CN210639288U - Quick recognition device of time domain electromagnetism weak polarization effect - Google Patents
Quick recognition device of time domain electromagnetism weak polarization effect Download PDFInfo
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Abstract
The utility model belongs to the technical field of relate to geological exploration, especially, relate to a quick recognition device of time domain electromagnetism weak polarization effect, include: the device comprises an actual measurement signal reading module, a zero point feature extraction module, a main control module, a display module, a synchronization module and a power supply module; the device comprises a zero point characteristic extraction module, an actual measurement signal reading module, a field actual measurement signal processing module and a field actual measurement signal processing module, wherein the actual measurement signal reading module is connected with the input end of the zero point characteristic extraction module and is used for acquiring the electromagnetic response of the field actual measurement; the zero point feature extraction module is connected with the input end of the main control module; the display module is directly connected with the main control module; the synchronization module is directly connected with the main control module and the counter, adopts GPS synchronization and is used for realizing synchronization of the receiver and the transmitter and triggering the counter; the storage module is directly connected with the main control module and adopts a micro SD card; and the power supply module is used for supplying power to the whole time domain weak polarization effect quick identification device. Aiming at the problems of unobvious weak polarization effect characteristics, poor identification precision and the like, the polarization effect can be quickly and effectively identified, the structure is greatly simplified, and the precision is improved.
Description
Technical Field
The utility model belongs to the technical field of relate to geological exploration, especially, relate to a quick recognition device of time domain electromagnetism weak polarization effect.
Background
Induced Polarization Effects (IP) are an important electrochemical phenomenon, usually occurring in metal ores, impregnated mineral resources and water-bearing geology, with extremely high economic value, mainly represented by the phenomena of rapid attenuation and sign reversal of electromagnetic signals. The method for performing multi-parameter joint interpretation on geology by utilizing polarization data is also widely applied to wider fields of searching metal ores, water resources, geothermal resources, karst and the like, and becomes a research hotspot of scholars at home and abroad. However, for unknown geological structures, the judgment is made by visually recognizing whether the measured electromagnetic response data has sign reversal (negative response) single characteristics, in this case, strong polarized media can be mostly distinguished, and for weak polarization or more complex polarization terrains, the visual recognition mode has great subjective assumption and contingency, and has limitation in practical application, and the weak polarization effect can be ignored. Therefore, the rapid and accurate identification of the time domain weak polarization effect is a key problem to be solved urgently.
CN101189533A discloses a method and device for object recognition and classification of electromagnetic signals, provided with an analysis device for analyzing the received signals and a memory for storing characteristic patterns, electromagnetic radiation being emitted by a sensor, the stored patterns being compared with the analyzed signals and the classification of the object being deduced on the basis of this comparison. But mainly aims at the electromagnetic signal to process and classify, and has more complex steps and more complex process. The field identification can not be realized, and the comprehensive grasp of the underground polarization information at the place is not facilitated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a quick recognition device of time domain electromagnetic polarization effect to current weak polarization effect recognition device's not enough.
The utility model discloses a realize like this, a quick recognition device of time domain electromagnetism weak polarization effect, include:
the device comprises an actual measurement signal reading module, a zero point feature extraction module, a main control module, a display module, a synchronization module and a power supply module; wherein the content of the first and second substances,
the actual measurement signal reading module is connected with the input end of the zero point characteristic extraction module and is used for acquiring the electromagnetic response of the field actual measurement; the zero point feature extraction module is connected with the input end of the main control module; the display module is directly connected with the main control module; the synchronization module is directly connected with the main control module and the counter, adopts GPS synchronization and is used for realizing synchronization of the receiver and the transmitter and triggering the counter; the storage module is directly connected with the main control module and adopts a micro SD card; and the power supply module is used for supplying power to the whole time domain weak polarization effect quick identification device.
Furthermore, the actual measurement signal reading module comprises a receiving coil and a front end differential amplification circuit, wherein electromagnetic signals transmitted underground are collected by the receiving coil and then converted into a voltage form, and the voltage form is amplified by the front end differential amplification circuit and enters the next circuit module.
Further, the zero point feature extraction module comprises a zero crossing comparator, a counter and an AD collector, wherein the zero crossing comparator is connected with the output end of the actually measured signal reading module, the high-precision LM311 is selected, the AD collector selects 24-bit ADs1255, and the counter is connected with the zero crossing comparator and used for acquiring the symbol inversion time in the response curve; the AD acquisition circuit is connected between the output end of the actual measurement signal reading module and the main control module, and starts to sample after receiving the synchronous signal of the GPS, and converts the received voltage quantity into a digital quantity readable by the main control module; and meanwhile, the counter starts counting, when the zero-crossing comparator detects the zero-crossing point of the signal, the counter is triggered to stop counting, and the symbol inversion time is calculated according to the counting size of the counter.
Further, the main control module comprises a main controller, and the main controller selects an STM32F103 chip.
Further, the display module adopts a 12864 display screen of 0.96 inches, and mainly displays the identification result, the longitude and latitude of the measurement place, the altitude and the time information.
Furthermore, the synchronous module adopts a GPS circuit with the model of NEO-6 and communicates with the main control module by adopting a universal synchronous asynchronous receiver-transmitter.
Furthermore, the storage module adopts a micro SD card and communicates with the main control module through a universal serial peripheral interface.
Further, the power supply module adopts a mode of combining the low-dropout linear voltage-stabilized power supply module AMS1117-3.3 and the intelligent power supply module TPS767D301, the low-dropout linear voltage-stabilized power supply module AMS1117-3.3 works in a standby mode, and once the receiver is triggered, the intelligent power supply module TPS767D301 supplies power to the whole recognition device.
Compared with the prior art, the utility model, beneficial effect lies in: the utility model provides a transition electromagnetic receiving device specifically is mainly to the unobvious, the poor scheduling problem of discernment precision of weak polarization effect characteristic, can effectively discern the polarization effect fast, has simplified the structure greatly, has solved current naked eye discernment, by the technical problem that the degree of accuracy is low that subjective assumption and contingency brought. Therefore, the utility model discloses successfully provide a scheme, can realize the quick accurate automatic identification of weak polarization effect in the actual exploration, improved electromagnetic data's interpretation precision, reduced the exploration cost.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a fast identification device based on a dual-parameter time domain electromagnetic weak polarization effect;
FIG. 2 is a schematic diagram of a front-end differential amplification circuit;
FIG. 3 is a schematic circuit diagram of a zero feature extraction module;
FIG. 4 is a schematic circuit diagram of a display module;
FIG. 5 is a circuit schematic of a GPS synchronization module;
FIG. 6 is a circuit schematic of a memory module;
FIG. 7 is a schematic circuit diagram of the connection of the main control module and each module;
fig. 8 is a schematic circuit diagram of the combined power module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the utility model provides a quick recognition device of time domain electromagnetism weak polarization effect, include: the actual measurement signal reading module comprises a receiving coil and a front end differential amplification circuit which are connected; the zero point feature extraction module consists of a zero crossing comparator, a counter and an AD (analog-to-digital) collector, wherein the zero crossing comparator is connected with the output end of the actually measured signal reading module, the LM311 with high precision is selected, the AD collector selects 24-bit ADS1255, and the counter is connected with the zero crossing comparator and used for acquiring the symbol inversion time in the response curve; the AD acquisition circuit is connected between the output end of the actually measured signal reading module and the main control module, and is used for acquiring the sign inversion moment in the field actually measured electromagnetic response and converting the voltage signal into a digital quantity readable by the singlechip, wherein the counter adopts an addition counter; the main control module comprises a main controller, adopts an ARM series STM32F103RG as a control chip and is used for acquiring a late-stage slope; the synchronization module adopts GPS synchronization and is used for realizing synchronization of the receiver and the transmitter and triggering the counter; the power supply module adopts a low-voltage difference linear stabilized power supply module AMS1117-3.3 and an intelligent power supply module TPS767D301 combined mode and is used for supplying power to the whole time domain polarization effect rapid identification device; the storage module selects a micro SD card for storage and is used for storing the acquired electromagnetic response result and the like; a key for inputting a command to the entire apparatus; and the display module adopts a 0.96-inch 12864 display screen and is used for displaying a judgment result and the like. The main control module is connected with the front-end differential amplifier through the zero feature extraction module, the front-end differential amplifier is connected with the receiving coil, the synchronization module, the keys and the storage module are directly connected with the main control module, the zero-crossing comparator in the zero feature extraction module is connected with the front-end differential amplifier, the rear end of the zero-crossing comparator in the zero feature extraction module is connected with the counter, the front end of the AD acquisition module is connected with the front-end differential amplifier, and the rear end of the AD acquisition module and the rear end of the counter are connected with the main control module.
When the transmitter is powered on to the underground and the transmitting current is switched off, the synchronous module 8 generates a pulse to the main control module, the receiver starts to work, and the counter starts to count; meanwhile, at the moment of turning off, the current induced by the underground polarizer generates an induction-polarization secondary magnetic field, at the moment, the secondary magnetic field containing the information of the underground polarizer is received by the receiving coil and converted into a voltage form, the signal can reach 25 millivolts, and after being amplified by the front-end differential amplifier, the signal can reach 1 volt (the amplification factor is 40 times); when the signal reaches the zero-crossing comparator, the zero-crossing comparator will generate a pulse to the counter, the counter stops counting, and the main frequency of STM32F103RG is 72MHz, in this embodiment, frequency division is performed by 9, so that the counter period becomes 8MHz, i.e., 1s counts 8M times. Meanwhile, the voltage value of the measured signal is converted into a digital quantity readable by the singlechip through the AD collector.
If the count size is m, then the symbol inversion time in the measured response is:
the result is output to the display screen 12 by the main control module, and the data and the result collected in the whole process are stored in the micro SD card 10, so that the follow-up viewing is facilitated.
Referring to fig. 2, which is a schematic diagram of a front-end differential amplifier circuit, a differential amplifier circuit is formed by placing symmetrical LT1028 and ELH0002 operational amplifier chips (two each) and passing through a chip 79L05Forming a voltage bias circuit, providing +/-7.4V and +/-5V voltages for the amplifying circuit, connecting +/-5V voltages with the ground through the parallel connection of capacitors, and combining a capacitor C at two ends of a feedback resistor between two operational amplifiers in consideration of the influence of impedance and self-excitation1Capacitor C4。
Fig. 3 is a schematic circuit diagram of the zero point feature extraction module, which includes a zero-crossing comparator, a counter, and an AD collector; considering the requirement of low-noise large-dynamic-range acquisition of analog voltage signals, 24-bit analog-to-digital converter ADS1255 of TI company is determined to be adopted, the ADS1255 has an effective resolution of up to 23 bits, the sampling rate is divided into 15kHz and 30kHz, the power consumption is 38mW in a working mode, the power consumption is as low as 0.4mW in a standby mode, and long-time measurement can be guaranteed. When the GPS transmits a pulse signal, the receiver starts working, and the counter starts counting; meanwhile, at the moment of turning off, a secondary magnetic field containing underground polarizer information is received by a receiving coil and converted into a voltage form; when the voltage value crosses zero, the zero-crossing comparator generates a pulse to the counter, and the counter stops counting; and calculating the time corresponding to the zero point according to the counting size. Meanwhile, the signal is converted into digital quantity readable by the singlechip after passing through the AD collector.
Referring to fig. 4, which is a schematic circuit diagram of a display module, an 12832 liquid crystal display screen with a low power consumption 128 × 32 dot matrix is controlled by pins 57-62 of a main control chip, and the main display contents are symbol inversion time, acquired data result, working/standby, and longitude and latitude and time corresponding to a GPS.
Referring to fig. 5, which is a schematic circuit diagram of a GPS synchronization module, the GPS module NEO-6 provides a high-precision pulse-per-second signal, synchronizes with a transmitter by using the falling edge of the pulse-per-second, and the data transmission rate is from 4.8 to 230KBit/s, controlled by pins 15-17 of a main control chip, and communicates with a main controller by using a universal synchronous asynchronous receiver-transmitter to obtain precise time and position information.
Referring to fig. 6, a schematic circuit diagram of the memory module is shown, a micro SD card is selected, and the card adopts an SD architecture and an SLC control technology, so that the size is small, the transmission rate is high, and the fast storage of data is ensured.
Referring to fig. 7, which is a schematic circuit diagram of the main control module and the modules, the controller selects an ARM series STM32F103RG with the highest main frequency of 72MHz, and the program architecture adopts Cortex-M3 and supports SPI, USART and I2And the C interface ensures the communication between the STM32F103RG and the micro SD card, the GPS module and the AD collector respectively.
Referring to fig. 8, a schematic diagram of a circuit of a combined power supply module is shown, a combined mode of a low dropout linear regulator module AMS1117-3.3 and a smart power supply module TPS767D301 is adopted, AMS1117-3.3 operates in a standby mode, and once a receiver is triggered to start operating, the TPS767D301 supplies power to the whole identification device
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A time domain electromagnetic weak polarization effect quick identification device is characterized by comprising:
the device comprises an actual measurement signal reading module, a zero point feature extraction module, a main control module, a display module, a synchronization module and a power supply module; wherein the content of the first and second substances,
the actual measurement signal reading module is connected with the input end of the zero point characteristic extraction module and is used for acquiring the electromagnetic response of the field actual measurement; the zero point feature extraction module is connected with the input end of the main control module; the display module is directly connected with the main control module; the synchronization module is directly connected with the main control module and the counter, adopts GPS synchronization and is used for realizing synchronization of the receiver and the transmitter and triggering the counter; the storage module is directly connected with the main control module and adopts a micro SD card; and the power supply module is used for supplying power to the whole time domain weak polarization effect quick identification device.
2. The apparatus of claim 1, wherein the measured signal reading module comprises a receiving coil and a front end differential amplifying circuit, and electromagnetic signals transmitted underground are collected by the receiving coil, converted into a voltage form, amplified by the front end differential amplifying circuit and enter the next circuit module.
3. The device of claim 1, wherein the zero point feature extraction module comprises a zero crossing comparator, a counter and an AD collector, wherein the zero crossing comparator is connected with an output end of the measured signal reading module, the high-precision LM311 is selected, the AD collector selects 24-bit ADs1255, and the counter is connected with the zero crossing comparator and is used for acquiring a symbol inversion time in a response curve; the AD acquisition circuit is connected between the output end of the actual measurement signal reading module and the main control module, and starts to sample after receiving the synchronous signal of the GPS, and converts the received voltage quantity into a digital quantity readable by the main control module; and meanwhile, the counter starts counting, when the zero-crossing comparator detects the zero-crossing point of the signal, the counter is triggered to stop counting, and the symbol inversion time is calculated according to the counting size of the counter.
4. The apparatus of claim 1, wherein the master control module comprises a master controller, the master controller selecting an STM32F103 chip.
5. The apparatus of claim 1, wherein the display module employs a 12864 display screen of 0.96 inches, which mainly displays the recognition result, the longitude and latitude of the measurement place, the altitude, and the time information.
6. The apparatus of claim 1, wherein the synchronization module is a GPS circuit of type NEO-6, and communicates with the master control module using a universal synchronous asynchronous receiver transmitter.
7. The device of claim 1, wherein the storage module is a micro SD card and communicates with the main control module by a universal serial peripheral interface.
8. The device as claimed in claim 1, wherein the power supply module adopts a mode of combining the low dropout linear regulator module AMS1117-3.3 with the intelligent power supply module TPS767D301, the low dropout linear regulator module AMS1117-3.3 operates in a standby mode, and the entire identification device is powered by the intelligent power supply module TPS767D301 upon triggering of the receiver.
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| CN110907997A (en) * | 2019-10-21 | 2020-03-24 | 吉林大学 | Rapid identification method and device for double-parameter time domain electromagnetic weak polarization effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110907997A (en) * | 2019-10-21 | 2020-03-24 | 吉林大学 | Rapid identification method and device for double-parameter time domain electromagnetic weak polarization effect |
| CN110907997B (en) * | 2019-10-21 | 2024-04-05 | 吉林大学 | Rapid identification method and device for double-parameter time domain electromagnetic weak polarization effect |
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