CN210953920U - Vibration detection sensor for liquid detection based on vibration principle - Google Patents
Vibration detection sensor for liquid detection based on vibration principle Download PDFInfo
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- CN210953920U CN210953920U CN201921777721.8U CN201921777721U CN210953920U CN 210953920 U CN210953920 U CN 210953920U CN 201921777721 U CN201921777721 U CN 201921777721U CN 210953920 U CN210953920 U CN 210953920U
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Abstract
The utility model relates to the field of biological medical treatment and sensor technology, and discloses a vibration detection sensor for liquid detection based on the vibration principle, which comprises a columnar insulator, at least two metal conductors with different heights arranged on the surface of the columnar insulator, and pins arranged on the columnar insulator and used for being connected with the metal conductors; the metal conductors with different heights are not connected with each other; the pins are respectively connected with the metal conductors with different heights. The vibration detection sensor is provided with metal conductors with different heights and utilizes the conductivity of liquid; the liquid of vibration forms conductive path between the metal conductor of co-altitude not when taking place the resonance, through pin and detection circuitry switch-on, detects the signal of different metal conductor's output, and then reflects the change of liquid resonance amplitude to and resonant frequency's change, with the change process of mastering liquid physicochemical property, this vibration detection sensor is more sensitive, and the testing result is more accurate.
Description
Technical Field
The utility model relates to a biomedical field and sensor technology, concretely relates to liquid detects uses vibration detection sensor based on vibration principle.
Background
Resonance is also known as "resonance". The oscillation system has the phenomenon that under the action of periodic external force, when the frequency of the external force action is the same as or very close to the natural oscillation frequency of the system, the amplitude sharply increases.
Any liquid has its specific electrical resonance frequency, and the electrical resonance frequency is related to the properties of the liquid itself. When any property of the liquid (e.g., composition, conductivity, concentration, pH, density, viscosity, etc.) is changed, the electrical resonant frequency of the liquid is changed accordingly. Therefore, the change of the resonance frequency in the process of changing the physical and chemical properties of the liquid can be measured by utilizing the electrical resonance characteristic of the liquid, and the physical and chemical properties of the liquid and the like can be further known.
In the prior art (research on blood coagulation testing method based on liquid electric resonance principle, Zhouyakun, 2009.6.15), a liquid resonance measuring device is used to measure the electric resonance frequency of blood plasma, and a measuring system comprises a solution to be measured, a interdigital sensor, an oscillating circuit, precision frequency detectors such as SP312, USB data transmission, PC data display and corresponding upper computer software. The prior art (liquid resonance sensing method and system, CN102809597A) discloses that the properties of liquid viscoelasticity, density, components and concentration thereof can be characterized by the natural frequency of liquid, and under the action of an alternating excitation oscillation signal, liquid generates resonance, and when the properties of liquid change, the resonance frequency changes correspondingly. The disclosed sensing system consists of a gold-plated film interdigital microelectrode array resonant sensor, an excitation oscillator, a vibration pickup, a singlechip and a computer.
The interdigital sensor, the excitation oscillator, the vibration pickup, and the like used in the above-mentioned publications have problems of complicated structure, high manufacturing difficulty, low precision, poor repeatability, and the like.
Disclosure of Invention
In order to solve the deficiencies existing in the prior art, the utility model provides a liquid detects uses vibration detection sensor based on vibration principle.
The utility model discloses a realize through following technical scheme:
a vibration detection sensor for liquid detection based on the vibration principle comprises a columnar insulator, at least two metal conductors with different heights arranged on the surface of the columnar insulator, and pins arranged on the columnar insulator and used for being connected with the metal conductors; the metal conductors with different heights are not connected with each other; the pins are respectively connected with the metal conductors with different heights.
Further, different potential circuits are respectively connected between one of the metal conductors on the columnar insulator and the metal conductors with different heights.
Preferably, one of the metal conductors is connected with the high-level I/O port through a pin, and the rest metal conductors are scanned for a level state by the microcontroller; preferably, one of the metal conductors is connected to ground through a pin, and the remaining metal conductors are scanned for level states by the microcontroller.
Because the molecular gap between the liquid and the solid is different, the molecular gap in the liquid changes to a certain extent, and the natural frequency of the liquid has great influence. And because the liquid resonance only needs an external excitation with the same resonance frequency as the liquid resonance, the obvious vibration phenomenon can be generated.
The utility model discloses a vibration detection sensor has utilized the electric conductivity of liquid itself, and when taking place the resonance, the liquid of vibration forms the electrically conductive route between the metal conductor of co-altitude not, through pin and detection circuitry switch-on, detects the signal of different metal conductor's output, and then reflects liquid resonance amplitude, and resonant frequency's change to master the change process of liquid physicochemical property.
Further, the pins are arranged at the bottom of the columnar insulator; the distance between the pin and the adjacent metal conductor is larger than the thickness of the circuit board.
Furthermore, the metal conductors are arranged with a height of 2n (n is more than or equal to 1), the number of the pins is at least consistent with the height, and the pins are symmetrically arranged at two sides of the bottom of the columnar insulator.
Furthermore, the number of the metal conductors and the number of the pins are 2n, and the pins are symmetrically arranged on two sides of the bottom of the columnar insulator in a manner of n pins on each side.
Furthermore, the metal conductors are in a strip shape and are embedded into the columnar insulators in a surrounding mode, and the metal conductors are arranged in parallel at equal intervals.
Furthermore, a through hole is formed in the columnar insulator, and the metal conductor is connected with the pin through the through hole and the lead.
Furthermore, a small hole is formed in the columnar insulator, and a lead penetrates through the small hole to be connected with the metal conductor and the pin.
Further, the columnar insulator is cylindrical, and an insulating material is filled in the columnar insulator.
Furthermore, the columnar insulator and the metal conductor are made of materials which do not react with liquid.
The application of the vibration detection sensor for liquid detection based on the vibration principle is that the vibration detection sensor is matched with an excitation oscillator to detect the change of the physical and chemical properties of the liquid. And a detection area on the excitation oscillation circuit board is enclosed to form a sample pool, and a columnar insulator of the vibration detection sensor is matched with the through hole.
Furthermore, the front surface of the excitation oscillation circuit board is provided with at least 2 circuits which are arranged in the detection area in parallel and have the same current direction; the circuit board is provided with a via hole at the tail end of the front circuit and is connected with the circuit on the back; and a through hole matched with the vibration detection sensor is formed in the center of the detection area.
Further, the front side and the back side of the circuit board are coated with insulating materials; and filling and smearing an insulating material in the via hole.
Furthermore, a bonding pad is arranged in the edge area of the via hole matched with the vibration detection sensor, and the bonding pad is parallel to a circuit on the back side.
Further, the number of the pads corresponds to the number of pins of the vibration detection sensor.
Compared with the prior art, the utility model discloses following beneficial effect has:
the vibration detection sensor for liquid detection based on the vibration principle of the utility model has the innovative structural design, and utilizes the conductivity of the liquid by arranging the metal conductors with different heights; when resonance occurs, the vibrating liquid forms a conductive path between the metal conductors with different heights, and the conductive path is communicated with a detection circuit through pins to detect the output signals of different metal conductors, so that the resonance amplitude and the resonance frequency of the liquid are reflected, and the change process of the physical and chemical properties of the liquid is mastered. The utility model discloses a vibration detection sensor, simple structure easily makes, and precision is high, repeatability is good.
Drawings
FIG. 1 is a bottom view of a vibration detection sensor in an embodiment of the present invention;
FIG. 2 is a front view of a vibration detection sensor in an embodiment of the present invention;
fig. 3 is a cross-sectional view of a vibration detection sensor in an embodiment of the present invention;
fig. 4 is a diagram of an excited oscillation circuit according to an embodiment of the present invention;
fig. 5 is a back view of an excited oscillation circuit according to an embodiment of the present invention;
fig. 6 is a front view of an excited oscillation circuit according to an embodiment of the present invention.
Detailed Description
The following examples are given to specifically describe the present invention, but are not limited thereto. The raw materials used in the examples and application examples are all commercially available.
Example 1
A vibration detection sensor for liquid detection based on the vibration principle comprises a columnar insulator 302, 8 metal conductors 301 embedded in the surface of the columnar insulator 302, and pins 303 located at the bottom of the columnar insulator 302 and used for being connected with the metal conductors 301.
The metal conductors 301 horizontally surround the columnar insulator 302, and the metal conductors 301 are arranged in parallel and are not connected with each other; the pins 303 are connected to the metal conductors 301 in a one-to-one correspondence.
The bottom most metal conductor 301 on the post insulator 302 is connected to a high level I/O port via pin 303 and the remaining metal conductors are scanned for level states by the STM32F103RBT6 microcontroller. The STM32F103RBT6 microcontroller continuously reads the I/O port states corresponding to the upper 7 conductors of the vibration detector.
Because the molecular gap between the liquid and the solid is different, the molecular gap in the liquid changes to a certain extent, and the natural frequency of the liquid has great influence. And because the liquid resonance only needs an external excitation with the same resonance frequency as the liquid resonance, the obvious vibration phenomenon can be generated.
The vibration detection sensor utilizes the conductivity of liquid, when resonance occurs, the vibrating liquid forms a conductive path between the metal conductors 301 with different heights, and is communicated with a detection circuit through a pin 303 to detect signals output by different metal conductors, so that the resonance amplitude and the change of resonance frequency of the liquid are reflected, and the change process of the physical and chemical properties of the liquid is mastered.
The distance between the pins 303 and the bottommost metal conductor 301 on the post insulator 302 is greater than the thickness of the circuit board.
The metal conductors 301 on the upper portion of the columnar insulator 302 are arranged in parallel at equal intervals.
A via 305 is provided on the columnar insulator 302, and the metal conductor 301 is connected to the pin 303 through the via 305 and a wire.
Alternatively, the post insulator 302 is provided with a small hole 305 through which a wire is passed to connect the metal conductor 301 and the pin 303.
The post insulator 302 vias or holes are filled with an insulating material.
The columnar insulator 302 and the metal conductor 301 are made of a material that does not chemically react with the liquid.
The number of the metal conductors 301 and the pins 303 is 8, and the pins 303 are symmetrically arranged on two sides of the bottom of the columnar insulator 302 in a manner of 4 pins 303 on each side.
The application of a vibration detection sensor for liquid detection based on the vibration principle is that the vibration detection sensor is matched with an excitation oscillation circuit to detect the change of physical and chemical properties of liquid. A circular area 506 on the circuit board of the excitation oscillator circuit mounts a plastic transparent cylinder forming a sample cell, and the post insulator 302 of the vibration detection sensor mates with the via 502 of the circuit board.
The input of the excitation oscillation circuit is one end of a 50 omega resistor, and the other end of the resistor is connected with the output of the OPA847 high-bandwidth operational amplifier.
The front surface of the excitation oscillation circuit board is provided with 13 circuits which are arranged in parallel in a circular area 506 and have the same current direction; the circuit board is provided with a via hole 505 at the tail end of the front circuit and is connected with the circuit on the back; the center of the circular area 506 is provided with a via 502 that fits with the vibration detection sensor.
Coating insulating materials on the front side and the back side of the circuit board; the vias 502, 505 are filled and coated with an insulating material.
The edge area of the via 502 fitted with the vibration detecting sensor is provided with a pad 507, and the pad 507 is parallel to the circuit on the back side. The number of the pads 507 is the same as the number of the pins 303 of the vibration detection sensor.
The liquid detection device is also provided with a temperature control module; to control the temperature of the test environment of the liquid to be tested.
Since the AD9854 chip easily generates heat, a heat sink is provided on the AD9854 chip.
The sample cell is provided with a cover. After the liquid to be detected is injected into the sample cell, the plastic soft cover above the sample cell is closed, so that a relatively stable detection environment is provided for the liquid.
The liquid detection device is also provided with a temperature control module; to control the temperature of the test environment of the liquid to be tested.
Since the AD9854 chip easily generates heat, a heat sink is provided on the AD9854 chip.
The sample cell is provided with a cover. After the liquid to be detected is injected into the sample cell, the plastic soft cover above the sample cell is closed, so that a relatively stable detection environment is provided for the liquid.
Application example 1
The blood to be detected is placed in the sample cell, and after the blood is injected into the sample cell, the plastic soft cover above the sample cell is closed, so that a relatively stable detection environment is provided for the blood. The highest point of the blood to be detected should be level with the top of the second layer of insulation 1. If the blood vibrates, the state of one or more I/O ports of other 7I/Os can be changed from low level to high level due to the conductivity of the blood, and the STM32F103RBT6 microcontroller receives the state change signal of the I/O ports, which indicates that the frequency sent by the AD9854 type DDS chip controlled by the microcontroller is the resonant frequency of the blood.
The blood to be tested is injected into the sample cell and the detection system is turned on, commanding the STM32F103RBT6 microcontroller to continuously read the I/O port status corresponding to the upper 7 metal conductors 301 of the vibration detector. The STM32F103RBT6 microcontroller controls the AD9854 DDS chip to perform rapid frequency sweep by adding and subtracting variables, namely the excitation square wave frequency value when blood resonates, and sweep signals are amplified by OPA847 high-bandwidth operational amplifier and then transmitted to an excitation oscillation circuit through a resistor.
At this time, due to the action of the alternating magnetic field, the blood will resonate when the magnetic field emits the alternating magnetic field with the same natural frequency as the magnetic field. When the vibration detection sensor receives the blood oscillation signal, the STM32F103RBT6 microcontroller stops sweeping the frequency, and writes the variable value at the moment into the internal flash. And then controlling the AD9854 DDS chip to perform frequency sweeping again by the microcontroller at intervals of 2S STM32F103RBT6, stopping the frequency sweeping by the STM32F103RBT6 microcontroller when the sensor receives a blood vibration signal, comparing the variable with the variable in the previous 2S, if the difference value of the two is greater than the threshold set by the system, indicating that the blood is not coagulated, continuing the operations of frequency sweeping, data recording and data comparison by the microcontroller until the difference value of the variables separated by 2S is less than or equal to the threshold set by the system, and stopping the frequency sweeping by the system to indicate that the detection link is finished.
The larger the threshold value is, the more inaccurate the detection result is, and the smaller the threshold value is, the overfitting of data is caused, so the threshold value is important. After the detection is finished, the STM32F103RBT6 microcontroller extracts various data of healthy blood coagulation in the EEPROM and compares the data with the detection data. If the coagulation time of the detected blood is basically the same as that of the healthy blood, the detected blood is basically normal; if the blood coagulation time is far longer or far shorter than the healthy blood coagulation time, the blood coagulation process is abnormal. The inspector can also derive the detection data through the USB interface to carry out manual data analysis.
Claims (9)
1. A vibration detection sensor for liquid detection based on the vibration principle is characterized by comprising a columnar insulator, at least two metal conductors with different heights arranged on the surface of the columnar insulator, and pins arranged on the columnar insulator and used for being connected with the metal conductors; the metal conductors with different heights are not connected with each other; the pins are respectively connected with the metal conductors with different heights.
2. The vibration detecting sensor for liquid detection based on the vibration principle as claimed in claim 1, wherein different potential circuits are connected between a part of the metal conductors on the columnar insulator and the metal conductors having different heights, respectively.
3. The vibration detecting sensor for liquid detection based on the vibration principle as claimed in claim 1, wherein the pin is provided at a bottom of a columnar insulator; the distance between the pin and the adjacent metal conductor is larger than the thickness of the circuit board.
4. The vibration detecting sensor for liquid detection according to claim 3, wherein the number of the metal conductors is 2n, the number of the pins is at least equal to the number of the heights, and the pins are symmetrically arranged on both sides of the bottom of the columnar insulator.
5. The vibration detecting sensor for liquid detection according to claim 1, wherein the metal conductors are in a band shape, and are embedded around the columnar insulator, and the metal conductors are arranged in parallel at equal intervals.
6. The vibration detecting sensor for liquid detection according to claim 1, wherein the columnar insulator is provided with a via hole, and the metal conductor is connected to the pin through the via hole and a lead.
7. The vibration detecting sensor for liquid detection according to claim 1, wherein the columnar insulator has a small hole, and a lead wire is passed through the small hole to connect the metal conductor and the pin.
8. The vibration detecting sensor for liquid detection according to claim 1, wherein the columnar insulator has a cylindrical shape, and the via hole or the small hole thereof is filled with an insulating material.
9. The vibration detecting sensor for liquid detection according to claim 1, wherein the columnar insulator and the metal conductor are made of a material that does not chemically react with the liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921777721.8U CN210953920U (en) | 2019-10-22 | 2019-10-22 | Vibration detection sensor for liquid detection based on vibration principle |
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| CN201921777721.8U CN210953920U (en) | 2019-10-22 | 2019-10-22 | Vibration detection sensor for liquid detection based on vibration principle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113246126A (en) * | 2021-04-30 | 2021-08-13 | 上海擎朗智能科技有限公司 | Robot movement control method, robot movement control device and robot |
| CN114062177A (en) * | 2021-11-26 | 2022-02-18 | 黄河水利委员会黄河水利科学研究院 | Hydraulic structure runner concrete abrasion loss monitoring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113246126A (en) * | 2021-04-30 | 2021-08-13 | 上海擎朗智能科技有限公司 | Robot movement control method, robot movement control device and robot |
| CN114062177A (en) * | 2021-11-26 | 2022-02-18 | 黄河水利委员会黄河水利科学研究院 | Hydraulic structure runner concrete abrasion loss monitoring method |
| CN114062177B (en) * | 2021-11-26 | 2023-12-05 | 黄河水利委员会黄河水利科学研究院 | Hydraulic building runner concrete erosion loss monitoring method |
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