CN106501136B - Acquisition circuit system and acquisition method for composite ion electrode electromotive force - Google Patents
Acquisition circuit system and acquisition method for composite ion electrode electromotive force Download PDFInfo
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- CN106501136B CN106501136B CN201611037950.7A CN201611037950A CN106501136B CN 106501136 B CN106501136 B CN 106501136B CN 201611037950 A CN201611037950 A CN 201611037950A CN 106501136 B CN106501136 B CN 106501136B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
Abstract
The invention relates to a collecting circuit system and a collecting method of composite ion electrode electromotive force, comprising the following steps: the device comprises a high input impedance amplifying circuit, a first reference voltage circuit, a second reference voltage circuit, a USB-to-serial interface circuit, a processor working circuit, a power supply module circuit and an interface circuit; the input end of the high input impedance amplifying circuit is connected with the positive end and the negative end of the composite electrode respectively, and the output end of the high input impedance amplifying circuit is connected with the working circuit of the processor; the first reference voltage circuit is connected with the high input impedance amplifying circuit; the second reference voltage circuit is connected with the processor working circuit; the USB-to-serial interface circuit is connected with the output end of the processor working circuit and is also connected with the interface circuit; the power supply module is respectively connected with the high input impedance amplifying circuit, the first reference voltage circuit, the second reference voltage circuit and the processor working circuit. The invention adopts a high input impedance amplifying circuit to realize stable acquisition of multi-channel composite ion electrode electromotive force.
Description
Technical Field
The invention relates to the technical field of multi-parameter joint detection of material surface properties, in particular to a circuit system and a method for collecting electromotive force of a composite ion electrode.
Background
Most microscopic processes and macroscopic phenomena in soil are closely related to the surface charge of soil particles, so that five parameters of surface potential, surface electric field intensity, surface charge density, specific surface area and total surface charge of particles (1-1000 nm) greatly influence the physical, chemical and biological properties of the particles, and are of great significance to the measurement and analysis of the surface properties of the substances.
Disclosure of Invention
The invention aims to solve the technical problem of providing a composite ion electrode electromotive force acquisition circuit system and an acquisition method, which are used for acquiring the electrode electromotive force of composite ions in liquid to be detected so as to realize the joint analysis of five parameters of surface potential, surface electric field intensity, surface charge density, specific surface area and total surface charge of particles (1-1000 nm) in the liquid to be detected.
The technical scheme for solving the technical problems is as follows: acquisition circuitry for composite ion electrode electromotive force, comprising: the device comprises a high input impedance amplifying circuit, a first reference voltage circuit, a second reference voltage circuit, a USB-to-serial interface circuit, a processor working circuit, a power supply module circuit and an interface circuit;
the two input ends of the high input impedance amplifying circuit are respectively connected with the positive end and the negative end of the composite electrode, and the signal output end is connected with an analog-digital conversion interface of the processor working circuit;
the first reference voltage circuit is connected with the high input impedance amplifying circuit;
the second reference voltage circuit is connected with the processor working circuit;
the USB-to-serial interface circuit is connected with a serial communication pin of the processor working circuit and is used for transmitting an output signal of the processor working circuit; the interface circuit is also connected with the processor working circuit and is used for outputting signals from the processor working circuit;
the power supply module is respectively connected with the high input impedance amplifying circuit, the first reference voltage circuit, the second reference voltage circuit and the processor working circuit and used for providing working voltages of the circuits.
The beneficial effects of the invention are as follows: the high input impedance amplifying circuit can effectively convert the electromotive force signal of the composite ion electrode stably, and convert the electromotive force signal into a digital signal through analog-to-digital conversion, and can also convert the electromotive force signal of the negative electricity after adding bias voltage, and can effectively collect the electromotive force signal of the multi-channel composite ion electrode under the cooperation of other circuits, and the linearity is extremely high through calibration experiment verification, so that the multi-parameter composite ion electrode is used for the multi-parameter joint analysis of the surface property of a substance.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the high input impedance amplifying circuit includes at least two high input impedance amplifying circuits, wherein each high input impedance amplifying circuit includes: a first high input impedance integrated operational amplifier, a second high input impedance integrated operational amplifier, and a third high input impedance integrated operational amplifier;
the input end of the first high input impedance integrated operational amplifier and the input end of the second high input impedance integrated operational amplifier are respectively connected with the positive end and the negative end of the composite electrode;
the output end of the first high input impedance integrated operational amplifier and the output end of the second high input impedance integrated operational amplifier are respectively connected with the input end of the third high input impedance integrated operational amplifier;
and the output end of the third high input impedance integrated operational amplifier is connected with an analog-to-digital conversion interface of the processor working circuit.
The invention has the further beneficial effects that: the acquisition circuit system of the composite ion electrode electromotive force can contain a plurality of high input impedance amplifying circuits to acquire the multi-channel composite ion electrode electromotive force, so that the electrode electromotive force of a plurality of groups of composite ions in the liquid to be detected can be acquired simultaneously, and further, the combined analysis of five parameters of surface potential, surface electric field intensity, surface charge density, specific surface area and total surface charge of particles (1-1000 nm) in the liquid to be detected can be realized. In the high input impedance amplifying circuit, the first high input impedance integrated operational amplifier and the second high input impedance integrated operational amplifier are used as voltage followers to improve input impedance; the third high input impedance integrated operational amplifier functions as a differential amplifier to suppress common mode interference.
Further, the first reference voltage circuit includes a first reference voltage chip, a first voltage follower, and a first potentiometer, and the second reference voltage circuit includes: the second reference voltage chip, the second voltage follower and the second potentiometer;
the first reference voltage chip is connected with the first potentiometer to adjust the reference voltage of the first reference voltage circuit, and the second reference voltage chip is connected with the second potentiometer to adjust the reference voltage of the second reference voltage circuit;
one end of the first potentiometer is connected with the input end of the first voltage follower, the other end of the first potentiometer is connected with the first reference voltage chip and grounded, one end of the second potentiometer is connected with the input end of the second voltage follower, and the other end of the second potentiometer is connected with the second reference voltage chip and grounded;
the output end of the first voltage follower is connected with the output end of the second high input impedance integrated operational amplifier;
and the output end of the second voltage follower is connected with the working circuit of the processor.
The invention has the further beneficial effects that; the first reference voltage circuit and the second reference voltage circuit respectively provide bias voltage for the high input impedance amplifying circuit and reference voltage for the working circuit of the processor, so that the acquisition of the electromotive force of the composite ion electrode and the data processing are smoothly carried out. In addition, the use of the potentiometer can realize that the reference voltage circuit provides adjustable bias voltage and reference voltage according to actual needs, and meanwhile, the use of the voltage follower ensures that the bias voltage input into the high-input-impedance amplifying circuit and the reference voltage input into the working circuit of the processor are stable.
Further, the USB to serial interface circuit includes: a capture chip and a clock peripheral circuit, wherein,
the clock peripheral circuit includes: a crystal oscillator Y1, a first capacitor C14 and a second capacitor C15; the first end of Y1 and the first end of C14 are respectively connected with the acquisition chip; the second end of the Y1 and the first end of the C15 are respectively connected with the acquisition chip; the second end of C14 is grounded to the second end of C15.
Further, the processor working circuit comprises an integrated chip, a working indicator light circuit, a keyboard circuit, a power indicator light circuit, a first decoupling capacitor, a second decoupling capacitor, a first working power interface, a second working power interface and a temperature sensor data end, wherein the working indicator light circuit, the keyboard circuit, the power indicator light circuit, the first decoupling capacitor, the second decoupling capacitor and the temperature sensor data end are respectively connected with the integrated chip;
the work pilot lamp circuit for to the display control of pilot lamp includes: the first current limiting resistor R23, the second current limiting resistor R24, the third current limiting resistor R25, the fourth current limiting resistor R26 and the fifth current limiting resistor R27, and the first light emitting diode DS2, the second light emitting diode DS3, the third light emitting diode DS4, the fourth light emitting diode DS5 and the fifth light emitting diode DS6, wherein anodes of DS2, DS3, DS4, DS5 and DS6 are respectively connected with the integrated chip 511, a cathode of DS2 is connected with one end of R27, a cathode of DS3 is connected with one end of R23, a cathode of DS4 is connected with one end of R24, a cathode of DS5 is connected with one end of R25, and a cathode of DS6 is connected with one end of R26; the other end of R23, the other end of R24, the other end of R25, the other end of R26 and the other end of R27 are respectively grounded;
the keyboard circuit comprises: the first pull-up resistor R28, the second pull-up resistor R29, the third pull-up resistor R30, the first key S1, the second key S2 and the third key S3, wherein one end of the S1 is connected with one end of the R28 and is respectively connected with the integrated chip; one end of S2 is connected with one end of R29 and is respectively connected with the integrated chip; one end of S3 is connected with one end of R30 and is respectively connected with the integrated chip; the other end of the S1, the other end of the S2 and the other end of the S3 are respectively grounded; the other end of R28, the other end of R29 and the other end of R30 are respectively connected with the first working power interface;
the power indicator circuit comprises: a sixth light emitting diode DS7 and a sixth current limiting resistor R31, wherein a negative electrode of DS7 is connected to one end of R31; the anode of DS7 is connected with the first working power interface; the other end of R31 is grounded;
the second working power supply interface is connected with the first decoupling capacitor and the second decoupling capacitor, and the first decoupling capacitor and the second decoupling capacitor are connected in parallel so as to enhance the stability of the working power supply;
the data end of the temperature sensor is connected with one end of a fourth pull-up resistor R32 and is also connected with the temperature sensor, and the other end of the R32 is connected with the first working power interface.
The invention has the further beneficial effects that: the processor working circuit is used for carrying out analog-to-digital conversion on the electrode electromotive force input by the high input impedance amplifying circuit, and is also connected with the temperature sensor to realize real-time monitoring of the temperature of the liquid to be detected so as to be used for multi-parameter joint analysis of the substance surface properties. The processor working circuit is provided with a keyboard circuit, a working indicator light circuit, a power indicator light, a first decoupling capacitor and a second decoupling capacitor, wherein the keyboard circuit, the working indicator light circuit and the power indicator light are used for program debugging, the first decoupling capacitor and the second decoupling capacitor are used for enhancing stability of a working power supply, and the working of the processor working circuit is conveniently controlled, so that electrode electromotive force data can be processed and uploaded.
Further, the power supply module circuit includes: the integrated power supply module comprises a first voltage stabilizing chip, a second voltage stabilizing chip and a third voltage stabilizing chip; the first voltage stabilizing chip, the second voltage stabilizing chip and the third voltage stabilizing chip are respectively connected with the integrated power module;
the integrated power supply module converts an input voltage with wide voltage into positive and negative voltages;
the first voltage stabilizing chip is connected with the integrated chip of the processor working circuit, and is also connected with the first reference voltage circuit and the second reference voltage circuit and used for providing working power supply;
the second voltage stabilizing chip and the third voltage stabilizing chip are respectively connected with the first high input impedance integrated operational amplifier, the second high input impedance integrated operational amplifier and the positive working power supply input end and the negative working power supply input end of the third high input impedance integrated operational amplifier and are used for providing positive and negative working voltages.
The interface circuit includes: USB interface, temperature sensor interface and combined electrode interface.
The invention also provides a collecting method of the collecting circuit system based on the composite ion electrode electromotive force in each embodiment, which comprises the following steps:
step one: positive and negative potentials of the composite electrode are respectively transmitted to the high input impedance amplifying circuit through positive and negative input ends of the high input impedance amplifying circuit through the composite electrode interface;
step two: the first reference voltage circuit inputs direct current bias to the high input impedance amplifying circuit, and the high input impedance amplifying circuit outputs analog voltage of composite ion electrode electromotive force and inputs the analog voltage to the processor working circuit;
step three: the second reference voltage circuit provides reference voltage for an analog-to-digital converter in the processor working circuit, and the processor working circuit converts the composite ion electrode electromotive force into a digital signal and transmits the digital signal to the USB-to-serial interface circuit;
step four: the USB-to-serial interface circuit transmits the digital signal to an upper computer through the interface circuit for joint analysis.
The beneficial effects of the invention are as follows: the high input impedance amplifying circuit can effectively convert the electromotive force signals of the composite ion electrode stably, and convert the electromotive force signals into digital signals through analog-to-digital conversion, and can also convert the negative electromotive force signals into analog-to-digital conversion after bias voltage is added, and can effectively collect the electromotive force signals of the multi-channel composite ion electrode under the cooperation of other circuits, and the linearity is extremely high through calibration experiment verification, so that the multi-parameter composite ion electrode is used for the multi-parameter joint analysis of the surface properties of substances.
Further, in the reference voltage circuit, an output signal of the reference voltage chip flows through the voltage follower to improve driving capability of the output signal.
Further, a pull-up resistor in the processor operating circuit provides a stable digital signal for the data terminal of the temperature sensor.
The invention has the further beneficial effects that: the working circuit of the processor in the system can be connected with a temperature sensor for monitoring the temperature of the measured liquid in real time, and the temperature and the electrode electromotive force signals are output together, so that the multi-parameter joint analysis and measurement of the substance surface property can be further completed.
Drawings
FIG. 1 is a block diagram of a composite ion electrode electromotive force acquisition circuit system according to an embodiment of the present invention;
FIG. 2 (a) is a schematic diagram of a specific circuit structure of a high input impedance amplifying circuit included in the acquisition circuit system of the electromotive force of the composite ion electrode shown in FIG. 1;
FIG. 2 (b) is a schematic diagram of another specific circuit configuration of a high input impedance amplifying circuit included in the acquisition circuit system of the electromotive force of the composite ion electrode shown in FIG. 1;
FIG. 3 is a schematic diagram of a specific circuit structure of a first reference voltage circuit included in the acquisition circuit system of the electromotive force of the composite ion electrode shown in FIG. 1;
FIG. 4 is a schematic diagram of a specific circuit structure of a second reference voltage circuit included in the acquisition circuit system of the electromotive force of the composite ion electrode shown in FIG. 1;
FIG. 5 is a schematic diagram of a specific circuit structure of a USB-to-serial interface circuit included in the acquisition circuit system of the composite ion electrode electromotive force shown in FIG. 1;
FIG. 6 is a schematic diagram of a specific circuit configuration of a processor operating circuit included in the acquisition circuit system of the composite ion electrode electromotive force shown in FIG. 1;
FIG. 7 is a schematic diagram of a specific circuit configuration of a power supply module circuit included in the acquisition circuit system of the electromotive force of the composite ion electrode shown in FIG. 1;
FIG. 8 is a schematic diagram of a specific circuit configuration of an interface circuit included in the acquisition circuit system of the electromotive force of the composite ion electrode shown in FIG. 1;
fig. 9 is a flow chart of a method for collecting an electromotive force of a composite ion electrode according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, the acquisition circuitry of the composite ion electrode electromotive force includes: the high input impedance amplifying circuit 110, the first reference voltage circuit 210, the second reference voltage circuit 310, the USB-to-serial interface circuit 410, the processor operating circuit 510, the power supply module circuit 610, the interface circuit 710 and the temperature sensor 810. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the two input ends of the high input impedance amplifying circuit 110 are respectively connected with the positive end and the negative end of the composite electrode, and the signal output end is connected with an analog-digital conversion interface of the processor working circuit 510. The first reference voltage circuit 210 is connected to the high input impedance amplifying circuit 110. The second reference voltage circuit 310 is connected to the processor operating circuit 510.
The USB-to-serial interface circuit 410 is connected to a serial communication pin of the processor operating circuit 510, and is used for transmitting an output signal of the processor operating circuit 510. The USB to serial interface circuit 410 is also coupled to the interface circuit 710 for outputting signals from the processor operating circuit 510. The power supply module 610 is connected to the high input impedance amplifying circuit 110, the first reference voltage circuit 210, the second reference voltage circuit 310 and the processor operating circuit 510, respectively, for providing operating voltages of the respective circuits.
According to the acquisition circuit system for the electromotive force of the composite ion electrode, provided by the embodiment, the high input impedance amplifying circuit can be used for effectively and stably converting the electromotive force signal of the composite ion electrode, the analog-digital conversion is carried out on the digital signal, the analog-digital conversion is carried out on the negative electromotive force signal after the bias voltage is added, the electromotive force signal of the multi-channel composite ion electrode can be effectively acquired under the cooperation of other circuits, and the linearity is extremely high through calibration experiment verification, so that the acquisition circuit system is used for multi-parameter joint analysis of the surface property of a substance.
In one embodiment, the high input impedance amplifying circuit 110 comprises at least two high input impedance amplifying circuits, wherein each high input impedance amplifying circuit comprises: a first high input impedance integrated operational amplifier, a second high input impedance integrated operational amplifier, and a third high input impedance integrated operational amplifier.
The input end of the first high input impedance integrated operational amplifier and the input end of the second high input impedance integrated operational amplifier are respectively connected with the positive end and the negative end of the composite electrode. The output end of the first high input impedance integrated operational amplifier and the output end of the second high input impedance integrated operational amplifier are respectively connected with the input end of the third high input impedance integrated operational amplifier. The output end of the third high input impedance integrated operational amplifier is connected with an analog-to-digital conversion interface of the processor working circuit.
The technical scheme of the invention is described in detail below by taking an acquisition circuit system of the electromotive force of the two-channel composite ion electrode as an example.
As shown in fig. 2 (a), the first high input impedance amplifying circuit 110 includes: a first high input impedance integrated operational amplifier 111, a second high input impedance integrated operational amplifier 112 and a third high input impedance integrated operational amplifier 113. As shown in fig. 2 (b), the second high input impedance amplifying circuit 120 includes: a first high input impedance integrated operational amplifier 121, a second high input impedance integrated operational amplifier 122, and a third high input impedance integrated operational amplifier 123; the capacitors C1-1, C1-2, C1-3, C1-4, C1-5 in the first high input impedance amplifying circuit 110 and the second high input impedance amplifying circuit 120 are decoupling capacitors.
Specifically, in this embodiment, the output terminal of the first high input impedance integrated operational amplifier 111 and the output terminal of the second high input impedance integrated operational amplifier 112 are respectively connected to the input terminal of the third high input impedance integrated operational amplifier 113, and the output terminal of the first high input impedance integrated operational amplifier 121 and the output terminal of the second high input impedance integrated operational amplifier 122 are respectively connected to the input terminal of the third high input impedance integrated operational amplifier 123, wherein the first high input impedance integrated operational amplifier 111, the first high input impedance integrated operational amplifier 121, the second high input impedance integrated operational amplifier 112 and the second high input impedance integrated operational amplifier 122 are respectively used as voltage followers to increase the input impedance; the third high input impedance integrated operational amplifier 113 and the third high input impedance integrated operational amplifier 123 function as differential amplifiers, respectively, to suppress common mode interference.
In another embodiment, as shown in fig. 3, the first reference voltage circuit 210 includes a first reference voltage chip 210, a first voltage follower 212, and a first potentiometer 213.
Specifically, in this embodiment, the first reference voltage chip 211 is connected to the middle position of the first potentiometer 213, and the connection position is changed as long as the current flowing through the reference voltage chip is 60uA < I Q And the reference voltage can be regulated within the range of 1.233-10V by being less than 12 mA.
One end of the first potentiometer 213 is connected to the input end of the first voltage follower 212, and the other end of the first potentiometer 213 is connected to the first reference voltage chip 211 and grounded. The output of the first voltage follower 212 is connected to the outputs of the second high input impedance integrated operational amplifier 112 and the second high input impedance integrated operational amplifier 122.
In another embodiment, as shown in fig. 4, the second reference voltage circuit 310 includes: a second reference voltage chip 311, a second voltage follower 312, and a second potentiometer 313.
Specifically, in this embodiment, the second reference voltage chip 311 is connected to the middle position of the second potentiometer 313, and the connection position is changed as long as the current flowing through the reference voltage chip is 60uA < I Q And the reference voltage can be regulated within the range of 1.233-10V by being less than 12 mA.
One end of the second potentiometer 313 is connected to the input end of the second voltage follower 312, and the other end of the second potentiometer 313 is connected to the second reference voltage chip 311 and grounded. The output of the second voltage follower 312 is connected to the processor operating circuit 510.
In another embodiment, as shown in fig. 5, the USB to serial interface circuit 410 includes: a capture chip 411 and clock peripheral circuits 412. Wherein, the acquisition chip 411 is ch340t. The clock peripheral circuit 412 includes: a crystal oscillator Y1, a first capacitor C14 and a second capacitor C15. The first end of Y1 and the first end of C14 are respectively connected with the acquisition chip (411). The second end of Y1 and the first end of C15 are respectively connected with the acquisition chip (411). The second end of C14 is grounded to the second end of C15. The capacitor C19, the capacitor C20, and the capacitor C21 function as decoupling capacitors, respectively.
In another embodiment, as shown in FIG. 6, the processor operating circuit 510 includes: the integrated chip 511, the operation indicator light circuit 512, the keyboard circuit 513, the power indicator light circuit 514, the first decoupling capacitor 515, the second decoupling capacitor 516, the first operation power interface 517, the second operation power interface 518, and the temperature sensor data terminal 519, and the operation indicator light circuit 512, the keyboard circuit 513, the power indicator light circuit 514, the first decoupling capacitor 515, the second decoupling capacitor 516, and the temperature sensor data terminal 519 are connected to the integrated chip 511, respectively. Wherein, the liquid crystal display device comprises a liquid crystal display device,
specifically, in this embodiment, the integrated chip 511 is a stc15F2K60S2 integrated chip, and the chip has a core of 51, belongs to an enhanced 51 single chip microcomputer, and is internally integrated with a 10-bit AD converter, so that the speed is high, and the performance is stable.
An operation indicator light circuit 512 for controlling the display of the indicator light, comprising: the first, second, third, fourth and fifth current limiting resistors R23, R24, R25, R26 and R27, and the first, second, third and fifth light emitting diodes DS2, DS3, DS4, DS5 and DS6. Wherein, the anodes of DS2, DS3, DS4, DS5 and DS6 are respectively connected with the integrated chip 511, the cathode of DS2 is connected with one end of R27, the cathode of DS3 is connected with one end of R23, the cathode of DS4 is connected with one end of R24, the cathode of DS5 is connected with one end of R25, the cathode of DS6 is connected with one end of R26, the other end of R23, the other end of R24, the other end of R25, the other end of R26 and the other end of R27 are respectively grounded.
The keyboard circuit 513 includes: a first pull-up resistor R28, a second pull-up resistor R29 and a third pull-up resistor R30, and a first key S1, a second key S2 and a third key S3. One end of S1 is connected to one end of R28 and to each of the integrated chips 511. One end of S2 is connected to one end of R29 and to the integrated chips 511, respectively. One end of S3 is connected to one end of R30 and to the integrated chips 511, respectively. The other end of S1, the other end of S2 and the other end of S3 are respectively grounded. The other end of R28, the other end of R29, and the other end of R30 are respectively connected to the first operation power interface 517.
The power indicator light circuit 514 includes: a sixth light emitting diode DS7 and a sixth current limiting resistor R31. Wherein, the negative pole of DS7 is connected with one end of R31, and the positive pole of DS7 is connected with first working power interface 517, and the other end ground of R31.
A second operating power interface 518 of processor operating circuit 510 is connected to first decoupling capacitor 515 and second decoupling capacitor 516, and first decoupling capacitor 515 and second decoupling capacitor 516 are connected in parallel to enhance the stability of the operating power supply.
The temperature sensor data terminal 519 is connected to one end of the fourth pull-up resistor R32, and is also connected to the temperature sensor, and the other end of the resistor R32 is connected to the first operation power interface 517.
In another embodiment, as shown in fig. 7, the power supply module circuit 610 includes: the power module 611, the first voltage regulator chip 612, the second voltage regulator chip 613 and the third voltage regulator chip 614 are integrated. The first voltage stabilizing chip 612, the second voltage stabilizing chip 613 and the third voltage stabilizing chip 614 are respectively connected with the integrated power module 611. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the integrated power module 611 can convert a wide voltage input voltage of 9-18V into a positive and negative 12V voltage, wherein the wide voltage refers to a wide voltage value range of the input voltage. The second voltage stabilizing chip 613 and the third voltage stabilizing chip 614 are respectively connected with the first high input impedance integrated operational amplifier 111, the second high input impedance integrated operational amplifier 112, the third high input impedance integrated operational amplifier 113, the first high input impedance integrated operational amplifier 121, the second high input impedance integrated operational amplifier 122 and the third high input impedance integrated operational amplifier 123, and are used for providing positive and negative working voltages.
In another embodiment, as shown in fig. 8, the interface circuit 710 includes: a USB interface 711, a temperature sensor interface 712, and a composite electrode interface 713.
Specifically, in one embodiment, the following connection relationships may be provided between the circuits in fig. 2, 3, 4, 5, 6, 7, and 8 as follows:
the ch+ terminal and the CH-terminal of the first channel high input impedance amplifying circuit 110 are respectively connected to the positive terminal and the negative terminal of the composite electrode, and the signal output terminal CH1OUT is connected to the analog-to-digital conversion interface CH1OUT of the processor working circuit 510. The ch+ end and the CH-end of the second channel high input impedance amplifying circuit 120 are respectively connected with the positive end and the negative end of the other composite electrode, and the signal output end CH2OUT is connected with the analog-digital conversion interface CH2OUT of the processor working circuit 510 for collecting electrode electromotive force and processing data.
The bias voltage output terminal VR of the first reference voltage circuit 210 is connected to the bias voltage input terminal VR of the first high input impedance amplifying circuit 110 and the bias voltage input terminal VR of the second high input impedance amplifying circuit 120.
The reference voltage output VR2.5 of the second reference voltage circuit 310 is coupled to the reference voltage input VR2.5 of the processor operating circuit 510.
The data input terminal ispxd of the USB to serial interface circuit 410 is connected to the serial communication pin terminal ispxd of the processor working circuit 510, and the data input terminal isptdxd of the USB to serial interface circuit 410 is connected to the serial communication pin terminal isptdd of the processor working circuit 510, for transmitting an output signal of the processor working circuit 510. The d+ and D-terminals of the USB-to-serial interface circuit 410 are connected to the d+ and D-terminals of the USB interface 711 in the interface circuit 710, respectively, for outputting signals from the processor operating circuit 510.
The temperature sensor data terminal DQ of the processor operating circuit 510 is connected to a temperature sensor for monitoring the temperature in real time.
The power supply module 610 is connected to the VCC terminal of the first channel high input impedance amplifying circuit 110, the second channel high input impedance amplifying circuit 120, the first reference voltage circuit 210, the second reference voltage circuit 310, the USB to serial interface circuit 410, the processor operating circuit 510, and the interface circuit diagram 710, respectively, for providing the operating voltages of the circuits.
And the connection and the matching of the circuits are combined to form a collecting circuit system of the electromotive force of the two-channel composite ion electrode. The high input impedance amplifying circuit can effectively convert the electromotive force signals of the composite ion electrode stably, and convert the electromotive force signals into digital signals through analog-to-digital conversion, and can also convert the negative electromotive force signals into analog-to-digital conversion after the bias voltage is added, a multi-channel high input impedance amplifying circuit is formed under the existence of a plurality of high input impedance amplifying circuits, electromotive force signals of the multi-channel composite ion electrode can be effectively collected under the cooperation of other circuits, and the linearity is extremely high through calibration experiment verification, so that the multi-parameter composite ion electrode is used for the multi-parameter joint analysis of the surface properties of substances.
The above detailed description is given to the acquisition circuit system of the composite ion electrode electromotive force provided by the embodiment of the present invention with reference to fig. 1 to 8, and the detailed description is given below to the acquisition method of the acquisition circuit system of the composite ion electrode electromotive force based on the embodiment of the present invention with reference to fig. 9.
As shown in fig. 9, a method for collecting a collecting circuit system based on electromotive force of a composite ion electrode includes:
910, positive and negative potentials of the first composite electrode are respectively transmitted to the first high input impedance amplifying circuit 110 through the ch+ end and the CH-end of the first high input impedance amplifying circuit 110 through the composite electrode interface, and positive and negative potentials of the second composite electrode are respectively transmitted to the first high input impedance amplifying circuit 120 through the ch+ end and the CH-end of the second high input impedance amplifying circuit 120 through the composite electrode interface.
920, the first reference voltage circuit 210 inputs dc biases to the first high input impedance amplifying circuit 110 and the second high input impedance amplifying circuit 120, respectively, and the first high input impedance amplifying circuit 110 and the second high input impedance amplifying circuit 120 input analog voltages of the first complex ion electrode electromotive force and the second complex ion electrode electromotive force to the CH1OUT terminal and the CH2OUT terminal of the processor operating circuit 510 through the CH1OUT terminal and the CH2OUT terminal, respectively.
930, the second reference voltage circuit 310 provides a reference voltage for the integrated chip 511 in the processor working circuit 510, where the processor working circuit 510 converts the analog voltage of the first composite ion electrode electromotive force and the analog voltage of the second composite ion electrode electromotive force into a first digital signal and a second digital signal, and transmits the first digital signal and the second digital signal to the USB-to-serial interface circuit 410, and meanwhile, the processor working circuit 510 collects temperature data of the temperature sensor, and processes the temperature data through the integrated chip 511 to convert the temperature data into a third digital signal.
940, the USB-to-serial interface circuit 410 transmits the first digital signal, the second digital signal, and the third digital signal to the host computer via the USB interface for joint analysis.
According to the acquisition method of the acquisition circuit system based on the composite ion electrode electromotive force, provided by the embodiment, the high input impedance amplifying circuit is used for effectively performing stable conversion on the composite ion electrode electromotive force signal, performing analog-to-digital conversion on the composite ion electrode electromotive force signal into a digital signal, performing analog-to-digital conversion on a negative electromotive force signal after the bias voltage is added, forming a multi-channel high input impedance amplifying circuit in the presence of a plurality of high input impedance amplifying circuits, effectively acquiring the multi-channel composite ion electrode electromotive force signal in the presence of the high input impedance amplifying circuits, and performing calibration experiment verification, wherein the linearity is extremely high, and simultaneously acquiring the environmental temperature of the measured liquid in real time, so that the method is convenient for substance surface property multi-parameter joint analysis.
It should be noted that, in the collecting circuit system of the composite ion electrode electromotive force provided by the invention, the high input impedance amplifying circuit can also contain 3, 4, 5 or more, correspondingly, the integrated chip in the working circuit of the processor correspondingly contains 3, 4, 5 or more analog-digital conversion interfaces, and other circuits are correspondingly matched, so that the collecting circuit system of the three-channel composite ion electrode electromotive force, the collecting circuit system of the four-channel composite ion electrode electromotive force, the collecting circuit system of the five-channel composite ion electrode electromotive force or the collecting circuit system of the five-channel composite ion electrode electromotive force can be formed.
In addition, the collecting circuit system of three-channel composite ion electrode electromotive force, the collecting circuit system of four-channel composite ion electrode electromotive force, the collecting circuit system of five-channel composite ion electrode electromotive force or the collecting method of more channel composite ion electrode electromotive force is the same as the collecting method of the collecting circuit system of two-channel composite ion electrode electromotive force, wherein when the collecting circuit system of multi-channel composite ion electrode electromotive force works, only part of channels can participate in the collecting work of composite ion electrode electromotive force, for example, in the collecting circuit system of five-channel composite ion electrode electromotive force, only three high input impedance amplifying circuits are connected with three groups of composite electrodes, and the electromotive forces of the three groups of composite electrodes are collected simultaneously for the multi-parameter joint analysis of the surface property of substances.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. An acquisition circuit system for electromotive force of a composite ion electrode, comprising: a high input impedance amplifying circuit (110), a first reference voltage circuit (210), a second reference voltage circuit (310), a USB-to-serial interface circuit (410), a processor operating circuit (510), a power supply module circuit (610) and an interface circuit (710);
two input ends of the high input impedance amplifying circuit (110) are respectively connected with the positive end and the negative end of the composite electrode, and the signal output end is connected with an analog-digital conversion interface of the processor working circuit (510);
the first reference voltage circuit (210) is connected with the high input impedance amplifying circuit (110);
the second reference voltage circuit (310) is connected with the processor working circuit (510);
the USB-to-serial interface circuit (410) is connected with a serial communication pin of the processor working circuit (510) and is used for transmitting an output signal of the processor working circuit (510); is also connected to the interface circuit (710) for outputting a signal from the processor operating circuit (510);
the power supply module circuit (610) is respectively connected with the high input impedance amplifying circuit (110), the first reference voltage circuit (210), the second reference voltage circuit (310) and the processor working circuit (510) and is used for providing working voltages of the circuits;
the high input impedance amplifying circuit (110) comprises at least two high input impedance amplifying circuits, wherein each high input impedance amplifying circuit comprises: a first high input impedance integrated operational amplifier (111), a second high input impedance integrated operational amplifier (112) and a third high input impedance integrated operational amplifier (113);
the input end of the first high input impedance integrated operational amplifier (111) and the input end of the second high input impedance integrated operational amplifier (112) are respectively connected with the positive end and the negative end of the composite electrode;
the output end of the first high input impedance integrated operational amplifier (111) and the output end of the second high input impedance integrated operational amplifier (112) are respectively connected with the input end of the third high input impedance integrated operational amplifier (113);
the output end of the third high input impedance integrated operational amplifier (113) is connected with an analog-to-digital conversion interface of the processor working circuit (510);
the first reference voltage circuit (210) includes a first reference voltage chip (211), a first voltage follower (212), and a first potentiometer (213), and the second reference voltage circuit (310) includes: a second reference voltage chip (311), a second voltage follower (312) and a second potentiometer (313);
the first reference voltage chip (211) is connected with the middle position of the first potentiometer (213) to adjust the reference voltage of the first reference voltage circuit (210), and the second reference voltage chip (311) is connected with the middle position of the second potentiometer (313) to adjust the reference voltage of the second reference voltage circuit (310);
one end of the first potentiometer (213) is connected with the input end of the first voltage follower (212), the other end of the first potentiometer (213) is connected with the first reference voltage chip (211) and grounded, one end of the second potentiometer (313) is connected with the input end of the second voltage follower (312), and the other end of the second potentiometer (313) is connected with the second reference voltage chip (311) and grounded;
the output end of the first voltage follower (212) is connected with the output end of the second high input impedance integrated operational amplifier (112);
the output end of the second voltage follower (312) is connected with the processor working circuit (510);
the interface circuit (710) includes: a USB interface (711), a temperature sensor interface (712) and a composite electrode interface (713).
2. The system of claim 1, wherein the USB-to-serial interface circuit (410) includes: an acquisition chip (411) and a clock peripheral circuit (412), wherein,
the clock peripheral circuit (412) includes: a crystal oscillator Y1, a first capacitor C14 and a second capacitor C15; the first end of the crystal oscillator Y1 and the first end of the first capacitor C14 are respectively connected with the acquisition chip (411); the second end of the crystal oscillator Y1 and the first end of the second capacitor C15 are respectively connected with the acquisition chip (411); the second end of the first capacitor C14 is grounded to the second end of the second capacitor C15.
3. The system of claim 2, wherein the processor operating circuit (510) comprises an integrated chip (511), an operating indicator light circuit (512), a keyboard circuit (513), a power indicator light circuit (514), a first decoupling capacitor (515), a second decoupling capacitor (516), a first operating power interface (517), a second operating power interface (518), and a temperature sensor data terminal (519), and wherein the operating indicator light circuit (512), the keyboard circuit (513), the power indicator light circuit (514), the first decoupling capacitor (515), the second decoupling capacitor (516), and the temperature sensor data terminal (519) are respectively connected to the integrated chip (511);
the work indicator light circuit (512) is used for controlling the display of the indicator light, and comprises: the LED driving circuit comprises a first current limiting resistor R23, a second current limiting resistor R24, a third current limiting resistor R25, a fourth current limiting resistor R26 and a fifth current limiting resistor R27, and a first LED DS2, a second LED DS3, a third LED DS4, a fourth LED DS5 and a fifth LED DS6, wherein the anodes of DS2, DS3, DS4, DS5 and DS6 are respectively connected with the integrated chip (511), the negative electrode of DS2 is connected with one end of R27, the negative electrode of DS3 is connected with one end of R23, the negative electrode of DS4 is connected with one end of R24, the negative electrode of DS5 is connected with one end of R25, and the negative electrode of DS6 is connected with one end of R26; the other end of R23, the other end of R24, the other end of R25, the other end of R26 and the other end of R27 are respectively grounded;
the keyboard circuit (513) comprises: the first pull-up resistor R28, the second pull-up resistor R29 and the third pull-up resistor R30, and the first key S1, the second key S2 and the third key S3, wherein one end of the S1 is connected with one end of the R28 and is respectively connected with the integrated chip (511); one end of S2 is connected with one end of R29 and is respectively connected with the integrated chip (511); one end of S3 is connected with one end of R30 and is respectively connected with the integrated chip (511); the other end of the S1, the other end of the S2 and the other end of the S3 are respectively grounded; the other end of R28, the other end of R29 and the other end of R30 are respectively connected with the first working power interface (517);
the power indicator light circuit (514) includes: a sixth light emitting diode DS7 and a sixth current limiting resistor R31, wherein a negative electrode of DS7 is connected to one end of R31; the anode of DS7 is connected with the first working power interface (517); the other end of R31 is grounded;
the second working power supply interface (518) is connected with the first decoupling capacitor (515) and the second decoupling capacitor (516), and the first decoupling capacitor (515) and the second decoupling capacitor (516) are connected in parallel so as to enhance the stability of the working power supply;
the temperature sensor data end (519) is connected with one end of a fourth pull-up resistor R32, and is also connected with a temperature sensor, and the other end of the R32 is connected with the first working power interface (517).
4. A composite ion electrode electromotive force acquisition circuit system according to claim 3, characterized in that the power supply module circuit (610) comprises: an integrated power module (611), a first voltage regulator chip (612), a second voltage regulator chip (613), and a third voltage regulator chip (614); the first voltage stabilizing chip (612), the second voltage stabilizing chip (613) and the third voltage stabilizing chip (614) are respectively connected with the integrated power module (611);
the integrated power module (611) converts a wide voltage input voltage into a positive and negative voltage;
the first voltage stabilizing chip (612) is connected with the integrated chip (511) of the processor working circuit (510) and is also connected with the first reference voltage circuit (210) and the second reference voltage circuit (310) for providing working power supply;
the second voltage stabilizing chip (613) is respectively connected with the positive working power supply input ends of the first high input impedance integrated operational amplifier (111), the second high input impedance integrated operational amplifier (112) and the third high input impedance integrated operational amplifier (113); the third voltage stabilizing chip (614) is respectively connected with the negative working power supply input ends of the first high input impedance integrated operational amplifier (111), the second high input impedance integrated operational amplifier (112) and the third high input impedance integrated operational amplifier (113); for providing positive and negative operating voltages.
5. A method of acquisition based on the composite ion electrode electromotive force acquisition circuitry as claimed in claim 3 or 4, comprising:
step one: positive and negative potentials of the composite electrode are respectively transmitted to the high input impedance amplifying circuit through positive and negative input ends of the high input impedance amplifying circuit through the composite electrode interface;
step two: the first reference voltage circuit inputs direct current bias to the high input impedance amplifying circuit, and the high input impedance amplifying circuit outputs analog voltage of composite ion electrode electromotive force and inputs the analog voltage to the processor working circuit;
step three: the second reference voltage circuit provides reference voltage for an analog-to-digital converter in the processor working circuit, and the processor working circuit converts the composite ion electrode electromotive force into a digital signal and transmits the digital signal to the USB-to-serial interface circuit;
step four: the USB-to-serial interface circuit transmits the digital signal to the upper computer through the interface circuit for analysis.
6. The method according to claim 5, wherein in the first reference voltage circuit (210), an output signal of the first reference voltage chip (211) flows through the first voltage follower (212) to improve a driving capability of the output signal; in the second reference voltage circuit (310), an output signal of the second reference voltage chip (311) flows through the second voltage follower (312); to improve the driving capability of the output signal.
7. The method of claim 5 or 6, wherein a fourth pull-up resistor in the processor operating circuit provides a stable digital signal to the data side of the temperature sensor.
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