CN209745845U - Liquid chemical detection sensor and detection device - Google Patents
Liquid chemical detection sensor and detection device Download PDFInfo
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- CN209745845U CN209745845U CN201920467634.6U CN201920467634U CN209745845U CN 209745845 U CN209745845 U CN 209745845U CN 201920467634 U CN201920467634 U CN 201920467634U CN 209745845 U CN209745845 U CN 209745845U
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Abstract
The utility model relates to a liquid chemical detection sensor and a detection device; the liquid chemical detection sensor comprises a substrate, wherein a micro-strip transmission line and N open resonators are arranged on the upper surface of the substrate, the N open resonators are arranged on one side or two sides of the micro-strip transmission line, M bent micro-channels are embedded in the substrate, the M micro-channels are positioned below the micro-strip transmission line and/or the open resonators, the inlet and the outlet of each micro-channel are arranged on the upper surface of the substrate, and a bottom electrode layer is arranged on the lower surface of the substrate; the detection device with the detection sensor also comprises a signal processing module, a control module, a power supply module and M liquid storage containers communicated with the micro-channels; a controller in the control module sends signals to the microstrip transmission line through the signal processing module and receives output signals of the microstrip transmission line; the utility model discloses a detection sensor can realize that nondestructive, contactless, the additive of liquid chemicals and no leak testing, and detection device can realize the witnessed inspections.
Description
(I) the technical field
The utility model relates to a liquid chemical check out test set, in particular to liquid chemical detection sensor and detection device.
(II) background of the invention
Liquid chemicals are widely used in industrial production and experimental fields, however, identification and classification of various liquid chemicals is a considerable challenge facing the industrial and academic industries, which provides great opportunities for development of chemical detection technology. In some cases, especially when measuring toxic, volatile, flammable chemicals, there is a risk of explosion, burning and poisoning during the measurement. Therefore, it is of great importance to explore simple, stable, safe and miniaturized measurement techniques to reduce the risk of accidents. Currently, known methods for detecting liquid chemicals include ultraviolet absorption spectroscopy, fluorescence spectroscopy, infrared absorption spectroscopy, raman spectroscopy, and the like. These methods have the disadvantages of expensive detection equipment, inability to be portable, complex sample pre-processing steps, the need for added fluorescent agents, and the necessity for exposure to air. For example, in the patent "detecting chemicals in water environment" (patent number: CN2010800634384), the detection of samples requires complicated pretreatment steps, resulting in long detection time.
(III) contents of the utility model
The to-be-solved technical problem of the utility model is: the liquid chemical detection sensor is compact in structure, small in size and low in cost, can realize nondestructive, non-contact, additive-free and leakage-free detection of liquid chemicals, and is high in detection precision and high in speed, and field detection can be realized.
The technical scheme of the utility model:
a liquid chemical detection sensor comprises a substrate, wherein a microstrip transmission line and N open resonators are arranged on the upper surface of the substrate, the N open resonators are arranged on one side or two sides of the microstrip transmission line, M bent micro-channels are embedded in the substrate, the M micro-channels are positioned below the microstrip transmission line and/or the open resonators, the inlet and the outlet of each micro-channel are arranged on the upper surface of the substrate, a bottom electrode layer is arranged on the lower surface of the substrate, and N and M are natural numbers which are more than or equal to 1.
N is an even number, N open resonators form N/2 open resonator pairs, and two open resonators in each open resonator pair are symmetrically arranged on two sides of the microstrip transmission line; and M is N/2, and M micro channels are respectively positioned right below the N/2 split resonator pairs. According to the electromagnetic distribution condition obtained by analyzing the finite element simulation software of the split resonator, the field intensity of the split resonator at the opening is strongest, so that the micro-channel is led to be right below the split resonator, and the sensitivity of the sensor is favorably improved.
the substrate is cuboid; the split resonator is a square split resonance ring or a circular split resonance ring, the shapes are convenient to process and electromagnetic induction, and the processing mode of the split resonator can adopt a standard circuit board processing technology, screen printing or conductive ink printing; the bending shape of the micro-channel is bow-shaped bending, or zigzag bending, or III-shaped bending, or I-shaped bending, and the shapes can increase the length or the cross-sectional area of the micro-channel, thereby increasing the volume of liquid chemicals introduced into the micro-channel, increasing the change amount of resonance of the sensor, and improving the sensitivity of the sensor.
the material of the substrate is epoxy resin (FR-4), or PTFE glass fiber, or PTFE ceramic, or hydrocarbon ceramic; the microstrip transmission line, the split resonator and the bottom electrode layer are made of gold, silver, copper or titanium. The bottom electrode layer is used for assisting the microstrip transmission line to excite quasi-TEM waves.
The micro-channel is used for feeding the liquid chemical to be detected into the sensor according to a specific path. The micro flow channel is processed by laser cutting or wire-controlled machine tool cutting.
the detection device comprises the liquid chemical detection sensor, a signal processing module, a control module, a power supply module and M liquid storage containers; the power supply module supplies power to the signal processing module and the control module; the control module comprises a controller, the signal processing module comprises an electromagnetic microwave transmitting circuit and an electromagnetic microwave receiving circuit, the digital input end of the electromagnetic microwave transmitting circuit is connected with the digital output end of the controller, the electromagnetic microwave output end of the electromagnetic microwave transmitting circuit is connected with the input end of the microstrip transmission line, the electromagnetic microwave input end of the electromagnetic microwave receiving circuit is connected with the output end of the microstrip transmission line, and the digital output end of the electromagnetic microwave receiving circuit is connected with the digital input end of the controller; the bottom electrode layer is connected with the ground of the signal processing module; m stock solution containers communicate with M microchannel respectively, and M stock solution container's export communicates with M microchannel's entry respectively through M export pipeline, and M stock solution container's entry communicates with M microchannel's export respectively through M entry pipeline.
The detection device also comprises M driving pumps which are respectively connected in series with the M outlet pipelines or the M inlet pipelines; and M liquid pumping control ends of the controller are respectively connected with the switch ends of the M driving pumps. The driving pump can accelerate and assist the liquid chemical to be measured to flow into the micro-channel, and the measuring speed is accelerated.
the electromagnetic microwave transmitting circuit comprises a digital-to-analog converter, a second matching resistor, a second matching capacitor, a signal generator, a first band-pass filter, a first matching capacitor and a first matching resistor, wherein the digital output end of the controller is connected with the input end of the digital-to-analog converter, the output end of the digital-to-analog converter is connected with the first end of the second matching resistor, the second end of the second matching resistor is connected with the input end of the signal generator, the second end of the second matching resistor is grounded through the second matching capacitor, the output end of the signal generator is connected with the input end of the first band-pass filter, the output end of the first band-pass filter is connected with the first end of the first matching resistor, the output end of the first band-pass filter is grounded through the first matching capacitor, and the second end of the first matching resistor is connected with the input end of;
The electromagnetic microwave receiving circuit comprises a third matching resistor, a third matching capacitor, a second band-pass filter, a signal receiver, a fourth matching capacitor, a fourth matching resistor and an analog-to-digital converter, wherein the output end of a microstrip transmission line is connected with the first end of the third matching resistor, the second end of the third matching resistor is connected with the input end of the second band-pass filter, the second end of the third matching resistor is grounded through the third matching capacitor, the output end of the second band-pass filter is connected with the input end of the signal receiver, the output end of the signal receiver is connected with the first end of the fourth matching resistor, the output end of the signal receiver is grounded through the fourth matching capacitor, the second end of the fourth matching resistor is connected with the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is connected with the;
the power module comprises a direct current power supply and a diode, the positive end of the direct current power supply is connected with the power supply ends of the electromagnetic microwave transmitting circuit, the electromagnetic microwave receiving circuit and the controller through the diode in forward connection, and the negative end of the direct current power supply is grounded. The diode is used for preventing the direct current power supply from being connected reversely or preventing the alternating current signal of the signal processing module from being reversely rushed to damage the direct current power supply.
the model of the digital-to-analog converter is: DA 9220; the analog-to-digital converter has the following model: AD 9772; the signal generator is of the following types: ADF 4350; the signal receiver is of the type: MAX7033 (super heterodyne receiver chip); the first band-pass filter is of the type: MAX 274; the second band-pass filter is of the type: an LTC 1562; the model of the controller is as follows: STM32 (single chip microcomputer); the direct current power supply is a lithium battery (3.7V); the liquid storage container is a test tube or a glass vessel; the drive pump is a peristaltic pump.
The resistance values of the first matching resistor, the second matching resistor, the third matching resistor and the fourth matching resistor are 50 ohms; the capacitance values of the first matching capacitor, the second matching capacitor, the third matching capacitor and the fourth matching capacitor are 104 picocoulombs; the filtering ranges of the first band-pass filter and the second band-pass filter are 6 GHz-8.5 GHz; the working range of the signal generator and the signal receiver is 6 GHz-8.5 GHz.
The microstrip transmission line has the function of enabling electromagnetic microwaves to smoothly pass through, and the width and the thickness of the microstrip transmission line are adjusted to enable the impedance of the microwaves transmitted in the microstrip transmission line to be 50 ohms so as to realize impedance matching with a subsequent signal processing module and ensure smooth passing of the electromagnetic microwaves. The open resonator is a sensitive element of the sensor, and the function of the open resonator is to couple with the microstrip transmission line, so as to generate electromagnetic resonance in an electromagnetic field around the microstrip transmission line and provide resonance information required by detection. The function of the micro-channel is to make the liquid chemical sample to be detected flow through the lower part of the split resonator according to the path of the micro-channel, so as to be detected by the split resonator.
Electromagnetic microwave signals transmitted on the microstrip transmission line generate an alternating electromagnetic field around the microstrip transmission line and generate electromagnetic resonance with the open resonator, after a liquid chemical sample to be detected is introduced into a micro channel in the substrate, the dielectric constant around the microstrip transmission line is influenced by the liquid chemical sample to be detected to change, so that the resonance of the sensor is changed, the resonance change condition is obtained by receiving analog signals at the output end of the microstrip transmission line, the dielectric constant of the liquid chemical sample to be detected can be calculated, and the type and the concentration of the liquid chemical sample to be detected are determined.
The electromagnetic microwave transmitting circuit transmits electromagnetic microwaves to the microstrip transmission line, the electromagnetic microwave receiving circuit receives electromagnetic microwave signals in the microstrip transmission line after the resonance state is changed, resonance information is extracted and converted into digital signals which can be identified by the controller, the controller performs data matching after obtaining the digital signals, and information such as types, concentrations and the like of chemicals can be obtained after successful matching.
The utility model has the advantages that:
1, the utility model discloses a liquid chemical detection sensor arranges microstrip transmission line, opening syntonizer, microchannel and bottom electrode layer on a basement, compact structure, small, portable; the volume of the detection sensor is small, and the processing mode can adopt the processes of conventional circuit board processing and the like, so that the detection sensor is low in cost and can be produced in large batch.
2, the utility model discloses a liquid chemical detection sensor lets in the liquid chemical that awaits measuring in the inside confined microchannel of basement, is difficult for taking place dangerous condition such as leakage, evaporation, safe in utilization, and the detection that is particularly useful for dangerous liquid chemical, this detection sensor can realize that liquid chemical (for example: methanol, ethanol, benzene, acetone, acetic acid, butanol and glycerine etc.) quick, harmless, contactless, no additive, no leakage and low-cost detect, provide effectual detection method for the transportation, production and the appraisal process of industrial chemical.
3, the utility model discloses signal processing module among the detection device can accurately convey electromagnetic microwave signal to the microstrip transmission line through setting up the matching circuit to can extract electromagnetic microwave signal from the microstrip transmission line effectively, filter interfering signal through band pass filter, prepare for follow-up signal processing, signal processing module can also convert electromagnetic microwave signal into digital signal and send to the controller, the controller realizes the detection to the liquid chemical in a plurality of microchannels after carrying out analysis processes to the signal received; the utility model discloses detection device's detection precision is high, fast, can realize the witnessed inspections.
(IV) description of the drawings
FIG. 1 is a schematic diagram of a liquid chemical detection sensor;
FIG. 2 is a schematic sectional view A-A of FIG. 1;
FIG. 3 is a schematic bottom view of the structure of FIG. 1;
FIG. 4 is a schematic sectional view of the structure of B-B in FIG. 3;
FIG. 5 is one of the schematic structural diagrams of a split resonator;
FIG. 6 is a second schematic structural diagram of a split resonator;
FIG. 7 is a third schematic structural diagram of a split resonator;
FIG. 8 is a fourth schematic diagram of the structure of the split resonator;
FIG. 9 is a fifth schematic diagram of a split resonator;
FIG. 10 is a sixth schematic diagram of the structure of the split resonator;
FIG. 11 is a schematic view of a micro flow channel;
FIG. 12 is a second schematic view of the structure of the micro flow channel;
FIG. 13 is a third schematic view of the structure of a micro flow channel;
FIG. 14 is a schematic circuit diagram of the detection device;
FIG. 15 is a partial schematic view of a composite dielectric constant database;
FIG. 16 is a schematic diagram of the electromagnetic microwave signals received by the controller when the sample A and the sample B flow into the first microchannel and the second microchannel, respectively;
FIG. 17 is a schematic diagram of the electromagnetic microwave signals received by the controller when the sample A and the sample B flow into the second microchannel and the first microchannel, respectively;
Fig. 18 is an information graph of the complex permittivity of sample a and the complex permittivity of sample B calculated by the controller.
(V) detailed description of the preferred embodiments
Referring to fig. 1 to 18, in the figures, the liquid chemical detection sensor includes a substrate 1, a microstrip transmission line 3 and 4 open resonators 2 are provided on an upper surface of the substrate 1, the 4 open resonators 2 are disposed on both sides of the microstrip transmission line 3, 2 bent microchannels 4 are embedded in the substrate 1, the 2 microchannels 4 are located below the microstrip transmission line 3 and the open resonators 2, an inlet 5 and an outlet 6 of each microchannel 4 are both provided on the upper surface of the substrate 1, and a bottom electrode layer 7 is provided on a lower surface of the substrate 1.
The 4 split resonators 2 form 2 split resonator pairs, and two split resonators 2 in each split resonator pair are symmetrically arranged on two sides of the microstrip transmission line 3; the 2 micro channels 4 are respectively positioned right below the 2 split resonator pairs. According to the electromagnetic distribution obtained by analyzing the finite element simulation software of the split resonator 2, the field intensity of the split resonator 2 at the opening is strongest, so that the micro-channel 4 is led to be right below the split resonator 2, and the sensitivity of the sensor is favorably improved. The 2 split resonator pairs have different sizes, so that different resonance channels can be obtained, and multi-channel detection is realized.
The substrate 1 is cuboid; the split resonator 2 is a circular split ring resonator, the split resonator 2 consists of an inner concentric circular split ring and an outer concentric circular split ring, and the split positions of the two circular split rings are opposite to each other; for the larger split resonator 2, the widths of the split openings of the two round split rings are both 0.2mm, the widths of the two round split rings are both 0.2mm, the distance between the two round split rings is 0.2mm, and the average radius of the two round split rings is 1.03 mm; for the smaller split resonator 2, the widths of the split of the two circular split rings are both 0.18mm, the widths of the split rings are both 0.18mm, the distance between the two circular split rings is 0.18mm, and the average radius of the split rings is 0.8 mm. The split resonator 2 can also adopt other forms of square split resonance rings (2-1, 2-3, 2-4 and 2-6) and circular split resonance rings (2-2 and 2-5), the shapes are convenient to process and electromagnetic induction, and the processing mode of the split resonator 2 adopts a standard circuit board processing technology.
the bending shape of the micro-channel 4 is bow-shaped bending, and can also be zigzag bending 4-1, III-shaped bending 4-2, or I-shaped bending 4-3, and the shapes can increase the length or cross section area of the micro-channel 4, thereby increasing the volume of liquid chemicals introduced into the micro-channel 4, increasing the variation of sensor resonance and improving the sensitivity of the sensor.
The material of the substrate 1 is epoxy resin (FR-4); the microstrip transmission line 3, the split resonator 2 and the bottom electrode layer 7 are made of copper. The bottom electrode layer 7 is a copper film, and the bottom electrode layer 7 is used for assisting the micro-strip transmission line 3 to excite quasi-TEM waves.
the micro flow channel 4 is used for feeding the liquid chemical to be measured into the sensor according to a specific path. The micro flow channel 4 is processed by laser cutting.
The detection device comprising the liquid chemical detection sensor also comprises a signal processing module III, a control module II, a power supply module I and 2 liquid storage containers; the power supply module I supplies power to the signal processing module III and the control module II; the control module II comprises a controller U1, the signal processing module III comprises an electromagnetic microwave transmitting circuit and an electromagnetic microwave receiving circuit, the digital input end of the electromagnetic microwave transmitting circuit is connected with the digital output end a1 of the controller U1, the electromagnetic microwave output end of the electromagnetic microwave transmitting circuit is connected with the input end of the microstrip transmission line 3, the electromagnetic microwave input end of the electromagnetic microwave receiving circuit is connected with the output end of the microstrip transmission line 3, and the digital output end of the electromagnetic microwave receiving circuit is connected with the digital input end a4 of the controller U1; the bottom electrode layer 7 is connected to the ground GND of the signal processing module; 2 stock solution containers communicate with 2 miniflow channels 4 respectively, 2 stock solution container's export respectively with 2 miniflow channels 4 entry 5 intercommunications through 2 export pipelines, 2 stock solution container's entry respectively with 2 miniflow channels 4 export 6 intercommunications through 2 entry pipelines. 2 stock solution containers are first stock solution container and second stock solution container respectively, and 2 microchannel 4 are first microchannel and second microchannel respectively.
the detection device also comprises 2 driving pumps: the driving pump comprises a first driving pump and a second driving pump, wherein 2 driving pumps are respectively connected to 2 outlet pipelines in series; 2 liquid pumping control ends (a5, a6) of the controller U1 are respectively connected with switch ends of 2 driving pumps. The driving pump can accelerate and assist the liquid chemical to be measured to flow into the micro-channel 4, and the measuring speed is accelerated.
the electromagnetic microwave transmitting circuit comprises a digital-to-analog converter H1, a second matching resistor R2, a second matching capacitor C2, a signal generator E1, a first band-pass filter F1, a first matching capacitor C1 and a first matching resistor R1, a digital output end a1 of the controller U1 is connected with an input end of a digital-to-analog converter H1, an output end of the digital-to-analog converter H1 is connected with a first end of a second matching resistor R2, a second end of the second matching resistor R2 is connected with an input end of a signal generator E1, a second end of the second matching resistor R2 is further connected to the GND through a second matching capacitor C2, an output end of the signal generator E1 is connected with an input end of a first band-pass filter F1, an output end of the first band-pass filter F1 is connected with a first end of the first matching resistor R1, an output end of the first band-pass filter F1 is further connected to the ground through a first matching capacitor C1, and a second end of the first matching resistor R1 is connected with an input end of the microstrip;
The electromagnetic microwave receiving circuit comprises a third matching resistor R3, a third matching capacitor C3, a second band-pass filter F2, a signal receiver E2, a fourth matching capacitor C4, a fourth matching resistor R4 and an analog-to-digital converter H2, the output end of the microstrip transmission line 3 is connected with the first end of a third matching resistor R3, the second end of a third matching resistor R3 is connected with the input end of a second band-pass filter F2, the second end of the third matching resistor R3 is also grounded GND through a third matching capacitor C3, the output end of a second band-pass filter F2 is connected with the input end of a signal receiver E2, the output end of the signal receiver E2 is connected with the first end of a fourth matching resistor R4, the output end of the signal receiver E2 is also grounded GND through a fourth matching capacitor C4, the second end of a fourth matching resistor R4 is connected with the input end of an analog-to-digital converter H2, and the output end of an analog-to-digital converter H2 is connected with the digital input end a4 of a controller U1;
The power module comprises a direct current power supply P and a diode D, the positive end of the direct current power supply P is connected with power supply ends of the electromagnetic microwave transmitting circuit, the electromagnetic microwave receiving circuit and the controller U1 through the diode D in forward connection, and the negative end of the direct current power supply P is grounded. The diode D is used to prevent the dc power supply P from being damaged by reverse connection or reverse surge of the ac signal of the signal processing module.
the model number of the digital-to-analog converter H1 is: DA 9220; the analog-to-digital converter H2 has the model number: AD 9772; the signal generator E1 is of the type: ADF 4350; the signal receiver E2 has the model: MAX7033 (super heterodyne receiver chip); the first band pass filter F1 is of the type: MAX 274; the second band-pass filter F2 is of the type: an LTC 1562; the model of the controller U1 is: STM32 (single chip microcomputer); the direct current power supply P is a lithium battery (3.7V); the liquid storage container is a glass vessel; the drive pump is a peristaltic pump.
the resistance values of the first matching resistor R1, the second matching resistor R2, the third matching resistor R3 and the fourth matching resistor R4 are 50 ohms; the capacitance values of the first matching capacitor C1, the second matching capacitor C2, the third matching capacitor C3 and the fourth matching capacitor C4 are 104 picocoulombs; the filtering range of the first band-pass filter F1 and the second band-pass filter F2 is 6 GHz-8.5 GHz; the working range of the signal generator E1 and the signal receiver E2 is 6 GHz-8.5 GHz.
The microstrip transmission line 3 has the function of enabling electromagnetic microwaves to smoothly pass through, and the width and the thickness of the microstrip transmission line 3 are adjusted to enable the impedance of the microwaves transmitted in the microstrip transmission line to be 50 ohms so as to realize impedance matching with a subsequent signal processing module and ensure smooth passing of the electromagnetic microwaves. The split resonator 2 is a sensitive element of the sensor, and functions to couple with the microstrip transmission line 3, so as to generate electromagnetic resonance in an electromagnetic field around the microstrip transmission line 3, and provide resonance information required for detection. The function of the micro flow channel 4 is to make the liquid chemical sample to be measured flow through the lower part of the split resonator 2 according to the path of the micro flow channel 4, thereby being detected by the split resonator 2.
the electromagnetic microwave signal transmitted on the microstrip transmission line 3 generates an alternating electromagnetic field around the microstrip transmission line 3, and generates electromagnetic resonance with the open resonator 2, after the liquid chemical sample to be detected is introduced into the micro channel 4 in the substrate 1, the dielectric constant around the microstrip transmission line 3 is influenced by the liquid chemical sample to be detected and can be changed, so that the resonance of the sensor is changed, the resonance change condition is obtained by receiving the analog signal at the output end of the microstrip transmission line 3, the dielectric constant of the liquid chemical sample to be detected can be calculated, and the type and the concentration of the liquid chemical sample to be detected are determined.
The electromagnetic microwave transmitting circuit transmits electromagnetic microwaves to the microstrip transmission line 3, the electromagnetic microwave receiving circuit receives electromagnetic microwave signals in the microstrip transmission line 3 after the resonance state is changed, resonance information is extracted and converted into digital signals capable of being recognized by the controller, the controller U1 performs data matching after obtaining the digital signals, and information such as types and concentrations of chemicals can be obtained after successful matching.
the detection method of the detection device comprises the following steps: (sufficient preparation is required before the detection is started, for example, a sample is put into a liquid storage container, a driving pump is connected, and whether the electrical connection of the device is connected or not is checked.)
Step 1, adding a sample A and a sample B into a first liquid storage container and a second liquid storage container respectively, wherein the sample A and the sample B flow into a first micro-channel and a second micro-channel respectively;
Step 2, after the controller U1 outputs an original electromagnetic microwave signal to the input end of the microstrip transmission line 3 through the electromagnetic microwave transmitting circuit, the electromagnetic microwave signal output from the output end of the microstrip transmission line 3 is received through the electromagnetic microwave receiving circuit, and then the controller U1 extracts resonance information of the electromagnetic microwave signal, wherein the resonance information contains a first resonance frequency X1 and a first quality factor Y1;
Step 3, washing the first liquid storage container, the second liquid storage container, the first micro-flow channel and the second micro-flow channel as well as an outlet pipeline and an inlet pipeline connected between the first liquid storage container and the second micro-flow channel by using deionized water, then respectively adding the sample A and the sample B into the second liquid storage container and the first liquid storage container, and respectively enabling the sample A and the sample B to flow into the second micro-flow channel and the first micro-flow channel;
Step 4, after the controller U1 outputs an original electromagnetic microwave signal to the input end of the microstrip transmission line 3 through the electromagnetic microwave transmitting circuit, the electromagnetic microwave signal output from the output end of the microstrip transmission line 3 is received through the electromagnetic microwave receiving circuit, and then the controller U1 extracts resonance information of the electromagnetic microwave signal, wherein the resonance information contains a second resonance frequency X2 and a second quality factor Y2;
Step 5, calculating the composite dielectric constant of the sample A and the composite dielectric constant of the sample B by the controller U1 according to the first resonant frequency X1, the first quality factor Y1, the second resonant frequency X2 and the second quality factor Y2:
Z'＝-5.2943X+0.0232X-3.0205X+0.8395Y-0.1439Y-0.0065Y
Z"＝-2.1203X+0.0087X-1.1348X+68.0887Y-1.6665Y-0.0007Y
Z'＝-0.02400X+0.000453X-0.0000011X+-0.49010Y-14.93790Y-0.020Y
Z"＝-4.48272X+0.02303X-0.0000364X+5.87300Y-0.12846Y--0.002624Y
wherein ZA 'and ZA "are the real and imaginary parts, respectively, of the complex permittivity of sample A, and ZB' and ZB" are the real and imaginary parts, respectively, of the complex permittivity of sample B;
The composite dielectric constant can be expressed as: ε '+ j ε ", where ε' is the real part of the complex permittivity and ε" is the imaginary part of the complex permittivity.
And 6, matching the composite dielectric constant of the sample A and the composite dielectric constant of the sample B with a composite dielectric constant database (which is recorded in advance by people) in an internal storage unit of the controller by the controller U1 to obtain the type and concentration data of the sample A and the sample B.
In step 2 and step 4, the software adopted when the controller U1 extracts the resonance information of the electromagnetic microwave signal is: network analysis software, version number: a.09.10, design unit: is German technology (China) Inc. (Keysight).
the detection method can also introduce a reference sample, and correct and compensate the error of the detection device by performing a comparison test with the reference sample.
Claims (8)
1. A liquid chemical detection sensor is characterized in that: the micro-strip antenna comprises a substrate, wherein a micro-strip transmission line and N open resonators are arranged on the upper surface of the substrate, the N open resonators are arranged on one side or two sides of the micro-strip transmission line, M bent micro-channels are embedded in the substrate, the M micro-channels are positioned below the micro-strip transmission line and/or the open resonators, an inlet and an outlet of each micro-channel are arranged on the upper surface of the substrate, a bottom electrode layer is arranged on the lower surface of the substrate, and N and M are natural numbers which are more than or equal to 1.
2. a liquid chemical detection sensor according to claim 1, wherein: n is an even number, N open resonator pairs form N/2 open resonator pairs, and two open resonators in each open resonator pair are symmetrically arranged on two sides of the microstrip transmission line; m = N/2, M micro channels are respectively positioned right below the N/2 split resonator pairs.
3. A liquid chemical detection sensor according to claim 1, wherein: the substrate is cuboid; the split resonator is a square split resonance ring or a circular split resonance ring; the micro flow channel is bent into an arc shape, or bent into a square shape, or bent into a III shape, or bent into an I shape.
4. a liquid chemical detection sensor according to claim 1, wherein: the substrate is made of epoxy resin, or PTFE glass fiber, or PTFE ceramic, or hydrocarbon ceramic; the microstrip transmission line, the split resonator and the bottom electrode layer are made of gold, silver, copper or titanium.
5. A liquid chemical detection sensor according to any one of claims 1 to 4, wherein: the device also comprises a signal processing module, a control module, a power supply module and M liquid storage containers; the power supply module supplies power to the signal processing module and the control module; the control module comprises a controller, the signal processing module comprises an electromagnetic microwave transmitting circuit and an electromagnetic microwave receiving circuit, the digital input end of the electromagnetic microwave transmitting circuit is connected with the digital output end of the controller, the electromagnetic microwave output end of the electromagnetic microwave transmitting circuit is connected with the input end of the microstrip transmission line, the electromagnetic microwave input end of the electromagnetic microwave receiving circuit is connected with the output end of the microstrip transmission line, and the digital output end of the electromagnetic microwave receiving circuit is connected with the digital input end of the controller; the bottom electrode layer is connected with the ground of the signal processing module; m stock solution containers communicate with M microchannel respectively, and M stock solution container's export communicates with M microchannel's entry respectively through M export pipeline, and M stock solution container's entry communicates with M microchannel's export respectively through M entry pipeline.
6. The inspection device of claim 5, wherein: the device also comprises M driving pumps which are respectively connected in series with the M outlet pipelines or the M inlet pipelines; and M liquid pumping control ends of the controller are respectively connected with the switch ends of the M driving pumps.
7. the inspection device of claim 6, wherein: the electromagnetic microwave transmitting circuit comprises a digital-to-analog converter, a second matching resistor, a second matching capacitor, a signal generator, a first band-pass filter, a first matching capacitor and a first matching resistor, wherein the digital output end of the controller is connected with the input end of the digital-to-analog converter, the output end of the digital-to-analog converter is connected with the first end of the second matching resistor, the second end of the second matching resistor is connected with the input end of the signal generator, the second end of the second matching resistor is grounded through the second matching capacitor, the output end of the signal generator is connected with the input end of the first band-pass filter, the output end of the first band-pass filter is connected with the first end of the first matching resistor, the output end of the first band-pass filter is grounded through the first matching capacitor, and the second end of the first matching resistor is connected with the input end of the;
The electromagnetic microwave receiving circuit comprises a third matching resistor, a third matching capacitor, a second band-pass filter, a signal receiver, a fourth matching capacitor, a fourth matching resistor and an analog-to-digital converter, wherein the output end of a microstrip transmission line is connected with the first end of the third matching resistor, the second end of the third matching resistor is connected with the input end of the second band-pass filter, the second end of the third matching resistor is grounded through the third matching capacitor, the output end of the second band-pass filter is connected with the input end of the signal receiver, the output end of the signal receiver is connected with the first end of the fourth matching resistor, the output end of the signal receiver is grounded through the fourth matching capacitor, the second end of the fourth matching resistor is connected with the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is connected with the;
the power module comprises a direct current power supply and a diode, the positive end of the direct current power supply is connected with the power supply ends of the electromagnetic microwave transmitting circuit, the electromagnetic microwave receiving circuit and the controller through the diode in forward connection, and the negative end of the direct current power supply is grounded.
8. The inspection device of claim 7, wherein: the model of the digital-to-analog converter is as follows: DA 9220; the analog-to-digital converter has the following model: AD 9772; the signal generator is of the following types: ADF 4350; the signal receiver is of the type: MAX 7033; the first band-pass filter is of the type: MAX 274; the second band-pass filter is of the type: an LTC 1562; the model of the controller is as follows: STM 32; the direct current power supply is a lithium battery; the liquid storage container is a test tube or a glass vessel; the drive pump is a peristaltic pump.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916925A (en) * | 2019-04-09 | 2019-06-21 | 重庆大学 | Liquid chemicals detection sensor, detection device and its detection method |
| CN113218967A (en) * | 2021-05-26 | 2021-08-06 | 江南大学 | Uric acid microwave biosensor based on RFID concept and application thereof |
| RU2761954C1 (en) * | 2021-02-17 | 2021-12-14 | Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук | Method for measuring the physical properties of a dielectric liquid |
| RU2762058C1 (en) * | 2021-02-17 | 2021-12-15 | Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук | Device for measuring the physical properties of a dielectric liquid |
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2019
- 2019-04-09 CN CN201920467634.6U patent/CN209745845U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916925A (en) * | 2019-04-09 | 2019-06-21 | 重庆大学 | Liquid chemicals detection sensor, detection device and its detection method |
| CN109916925B (en) * | 2019-04-09 | 2024-04-26 | 重庆大学 | Liquid chemical detection sensor, detection device and detection method thereof |
| RU2761954C1 (en) * | 2021-02-17 | 2021-12-14 | Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук | Method for measuring the physical properties of a dielectric liquid |
| RU2762058C1 (en) * | 2021-02-17 | 2021-12-15 | Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук | Device for measuring the physical properties of a dielectric liquid |
| CN113218967A (en) * | 2021-05-26 | 2021-08-06 | 江南大学 | Uric acid microwave biosensor based on RFID concept and application thereof |
| CN113218967B (en) * | 2021-05-26 | 2022-04-22 | 江南大学 | Uric acid microwave biosensor based on RFID concept and application thereof |
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