper computer through the communication circuit module; the trigger circuit module is used to wake up the main control module for front-end signal acquisition and processing; the storage circuit module is used to temporarily store the processed signal.

[0008] The detection signal amplification module includes: an amplifier chip U1, a resistor R2 connected to the IN- pin of the amplifier chip U1, an operational amplifier OP1 whose output end is connected to the resistor R2, a resistor R1 connected to the positive phase input end of the operational amplifier OP1, a resistor R3 connected to the IN+ pin of the amplifier chip U1, an interface J1 for connecting the detector module with the No. 1 pin connected to the resistor R3 and the No. 2 pin connected to the resistor R1, a diode D1 with the negative pole connected to the No. 2 pin of the interface J1 and the positive pole connected to the negative phase power supply, a diode D2 with the positive pole connected to the No. 2 pin of the interface J1 and the negative pole connected to the positive phase power supply after being connected in parallel, and a diode D3 with the positive pole connected to the No. 2 pin of the interface J1 and the negative pole connected to the positive phase power supply. The diode D3, the diode D4 and the diode D5 whose negative poles are connected to the No. 1 pin of the interface J1 and whose positive poles are connected to the negative phase power supply after being connected in parallel, the diode D6 whose positive pole is connected to the No. 1 pin of the interface J1 and whose negative pole is connected to the positive phase power supply, the capacitor C2 and the resistor R6 which are connected in series between the two RG pins of the amplifier chip U1, the resistor R5 whose one end is connected to the REF pin of the discharge chip U1 and whose other end is grounded, the resistor R4 whose one end is connected to the Vout pin of the amplifier chip U1 and whose other end is connected to the detection filter module as an output, and the capacitor C1 whose one end is connected to the output end of the resistor R4 and whose other end is grounded. Among them, the negative phase input end of the operational amplifier OP1 is connected to the output end, the V+ pin of the amplifier chip U1 is connected to the positive phase power supply, and the V- pin is connected to the negative phase power supply.

[0009] The detection filter module includes: a filter chip U2, a resistor R7 and a resistor R8 connected to the +IN pin of the filter chip U2 after being connected in series, a capacitor C3 connected between the resistor R7 and the resistor R8 at one end and connected to both the -IN pin and the OUT pin of the filter chip at the other end, a capacitor C6 connected to the +IN pin of the filter chip U2 at one end and grounded at the other end, a capacitor C7 and a capacitor C8 connected to the V- pin of the filter chip U2 at one end and grounded at the other end after being connected in parallel, and a capacitor C4 and a capacitor C5 connected to the V+ pin of the filter chip U2 at one end and grounded at the other end after being connected in parallel. Among them, the resistor R7 is connected to the detection signal amplification module as an input, the OUT pin of the filter chip U2 is connected to the detection conversion module as an output, the V- pin of the filter chip U2 is connected to the negative phase power supply, and the V+ pin is connected to the positive phase power supply.

[0010] The detection conversion module includes: a capacitor C9 connected to the detection filter module as an input, a resistor R9 and a resistor R10 both connected to the capacitor C9 at one end, an operational amplifier OP2 connected to the positive phase input end and the other end of the resistor R9, a resistor R15 connected to the output end of the operational amplifier OP2 at one end, a resistor R12 connected between the negative phase input end and the output end of the operational amplifier OP2, an operational amplifier OP3 connected to the positive phase input end and the other end of the resistor R10, a resistor R16 connected to the output end of the operational amplifier OP3 at one end, and a resistor R17 connected to the negative phase input end and the output end of the operational amplifier OP3. A resistor R14 between the phase input and output, a resistor R13 connected between the output of the operational amplifier OP2 and the negative phase input of the operational amplifier OP3, a resistor R11 connected between the negative phase input of the operational amplifier OP2 and the positive phase input of the operational amplifier OP3, a capacitor C10 connected between the positive phase input of the operational amplifier OP2 and the positive phase input of the operational amplifier OP3, a capacitor C11 having one end connected to the -5V power supply of the operational amplifier OP2 and the other end grounded, and a capacitor C12 having one end connected to the +5V power supply of the operational amplifier OP2 and the other end grounded. The positive phase input of the operational amplifier OP3 is grounded, and the outputs of the resistors R15 and R16 are the P3+ and P3- outputs connected to the analog-to-digital conversion module, respectively.

[0011] The analog-to-digital conversion module includes a conversion and conditioning circuit connected to the detection conversion module for receiving the amplified microseismic detection signal, and an analog-to-digital converter connected to the conversion and conditioning circuit and to the main control module.

[0012] The conversion and conditioning circuit includes: a resistor R17 as an input terminal P3+ receiving a positive output signal of a detection conversion module, a resistor R19 having one end connected to the input terminal of the resistor R17 and the other end being grounded, a capacitor C13 having one end connected to the output terminal of the resistor R17 and the other end being grounded, a resistor R18 having one end connected to the output terminal of the resistor R17 and the other end being an output AINP, a resistor R21 as an input terminal P3- receiving a negative output signal of the detection conversion module, a resistor R20 having one end connected to the input terminal of the resistor R21 and the other end being grounded, a capacitor C14 having one end connected to the output terminal of the resistor R21 and the other end being grounded, a resistor R22 having one end connected to the output terminal of the resistor R21 and the other end being an output AINN, a capacitor C15 connected between the output AINP of the resistor R18 and the output AINN of the resistor R22, and a rectifier bridge composed of diodes D7, D8, D9, and D10 connected between the output AINP of the resistor R18 and the output AINN of the resistor R22. Among them, the other two ends of the rectifier bridge are connected to 2.5V positive and negative phase power supplies respectively.

[0013] The analog-to-digital converter adopts a high-resolution and high-speed analog-to-digital converter of model ADS1672.

[0014] The main control module adopts a programmable 32-bit single-chip microcomputer.

[0015] The trigger circuit module includes: a trigger chip model IC555, one end of which is connected in parallel to the 4# and 8# pins of the IC555 chip, and the other end is connected to the output terminal V O The resistors R23 and R24 connected to the IC555 chip, the grounding capacitor C16 connected to the 5# pin of the IC555 chip, and the grounding capacitor C17 connected to the 7# pin of the IC555 chip. The 3#, 6#, and 7# pins of the IC555 chip are connected to the output terminal V O ; Pin 2# of the IC555 chip is connected to the input terminal Vin; Pins 4# and 8# of the IC555 chip are connected to the power supply VDD; The trigger circuit module adopts a trigger with the IC555 chip as the core, and the trigger signal of the trigger comes from the operating voltage signal of the detector.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects and significant improvements:

[0017] 1) Multiple geophones are configured to detect microseismic events, and the signal acquisition and processing circuits effectively enhance the strength and accuracy of the microseismic signals obtained by the geophones, providing a more accurate data source for subsequent specific analysis of the microseismic signals. The circuit has a simple structure, ingenious design, easy use, and low cost, and is suitable for application in microseismic detection.

[0018] 2) The circuit for enhancing microseismic signals and performing noise reduction processing can capture weak seismic detection signals and provide early detection and early warning for weak earthquakes induced by mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is the circuit diagram of the detection signal amplification module;

[0021] Figure 3 This is the circuit diagram of the detection and filtering module;

[0022] Figure 4 This is the circuit diagram of the detection conversion module;

[0023] Figure 5 It is the conversion conditioning circuit diagram;

[0024] Figure 6 is the block diagram of the analog-to-digital converter circuit;

[0025] Figure 7 This is the circuit diagram of the trigger circuit module. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and examples. The embodiments of the present invention include but are not limited to the following examples.

[0027] Example 1

[0028] See also Figure 1 The present invention is composed of a detector module 1 for collecting microseismic signals, a detection signal amplification module 2 for receiving the microseismic signals output by the detector module 1, a detection filter module 3, a detection conversion module 4, an analog-to-digital conversion module 5, a main control module 6, a power supply module 7, a trigger circuit module 8, a storage circuit module 9 and a communication circuit module 10.

[0029] The detector module 1 is a module composed of several detectors 1-n arranged at the microseismic acquisition point; the detector module 1 is connected with the detection signal amplification module 2, the detection filter module 3, the detection conversion module 4, the analog-to-digital conversion module 5 and the main control module 6 in sequence; the trigger circuit module 8, the storage circuit module 9 and the communication circuit module 10 are respectively connected with the main control module 6; the power supply module 7 supplies power to the main control module 6 and the detection signal amplification module 2, the detection filter module 3 and the detection conversion module 4; the detector module 1 amplifies the collected microseismic signal by the detection signal amplification module 2 and then outputs it Input detection filter module 3; the detection filter module 3 inputs the input microseismic detection signal into the detection conversion module 4 after filtering and noise reduction; the detection conversion module 4 converts the filtered microseismic detection signal into an analog signal; the analog-to-digital conversion module 5 converts the input analog signal into a digital signal and inputs it into the main control module 6; the main control module 6 sends the processed microseismic signal to the host computer 11 through the communication circuit module 10; the trigger circuit module 8 is used to wake up the main control module 6 for front-end signal acquisition and processing; the storage circuit module 9 is used to temporarily store the processed signal.

[0030] See also Figure 2The detection signal amplification module 2 includes: an amplifier chip U1 of model AD8221, a resistor R2 connected to the IN- pin of the amplifier chip U1 at one end, an operational amplifier OP1 connected to the other end of the resistor R2 at the output end, a resistor R1 connected to the positive phase input end of the operational amplifier OP1 at one end, a resistor R3 connected to the IN+ pin of the amplifier chip U1 at one end, an interface J1 for connecting the detector module connected to the other end of the resistor R1 at the other end of the resistor R3, a diode D1 connected to the No. 2 pin of the interface J1 and the positive pole to the -3.3V power supply, and a diode D1 connected in parallel to the No. 2 pin of the interface J1 and the negative pole to the No. 2 pin of the diode D1. The diodes D2 and D3 are connected to +3.3V power supply, the diodes D4 and D5 are connected in parallel with the negative poles connected to the No. 1 pin of the interface J1 and the positive poles connected to the negative phase power supply, the diode D6 is connected to the No. 1 pin of the interface J1 and the negative pole is connected to the positive phase power supply, the capacitor C2 and the resistor R6 are connected in series between the two RG pins of the amplifier chip U1, the resistor R5 is connected to the REF pin of the discharge chip U1 at one end and the other end is grounded, the resistor R4 is connected to the Vout pin of the amplifier chip U1 at one end and the other end is connected to the detection filter module as the output P1, and the capacitor C1 is connected to the output end of the resistor R4 at one end and the other end is grounded. Among them, the negative phase input end of the operational amplifier OP1 is connected to the output end, the V+ pin of the amplifier chip U1 is connected to the positive phase power supply, and the V- pin is connected to the negative phase power supply, the positive phase power supply is +3.3V, and the negative phase power supply is -3.3V; the operational amplifier OP1 adopts an operational amplifier of model OPA350.

[0031] See also Figure 3 , the detection filter module 3 includes: an operational amplifier of model OPA189 as the filter chip U2, resistors R7 and R8 connected in series to the +IN pin of the filter chip U2, a capacitor C3 connected between resistors R7 and R8 at one end and connected to both the -IN pin and OUT pin of the filter chip at the other end, a capacitor C6 connected to the +IN pin of the filter chip U2 at one end and grounded at the other end, capacitors C7 and C8 connected to the V- pin of the filter chip U2 at one end and grounded at the other end after being connected in parallel, and capacitors C4 and C5 connected to the V+ pin of the filter chip U2 at one end and grounded at the other end after being connected in parallel. Among them, the resistor R7 is connected to the detection signal amplification module 2 as the input P1, the OUT pin of the filter chip U2 is connected to the detection conversion module 4 as the output P2, the V- pin of the filter chip U2 is connected to the negative phase power supply, and the V+ pin is connected to the positive phase power supply, the positive phase power supply is +12V, and the negative phase power supply is -12V.

[0032] See also Figure 4The detection conversion module 4 includes: a capacitor C9 connected to the detection filter module 3 as an input P2, a resistor R9 and a resistor R10 both connected to the capacitor C9 at one end, an operational amplifier OP2 connected to the positive phase input terminal and the other end of the resistor R9, a resistor R15 connected to the output end of the operational amplifier OP2 at one end, a resistor R12 connected between the negative phase input terminal and the output end of the operational amplifier OP2, an operational amplifier OP3 connected to the positive phase input terminal and the other end of the resistor R10, a resistor R16 connected to the output end of the operational amplifier OP3, and a resistor R17 connected to the output end of the operational amplifier OP3. A resistor R14 between the negative phase input and output of OP3, a resistor R13 connected between the output of op amp OP2 and the negative phase input of op amp OP3, a resistor R11 connected between the negative phase input of op amp OP2 and the positive phase input of op amp OP3, a capacitor C10 connected between the positive phase input of op amp OP2 and the positive phase input of op amp OP3, a capacitor C11 having one end connected to the negative power supply of op amp OP2 and the other end grounded, and a capacitor C12 having one end connected to the positive power supply of op amp OP2 and the other end grounded. Among them, the positive phase input of op amp OP3 is grounded, and resistors R15 and R16 are connected to the output terminal P3+ and the output terminal P3-, respectively, and the analog-to-digital conversion module 5. The op amps OP2 and OP3 both use operational amplifiers with signals of TL072, and their positive / negative power supply terminals are connected to positive and negative 5V power supplies.

[0033] The analog-to-digital conversion module 5 includes a conversion and conditioning circuit 5 - 1 connected to the detection conversion module for receiving the amplified microseismic detection signal, and an analog-to-digital converter 5 - 2 connected to the conversion and conditioning circuit and to the main control module 6 .

[0034] See also Figure 5 The conversion and conditioning circuit 5-1 includes: a resistor R17 as an input terminal P3+ receiving the positive output signal of the detection conversion module 4, a resistor R19 having one end connected to the input terminal of the resistor R17 and the other end connected to ground, a capacitor C13 having one end connected to the output terminal of the resistor R17 and the other end connected to ground, a resistor R18 having one end connected to the output terminal of the resistor R17 and the other end used as the output AINP, a resistor R21 as an input terminal P3- receiving the negative output signal of the detection conversion module 4, a capacitor C13 having one end connected to the input terminal of the resistor R21 and the other end connected to ground A resistor R20, a capacitor C14 having one end connected to the output end of the resistor R21 and the other end grounded, a resistor R22 having one end connected to the output end of the resistor R21 and the other end serving as the output AINN, a capacitor C15 connected between the output AINP of the resistor R18 and the output AINN of the resistor R22, and a rectifier bridge composed of diodes D7, D8, D9, and D10 connected between the output AINP of the resistor R18 and the output AINN of the resistor R22, the other two ends of the rectifier bridge being respectively connected to 2.5V positive and negative phase power supplies.

[0035] See also Figure 6The analog-to-digital converter 5-2 adopts a high-resolution and high-speed analog-to-digital converter model ADS1672.

[0036] The main control module 6 adopts a programmable 32-bit single-chip microcomputer.

[0037] See also Figure 7 The trigger circuit module 8 includes: a trigger chip model IC555, one end of which is connected in parallel to the 4# and 8# pins of the IC555 chip, and the other end is connected to the output terminal V O The resistors R23 and R24 connected to the IC555 chip, the grounding capacitor C16 connected to the 5# pin of the IC555 chip, and the grounding capacitor C17 connected to the 7# pin of the IC555 chip. The 3#, 6#, and 7# pins of the IC555 chip are connected to the output terminal V O ; Pin 2# of the IC555 chip is connected to the input terminal Vin; pins 4# and 8# of the IC555 chip are connected to the power supply VDD; the trigger circuit module 8 adopts a trigger with the IC555 chip as the core, and its trigger signal comes from the operating voltage signal of the detector.

[0038] Each electronic component in the present invention adopts existing commercially available components, and the circuit connection relationship and signal connection relationship thereof can be assembled by referring to the instruction manual of the corresponding component, which will not be described in detail in this embodiment.

[0039] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any changes made by adopting the design principles of the present invention and performing non-creative work on this basis should fall within the protection scope of the present invention.

Claims

1. A microseismic geophone signal front-end processing system, Features The microseismic detection signal front-end processing system is composed of a detector module and a detection signal amplification module, a detection filter module, a detection conversion module, an analog-to-digital conversion module, a main control module, a power supply module, a trigger circuit module, a storage circuit module and a communication circuit module. The detection signal amplification module is used to amplify the microseismic signals collected by multiple detectors to achieve effective monitoring and early warning of microseisms. The detector module is a module composed of several detectors; the detector module is connected to the detection signal amplification module, the detection filter module, the detection conversion module, the analog-to-digital conversion module and the main control module in sequence; the trigger circuit module, the storage circuit module and the communication circuit module are respectively connected to the main control module; the power supply module is connected to the main control module with The detector module amplifies the collected microseismic signal through the detection signal amplification module, the detection filter module and the detection conversion module; the detection filter module inputs the input microseismic detection signal into the detection conversion module after filtering and noise reduction; the detection conversion module converts the filtered microseismic detection signal into an analog signal; the analog-to-digital conversion module converts the input analog signal into a digital signal and inputs it into the main control module; the main control module sends the processed microseismic signal to the host computer through the communication circuit module; the trigger circuit module is used to wake up the main control module for front-end signal collection and processing; the storage circuit module is used to temporarily store the processed signal.

2. The microseismic geophone signal front-end processing system according to claim 1, Features The geophones are arranged in multiple locations at the microseismic acquisition points.

3. The microseismic geophone signal front-end processing system according to claim 1, Features The detection signal amplification module includes: an amplifier chip U1, a resistor R2 having one end connected to the IN- pin of the amplifier chip U1 and the other end connected to the negative pole of the operational amplifier OP1, a resistor R1 having one end connected to the positive input terminal of the operational amplifier OP1 and the other end connected to the No. 2 pin of the interface J1, a resistor R3 having one end connected to the IN+ pin of the amplifier chip U1 and the other end connected to the No. 1 pin of the interface J1, a diode D1 having a negative pole connected to the No. 2 pin of the interface J1 and a positive pole connected to a 3.3V negative-phase power supply, a diode D2 and a diode D3 having a positive pole connected to the No. 2 pin of the interface J1 and a positive pole connected to a 3.3V positive-phase power supply after being connected in parallel, a diode D2 and a diode D3 having a negative pole connected to the No. 1 pin of the interface J1 and a positive pole connected to a 3.3V positive-phase power supply after being connected in parallel, The diode D4 and the diode D5 of the negative phase power supply, the positive pole is connected to the pin 1 of the interface J1, and the negative pole is connected to the diode D6 of the 3.3V positive phase power supply, the capacitor C2 and the resistor R6 connected in series between the two RG pins of the amplifier chip U1, one end is connected to the REF pin of the discharge chip U1, and the other end is connected to the grounded resistor R5, one end is connected to the Vout pin of the amplifier chip U1, and the other end is connected to the detection and filtering module as the output P1. The resistor R4, and one end is connected to the output P1, and the other end is connected to the grounded capacitor C1, and the negative phase input terminal of the operational amplifier OP1 is connected to the output terminal; the V+ pin of the amplifier chip U1 is connected to the 3.3V positive phase power supply, and the V- pin is connected to the 3.3V negative phase power supply.

4. The microseismic geophone signal front-end processing system according to claim 1, Features The detection filter module includes: a filter chip U2, a resistor R7 and a resistor R8 connected in series to the +IN pin of the filter chip U2, a capacitor C3 with one end connected between the resistor R7 and the resistor R8 and the other end connected to both the -IN pin and the OUT pin of the filter chip, a capacitor C6 with one end connected to the +IN pin of the filter chip U2 and the other end connected to the ground, a capacitor C7 and a capacitor C8 with one end connected in parallel to the V- pin of the filter chip U2 and the other end connected to the ground, and a capacitor C4 and a capacitor C5 with one end connected in parallel to the V+ pin of the filter chip U2 and the other end connected to the ground, the resistor R7 is connected to the detection signal amplification module as an input P1; the OUT pin of the filter chip U2 is connected to the detection conversion module as an output P2; the V- pin of the filter chip U2 is connected to a 12V negative phase power supply, and the V+ pin is connected to a 12V positive phase power supply.

5. The microseismic geophone signal front-end processing system according to claim 1, Features The detection conversion module includes: a capacitor C9 connected to the detection filter module as an input P2, a resistor R9 and a resistor R10 both of which are connected to the capacitor C9 at one end, an operational amplifier OP2 connected to the positive phase input end and the other end of the resistor R9, a resistor R15 connected to the output end of the operational amplifier OP2, a resistor R12 connected between the negative phase input end and the output end of the operational amplifier OP2, an operational amplifier OP3 connected to the positive phase input end and the other end of the resistor R10, a resistor R16 connected to the output end of the operational amplifier OP3, a resistor R14 connected between the negative phase input end and the output end of the operational amplifier OP3, and a resistor R16 connected to the output end of the operational amplifier OP3. A resistor R13 between the output end and the negative phase input end of the operational amplifier OP3, a resistor R11 connected between the negative phase input end of the operational amplifier OP2 and the positive phase input end of the operational amplifier OP3, a capacitor C10 connected between the positive phase input end of the operational amplifier OP2 and the positive phase input end of the operational amplifier OP3, a capacitor C11 having one end connected to the negative power supply end of the operational amplifier OP2 and the other end grounded, and a capacitor C12 having one end connected to the positive phase power supply end of the operational amplifier OP2 and the other end grounded, and the positive phase input end of the operational amplifier OP3 is grounded; the resistor R15 and the resistor R16 are connected to the output ends P3+ and P3- respectively with the analog-to-digital conversion module.

6. The microseismic geophone signal front-end processing system according to claim 1, Features The analog-to-digital conversion module is provided with a conversion and conditioning circuit connected to the detection and conversion module, and an analog-to-digital converter respectively connected to the conversion and conditioning circuit and the main control module.

7. The microseismic geophone signal front-end processing system according to claim 1, Features The trigger circuit module includes: a trigger chip model IC555, one end of which is connected in parallel to the 4# and 8# pins of the IC555 chip, and the other end is connected to the output terminal V O The resistors R23 and R24 connected to the IC555 chip, the grounding capacitor C16 connected to the 5# pin of the IC555 chip, and the grounding capacitor C17 connected to the 7# pin of the IC555 chip. The 3#, 6#, and 7# pins of the IC555 chip are connected to the output terminal V O ; Pin 2# of the IC555 chip is connected to the input terminal Vin; Pins 4# and 8# of the IC555 chip are connected to the power supply VDD.

8. The microseismic geophone signal front-end processing system according to claim 1, Features The main control module is a programmable 32-bit single-chip microcomputer.

9. The microseismic geophone signal front-end processing system according to claim 6, Features The conversion and conditioning circuit includes: a resistor R17 as an input terminal P3+ receiving a positive output signal of the detection conversion module, a resistor R19 having one end connected to the input terminal of the resistor R17 and the other end connected to ground, a capacitor C13 having one end connected to the output terminal of the resistor R17 and the other end connected to ground, a resistor R18 having one end connected to the output terminal of the resistor R17 and the other end used as an output AINP, a resistor R21 as an input terminal P3- receiving a negative output signal of the detection conversion module, a resistor R20 having one end connected to the input terminal of the resistor R21 and the other end connected to ground, A capacitor C14 having one end connected to the output end of the resistor R21 and the other end grounded, a resistor R22 having one end connected to the output end of the resistor R21 and the other end serving as the output AINN, a capacitor C15 connected between the output AINP of the resistor R18 and the output AINN of the resistor R22, and a rectifier bridge composed of diodes D7, D8, D9, and D10 connected between the output AINP of the resistor R18 and the output AINN of the resistor R22, the other two ends of the rectifier bridge being respectively connected to a 2.5V positive phase power supply and a 2.5V negative phase power supply.

10. The microseismic geophone signal front-end processing system according to claim 6, Features The analog-to-digital converter adopts a high-resolution and high-speed analog-to-digital converter of model ADS1672.

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