Broadband portable measuring system applied to rock and ore electrical parameter measurement

Abstract

The invention provides a broadband portable measuring system applied to rock and ore electrical parameter measurement, which comprises a sample frame, an execution module and a control terminal, and is characterized in that the sample frame comprises a first clamp box and a second clamp box for fixing a rock and ore sample, and a scale for measuring the length of the rock and ore sample; the scale is a connecting shaft of the first clamp box and the second clamp box; the execution module is electrically connected with the first clamp box and the second clamp box and is used for collecting response signals of the rock and ore samples through the emitted excitation signals; and the control terminal is electrically connected with the execution module, and is used for issuing a control instruction to control the execution module, receiving the collected data uploaded by the execution module, and calculating various electrical parameters of the rock and ore sample according to the collected data, thereby overcoming the defects that the existing measurement system can only support a smaller electrical impedance measurement range and a narrower frequency band measurement width; the measurement precision is low; and the measurement efficiency is low.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring electrical parameters of rock and ore, and particularly to a broadband portable measuring system applied to measuring electrical parameters of rock and ore. Background Art

[0002] In terms of mineral resource exploration, since the mineral components in rock and ore have an important influence on spectral parameters, determining the spectral parameter range of specific ore can provide strong technical reference for prospecting; in terms of environmental governance, due to the obvious physical property differences between heavy metal contaminated soil and good soil, electrical measurement of soil samples can provide effective basis for environmental detection and assessment; in terms of energy exploration, the porosity and water content of different formation rock samples will affect the electrical parameters such as conductivity and polarizability, and high-precision measurement of the electrical properties of rock samples can effectively distinguish different lithologies and underlying structures. Therefore, carrying out spectral electrical measurement of rock and ore samples has important scientific significance.

[0003] The electrical measurement instrument for rock and ore specimens is of great significance for the physical property research of rock and ore, distinguishing ore from non-ore, geophysical forward and inverse calculation and interpretation, etc. At present, many domestic and foreign enterprises and research institutions have studied this kind of instrument. Foreign enterprises have developed impedance / gain-phase analyzers, SCIP core induced polarization response measuring instruments, Solartron-1260A impedance analyzers, and spectral induced polarization response detection systems SIP-FUCHS-3, etc. Among them, Solartron-1260A has the advantages of a wide measurement frequency range and high measurement accuracy, but this instrument has problems such as being relatively bulky, poor portability, cumbersome operation steps, poor visualization, and being unable to meet the requirements of field work. Domestic research institutions have developed the time-domain induced polarization measuring system WXE for rock and ore specimens, the spectral induced polarization response tester GSZA-FW01 for rock and ore, and the mixed-frequency signal core electrical spectrum measuring instrument. Among them, GSZA-FW01 has the advantages that the measurement frequency range can reach 1 mHz - 1 kHz, the measurement range is 0.1 Ω - 0.5 GΩ, the frequency measurement resolution can reach 0.1%, the input impedance is 0.5 GΩ, and it has a high integration level. However, compared with Solartron-1260A, GSZA-FW01 still has problems such as a narrow measurement frequency range and the need to continuously optimize the impedance calibration algorithm.

[0004] When the frequency range does not exceed 1 kHz, the measurement frequency band can only reflect the basic metal physical properties of rock and ore samples, such as polarizability, phase difference, conductivity, etc., but cannot deeply reflect the induced polarization mechanism of limestone, sandstone, clay samples, etc. under energization. Therefore, in order to more deeply study or even clarify the induced polarization mechanism of different rock and ore samples to further improve the exploration accuracy, the measurement and analysis at the 1 kHz level obviously cannot meet the requirements. Therefore, it is urgent to develop a high-precision and wide-band measurement system. Summary of the Invention

[0005] The present invention provides a wide-band portable measurement system applied to the measurement of electrical parameters of rock and ore, aiming to overcome the defects of existing measurement systems, such as only supporting a small impedance measurement range, a narrow frequency band measurement width, low measurement accuracy, and low measurement efficiency.

[0006] To achieve the above object, the present invention provides a wide-band portable measurement system applied to the measurement of electrical parameters of rock and ore, including:

[0007] A sample holder, which includes a first fixture box and a second fixture box for fixing rock and ore samples, and a scale for measuring the length of the rock and ore samples. The scale is the connecting shaft of the first fixture box and the second fixture box;

[0008] An execution module, electrically connected to the first fixture box and the second fixture box, for collecting the response signals of the rock and ore samples by emitting excitation signals at different frequencies, and processing the response signals to obtain acquisition data;

[0009] A control terminal, electrically connected to the execution module, for sending control instructions to control the execution module, and also for receiving the acquisition data uploaded by the execution module and calculating various electrical parameters of the rock and ore samples according to the acquisition data.

[0010] Furthermore, the first fixture box and the second fixture box are respectively movably connected to both ends of the scale through knobs.

[0011] Furthermore, both the first fixture box and the second fixture box are hollow boxes, and a solution is injected into the boxes.

[0012] Furthermore, both the first fixture box and the second fixture box include:

[0013] A first metal electrode plate and a second metal electrode plate;

[0014] Both the first metal electrode plate and the second metal electrode plate are immersed in the injected solution;

[0015] Both the first metal electrode plate and the second metal electrode plate are electrically connected to the execution module.

[0016] Furthermore, the execution module includes:

[0017] A multi-channel synchronous acquisition board, a signal source board, and an embedded control board;

[0018] The first input end of the multi-channel synchronous acquisition board is connected to the first data transmission end of the embedded control board. The second input ends of the multi-channel synchronous acquisition board are respectively connected to the first metal electrode piece of the first fixture box, the second metal electrode piece of the first fixture box, and the first metal electrode piece of the second fixture box. The output end of the multi-channel synchronous acquisition board is connected to the positive pole of the signal source board;

[0019] The negative pole of the signal source board is connected to the second metal electrode piece of the second fixture box;

[0020] The second data transmission end of the embedded control board is connected to the data transmission end of the control terminal.

[0021] Furthermore, the multi-channel synchronous acquisition board includes:

[0022] A processing unit, a multi-channel ADC unit, a conditioning unit, a buffer unit, and a sampling resistor unit;

[0023] The first data transmission end of the processing unit is connected to the first data transmission end of the embedded control board. The second data transmission end of the processing unit is connected to the data transmission end of the multi-channel ADC unit;

[0024] The input end of the multi-channel ADC unit is connected to the output end of the conditioning unit;

[0025] The input end of the conditioning unit is connected to the output end of the buffer unit;

[0026] The first input end of the buffer unit is connected to the first metal electrode piece of the second fixture box. The second input end of the buffer unit is connected to the second metal electrode piece of the first fixture box. The third input ends of the buffer unit are respectively connected to the first metal electrode piece of the first fixture box and the first end of the sampling resistor unit. The fourth input end of the buffer unit is connected to the second end of the sampling resistor unit;

[0027] The second end of the sampling resistor unit is connected to the positive pole of the signal source board.

[0028] Furthermore, the multi-channel synchronous acquisition board further includes an electronic switch and a DAC unit;

[0029] The data transmission end of the DAC unit is connected to the third data transmission end of the processing unit. The output end of the DAC unit is connected to the input end of the electronic switch. The output end of the electronic switch is connected to all the input ends of the buffer unit.

[0030] Furthermore, the conditioning unit includes:

[0031] The first multi-stage amplifier circuit, the second multi-stage amplifier circuit, the third multi-stage amplifier circuit, the fourth multi-stage amplifier circuit;

[0032] The first anti-aliasing filter, the second anti-aliasing filter, the third anti-aliasing filter, the fourth anti-aliasing filter;

[0033] The input ends of the first multi-stage amplifier circuit, the second multi-stage amplifier circuit, the third multi-stage amplifier circuit, and the fourth multi-stage amplifier circuit are all connected to the output end of the buffer unit;

[0034] The output end of the first multi-stage amplifier circuit is connected to the input end of the first anti-aliasing filter;

[0035] The output end of the second multi-stage amplifier circuit is connected to the input end of the second anti-aliasing filter;

[0036] The output end of the third multi-stage amplifier circuit is connected to the input end of the third anti-aliasing filter;

[0037] The output end of the fourth multi-stage amplifier circuit is connected to the input end of the fourth anti-aliasing filter;

[0038] The output ends of the first anti-aliasing filter, the second anti-aliasing filter, the third anti-aliasing filter, and the fourth anti-aliasing filter are all connected to the input end of the multi-channel ADC unit.

[0039] Furthermore, the conditioning unit further includes:

[0040] The first single-ended to differential circuit, the second single-ended to differential circuit, the third single-ended to differential circuit, the fourth single-ended to differential circuit;

[0041] The input end of the first single-ended to differential circuit is connected to the output end of the first multi-stage amplifier circuit, and the output end of the first single-ended to differential circuit is connected to the input end of the first anti-aliasing filter;

[0042] The input end of the second single-ended to differential circuit is connected to the output end of the second multi-stage amplifier circuit, and the output end of the second single-ended to differential circuit is connected to the input end of the second anti-aliasing filter;

[0043] The input end of the third single-ended to differential circuit is connected to the output end of the third multi-stage amplifier circuit, and the output end of the third single-ended to differential circuit is connected to the input end of the third anti-aliasing filter;

[0044] The input end of the fourth single-ended to differential circuit is connected to the output end of the fourth multi-stage amplifier circuit, and the output end of the fourth single-ended to differential circuit is connected to the input end of the fourth anti-aliasing filter.

[0045] Furthermore, calculate various electrical parameters of the rock and ore samples according to the collected data, including:

[0046] After taking the difference of the voltage data sequences at both ends of the rock and ore sample in the acquired data and performing Fourier transform, a first complex number sequence is obtained. According to the sampling rate of the execution module, the first complex number sequence is put into one-to-one correspondence with the frequency point sequence, and the complex values corresponding to each frequency point in the frequency point sequence are extracted to obtain the complex voltage at both ends of the rock and ore sample at each frequency point;

[0047] After taking the difference of the voltage data sequences at both ends of the sampling resistance unit in the acquired data and performing Fourier transform, a second complex number sequence is obtained. According to the sampling rate of the execution module, the second complex number sequence is put into one-to-one correspondence with the frequency point sequence, and the complex values corresponding to each frequency point in the frequency point sequence are extracted to obtain the complex voltage at both ends of the sampling resistance unit at each frequency point;

[0048] Calculate the complex impedance of the rock and ore sample according to the complex voltage at both ends of the rock and ore sample, the complex voltage at both ends of the sampling resistance unit, and the resistance value of the sampling resistance unit. The calculation expression is:

[0049]

[0050] Among them, R x represents the complex impedance of the rock and ore sample, f represents the frequency point, U AB represents the complex voltage at both ends of the rock and ore sample, U MN represents the complex voltage at both ends of the sampling resistance unit, R s represents the resistance value of the sampling resistance unit;

[0051] Calculate the resistivity of the rock and ore sample according to the complex impedance of the rock and ore sample, the cross-sectional area of the rock and ore sample, and the length of the rock and ore sample. The calculation expression is:

[0052]

[0053] Among them, ρ represents the resistivity of the rock and ore sample, s represents the cross-sectional area of the rock and ore sample, l represents the length of the rock and ore sample, ||R x (f)|| represents taking the modulus of the complex impedance R x (f) of the rock and ore sample at the frequency point f;

[0054] Calculate the phase and polarizability of the rock and ore sample according to the complex impedance of the rock and ore sample. Among them,

[0055] The calculation expression for the phase is:

[0056]

[0057] In the formula, represents the phase of the rock and ore sample, Im(R x (f)) represents the imaginary part of the complex impedance of the rock and ore sample, Real(R x(f)) represents the real part of the complex impedance of the rock and ore sample, and atan2(·) is used to calculate the angular value according to the quadrant or coordinate axis where the complex impedance of the rock and ore sample is located;

[0058] The calculation expression of the polarizability is:

[0059]

[0060] In the formula, η represents the polarizability of the rock and ore sample, f0 represents the low-frequency point, and f1 represents the high-frequency point.

[0061] The above solution of the present invention has the following beneficial effects:

[0062] The broadband portable measurement system provided by the present invention includes a sample holder, an execution module, and a control terminal. Among them, the sample holder includes a first fixture box and a second fixture box for fixing the rock and ore sample, and a scale for measuring the length of the rock and ore sample. The scale is the connecting shaft of the first fixture box and the second fixture box; the execution module is electrically connected to the first fixture box and the second fixture box, and is used to collect the response signal of the rock and ore sample by transmitting excitation signals at different frequency points, and process the response signal to obtain the collected data; the control terminal is electrically connected to the execution module, and is used to issue control instructions to control the execution module, and is also used to receive the collected data uploaded by the execution module, and calculate various electrical parameters of the rock and ore sample according to the collected data; compared with the existing measurement system, the control part and the execution part of the present invention are designed separately, making the measurement system more portable, the operation efficiency more efficient, and the user experience more friendly; by transmitting excitation signals at different frequency points from the execution module to the sample holder to collect data and upload it to the control terminal in real time, the frequency of the excitation signal can reach the MHz level, so broadband measurement of the rock and ore sample can be carried out, which can effectively improve the measurement accuracy. Using the control terminal to calculate various electrical parameters of the rock and ore sample makes the obtained electrical parameters richer, and can reflect the conductivity, space, structure and other information of the sample in multiple dimensions, overcoming the defects of the existing measurement system that can only support a small impedance measurement range, a narrow frequency band measurement width, low measurement accuracy and low measurement efficiency, making the detection accuracy higher.

[0063] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention;

[0065] Figure 2 is the structural schematic diagram of the embedded control board in the embodiment of the present invention;

[0066] Figure 3 is the structural schematic diagram of the multi-channel synchronous acquisition board in the embodiment of the present invention;

[0067] Figure 4 This is a schematic structural diagram of the processing unit in the embodiment of the present invention.

[0068] Reference numerals:

[0069] 1 - sample rack, 2 - first fixture box, 3 - second fixture box, 4 - scale

[0070] 5 - rock and ore sample, 6 - execution module, 7 - control terminal. Detailed implementation manners

[0071] To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0072] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a locking connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0074] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0075] The present invention provides a broadband portable measurement system applied to the measurement of electrical parameters of rock and ore in view of existing problems.

[0076] Such as Figure 1As shown in the figure, an embodiment of the present invention provides a broadband portable measurement system for measuring the electrical parameters of rock and ore, including:

[0077] A sample holder 1, which includes a first fixture box 2 and a second fixture box 3 for fixing a rock and ore sample 5, and a scale 4 for measuring the length of the rock and ore sample 5. The scale 4 is the connecting shaft of the first fixture box 2 and the second fixture box 3;

[0078] An execution module 6, which is electrically connected to the first fixture box 2 and the second fixture box 3, and is used for collecting the response signals of the rock and ore sample 5 by emitting excitation signals of different frequencies, and processing the response signals to obtain acquisition data;

[0079] A control terminal 7, which is electrically connected to the execution module 6, is used for issuing control instructions to control the execution module 6, and is also used for receiving the acquisition data uploaded by the execution module 6, and calculating various electrical parameters of the rock and ore sample 5 according to the acquisition data.

[0080] In the embodiment of the present invention, the sample holder 1 is the carrier of the rock and ore sample 5, and the rock and ore sample 5 can be fixed on the sample holder 1 by mechanical screwing to reduce the contact impedance; the execution module 6 is the specific execution structure of the broadband portable measurement system, and under the control of the control terminal 7, it completes the output of the excitation signal, the acquisition of the response signal of the rock and ore sample 5, and the upload after signal processing. The execution module 6 is electrically connected to the first fixture box 2 and the second fixture box 3 of the sample holder 1 through multiple shielded cables and establishes communication with the control terminal 7; the control terminal 7 is the control core of the broadband portable measurement system, and all control commands are issued by the control terminal 7. The running steps of the execution module 6 are completed under the control of the control terminal 7. In addition, the control terminal 7 also needs to receive the acquisition data uploaded by the execution module 6, then calculate various electrical parameters at different frequencies based on these acquisition data, and visualize the calculation results.

[0081] Specifically, the first fixture box 2 and the second fixture box 3 are respectively movably connected to both ends of the scale 4 through knobs.

[0082] It should be noted that there are precise scales on the scale 4. When the first fixture box 2 and the second fixture box 3 fix the rock and ore sample 5 in the middle, the scale 4 can complete the measurement of the length of the rock and ore sample 5, and can also reduce the contact impedance while increasing the coupling strength.

[0083] Specifically, both the first fixture box 2 and the second fixture box 3 are hollow boxes, and a solution is injected into the boxes.

[0084] It should be noted that the solution injected into the first fixture box 2 and the second fixture box 3 is a conductive solution, which can be sodium chloride solution, potassium chloride solution, sodium sulfate solution, sodium hydroxide solution, potassium nitrate solution, etc. The most suitable conductive solution can be selected according to cost constraints.

[0085] Specifically, both the first fixture box 2 and the second fixture box 3 include:

[0086] A first metal electrode plate and a second metal electrode plate;

[0087] Both the first metal electrode plate and the second metal electrode plate are immersed in the injected solution;

[0088] Both the first metal electrode plate and the second metal electrode plate are electrically connected to the execution module 6.

[0089] It should be noted that both the first metal electrode plate and the second metal electrode plate are electrically connected to the execution module 6 through shielded cables.

[0090] Specifically, the execution module 6 includes:

[0091] A multi-channel synchronous acquisition board for parsing, executing, and distributing received control commands and processing collected response signals, a signal source board for generating excitation signals with different frequencies, amplitudes, and working modes under the control of the multi-channel synchronous acquisition board, and an embedded control board for bridging the multi-channel synchronous acquisition board and the control terminal 7;

[0092] The first input end of the multi-channel synchronous acquisition board is connected to the first data transmission end of the embedded control board. The second input ends of the multi-channel synchronous acquisition board are respectively connected to the first metal electrode plate of the first fixture box 2, the second metal electrode plate of the first fixture box 2, and the first metal electrode plate of the second fixture box 3. The output end of the multi-channel synchronous acquisition board is connected to the positive pole of the signal source board;

[0093] The negative pole of the signal source board is connected to the second metal electrode plate of the second fixture box 3;

[0094] The second data transmission end of the embedded control board is connected to the data transmission end of the control terminal 7.

[0095] In an embodiment of the present invention, the signal source board supports two working modes, constant voltage and constant voltage, and can output various types of waveforms, mainly including sine waves, square waves, pseudo-random waves, and triangular waves, etc. The frequency of the excitation signal output by the signal source board can reach up to the MHz level at most, and it can perform broadband measurement on rock and ore samples; the embedded control board, on the one hand, receives the control commands sent by the control terminal 7, parses, executes, and distributes the control commands, and on the other hand, receives the acquisition data uploaded by the multi-channel synchronous acquisition board, copies the acquisition data, writes one copy into the memory for local storage, and uploads one copy to the control terminal 7. The control terminal 7 has different frame header addresses for different circuit board control commands, and the control command distribution is to send the control commands to different circuit boards according to the frame header addresses, and the circuit boards execute corresponding steps according to specific commands.

[0096] It should be noted that the embedded control board can exist independently, or the functional modules of the embedded control board can be integrated into the multi-channel synchronous acquisition board, and there is no need to set up an independent embedded control board.

[0097] Specifically, as Figure 2 shown, the multi-channel synchronous acquisition board includes:

[0098] A sampling resistor unit, a buffer unit for buffering the response signals transmitted by the sample holder 1 and the sampling resistor unit, a conditioning unit for conditioning the signals after buffering, a multi-channel ADC unit for performing analog-to-digital conversion on the conditioned signals, and a processing unit for parsing, distributing, and executing the control commands issued by the embedded control board, controlling the multi-channel ADC unit to perform synchronous parallel acquisition, and sending the processed acquisition data to the embedded control board, and controlling the signal source board to generate excitation signals with different frequencies, different amplitudes, and different working modes;

[0099] The first data transmission end of the processing unit is connected to the first data transmission end of the embedded control board, and the second data transmission end of the processing unit is connected to the data transmission end of the multi-channel ADC unit;

[0100] The input end of the multi-channel ADC unit is connected to the output end of the conditioning unit;

[0101] The input end of the conditioning unit is connected to the output end of the buffer unit;

[0102] The first input end of the buffer unit is connected to the first metal electrode sheet of the second fixture box 3, the second input end of the buffer unit is connected to the second metal electrode sheet of the first fixture box 2, the third input end of the buffer unit is respectively connected to the first metal electrode sheet of the first fixture box 2 and the first end of the sampling resistor unit, and the fourth input end of the buffer unit is connected to the second end of the sampling resistor unit;

[0103] The second end of the sampling resistor unit is connected to the positive pole of the signal source board.

[0104] In the embodiment of the present invention, the sampling resistor unit is a sampling resistor network composed of multiple parallel sampling branches. Each sampling branch is composed of a signal relay and a sampling resistor in series. The resistance values of the sampling resistors are all known and of high precision. When the impedance of the rock and ore sample is large, a sampling resistor with a large resistance value is used for measurement. When the impedance of the rock and ore sample is small, a sampling resistor with a small resistance value is used for measurement. This method of changing the sampling resistor can effectively improve the measurement accuracy; the buffer unit is designed with an integrated operational amplifier, and the integrated operational amplifier is designed in the form of voltage following for signal input and output. This design can, on the one hand, greatly increase the input impedance of the acquisition channel, and on the other hand, can perform simple filtering on the input response signal.

[0105] In the embodiment of the present invention, the matching step of the sampling resistor is as follows:

[0106] One of the signal relays in the sampling branch will be default closed, and the corresponding sampling resistor will be connected in series to the measurement circuit;

[0107] Pre-acquisition of the rock and ore sample is completed under a lower-frequency excitation signal;

[0108] Calculate the impedance of the rock and ore sample according to the result of the pre-acquisition, select a sampling resistor with an impedance similar to that of the rock and ore sample in the sampling resistor unit, and connect the sampling resistor in series to the measurement circuit.

[0109] It should be noted that in the embodiment of the present invention, the sampling rate of the multi-channel ADC unit changes with the change of the excitation frequency. The process of selecting the sampling rate of the multi-channel ADC unit includes:

[0110] First, multiply the frequency f of the excitation signal by a constant integer n to obtain a value nf;

[0111] Compare the value nf with the sampling rate sequence supported by the multi-channel ADC unit, and select the sampling rate closest to the value nf as the sampling rate of the multi-channel ADC unit for data acquisition. The constant integer n is at least greater than or equal to 4;

[0112] Since the sampling rate sequence supported by the multi-channel ADC unit is limited and has a maximum value and a minimum value, when the value nf is greater than the maximum value of the sampling rate of the multi-channel ADC unit, the sampling rate of the multi-channel ADC unit is configured as the maximum value. When the value nf is less than the minimum value of the sampling rate of the multi-channel ADC unit, the sampling rate of the multi-channel ADC unit is configured as the minimum value.

[0113] Most preferably, the multi-channel synchronous acquisition board further includes an electronic switch for controlling the conduction and disconnection of the buffer unit and a DAC unit for generating a voltage signal for self-checking;

[0114] The data transmission end of the DAC unit is connected to the third data transmission end of the processing unit, the output end of the DAC unit is connected to the input end of the electronic switch, and the output end of the electronic switch is connected to all the input ends of the buffer unit.

[0115] Specifically, as Figure 3 shown, the conditioning unit includes:

[0116] A first multi-stage amplification circuit, a second multi-stage amplification circuit, a third multi-stage amplification circuit, and a fourth multi-stage amplification circuit for amplifying the buffered signal by different multiples;

[0117] A first anti-aliasing filter, a second anti-aliasing filter, a third anti-aliasing filter, and a fourth anti-aliasing filter for filtering out noise signals with frequencies greater than 1 / 2 times the sampling rate in the amplified signal;

[0118] The input ends of the first multi-stage amplification circuit, the second multi-stage amplification circuit, the third multi-stage amplification circuit, and the fourth multi-stage amplification circuit are all connected to the output end of the buffer unit;

[0119] The output end of the first multi-stage amplification circuit is connected to the input end of the first anti-aliasing filter;

[0120] The output end of the second multi-stage amplification circuit is connected to the input end of the second anti-aliasing filter;

[0121] The output end of the third multi-stage amplification circuit is connected to the input end of the third anti-aliasing filter;

[0122] The output end of the fourth multi-stage amplification circuit is connected to the input end of the fourth anti-aliasing filter;

[0123] The output ends of the first anti-aliasing filter, the second anti-aliasing filter, the third anti-aliasing filter, and the fourth anti-aliasing filter are all connected to the input end of the multi-channel ADC unit.

[0124] In the embodiment of the present invention, the first multi-stage amplification circuit, the second multi-stage amplification circuit, the third multi-stage amplification circuit, and the fourth multi-stage amplification circuit all use integrated operational amplifiers for the basic amplification circuit design, and then the basic amplification circuits are connected in series to form the first multi-stage amplification circuit, the second multi-stage amplification circuit, the third multi-stage amplification circuit, and the fourth multi-stage amplification circuit.

[0125] Most preferably, the conditioning unit further includes:

[0126] The first single-ended to differential circuit, the second single-ended to differential circuit, the third single-ended to differential circuit, and the fourth single-ended to differential circuit for converting the amplified signal into a differential signal;

[0127] The input end of the first single-ended to differential circuit is connected to the output end of the first multi-stage amplifier circuit, and the output end of the first single-ended to differential circuit is connected to the input end of the first anti-aliasing filter;

[0128] The input end of the second single-ended to differential circuit is connected to the output end of the second multi-stage amplifier circuit, and the output end of the second single-ended to differential circuit is connected to the input end of the second anti-aliasing filter;

[0129] The input end of the third single-ended to differential circuit is connected to the output end of the third multi-stage amplifier circuit, and the output end of the third single-ended to differential circuit is connected to the input end of the third anti-aliasing filter;

[0130] The input end of the fourth single-ended to differential circuit is connected to the output end of the fourth multi-stage amplifier circuit, and the output end of the fourth single-ended to differential circuit is connected to the input end of the fourth anti-aliasing filter.

[0131] It should be noted that the first single-ended to differential circuit, the second single-ended to differential circuit, the third single-ended to differential circuit, and the fourth single-ended to differential circuit in the embodiments of the present invention are set according to the type of the multi-channel ADC unit. When the multi-channel ADC unit is of the single-ended acquisition type, there is no need to set the first single-ended to differential circuit, the second single-ended to differential circuit, the third single-ended to differential circuit, and the fourth single-ended to differential circuit. When the multi-channel ADC unit is of the differential acquisition type, it is necessary to set the first single-ended to differential circuit, the second single-ended to differential circuit, the third single-ended to differential circuit, and the fourth single-ended to differential circuit.

[0132] Specifically, as Figure 4 shown, the processing unit includes:

[0133] A data receiving sub-unit that receives the control command sent by the embedded control board through a digital communication protocol. The digital communication protocol used in this sub-unit can be one of the UART serial port protocol, the SPI bus protocol, and the IIC bus protocol;

[0134] A kernel sub-unit, which is the control core of the processing unit, is used to receive the control command output by the data receiving unit, and parse, execute, and distribute the control command;

[0135] The acquisition control sub-unit is used to receive the control commands output by the kernel unit, and complete the configuration of the multi-channel ADC unit and the setting of the amplification factor of each multi-stage amplification circuit according to the control commands; read the digital signals output by the multi-channel ADC unit and output them to the kernel sub-unit for processing. The configuration of the multi-channel ADC unit includes the configuration of the sampling rate, the synchronous mode, etc. Moreover, the lower the frequency of the excitation signal, the lower the sampling rate of the multi-channel ADC unit needs to be configured.

[0136] The decimation filter sub-unit includes 4 decimation filter circuits with the same functions and structures in parallel. Each decimation filter circuit is composed of a multi-stage CIC decimation filter and a multi-stage FIR filter. The 4 decimation filter circuits respectively perform synchronous decimation filtering processing on the acquisition data output by the kernel sub-unit.

[0137] The FIFO buffer sub-unit includes 4 FIFO buffers in parallel and 1 FIFO controller. The 4 FIFO buffers synchronously buffer the data output by the kernel sub-unit or the decimation filter sub-unit under the control of the FIFO controller.

[0138] The data sending sub-unit reads the data output by the FIFO buffer sub-unit in parallel, completes the parallel-to-serial operation, and then uploads the converted serial data to the embedded control board through the digital communication protocol.

[0139] The DDS control sub-unit, after receiving the control commands sent by the kernel sub-unit, parses and packages the control commands, and then issues them to the signal source board to complete the control of the frequency, amplitude, and working mode of the excitation signal.

[0140] It should be noted that the decimation filter sub-unit is generally in an idle state. Only when the sampling rate of the multi-channel ADC unit is configured to the minimum value, and the ratio of the sampling rate of the multi-channel ADC unit to the excitation signal frequency is greater than or equal to a certain constant integer m, the kernel sub-unit outputs the acquisition data to the decimation filter sub-unit, and the decimation filter sub-unit is started; the constant integer m can be set manually, generally greater than the constant integer n; the decimation rates of the multi-stage CIC decimation filter and the multi-stage FIR filter are not fixed, but are freely combined according to the size range of the constant integer m to complete the adaptive setting of the decimation rate.

[0141] Specifically, the embedded control board includes:

[0142] The wireless transmission module includes two parts: a Bluetooth unit and a WiFi unit. The Bluetooth unit is used to receive control commands with a small amount of data and low speed sent by the control terminal 7. The WiFi unit is used to send the large-capacity and high-speed acquisition data uploaded by the multi-channel synchronous acquisition board to the control terminal 7. This communication method of separating configuration commands and sending data can effectively improve the communication stability of the entire system. When the Bluetooth unit receives the control command sent by the control terminal 7, it sends the command to the STM32 processor for processing;

[0143] The ROM memory is used to locally store the acquisition data;

[0144] The RAM memory is used to temporarily cache the acquisition data;

[0145] The STM32 processor is the control core of the embedded control board. It is used to control the Bluetooth unit to receive the control commands sent by the control terminal 7, and parse, execute, and distribute the control commands; receive the acquisition data uploaded by the multi-channel synchronous acquisition board, and write the acquisition data into the RAM memory for caching; read the data cached in the RAM memory, and perform processing such as packing the acquisition data and adding frame headers and trailers. Then, on the one hand, store the processed acquisition data in the ROM memory for local storage, and on the other hand, control the WiFi unit to upload the processed acquisition data to the control terminal 7.

[0146] Specifically, the control terminal 7 includes a working parameter setting area, an acquisition data monitoring area, a calculation result display area, a calculation result analysis area, an execution module 6 start / stop area, and a historical rock and ore sample measurement result list area. Among them, the functions of each area are as follows:

[0147] The working parameter setting area is used to set the working parameters of the execution module 6 and the attribute parameters of the sample to be measured. The working parameter setting of the execution module 6 includes setting the constant voltage or constant current working mode, the amplitude setting of the excitation signal, the bandwidth setting, the number of frequency points setting, the number of measurement times for each frequency point setting, and the error threshold setting. The attribute parameter setting of the sample to be measured includes inputting the name of the rock and ore sample, the sample number, the work area, automatic update of longitude and latitude, and taking pictures of the sample for recording;

[0148] The acquisition data monitoring area is used to generate a curve graph for the latest received acquisition data. Specifically, a curve is generated for the data of multiple acquisition channels. The horizontal axis is the point number of the data, and the vertical axis is the amplitude of the data. When new acquisition data is received, a curve graph is generated with the new acquisition data and automatically covers the previous curve graph. The curve corresponding to each acquisition channel in this area can be displayed and hidden by checking, so as to facilitate viewing the curves of each channel;

[0149] The calculation result display area is used to plot the resistivity and phase of the rock and ore samples calculated at different frequency points of the excitation signal. The horizontal axis is the frequency point value in logarithmic coordinate form, and the vertical axis is in linear dual coordinate form, with resistivity on one side and phase on the other. After calculating the resistivity and phase of the rock and ore samples at each frequency point of the excitation signal, they are displayed in this area until the resistivity and phase corresponding to all frequency points are calculated and displayed;

[0150] The calculation result analysis area is used to display the current preset values and specific calculation parameters. The preset values mainly include the frequency point value, constant voltage or constant current mode, and the specific calculation parameters mainly include resistivity, phase, resistivity error threshold, phase error threshold, amplitude of each acquisition channel, and polarizability;

[0151] The start-stop area is used to control the automatic frequency sweep measurement and stop of the execution module 6, etc.;

[0152] The historical measurement result list area of rock and ore samples is used to store the resistivity, phase, and polarizability parameters of the rock and ore samples that have completed measurement, as well as the resistivity and phase curve graphs corresponding to different frequency points of the excitation signal.

[0153] Most preferably, various electrical parameters of the rock and ore samples are calculated based on the acquired data, including:

[0154] The voltage data sequence at both ends of the rock and ore sample in the acquired data is differentiated and then Fourier-transformed to obtain the first complex sequence. According to the sampling rate of the execution module, the first complex sequence is put into one-to-one correspondence with the frequency point sequence, and the complex values corresponding to each frequency point in the frequency point sequence are extracted to obtain the complex voltage at both ends of the rock and ore sample at each frequency point;

[0155] The voltage data sequence at both ends of the sampling resistance unit in the acquired data is differentiated and then Fourier-transformed to obtain the second complex sequence. According to the sampling rate of the execution module, the second complex sequence is put into one-to-one correspondence with the frequency point sequence, and the complex values corresponding to each frequency point in the frequency point sequence are extracted to obtain the complex voltage at both ends of the sampling resistance unit at each frequency point;

[0156] The complex impedance of the rock and ore sample is calculated based on the complex voltage at both ends of the rock and ore sample, the complex voltage at both ends of the sampling resistance unit, and the resistance value of the sampling resistance unit. The calculation expression is:

[0157]

[0158] where, R x represents the complex impedance of the rock and ore sample, f represents the frequency point, U AB represents the complex voltage at both ends of the rock and ore sample, U MN represents the complex voltage at both ends of the sampling resistance unit, R s represents the resistance value of the sampling resistance unit;

[0159] Calculate the resistivity of the rock and ore sample based on the complex impedance of the rock and ore sample, the cross-sectional area of the rock and ore sample, and the length of the rock and ore sample. The calculation expression is as follows:

[0160]

[0161] Among them, ρ represents the resistivity of the rock and ore sample, s represents the cross-sectional area of the rock and ore sample, l represents the length of the rock and ore sample, ||R x (f)|| represents taking the modulus of the complex impedance R x (f) of the rock and ore sample at the frequency point f;

[0162] Calculate the phase and polarizability of the rock and ore sample based on the complex impedance of the rock and ore sample. Among them,

[0163] The calculation expression for the phase is as follows:

[0164]

[0165] In the formula, represents the phase of the rock and ore sample, Im(R x (f)) represents the imaginary part of the complex impedance of the rock and ore sample, Real(R x (f)) represents the real part of the complex impedance of the rock and ore sample, and atan2(·) is used to calculate the angle value according to the quadrant or coordinate axis where the complex impedance of the rock and ore sample is located, and the value range is (-π, π];

[0166] The calculation expression for the polarizability is as follows:

[0167]

[0168] In the formula, η represents the polarizability of the rock and ore sample, f0 represents the low-frequency point, f1 represents the high-frequency point, where f0 < f1, and f0 and f1 are both artificially defined frequency points.

[0169] In an embodiment of the present invention, a 4-channel synchronous acquisition board is taken as an example to specifically illustrate the working process of the broadband portable measurement system. The working process includes:

[0170] Step 1: Fix the rock and ore sample on the sample rack. The sample rack is connected to the execution module through 4 shielded cables, and power on is started;

[0171] Step 2, initialize the execution module and the control terminal; the initialization of the execution module is to reset some pins on the embedded control board, 4-channel synchronous acquisition board, and signal source board, and then configure a default sampling resistor. The initialization of the control terminal is to configure some parameters in the control terminal, start some processes in the background, and then complete the Wifi connection and Bluetooth pairing between the execution module and the control terminal;

[0172] Step 3, the control terminal completes the settings; the settings of the control terminal are used to set the working parameters of the execution module and the attribute parameters of the sample to be measured. The working parameters of the execution module include the setting of the constant voltage or constant current working mode, the setting of the excitation signal amplitude, the setting of the bandwidth, the setting of the number of sampling resistor frequency points, the setting of the number of measurements at each frequency point, and the setting of the error threshold, etc. The attribute parameters of the sample to be measured include the input of the name of the rock and ore sample, the input of the sample number, the input of the work area, the automatic update of the longitude and latitude, and the sample photo recording, etc. The working parameters of the execution module need to be packaged and then sent to the execution module, while the attribute parameters of the sample to be measured are used for sample marking and do not need to be sent to the execution module;

[0173] Step 4, the embedded board determines whether the control terminal has sent a control command; if the control terminal has sent a control command, go to Step 5; if not, continue to wait;

[0174] Step 5, the embedded control board analyzes the control command sent by the control terminal; analyzing the control command is to parse the meaning of the control command by referring to the pre-set protocol;

[0175] Step 6, the embedded board determines whether the control command is to read the collected data backed up in the ROM; if it is, go to Step 8; if not, indicating that the control command is sent to the 4-channel synchronous acquisition board, go to Step 7;

[0176] Step 7, the embedded board converts the parsed command into a pre-set binary protocol and then sends it to the acquisition board; after sending is completed, go to Step 9;

[0177] Step 8, the STM32 processor in the embedded board reads the collected data stored in the ROM and then uploads it to the control terminal; the data stored in the ROM is historical collected data, and the control terminal reads the collected data in the ROM to view the historical data; after reading is completed, go to Step 25;

[0178] Step 9, the FPGA processor in the 4-channel synchronous acquisition board analyzes the command data sent by the embedded board; analyzing the command data is also to parse the binary meaning of the command data by referring to the pre-set protocol; after parsing is completed, go to Step 10;

[0179] Step 10, the FPGA processor determines whether the received command is an adaptive calculation sampling resistance command; before normal measurement and calculation, it is first necessary to configure a sampling resistance similar to the impedance of the sample to be measured; after the configuration is completed, the normal measurement and calculation process can be entered; if the received command is an adaptive calculation sampling resistance command, go to Step 11; if not, go to Step 15;

[0180] Step 11, the acquisition board configures the signal source board to output a specific excitation signal; here, the specific excitation signal generally means that according to the program preset by the control terminal, the excitation signal is configured as a low-frequency, large-amplitude, and constant-voltage mode to avoid the influence of parasitic capacitance in the circuit, so as to accurately calculate the impedance of the sample to be measured;

[0181] Step 12, the FPGA processor configures the sampling rate, amplification factor, and whether to start the decimation filtering function of the acquisition board, etc.; the configuration parameters here are also specific. Generally, according to the program preset by the control terminal, the sampling rate of the ADC is configured to be the lowest, the amplification factor of the acquisition channel is set to 1, that is, no amplification, and the decimation filtering function is not started; configuring the acquisition board in this way can accurately collect the response signals at both ends of the sample to be measured and the sampling resistance, so as to accurately calculate the impedance of the sample to be measured;

[0182] Step 13, the acquisition board executes the pre-acquisition command; the pre-acquisition is similar to the normal acquisition command, both are to control the acquisition board to collect the response data at both ends of the sample to be measured and the sampling resistance; but the normal acquisition command calculates the resistivity and phase of the sample to be measured based on the collected data; while the pre-acquisition is to first calculate the impedance of the sample through the default sampling resistance, and then select a resistor with a resistance value close to the impedance of the sample as the sampling resistance;

[0183] Step 14, the FPGA processor in the acquisition board determines whether the falling edge of DRDY_n is detected; the falling edge signal of the DRDY_n pin indicates that the 4-channel ADC has collected data; otherwise, the data has not been collected yet; if the falling edge of DRDY_n is detected, go to Step 20; otherwise, continue to wait;

[0184] Step 15, the FPGA processor in the acquisition board determines whether the received command is a set sampling resistance command; if so, go to Step 16; otherwise, go to Step 17;

[0185] Step 16, set the sampling resistance according to the received command; setting the sampling resistance means that the FPGA processor closes the corresponding signal relay according to the received command, so as to connect the corresponding sampling resistance in series with the sample to be measured; after the setting is completed, go to Step 30;

[0186] Step 17: The FPGA processor configures the signal source board according to the command data. Specifically, it configures the frequency, amplitude, and working mode of the excitation signal output by the signal source, and outputs the excitation signal.

[0187] Step 18: The FPGA processor configures the acquisition board according to the command data. Specifically, it configures the sampling rate of the ADC, the amplification factor of the acquisition channels, and the synchronous acquisition mode of the 4 ADCs, etc.

[0188] Step 19: The acquisition board executes the acquisition command. Here, the acquisition is normal acquisition, that is, at a certain frequency point of the excitation signal, the response signals at both ends of the sample under test and the sampling resistor are acquired. After this step is completed, go to Step 14.

[0189] Step 20: The FPGA processor reads the data output by the 4 ADCs according to the digital communication protocol.

[0190] Step 21: The core unit of the FPGA determines whether to perform decimation filtering on the acquired data according to the received command. If decimation filtering is to be performed, go to Step 22; otherwise, go to Step 23.

[0191] Step 22: The FPGA processor performs decimation filtering on the acquired data at a certain decimation rate by calling and combining a CIC decimation filter and an FIR filter.

[0192] Step 23: The FPGA processor uploads the acquired data to the embedded board through the digital communication protocol.

[0193] Step 24: The embedded board uploads the acquired data to the control terminal through the Wifi protocol.

[0194] Step 25: After the control terminal finishes receiving the acquired data, it generates graphs for the data of each of the 4 channels.

[0195] Step 26: The control terminal calculates the resistance, resistivity, and phase of the sample under test at the current excitation signal frequency point according to the received acquired data.

[0196] Step 27: The control terminal determines whether to set the sampling resistor. When calculating the sampling resistor, the execution module also needs to acquire the response signals at both ends of the sample under test and the sampling resistor, and upload the acquired data to the control terminal. To distinguish from normal acquisition, the control terminal needs to further judge the current command. If it is to set the sampling resistor, go to Step 30; otherwise, go to Step 28.

[0197] Step 28, the control terminal determines whether the resistivity and phase of the sample to be measured at the last frequency point are completed; the number of frequency points measured by the measurement system in each round is set by the control terminal. After calculating the resistivity and phase at each frequency point, the control terminal needs to determine whether it is the last frequency point to prevent measurement errors; if it is the calculation of the last frequency point, go to Step 29; otherwise, go to Step 30;

[0198] Step 29, the control terminal calculates the polarizability of the sample to be measured based on the calculated results; when the resistivity and phase corresponding to all frequency points are calculated, the control terminal will further calculate the polarizability of the sample to be measured according to the resistivity values of the high and low frequency points; after the calculation is completed, go to Step 31;

[0199] Step 30, the return here is not to Step 2, but to Step 4; the control terminal cannot complete the configuration of the sampling resistor and the calculation of the resistivity and phase of all frequency points with one control command, but needs to send control commands automatically multiple times to complete a complete measurement task; when the matching sampling resistor is calculated, it needs to return to Step 4, and at this time the control terminal automatically sends a command to complete the setting of the sampling resistor; when the resistivity and phase at a certain excitation frequency point are calculated, it also needs to return to Step 4, and at this time the control terminal automatically sends a command to start the measurement and calculation of the next frequency point;

[0200] Step 31, the stop here is the entrance to Step 3; when a complete round of measurement ends, the measurement system will enter the entrance to Step 3 and wait to reset the parameters to start the next round of measurement; in addition, the response level of the stop button in the control terminal is the highest. No matter which step the measurement system is in during the measurement, when the operator clicks the stop button, the control terminal will stop immediately and enter the entrance to Step 3.

[0201] The broadband portable measurement system provided by the embodiment of the present invention includes a sample holder, an execution module, and a control terminal. Among them, the sample holder includes a first fixture box and a second fixture box for fixing rock and ore samples, and a scale for measuring the length of the rock and ore samples. The scale is the connecting shaft of the first fixture box and the second fixture box; the execution module is electrically connected to the first fixture box and the second fixture box, and is used for collecting the response signals of the rock and ore samples by emitting excitation signals of different frequency points, and processing the response signals to obtain the collected data; the control terminal is electrically connected to the execution module, and is used for sending control instructions to control the execution module, and is also used for receiving the collected data uploaded by the execution module, and calculating various electrical parameters of the rock and ore samples according to the collected data; compared with the existing measurement system, the control part and the execution part of the embodiment of the present invention are designed separately, making the measurement system more portable, the operation efficiency more efficient, and the user experience more friendly; by the execution module emitting excitation signals at different frequency points to the sample holder to collect data and upload it to the control terminal in real time, the frequency of the excitation signal can reach the MHz level, so wide-band measurement can be performed on the rock and ore samples, which can effectively improve the measurement accuracy. Using the control terminal to calculate various electrical parameters of the rock and ore samples makes the obtained electrical parameters richer, and can reflect the information such as the conductivity, space, and structure of the sample in multiple dimensions, overcoming the defects of the existing measurement system that can only support a small impedance measurement range, a narrow frequency band measurement width, low measurement accuracy, and low measurement efficiency, making the detection accuracy higher.

[0202] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A broadband portable measurement system applied to the measurement of electrical parameters of rock and ore, characterized in that, Comprising: A sample rack, the sample rack includes a first fixture box and a second fixture box for fixing rock and ore samples, and a scale for measuring the length of the rock and ore samples, and the scale is the connecting shaft of the first fixture box and the second fixture box; An execution module, the execution module is electrically connected to the first fixture box and the second fixture box, and is used to collect the response signals of the rock and ore samples by transmitting excitation signals of different frequency points, and process the response signals to obtain acquisition data; A control terminal, the control terminal is electrically connected to the execution module, and is used to issue control instructions to control the execution module, and is also used to receive the acquisition data uploaded by the execution module, and calculate various electrical parameters of the rock and ore samples according to the acquisition data.

2. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 1, characterized in that The first fixture box and the second fixture box are respectively movably connected to both ends of the scale through knobs.

3. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 2, characterized in that Both the first fixture box and the second fixture box are hollow boxes, and a solution is injected into the boxes.

4. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 3, characterized in that, Both the first fixture box and the second fixture box include: A first metal electrode plate and a second metal electrode plate; Both the first metal electrode plate and the second metal electrode plate are immersed in the injected solution; Both the first metal electrode plate and the second metal electrode plate are electrically connected to the execution module.

5. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 4, characterized in that, The execution module includes: A multi-channel synchronous acquisition board, a signal source board, and an embedded control board; The first input end of the multi-channel synchronous acquisition board is connected to the first data transmission end of the embedded control board, the second input ends of the multi-channel synchronous acquisition board are respectively connected to the first metal electrode plate of the first fixture box, the second metal electrode plate of the first fixture box, and the first metal electrode plate of the second fixture box, and the output end of the multi-channel synchronous acquisition board is connected to the positive pole of the signal source board; The negative pole of the signal source board is connected to the second metal electrode plate of the second fixture box; The second data transmission end of the embedded control board is connected to the data transmission end of the control terminal.

6. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 5, characterized in that, The multi-channel synchronous acquisition board includes: A processing unit, a multi-channel ADC unit, a conditioning unit, a buffer unit, and a sampling resistor unit; The first data transmission end of the processing unit is connected to the first data transmission end of the embedded control board, and the second data transmission end of the processing unit is connected to the data transmission end of the multi-channel ADC unit; The input end of the multi-channel ADC unit is connected to the output end of the conditioning unit; The input end of the conditioning unit is connected to the output end of the buffer unit; The first input end of the buffer unit is connected to the first metal electrode plate of the second fixture box, the second input end of the buffer unit is connected to the second metal electrode plate of the first fixture box, the third input end of the buffer unit is respectively connected to the first metal electrode plate of the first fixture box and the first end of the sampling resistance unit, and the fourth input end of the buffer unit is connected to the second end of the sampling resistance unit; The second end of the sampling resistance unit is connected to the positive pole of the signal source board.

7. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 6, characterized in that, The multi-channel synchronous acquisition board further includes an electronic switch and a DAC unit; The data transmission end of the DAC unit is connected to the third data transmission end of the processing unit, the output end of the DAC unit is connected to the input end of the electronic switch, and the output end of the electronic switch is connected to all the input ends of the buffer unit.

8. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 7, characterized in that, The conditioning unit includes: A first multi-stage amplification circuit, a second multi-stage amplification circuit, a third multi-stage amplification circuit, and a fourth multi-stage amplification circuit; A first anti-aliasing filter, a second anti-aliasing filter, a third anti-aliasing filter, and a fourth anti-aliasing filter; The input ends of the first multi-stage amplification circuit, the second multi-stage amplification circuit, the third multi-stage amplification circuit, and the fourth multi-stage amplification circuit are all connected to the output end of the buffer unit; The output end of the first multi-stage amplification circuit is connected to the input end of the first anti-aliasing filter; The output end of the second multi-stage amplification circuit is connected to the input end of the second anti-aliasing filter; The output end of the third multi-stage amplification circuit is connected to the input end of the third anti-aliasing filter; The output end of the fourth multi-stage amplification circuit is connected to the input end of the fourth anti-aliasing filter; The output ends of the first anti-aliasing filter, the second anti-aliasing filter, the third anti-aliasing filter, and the fourth anti-aliasing filter are all connected to the input end of the multi-channel ADC unit.

9. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 8, characterized in that, The conditioning unit further includes: A first single-ended to differential circuit, a second single-ended to differential circuit, a third single-ended to differential circuit, and a fourth single-ended to differential circuit; The input end of the first single-ended to differential circuit is connected to the output end of the first multi-stage amplification circuit, and the output end of the first single-ended to differential circuit is connected to the input end of the first anti-aliasing filter; The input end of the second single-ended to differential circuit is connected to the output end of the second multi-stage amplification circuit, and the output end of the second single-ended to differential circuit is connected to the input end of the second anti-aliasing filter; The input end of the third single-ended to differential circuit is connected to the output end of the third multi-stage amplification circuit, and the output end of the third single-ended to differential circuit is connected to the input end of the third anti-aliasing filter; The input end of the fourth single-ended to differential circuit is connected to the output end of the fourth multi-stage amplification circuit, and the output end of the fourth single-ended to differential circuit is connected to the input end of the fourth anti-aliasing filter.

10. The broadband portable measurement system applied to the measurement of electrical parameters of rock and ore according to claim 9, characterized in that Calculate various electrical parameters of the rock and ore samples according to the collected data, including: Perform a Fourier transform on the voltage data sequence at both ends of the rock and ore sample in the collected data after taking the difference to obtain a first complex sequence, and according to the sampling rate of the execution module, put the first complex sequence in one-to-one correspondence with the frequency point sequence, and extract the complex values corresponding to each frequency point in the frequency point sequence to obtain the complex voltage at both ends of the rock and ore sample at each frequency point; Perform a Fourier transform on the voltage data sequence at both ends of the sampling resistance unit in the collected data after taking the difference to obtain a second complex sequence, and according to the sampling rate of the execution module, put the second complex sequence in one-to-one correspondence with the frequency point sequence, and extract the complex values corresponding to each frequency point in the frequency point sequence to obtain the complex voltage at both ends of the sampling resistance unit at each frequency point; Calculate the complex impedance of the rock and ore sample according to the complex voltage at both ends of the rock and ore sample, the complex voltage at both ends of the sampling resistance unit, and the resistance value of the sampling resistance unit. The calculation expression is: Among them, R x represents the complex impedance of the rock and ore sample, f represents the frequency point, and U AB represents the complex voltage across the rock and ore sample, and U MN represents the complex voltage across the sampling resistance unit, and R s represents the resistance value of the sampling resistance unit; Calculate the resistivity of the rock and ore sample according to the complex impedance of the rock and ore sample, the cross-sectional area of the rock and ore sample, and the length of the rock and ore sample. The calculation expression is: Among them, ρ represents the resistivity of the rock and ore sample, s represents the cross-sectional area of the rock and ore sample, l represents the length of the rock and ore sample, and ||R x (f)|| represents taking the modulus of the complex impedance R x (f) of the rock and ore sample at frequency point f; Calculate the phase and polarizability of the rock and ore sample according to the complex impedance of the rock and ore sample, where, The calculation expression for the phase is: In the formula, represents the phase of the rock and ore sample, Im(R x (f)) represents the imaginary part of the complex impedance of the rock and ore sample, Real(R x (f)) represents the real part of the complex impedance of the rock and ore sample, and atan2(·) is used to calculate the angle value according to the quadrant or coordinate axis where the complex impedance of the rock and ore sample is located; The calculation expression for the polarizability is: In the formula, η represents the polarizability of the rock and ore sample, f0 represents the low-frequency point, and f1 represents the high-frequency point.

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