CN213067827U

CN213067827U - Radar level gauge for open channel measurement

Info

Publication number: CN213067827U
Application number: CN202021889220.1U
Authority: CN
Inventors: 张元振; 陈永娟; 乔杰华; 张汝亮
Original assignee: Shandong Oubiao Information Technology Co ltd
Current assignee: Shandong Oubiao Information Technology Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2021-04-27
Anticipated expiration: 2030-09-02

Abstract

The utility model provides a radar level gauge for open channel measurement, includes measuring unit, microprocessing unit and communication circuit, its characterized in that, the measuring unit includes radar agility transceiver chip AD9361 and transceiver antenna, the microprocessing unit includes microprocessing chip ATMEGA328P, radar agility transceiver chip AD9361, power conversion circuit and communication circuit are connected respectively to microprocessing chip ATMEGA328P, power conversion circuit is connected with radar agility transceiver chip AD9361 and communication circuit respectively, power conversion circuit includes lithium cell and switching voltage regulation chip LM2596, communication circuit includes NB _ IOT teletransmission communication circuit. The liquid level meter adopting the non-contact measurement technology can be stably and reliably applied to continuous liquid level measurement in various open tanks, and is less influenced by water quality.

Description

Radar level gauge for open channel measurement

Technical Field

The utility model relates to an open channel liquid level measurement application technology field, concretely relates to accurate, be used for open channel measuring radar level gauge.

Background

Currently, most of the open channel measuring liquid level meters in the market are based on contact type, such as capacitance type liquid level meters, variable buoyancy type liquid level meters and the like, and the measuring accuracy and the service life of the liquid level meters are generally influenced by water quality, particularly corrosive sewage.

How to realize contactless liquid level measurement and have higher measurement accuracy is a problem which is urgently needed to be solved at present.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a radar level gauge for open channel is measured, radar agility transceiver chip AD9361 can send microwave signal through receiving and dispatching antenna, and the microwave signal that returns through the liquid level reflection is received, handles and calculates by micro-processing chip ATMEGA328P through radar agility transceiver chip AD9361 and reachs the liquid level height. The liquid level meter adopting the non-contact measurement technology can be stably and reliably applied to continuous liquid level measurement in various open tanks, and is less influenced by water quality.

The technical scheme of the utility model as follows:

the utility model provides a radar level gauge for open channel measurement, includes measuring unit, microprocessing unit and communication circuit, the measuring unit includes radar agility transceiver chip AD9361 and receiving and dispatching antenna, the microprocessing unit includes microprocessing chip ATMEGA328P, radar agility transceiver chip AD9361, power conversion circuit and communication circuit are connected respectively to microprocessing chip ATMEGA328P, power conversion circuit is connected with radar agility transceiver chip AD9361 and communication circuit respectively, power conversion circuit includes lithium cell and switching voltage regulation chip LM2596, communication circuit includes NB _ IOT teletransmission communication circuit.

Furthermore, the NB _ IOT remote communication circuit includes NB _ IOT module M5310A, the microprocessor chip ATMEGA328P is connected to NB _ IOT module M5310A, the NB _ IOT module M5310A is connected to the SIM card holder, and the latest NB _ IOT communication technology is used, so that not only is the communication quality improved, but also the energy consumption can be effectively reduced.

In a specific embodiment,

pins

30 and 31 of the microprocessor chip ATMEGA328P are connected to

pins

1 and 2 of NB _ IOT module M5310A, respectively, and pin 13 of the microprocessor chip ATMEGA328P is connected to pin 15 of NB _ IOT module M5310A via transistor SS 8050.

The

pins

14, 15, 16 and 17 of the microprocessing chip ATMEGA328P are respectively connected to the pins K7, J4, L6 and J5 of the radar agile transceiver chip AD 9361.

In order to supply power for the microprocessing chip ATMEGA328P, the radar agility transceiver chip AD9361 and the NB _ IOT remote communication circuit, the lithium battery, the switching voltage regulation chip LM2596, the Schottky diode D1, a plurality of resistors, inductors and capacitors form a 5V circuit, and the output of the 5V circuit and the voltage stabilizer AMS1117-3.3V form a 3.3V circuit.

The output of the 3.3V circuit is connected to the NB _ IOT remote communication circuit.

In the radar liquid level gauge for open channel measurement, the output of the 5.0V circuit is respectively connected to the microprocessing chip ATMEGA328P and the radar agile transceiver chip AD 9361.

In order to realize higher microwave signal detection quality, the transceiving antennas comprise at least two groups of transmitting antennas and at least two groups of receiving antennas.

According to the radar liquid level gauge for open channel measurement, the output voltage value of the lithium battery is 7.2V.

As a better implementation mode, the lithium battery comprises two 3.6V disposable lithium batteries which are connected in series, so that the lithium batteries with general models can be directly adopted, and the cost is reduced.

The utility model discloses for prior art gained beneficial effect lie in:

the utility model discloses radar level gauge, radar agility transceiver chip AD9361 can send microwave signal through receiving and dispatching antenna, and the receiving is through the microwave signal that the liquid level reflection returned, handles and calculates by micro-processing chip ATMEGA328P and reachs the liquid level height through radar agility transceiver chip AD 9361. The liquid level meter adopting the non-contact measurement technology can be stably and reliably applied to continuous liquid level measurement in various open tanks, is not directly contacted with liquid, and is less influenced by water quality; by using the latest NB _ IOT communication technology, not only is the communication quality improved, but also the energy consumption can be effectively reduced; the receiving and transmitting antenna comprises at least two groups of transmitting antennas and at least two groups of receiving antennas, and can realize higher microwave signal detection quality; and a disposable universal standard-pressure lithium battery is adopted, so that the cost is further reduced.

Drawings

The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.

In the drawings:

FIG. 1 is a logic block diagram of a radar level gauge for open channel gauging in embodiment 1;

FIG. 2 is a circuit diagram of the minimum system and critical pins of ATMEGA328P microprocessor of embodiment 1;

FIG. 3 is a circuit diagram of NB _ IOT module M5310A according to embodiment 1;

FIG. 4 shows a SIM card connection circuit according to embodiment 1;

FIG. 5 is a power conversion circuit diagram in embodiment 1;

fig. 6 is a circuit connection diagram of the radar agile transceiver chip AD9361 and the transceiver antenna in embodiment 1.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.

Example 1

Referring to fig. 1, fig. 1 is a logic block diagram of a radar level gauge for open channel measurement according to this embodiment 1, and includes a measurement unit, a microprocessor unit and a communication circuit, where the measurement unit includes a radar agile transceiver chip AD9361 and a transceiver antenna, the microprocessor unit includes a microprocessor chip ATMEGA328P, the microprocessor chip ATMEGA328P is respectively connected to the radar agile transceiver chip AD9361, a power conversion circuit and a communication circuit, the power conversion circuit is respectively connected to the radar agile transceiver chip AD9361 and the communication circuit, the power conversion circuit includes a lithium battery and a switch voltage adjusting chip LM2596, and the communication circuit includes an NB _ IOT remote communication circuit.

Radar level gauge, the level detection equipment who adopts radar range finding principle design promptly, radar agility transceiver chip AD9361 can drive the transmitting antenna and send out microwave signal, microwave signal's propagation velocity is the fixed value, the light velocity c promptly, therefore, after radar agility transceiver chip AD9361 received the microwave signal that returns through the liquid level reflection through receiving antenna, the time of receiving and dispatching was used for t, alright handle and calculate by microprocessing chip ATMEGA328P through radar agility transceiver chip AD9361 and obtain the liquid level height, what actually calculated earlier is the distance s of level gauge to liquid level, concrete formula is s ═ ct/2, by level gauge set up height during the installation again, subtract s, can calculate the liquid level height. Of course, in this principle description we consider the gauge as a point, for the purpose of facilitating understanding, and the specific height of its transmitting and receiving antenna may need to be considered in the actual distance calculation to make the result more accurate.

Referring to fig. 2, 3 and 4, further, the NB _ IOT remote communication circuit includes an NB _ IOT module M5310A, the microprocessor chip ATMEGA328P is connected to the NB _ IOT module M5310A, the NB _ IOT module M5310A is connected to the SIM card socket, and by using the latest NB _ IOT communication technology, not only is the communication quality improved, but also the energy consumption can be effectively reduced. The SIM card is accessed into the network to realize remote data communication, and the SIM card has low power consumption, strong covering capability and can reduce the cost.

As a specific implementation,

pins

30 and 31 of the microprocessor chip ATMEGA328P are connected to

pins

1 and 2 of NB _ IOT module M5310A, respectively, and these two pins are responsible for communication between the microprocessor chip ATMEGA328P and NB _ IOT module M5310A, and pin 13 of the microprocessor chip ATMEGA328P is connected to pin 15 of NB _ IOT module M5310A through a transistor SS8050, so that the microprocessor chip ATMEGA328P can reset or initialize the NB _ IOT module M5310A. The specific SIM card circuitry connected to the pins of NB _ IOT module M5310A, i.e.,

pins

8, 10, 11, 12, 13 are labeled in fig. 3 and 4 and are well known in the art.

Referring to fig. 2 and fig. 6, the

pins

14, 15, 16, and 17 of the micro-processing chip ATMEGA328P are respectively connected to the pins K7, J4, L6, and J5 of the radar agile transceiver chip AD9361, so as to implement data communication and instruction transmission between the micro-processing chip ATMEGA328P and the radar agile transceiver chip AD9361, the micro-processing chip ATMEGA328P has extremely low power consumption and good performance, and in the present embodiment, the tasks to be performed include communication, liquid level data reception, and calculation, etc., and the requirement on the processor is low, so the micro-processing chip ATMEGA328P is very suitable for such application scenarios.

Referring to fig. 5, in order to supply power to the microprocessor chip ATMEGA328P, the radar agile transceiver chip AD9361, and the NB _ IOT remote communication circuit, the lithium battery, the switching voltage regulation chip LM2596, the schottky diode D1, and the plurality of resistors, inductors, and capacitors form a 5V circuit, the output of the 5V circuit and the voltage regulator AMS1117-3.3V form a 3.3V circuit, and the leading-out points of 5V and 3.3V are marked. As shown in the figure, in a further improved scheme, the 3.3V circuit is further connected with capacitors C4, C5, C6, C7 and C8, so as to play a role in protecting filtering.

The switching voltage regulation chip LM2596 is a switching voltage regulator of a buck power management monolithic integrated circuit, can output 3A driving current, has good linearity and load regulation characteristics, and can obtain 5.0V voltage by using the switching voltage regulation chip, and further, the voltage regulator AMS1117-3.3 is a forward low-voltage drop voltage regulator with 3.3V output voltage, and 3.3V output can be obtained by inputting 5.0V voltage.

Referring to fig. 1, fig. 3 and fig. 5, the output of the 3.3V circuit is connected to the NB _ IOT remote communication circuit, the output of the 5.0V circuit is connected to the microprocessor chip ATMEGA328P and the radar agile transceiver chip AD9361, respectively, and the specific power pin connections can refer to the pin definitions of the chips or refer to the connections shown in the figures.

In order to realize higher microwave signal detection quality, the transceiving antenna comprises two groups of transmitting antennas and two groups of receiving antennas. Specifically, referring to fig. 6, as an example of using the specification of the radar agile transceiver chip AD9361, we name two pins of the radar agile transceiver chip AD9361 connected to two sets of transmitting antennas TX1A _ P, TX1A _ N and TX2A _ P, TX2A _ N, that is, two pins of each set of transmitting antennas connected to the radar agile transceiver chip AD9361 are needed, and similarly, we name two pins of the radar agile transceiver chip AD9361 connected to two sets of receiving antennas RX1A _ P, RX1A _ N and RX2A _ P, RX2A _ N, and further, we use a balun with model number 2450bl15b050e between the antenna interface and the pins to complete transmission and reception. The antenna interface can be an SMA interface.

Balun has a balance-transfer imbalance effect: according to the antenna theory, dipole antennas belong to balanced antennas (dipole antennas, dipoles, bipyramids and yagi), while the feed lines of antennas are generally coaxial cables and belong to unbalanced transmission lines, if the feed lines are directly connected, high-frequency current flows through the outer skin of the coaxial cables, and the high-frequency current flows through the outer skin, so that radiation components are necessary, and the polarization direction of the antennas is influenced. Therefore, a balun is added between the antenna and the cable to suppress a current flowing to the outside of the cable shield, that is, to cut off a high-frequency current flowing from the vibrator through the cable shield sheath.

The radar agile transceiver chip AD9361 is a highly integrated solution with integrated analog filtering, mixers, data converters, frequency synthesizers for transmit and receive channels, and other functions in the digital domain including programmable gain, dc offset calibration, etc. The device well solves the direct current offset and quadrature error limitation of the prior zero intermediate frequency architecture through the function optimization of the quadrature error calibration and the direct current offset calibration, thereby successfully applying the zero intermediate frequency architecture to the chip product of the software defined radio, also needing no external filter and really realizing the establishment of a hardware platform from theory to practice of the software defined radio. The radar agile transceiver chip AD9361 mainly has the functions of amplifying, A/D or D/A converting, mixing, filtering and the like of signals, and converting the signals between radio frequency signals and baseband signals.

The same kind of transceiver usually integrates only one transmitting channel and one receiving channel, the frequency range is 300 MHz-3.8 GHz, the channel bandwidth is 1.5 MHz-28 MHz, the noise coefficient is 3.5dB under the condition of 1GHz, and the noise coefficient can be deteriorated to 5.5 dB-10 dB at higher frequency such as 2 GHz. The AD9361 has higher integration level, comprises 2 transmitting channels and 2 receiving channels, the frequency range is 70 MHz-6 GHz, the channel bandwidth is 200 kHz-56 MHz, the noise coefficient is 2dB under the condition of 1GHz, and the noise coefficient can be less than 3dB at higher frequency such as 2 GHz. As shown in fig. 1, the radar agility transceiver chip AD9361 sends out microwave signals through the transceiver antenna, receives the microwave signals reflected by the liquid level, processes the signals by the radar agility transceiver chip AD9361, and calculates by the microprocessor chip ATMEGA328P to obtain the liquid level height.

Referring to fig. 5, the output voltage value of the lithium battery is 7.2V, and as a preferred embodiment, the lithium battery includes two 3.6V disposable lithium batteries, and the disposable lithium batteries are connected in series, so that the lithium battery with a general model can be directly used, and the cost is reduced.

When in use, the utility model discloses carry out basic parameter setting earlier, phone card installation and communication test, then fix to in the specific shell (totally enclosed). Then use specialized tool to revise the utility model discloses operating parameter according to on-the-spot actual conditions. Such as NBIOT reporting time, a radar agile transceiver chip AD9361 acquisition time interval and the like, and automatically carry out radar microwave liquid level measurement and NB-IOT data remote transmission to a server according to the set time interval. The equipment is designed in a totally-enclosed manner, and can be installed and deployed in various complex environments, such as severe environments of underwater, pipe wells, air and the like.

In the scheme of this embodiment, the radar agility transceiver chip AD9361 can send out microwave signals through the transceiver antenna, receive microwave signals reflected by the liquid level, and obtain the liquid level height by processing the signals through the radar agility transceiver chip AD9361 and calculating the signals through the microprocessor chip ATMEGA 328P. The liquid level meter adopting the non-contact measurement technology can be stably and reliably applied to continuous liquid level measurement in various open tanks, has double sending and receiving channels, has high channel bandwidth and wide frequency coverage, is not directly contacted with liquid, and is less influenced by water quality; by using the latest NB _ IOT communication technology, not only is the communication quality improved, but also the energy consumption can be effectively reduced; the receiving and transmitting antenna comprises at least two groups of transmitting antennas and at least two groups of receiving antennas, and can realize higher microwave signal detection quality; and a disposable universal standard-pressure lithium battery is adopted, so that the cost is further reduced.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a radar level gauge for open channel measurement, includes measuring unit, microprocessing unit and communication circuit, its characterized in that, the measuring unit includes radar agility transceiver chip AD9361 and transceiver antenna, the microprocessing unit includes microprocessing chip ATMEGA328P, radar agility transceiver chip AD9361, power conversion circuit and communication circuit are connected respectively to microprocessing chip ATMEGA328P, power conversion circuit is connected with radar agility transceiver chip AD9361 and communication circuit respectively, power conversion circuit includes lithium cell and switching voltage regulation chip LM2596, communication circuit includes NB _ IOT teletransmission communication circuit.

2. The radar level gauge according to claim 1, wherein the NB _ IOT remote communication circuit comprises an NB _ IOT module M5310A, the microprocessor chip ATMEGA328P is connected to the NB _ IOT module M5310A, and the NB _ IOT module M5310A is connected to a SIM card holder.

3. The radar level gauge according to claim 2, wherein pins 30 and 31 of the ATMEGA328P of the microprocessor chip are connected to pins 1 and 2 of NB _ IOT module M5310A, respectively, and pin 13 of the ATMEGA328P of the microprocessor chip is connected to pin 15 of NB _ IOT module M5310A via transistor SS 8050.

4. The radar level gauge for open channel gauging according to claim 1, wherein the pins 14, 15, 16, 17 of said micro-processing chip ATMEGA328P are connected to the pins K7, J4, L6, J5 of a radar agile transceiver chip AD9361, respectively.

5. The radar level gauge according to claim 1, wherein the lithium battery, the switching voltage regulation chip LM2596, the Schottky diode D1, and the resistors, the inductors and the capacitors form a 5V circuit, and the output of the 5V circuit and the voltage regulator AMS1117-3.3V form a 3.3V circuit.

6. The radar level gauge for open channel gauging according to claim 5, wherein the output of said 3.3V circuit is connected to an NB _ IOT telemetric communication circuit.

7. The radar level gauge for open channel gauging according to claim 5, wherein the outputs of said 5.0V circuit are connected to a micro processing chip ATMEGA328P and a radar agile transceiver chip AD9361, respectively.

8. The radar level gauge for open channel gauging according to claim 1, wherein said transceiver antennas comprise at least two sets of transmit antennas and at least two sets of receive antennas.

9. The radar level gauge for open channel gauging according to claim 1, wherein the output voltage value of said lithium battery is 7.2V.

10. The radar level gauge according to claim 1, wherein said lithium battery comprises two disposable lithium batteries with a voltage of 3.6V, said disposable lithium batteries being connected in series.