CN115175017B - Body area network molecular communication channel characterization system - Google Patents
Body area network molecular communication channel characterization system Download PDFInfo
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- CN115175017B CN115175017B CN202210684806.1A CN202210684806A CN115175017B CN 115175017 B CN115175017 B CN 115175017B CN 202210684806 A CN202210684806 A CN 202210684806A CN 115175017 B CN115175017 B CN 115175017B
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/005—Transmission systems in which the medium consists of the human body
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
- H04Q2209/84—Measuring functions
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention relates to a body area network molecular communication channel characterization system, which comprises a signal source area, an electromagnetic valve data transmission area, a constant temperature control area, a power source area, a data sampling area and a waste liquid collecting area, wherein the signal source area comprises a first messenger molecule storage container, a second messenger molecule storage container and a background stream storage container; the electromagnetic valve data transmitting area comprises three electromagnetic valves; the constant temperature control area comprises a constant temperature control module; the power source area comprises a peristaltic pump; the data sampling area comprises a first temperature measuring module, a second temperature measuring module, a first pressure measuring module, a second pressure measuring module and a color data receiving module; the waste collection area includes a waste collection container and a flow rate measurement module. The characterization system establishes a single-power-source molecular communication comprehensive experiment platform, realizes the transmission and receiving work of non-contact molecular communication data, and solves the problem that the current molecular communication research does not consider the influence of the molecular communication environment on communication.
Description
Technical Field
The invention belongs to the technical field of communication systems, and particularly relates to a body area network molecular communication channel characterization system.
Background
Currently, nanometer-sized devices have appeared in the field of view of people, and practical research cases have been presented for finding human diseases by using nanometer machines. Due to size limitation, the functions carried by a single nanometer machine are simpler, and different nanometer machines are combined to form a human nanometer network, so that more complex treatment means are possible. Meanwhile, due to the limitation of the micro size of the nanomachines, the traditional communication means have huge cost for communication on the nanoscale, and are not suitable for communication between nanomachines.
Molecular communication (Molecular Communication, MC) as a branch of the body area network (Body Area Network, BAN) is a communication scheme that utilizes biochemical molecules as the carrier information. Molecular communication is most different from traditional communication means in that the type of carrier is different, traditional communication uses carriers such as light, sound, electricity and the like for communication, and molecular communication uses molecules for communication, and carriers carrying information in molecular communication are called messenger molecules.
Molecular communication has the characteristics of biocompatibility, low energy consumption, small volume and the like, and is the best choice for forming a nano network currently compared with the traditional communication means, especially for a tiny nano machine. Molecular communication can be regarded as an alternative to electromagnetic wave communication, and has a good application prospect especially in the scene of serious attenuation of electromagnetic waves. In complex metal pipes, traditional electromagnetic wave communication is disturbed, and effective communication can be formed by using diffusion of molecules in a fluid medium; in the blood vessel of the human body, chemical molecules or nano particles with biological compatibility are used to form communication inside and outside the human body, thus realizing the targeted transmission of the medicine; between different cells, chemical molecules are used to form an intercellular communication network.
The basic structure of molecular communication can be divided into four parts, namely a transmitter, a receiver, an information carrier and a propagation medium, wherein the transmitter and the receiver can be nanomachines or artificially synthesized cells, the transmitter and the receiver are mainly responsible for transmitting and receiving messenger molecules, the information carrier responsible for carrying information is generally biochemical molecules or artificially synthesized nano particles, and the propagation medium can be divided into liquid and gas according to different medium forms.
Due to the revolutionary application of molecular communication in many fields, so far related scholars have conducted a great deal of research on this. However, most of the current research on molecular communication is theoretical research, and is mainly focused on implementation of communication, and the influence of molecular communication environment on communication is not considered, so that inconvenience is brought to the research.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a body area network molecular communication channel characterization system. The technical problems to be solved by the invention are realized by the following technical scheme:
the embodiment of the invention provides a body area network molecular communication channel characterization system, which comprises a signal source area, an electromagnetic valve data transmission area, a constant temperature control area, a power source area, a data sampling area and a waste liquid collecting area, wherein,
the signal source region comprises a first messenger molecule storage container, a second messenger molecule storage container and a background stream storage container which are arranged in parallel;
the electromagnetic valve data transmitting area comprises three electromagnetic valves correspondingly connected with the first messenger molecule storage container, the second messenger molecule storage container and the background stream storage container, and the output ends of the three electromagnetic valves are connected;
the constant temperature control area comprises a constant temperature control module, and the input end of the constant temperature control module is connected with the output ends of the three electromagnetic valves;
the power source area comprises a peristaltic pump, the input end of the peristaltic pump is connected with the output end of the constant temperature control module, and the peristaltic pump is fixed on the acrylic plate;
the data sampling area comprises a first temperature measuring module, a second temperature measuring module, a first pressure measuring module, a second pressure measuring module and a color data receiving module, wherein the first temperature measuring module, the color data receiving module and the first pressure measuring module are sequentially arranged on an output pipeline of the peristaltic pump, a pipeline at the position of the color data receiving module adopts a transparent pipeline, the second pressure measuring module is arranged on the transparent pipeline, and the second temperature measuring module is arranged in the environment;
the waste liquid collecting area comprises a waste liquid collecting container and a flow rate measuring module, wherein the input end of the waste liquid collecting container is connected to the output end of the peristaltic pump, and the flow rate measuring module monitors the real-time flow rate of liquid by measuring the weight of waste liquid.
In one embodiment of the invention, the first messenger molecule storage container stores a bright blue pigment solution, the second messenger molecule storage container stores a bright red pigment solution, and the background stream storage container stores a colorless liquid.
In one embodiment of the invention, the first messenger molecule storage container, the second messenger molecule storage container and the background flow storage container are connected with three electromagnetic valves in a one-to-one correspondence manner through silica gel pipelines, the output ends of the three electromagnetic valves are connected through a four-way pagoda joint, and the output end of the four-way pagoda joint is connected with the input end of the constant temperature control module;
the three electromagnetic valves are fixed on an acrylic plate;
the three electromagnetic valves are normally closed electromagnetic valves.
In one embodiment of the invention, the constant temperature control module comprises a semiconductor refrigeration sheet, an iron sheet, a temperature sensor, a heating area and an air-cooled radiator, wherein the iron sheet is arranged between the semiconductor refrigeration sheet and the heating area, a part of the iron sheet is fixed with a part of the temperature sensor, and the air-cooled radiator is arranged at the bottom of the semiconductor refrigeration sheet.
In one embodiment of the present invention, the thermostatic control area further includes a thermostatic control driving module, and an output end of the thermostatic control driving module is connected with the thermostatic control module;
the constant temperature control driving module is provided with two singlechip signal inlets for respectively controlling and outputting forward voltage and reverse voltage.
In one embodiment of the invention, the power source zone further comprises a peristaltic pump motor drive module, wherein,
the peristaltic pump motor driving module is connected with the peristaltic pump.
In one embodiment of the invention, the peristaltic pump is provided with a magnet and a hall sensor, wherein,
the magnet is attached to the edge of the peristaltic pump rotor to rotate along with the rotation of the peristaltic pump, and the Hall sensor is attached to the buckle of the peristaltic pump to emit high-level pulses along with the rotation of the peristaltic pump.
In one embodiment of the present invention, the first temperature measurement module and the second temperature measurement module each include a PCB board and a sensor chip located on the PCB board, where the sensor chip employs a sensor chip packaged in a small outline;
the first pressure measurement module includes a touch sensor; the peristaltic pump output pipeline is arranged on the touch sensor, and an acrylic cover plate is pressed on the peristaltic pump output pipeline; a groove is formed at the contact position of the acrylic cover plate and the peristaltic pump output pipeline so as to deform the peristaltic pump output pipeline;
the second pressure measurement module comprises a micro differential pressure sensor; the micro differential pressure sensor comprises a positive air pressure inlet and a negative air pressure inlet, the positive air pressure inlet is connected with the port of the transparent pipeline, and the negative air pressure inlet is communicated with the atmospheric pressure environment;
the color data receiving module comprises 4 self-luminous white light emitting diodes to collect information of different messenger molecule concentrations.
In one embodiment of the invention, the flow rate measurement module comprises a weighing sensor, wherein an acrylic fixing plate is arranged at the upper part and the bottom of the weighing sensor, and the waste liquid collection container is fixed on the acrylic fixing plate at the upper part of the weighing sensor.
In one embodiment of the invention, the constant temperature control module adopts a PID algorithm to perform constant temperature control; three of the solenoid valves send messenger molecules or background flow signals in the form of OOK model.
Compared with the prior art, the invention has the beneficial effects that:
1. the characterization system builds a single-power-source molecular communication comprehensive experiment platform through the electromagnetic valve, the constant temperature control module and the peristaltic pump, and simultaneously realizes non-contact molecular communication data sending and receiving work through the two temperature measurement modules, the two pressure measurement modules and the color data receiving module, so that the problem that the molecular communication environment is not considered in the current molecular communication research, the equipment is simple and convenient to operate, and the accuracy is high.
2. The characterization system considers the influence of common physiological factors such as human body temperature, blood pressure and blood flow velocity on messenger molecule diffusion, and the experimental platform realizes that temperature, pressure and flow velocity information are acquired by a non-contact method by arranging the temperature measuring module, the pressure measuring module and the color data receiving module on the pipeline.
Drawings
Fig. 1 is a schematic structural diagram of a body area network molecular communication channel characterization system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an information sending program of a data sending module of an electromagnetic valve according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a constant temperature control module according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a procedure for sending information of a thermostatic control module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a peristaltic pump according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a control board of a power source SCM according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a PCB board of a temperature measurement module according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a first pressure measurement module touch sensor PCB according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a first pressure measurement module according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a PCB board of an air pressure sensor of a second pressure measurement module according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a second pressure measurement module, a color data receiving module and a schematic T-shaped glass tube according to an embodiment of the present invention;
fig. 12 is a schematic diagram of a flow rate measurement module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but embodiments of the present invention are not limited thereto.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of a molecular communication channel characterization system of a body area network according to an embodiment of the present invention. The body area network molecular communication channel characterization system is a molecular communication comprehensive experiment platform for simulating the vascular environment in a human body. According to the functional area division, the body area network molecular communication channel characterization system comprises: the device comprises a signal source area 1, an electromagnetic valve data transmission area 2, a constant temperature control area 3, a power source area 4, a data sampling area 5 and a waste liquid collecting area 6.
The signal source region 1 is used to store a pigment solution as messenger molecules and a colorless liquid as a background stream.
The signal source region 1 includes a first messenger molecule storage container 11, a second messenger molecule storage container 12, and a background stream storage container 13 arranged in parallel.
In one embodiment, the first messenger molecule storage container 11 stores a bright blue pigment solution, the second messenger molecule storage container 12 stores a bright red pigment solution, and the background stream storage container 13 stores a colorless liquid.
The molecular communication channel characterization system constructed by the embodiment uses water-soluble pigment as messenger molecules for carrying information, and colorless water is used as background fluid, the water-soluble pigment can be freely diffused in the water, and the distribution condition of messenger molecule concentration can be intuitively seen from the distribution of colors. It will be appreciated that the pigment acts as a message carrying messenger molecule, and that the colourless liquid water acts as a channel through which the messenger molecule is transported from the sender to the receiver by the flow of the water stream. After the colorless liquid is injected into the high-concentration pigment solution, the pigment solution can be diffused in the silica gel pipeline, so that a liquid-based molecular communication diffusion model is displayed.
Specifically, the pheromone carrying data information in the signal source is prepared by adopting pigment solution, wherein the pigment solution mainly comprises bright red pigment solution and bright blue pigment solution, and the pigment solution and water (1L) are matched with corresponding pigment solution through fixed proportion each time.
Specifically, the storage containers 11, 12, 13 may be lower-mouth bottles, that is, pigment solution and colorless liquid are stored in the lower-mouth bottles, and the lower-mouth bottle mouth is sealed by a stopper to prevent concentration change of the pigment solution caused by evaporation of water molecules in the solution due to air drying.
The electromagnetic valve data transmitting area 2 has the functions that: the molecular communication channel characterization system built in the embodiment is based on a molecular communication structure of a single power source, and messenger molecules with the same volume are injected into a silica gel pipeline by controlling the switch of an electromagnetic valve.
The electromagnetic valve data transmitting area 2 comprises three electromagnetic valves 21 correspondingly connected with the first messenger molecule storage container 11, the second messenger molecule storage container 12 and the background stream storage container 13, and the output ends of the three electromagnetic valves 21 are connected.
In a specific embodiment, the first messenger molecule storage container 11, the second messenger molecule storage container 12 and the background stream storage container 13 are connected with the three electromagnetic valves 21 in a one-to-one correspondence manner through silica gel pipelines, the output ends of the three electromagnetic valves 21 are connected through a four-way pagoda joint 22, and the output end of the four-way pagoda joint 22 is connected with the input end of the constant temperature control module 31; the three solenoid valves 21 are all fixed on an acrylic plate.
The electromagnetic valve data transmitting area 2 uses three electromagnetic valves 21 altogether, the three electromagnetic valves 21 are connected with the storage containers 11, 12 and 13 through silica gel pipelines, and the output ends of the three electromagnetic valves 21 are connected with each other through four-way pagoda connectors to serve as messenger molecule inlets; the four-way pagoda joint is characterized in that the front and the back of the four-way pagoda joint are input background water flow and output mixed liquid, red pigment solution and blue pigment solution are arranged on two sides of the four-way pagoda joint, three input interfaces are controlled by electromagnetic valves, the electromagnetic valves on two sides respectively control the injection of blue pigment and red pigment, and the electromagnetic valve in the middle is responsible for injecting colorless water flow. Further, from the aspect of saving energy consumption, all three electromagnetic valves adopt normally closed electromagnetic valves; in order to avoid the influence of different water pressures, only one electromagnetic valve is opened at the same time, for example, the electromagnetic valve for controlling colorless water in the middle is in a normally open state, and the electromagnetic valves on the other two sides are mainly in a closed state. The voltage of the electromagnetic valve is 24V direct current voltage, and the power is 4W.
Specifically, 3 solenoid valves are fixed by using an acrylic bottom plate, and screw holes (the model of which can be M3 screw holes) are formed in the bottoms of the three solenoid valves 21, and the solenoid valves are fixed on the acrylic plate through the screw holes.
Specifically, information is modulated into a form of messenger molecule concentration wave by adopting a concentration-based modulation mode, and then messenger molecules are injected into a silica gel pipeline by controlling the switching-on and switching-off of an electromagnetic valve through a singlechip. The singlechip needs a circuit driving board with the voltage of 24V and the current of more than 0.2A to control the opening and closing of the electromagnetic valve; because three electromagnetic valves need to be driven and controlled, two double-circuit motor driving modules are used, 1 double-circuit motor driving module controls two electromagnetic valves, 1 double-circuit motor driving module controls 1 electromagnetic valve, the output voltage of the circuit driving module is between 5V and 35V, and the maximum driving current is 2A.
Referring to fig. 2, fig. 2 is a schematic flow chart of an information sending program of a data sending module of an electromagnetic valve according to an embodiment of the invention. The three solenoid valves 21 send messenger molecules or background flow signals in the form of OOK model.
Specifically, the emission of messenger molecules is realized in the form of a solenoid valve switch, so that a signal of 0 or 1 is transmitted in the form of an OOK model. Assuming that there is no delay in switching the solenoid valve, a piece of information-carrying water flow with a volume of 0.5mL is sent first to represent the sent one-bit information, if the water flow is 0.5mL of bright blue pigment solution, the signal 1 is sent, if the water flow is 0.5mL of colorless liquid background flow, the signal 0 is sent, and in order to avoid interference of messenger molecules on subsequent signals as much as possible, the subsequent 9.5mL of colorless liquid background flow is followed to serve as buffer between the two signals. Thereafter, the above steps were repeated, and signaling was performed using a bright red pigment solution and a colorless liquid background stream as a control group.
The change of temperature can influence the diffusion coefficient of messenger molecules, in order to realize the control to the temperature, this embodiment sets up thermostatic control district 3, designs a thermostatic control module through the singlechip, carries out a temperature control to the rivers carrier.
The constant temperature control area 3 comprises a constant temperature control module 31, and the input end of the constant temperature control module 31 is connected with the output ends of the three electromagnetic valves.
Referring to fig. 3, fig. 3 is a schematic diagram of a constant temperature control module according to an embodiment of the invention. The constant temperature control module 31 comprises a semiconductor refrigeration sheet 311, an iron sheet 312, a temperature sensor 313, a heating area 314 and an air-cooled radiator 315, wherein the iron sheet 312 is arranged between the semiconductor refrigeration sheet 311 and the heating area 314, a part of the iron sheet 312 is fixed with a part of the temperature sensor 313, and the air-cooled radiator 315 is arranged at the bottom of the semiconductor refrigeration sheet 311.
Specifically, the constant temperature control module 31 performs constant temperature control using the semiconductor cooling fin 311, and the semiconductor cooling fin 311 is a heat transfer element that absorbs heat and releases heat to transfer heat from one side to the other side. In order to obtain the surface temperature of the semiconductor refrigeration piece 311, a closed loop control is formed on the temperature, a customized thin iron piece 312 is added between the semiconductor refrigeration piece 311 and a heating area 314, a part of the thin iron piece 312 is fixed with a temperature sensor 313, the actual temperature of the surface of the semiconductor refrigeration piece 311 is derived, and then the temperature sensor 313 converts the temperature information into a digital signal and outputs the digital signal to a singlechip.
Referring to fig. 4, fig. 4 is a schematic flow chart of a process for sending information of a thermostatic control module according to an embodiment of the invention. The constant temperature control module 31 adopts PID algorithm to perform constant temperature control by controlling the surface temperature of the semiconductor refrigerating sheet.
Specifically, the constant temperature control module 31 firstly sets an initial temperature, samples the surface temperature of the semiconductor refrigeration sheet through the temperature sensor, and compares the current actual temperature with the set temperature. If the current temperature is higher than the set temperature, the refrigerating mode is entered, the pulse width modulation (PWM signal) of the single chip microcomputer which is output currently is calculated through a PID algorithm, forward voltage is applied to a semiconductor refrigerating sheet through a driving circuit, the temperature is controlled to be reduced, if the current temperature is lower than the set temperature, the heating mode is entered, similarly to the refrigerating mode, the PWM signal is calculated through the PID algorithm, reverse voltage is applied through the driving circuit, and the heating is started.
Further, in the thermostatic control module 31, an air-cooled radiator is added below the semiconductor cooling plate 311, the air-cooled radiator and the semiconductor cooling plate 311 are tightly adhered by heat conducting silica gel, and the copper pipe air-cooled radiator rapidly discharges the heat which is excessive on the other side, so that the semiconductor cooling plate 311 is protected from overhigh temperature and is beneficial to further reduction of temperature.
In a specific embodiment, the thermostatic control area 3 further includes a temperature control driving module 32, the semiconductor refrigeration sheet 311 is controlled by the temperature control driving module 32, and an output end of the temperature control driving module 32 is connected with the thermostatic control module 31. The constant temperature control driving module 32 is provided with two single chip microcomputer signal inlets for respectively controlling the output of forward voltage and the output of reverse voltage. The constant temperature control driving module 32 is controlled by a single chip microcomputer 33.
Specifically, the temperature control driving module 32 selects a motor with a voltage of 12V and a maximum current of 43A for driving. The driving circuit is provided with two singlechip signal input ports for respectively controlling and outputting forward voltage and reverse voltage to realize constant temperature control.
In the molecular communication channel characterization system of this embodiment, water flow enters the thermostatic control area 3 from the input device, and after being heated or cooled by the thermostatic control module 31, flows into the peristaltic pump 41 of the power source area 4, and the peristaltic pump 41 is fixed on the acrylic plate.
The power source area 4 comprises a peristaltic pump 41 and a peristaltic pump motor driving module 42, wherein the input end of the peristaltic pump is connected with the output end of the constant temperature control module, and the peristaltic pump motor driving module 42 is connected with the peristaltic pump 41.
The embodiment is based on a single power source structure, and adopts a constant-speed peristaltic pump as a power source to accurately control the flow rate of liquid. The whole power source area consists of a single chip microcomputer, a peristaltic pump motor driving module 42 and a peristaltic pump 41, wherein the single chip microcomputer is connected with the peristaltic pump motor driving module 42, the peristaltic pump motor driving module 42 is connected with the peristaltic pump 41, and the peristaltic pump motor driving module 42 is controlled by the single chip microcomputer so as to drive the peristaltic pump 41 to operate and synchronously operate with the data sampling area 2.
Specifically, the peristaltic pump 41 has an operating voltage of 24V and a maximum flow rate of 154mL/min, and the core control component is a stepper motor. The peristaltic pump 41 is characterized in that the core of the peristaltic pump 41 is a stepping motor, the singlechip cannot directly drive the stepping motor, and a corresponding peristaltic pump motor driving module 42 is arranged for the stepping motor; the stepper motor will cause serious shaking when in use, so the fixed shape of the acrylic plate is designed to reduce the interference of shaking of the peristaltic pump 41 to the subsequent pipeline.
Referring to fig. 5, fig. 5 is a schematic diagram of a peristaltic pump according to an embodiment of the invention. The peristaltic pump 41 is provided with a magnet 43 and a Hall sensor 44, wherein the magnet 43 is attached to the edge of the rotating part of the peristaltic pump 41 to rotate along with the rotation of the peristaltic pump 41, and the Hall sensor 44 is attached to the buckle of the peristaltic pump 41 to emit high-level pulses along with the rotation of the peristaltic pump 41.
In particular, in order to avoid systematic errors, i.e. that the current peristaltic pump speed does not correspond to the actual peristaltic pump speed, it is also necessary to obtain the actual speed of the current peristaltic pump. In order to detect the real rotation speed of the peristaltic pump in real time and not interfere with the actual rotation of the peristaltic pump, the peristaltic pump is provided with a magnet and a Hall sensor at the edge as shown in fig. 5. The magnet 43 is attached to the middle of the peristaltic pump 41, the peristaltic pump 41 drives the magnet 43 to rotate together, the Hall sensor 44 is attached to the clip of the peristaltic pump 41, the Hall sensor 44 sends out a high-level pulse every time the peristaltic pump 41 rotates, the time difference between the two high-level pulses is the time required by the rotation of the rotor of the peristaltic pump 41 for one circle, and then the time required by the rotation of the magnet 43 for one circle is collected through the singlechip to calculate the actual rotation speed of the peristaltic pump 41.
Referring to fig. 6, fig. 6 is a schematic diagram of a control board of a power source single-chip microcomputer according to an embodiment of the invention. Specifically, 4 conventional patch keys and a power indicator lamp are added on a singlechip control board for controlling the peristaltic pump 41, and the patch keys can manually control the peristaltic pump according to a program; the starting and stopping of the peristaltic pump and the setting of the flow rate can be manually controlled through the key. In addition, the power source area 4 is also provided with a small liquid crystal display screen for displaying the current peristaltic pump rotating speed information.
The data sampling area 5 is responsible for collecting temperature, pressure and color data. The data sampling area 5 comprises a first temperature measuring module 51, a second temperature measuring module 52, a first pressure measuring module 53, a second pressure measuring module 54 and a color data receiving module 55, wherein the first temperature measuring module 51, the color data receiving module 55 and the first pressure measuring module 53 are sequentially arranged on an output pipeline of the peristaltic pump 41, a transparent pipeline is adopted as a pipeline at the position of the color data receiving module 55, the second pressure measuring module 54 is arranged on the transparent pipeline, and the second temperature measuring module 52 is arranged in the environment.
In the embodiment, the silicone tube is used as the pipeline material, and the silicone tube is soft and has certain elasticity and is similar to a human blood vessel; the conduit at the color data receiving module 55 is a transparent glass conduit.
First, temperature data measurement will be described. The acrylic platform is provided with two temperature data measuring modules, namely a first temperature measuring module 51 and a second temperature measuring module 52, wherein the first temperature measuring module 51 is responsible for collecting temperature data of an output pipeline of the peristaltic pump 41, namely a silica gel pipeline, and the second temperature measuring module 52 is responsible for collecting environmental temperature data, and is exposed in the air to measure the environmental temperature. The first temperature measurement module 51 is tightly attached to the silicone tube by using the acrylic plate cover plate, namely, the first temperature measurement module 51 is placed on the acrylic platform, the silicone tube is placed on the first temperature measurement module 51, and the acrylic plate cover plate covers the silicone tube, so that the first temperature measurement module 51 is tightly attached to the silicone tube.
Referring to fig. 7, fig. 7 is a schematic diagram of a PCB board of a temperature measurement module according to an embodiment of the present invention. In fig. 7, R1 and R2 are small chip resistors, D1 is an LED lamp, DQ is an input signal pin, GND is a ground pin, and a chip model is DALLAS18B20. The temperature measurement modules 51, 52 each include a PCB board and a sensor chip located on the PCB board, wherein the sensor chip employs a low profile packaged sensor chip.
Specifically, in order to form a tight fit with the silicone tube, the temperature of the surface of the silicone tube is directly obtained, and the temperature measurement module uses a Small Out-Line Package (SOP) sensor chip to convert temperature information into a digital signal and then transmits the data to the singlechip through an integrated circuit bus (Inter-Integrated Circuit, IIC). In order to reduce the volume of the module as much as possible, the temperature measurement module circuit board uses a small resistor packaged by a patch, and a small patch LCD indicator lamp is arranged on the PCB to display the current power supply condition, so that the condition of long-time disconnection is prevented.
Next, the pipe pressure data measurement will be described. The acrylic platform is provided with two pressure sampling modules, namely a first pressure measuring module 53 and a second pressure measuring module 54, wherein the first pressure measuring module 53 is used for measuring the pressure of the silica gel pipeline, and the second pressure measuring module 54 is used for measuring the pressure in the transparent pipeline at the color data receiving module 55.
Referring to fig. 8 and 9, fig. 8 is a schematic diagram of a PCB of a touch sensor of a first pressure measurement module according to an embodiment of the present invention, and fig. 9 is a schematic diagram of a structure of the first pressure measurement module according to an embodiment of the present invention. In FIG. 8, all R1-R6 are resistors, GND is the ground pin, C1-C14 are capacitors, DOUT is the data output pin, DIN is the data input pin, CS is the chip select signal pin, SCLK is the serial clock pin, +5 is the 5V power supply, U1 is the touch sensor FS1500N, U2 and U3 are the operational amplifier ADA4528, U4 is the analog-to-digital converter AD7791, and TP1-4 are test points.
Specifically, the first pressure measurement module 53 includes a touch sensor; the peristaltic pump 41 output pipeline is arranged on the touch sensor, and an acrylic cover plate is pressed on the peristaltic pump 41 output pipeline; a groove is formed at the contact position of the acrylic cover plate and the output pipeline of the peristaltic pump 41 so as to deform the output pipeline of the peristaltic pump 41.
Specifically, the touch sensor is similar to the weighing sensor, the stress range is 0-5N, the power supply voltage is 5V, and the differential output voltage range of the signal pins is 0-30mV. Firstly amplifying a signal generated by a touch sensor by 100 times through a differential operational amplifier to enable the signal to be in a range of 0-3V, then converting an analog voltage signal into a digital signal of a serial peripheral interface (Serial Peripheral Interface, SPI) by utilizing a 24-bit digital-to-analog conversion chip, and transmitting pressure information into a computer after receiving the digital signal by a singlechip responsible for data sampling, so that the measurement of the pressure in an output pipeline of a peristaltic pump 41, namely a rubber tube, can be completed.
Specifically, the acrylic cover plate with the groove is designed to tightly attach the silicone tube to the contact of the touch sensor, so that fixed deformation of the silicone tube is formed, along with the increase of the pressure of water flow, the extrusion force of water flow in the tube to the wall of the silicone tube is increased, the pressure of the water flow is sensed by the touch sensor tightly attached to the silicone tube under the conduction of force, and the pressure of the water flow in the silicone tube is sensed by the touch sensor in combination with the corresponding acrylic cover plate.
Referring to fig. 10 and 11, fig. 10 is a schematic diagram of a PCB board of a barometric sensor of a second pressure measurement module according to an embodiment of the present invention, and fig. 11 is a schematic diagram of a structure of a second pressure measurement module, a color data receiving module, and a schematic diagram of a T-glass tube according to an embodiment of the present invention. In FIG. 10, all R1-R3 are resistors, C1-C3 are capacitors, U1 is XGZP6897D type barometric sensor, U2 is AMS1117 buck chip, and P1 is a pin interface.
The second pressure measurement module 54 includes a micro differential pressure sensor; the micro differential pressure sensor comprises a positive air pressure inlet and a negative air pressure inlet, wherein the positive air pressure inlet is connected with the port of the transparent pipeline, and the negative air pressure inlet is communicated with the atmospheric pressure environment.
Specifically, the present embodiment employs a T-glass tube as a transparent tube mounted on the color data receiving module to receive color data. The glass tube in the color data sampling area is made of a rigid material and is fragile, so that the pressure of water flow in the T-shaped glass tube is measured by adopting a gas pressure sensor, the pressure in the T-shaped glass tube is transmitted to the gas pressure sensor through gas, and the gas pressure sensor is responsible for sampling output data. The air pressure sensor adopts a micro differential pressure sensor packaged by a patch, the micro differential pressure sensor is provided with a positive air pressure inlet and a negative air pressure inlet, and differential pressure data is obtained by comparing the difference value of the positive air pressure inlet and the negative air pressure inlet. Because the positive air pressure inlet is not tightly connected with the glass pipeline directly, a latex tube is adopted to connect between the positive air pressure inlet and the glass pipe; when the water flow pressure in the glass tube is measured, the positive air pressure inlet is connected with the emulsion pipeline, the negative air pressure inlet is opened, the air pressure of the positive air pressure inlet is equal to the pressure in the glass tube, and the air pressure of the negative air pressure inlet is equal to the atmospheric pressure.
Besides the core air pressure sensor, the glass tube pressure measuring module is also provided with an LED lamp for indicating a power supply and a 3.3V voltage reducing module. The pressure information is converted into a digital signal by the air pressure sensor, and the data is transmitted to the singlechip by using the IIC protocol, so that the measurement of the pressure in the glass tube is completed. The power supply voltage of the air pressure sensor is 3.3V, and the voltage-reducing chip is used for reducing the power supply voltage of 5V to 3.3V to supply power to the air pressure sensor module.
Finally, the reception of color data will be described.
Referring to fig. 11 again, the color data receiving module 55 includes 4 self-luminous white leds to collect information of different messenger molecule concentrations.
Specifically, the molecular communication channel characterization system uses pigments as messenger molecules, so that the color data receiving area 5 uses a transparent glass tube, that is, a transparent T-shaped glass tube is arranged on the color data receiving module 55, and receives liquid color information in the transparent glass tube through a color sensor. In order to tightly fix the positions of the glass tube and the color data receiving module 55, an acryl top plate is provided at the bottom of the color data receiving module 55 to fix.
In order to reduce the influence of external light, 4 self-luminous white light emitting diode (Light Emitting Diode, LED) lamps are integrated on the color sensor module, and a fixed light source is adopted. The pigment as a messenger molecule reflects different colors in the glass region, and the higher the concentration in the glass region, the higher the light absorption intensity, and the information of the concentration of the messenger molecule (pigment) can be indirectly reflected by the color information of the color sensor according to the property. By the method for collecting color information by the color sensor, non-contact signal receiving of a receiver in a molecular communication system platform is realized.
The waste liquid collecting area 6 is mainly responsible for collecting waste liquid and can obtain the real flow rate of the molecular communication platform by measuring the weight of the waste liquid at fixed time.
The waste liquid collecting area 6 comprises a waste liquid collecting container 61 and a flow rate measuring module 62, wherein the input end of the waste liquid collecting container 61 is connected to the output end of the peristaltic pump 41, and the flow rate measuring module 62 monitors the real-time flow rate of the liquid by measuring the weight of the waste liquid.
Specifically, the water flow flows from the signal source area 1 to the waste liquid collecting area 6 after flowing through the data sampling area 5 under the drive of the peristaltic pump. The waste liquid collecting area 6 collects waste liquid using a beaker under which a flow rate measuring module 62 is installed.
Referring to fig. 12, fig. 12 is a schematic diagram of a flow rate measurement module according to an embodiment of the invention. The flow rate measuring module 62 includes a load cell, an acryl fixing plate is provided at the upper and bottom of the load cell, and the waste liquid collecting container 61 is fixed on the acryl fixing plate at the upper part of the load cell.
Specifically, the core element of the weighing sensor is a strain gauge, and the resistance value of the strain gauge can be correspondingly changed along with the change of gravity. The measuring bridge circuit formed by the strain gauge converts resistance information into voltage information, then the 24-bit digital-to-analog conversion chip is utilized to continuously transmit weight information to the singlechip through digital signals, the weight information of the beaker is sampled regularly, the precision of the calibrated weighing sensor is 0.1g, the weight divided by the time interval is flow velocity information, and the real-time flow velocity monitoring of liquid in the silica gel tube is realized.
The embodiment realizes a non-contact real-time flow velocity measurement function through the flow velocity measurement module.
It should be noted that, in this embodiment, three singlechips are provided together, modules in the electromagnetic valve data transmitting area 2, the constant temperature control area 3, and the power source area 4 are connected together to the same singlechip for control, modules in the data sampling area 5 and the waste liquid collecting area 6 are connected together to the same singlechip for control, and the constant temperature control driving module 32 is connected to one singlechip 33 for control.
Physiological parameters common to humans that have an impact on molecular communication: body temperature, blood pressure and blood flow rate, in order to reduce the influence on the flow of liquid in the pipeline as much as possible, the platform built by the embodiment realizes non-contact measurement of temperature, pressure and flow rate.
The characterization system of this embodiment has built single power source molecular communication comprehensive experiment platform through solenoid valve, constant temperature control module, peristaltic pump, has realized non-contact molecular communication data's transmission and receipt work through two temperature measurement modules, two pressure measurement modules and colour data receiving module simultaneously, has solved current molecular communication research and has not considered the molecular communication environment to the problem of communication influence, and equipment operation is simple and convenient, and the accuracy is higher.
The characterization system of the embodiment considers the influence of common physiological factors such as human body temperature, blood pressure and blood flow rate on messenger molecule diffusion, and the experimental platform obtains temperature, pressure and flow rate information by a non-contact method by arranging the temperature measuring module, the pressure measuring module and the color data receiving module on the pipeline.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (8)
1. The body area network molecular communication channel characterization system is characterized by comprising a signal source area (1), an electromagnetic valve data transmission area (2), a constant temperature control area (3), a power source area (4), a data sampling area (5) and a waste liquid collecting area (6),
the signal source region (1) comprises a first messenger molecule storage container (11), a second messenger molecule storage container (12) and a background stream storage container (13) which are arranged in parallel;
the electromagnetic valve data transmission area (2) comprises three electromagnetic valves (21) correspondingly connected with the first messenger molecule storage container (11), the second messenger molecule storage container (12) and the background stream storage container (13), and the output ends of the three electromagnetic valves (21) are connected;
the constant temperature control area (3) comprises a constant temperature control module (31), and the input end of the constant temperature control module (31) is connected with the output ends of the three electromagnetic valves (21); the constant temperature control module (31) adopts a PID algorithm to perform constant temperature control; three of said solenoid valves (21) send messenger molecules or background flow signals in the form of OOK model;
the power source area (4) comprises a peristaltic pump (41) and a peristaltic pump motor driving module (42), wherein the input end of the peristaltic pump is connected with the output end of the constant temperature control module, the peristaltic pump (41) is fixed on an acrylic plate, and the peristaltic pump motor driving module (42) is connected with the peristaltic pump (41);
the data sampling area (5) comprises a first temperature measurement module (51), a second temperature measurement module (52), a first pressure measurement module (53), a second pressure measurement module (54) and a color data receiving module (55), wherein the first temperature measurement module (51), the color data receiving module (55) and the first pressure measurement module (53) are sequentially arranged on an output pipeline of the peristaltic pump (41), a pipeline at the position of the color data receiving module (55) adopts a transparent pipeline, the second pressure measurement module (54) is arranged on the transparent pipeline, and the second temperature measurement module (52) is arranged in the environment;
the waste liquid collecting area (6) comprises a waste liquid collecting container (61) and a flow rate measuring module (62), wherein the input end of the waste liquid collecting container (61) is connected to the output end of the peristaltic pump (41), and the flow rate measuring module (62) monitors the real-time flow rate of liquid by measuring the weight of the waste liquid.
2. The body area network molecular communication channel characterization system of claim 1 wherein the first messenger molecule storage container (11) stores a bright blue pigment solution, the second messenger molecule storage container (12) stores a bright red pigment solution, and the background flow storage container (13) stores a colorless liquid.
3. The body area network molecular communication channel characterization system according to claim 1, wherein the first messenger molecule storage container (11), the second messenger molecule storage container (12) and the background flow storage container (13) are connected with three electromagnetic valves (21) in a one-to-one correspondence manner through silica gel pipelines, the output ends of the three electromagnetic valves (21) are connected through a four-way pagoda joint (22), and the output end of the four-way pagoda joint (22) is connected with the input end of the constant temperature control module (31);
the three electromagnetic valves (21) are fixed on the acrylic plate;
the three electromagnetic valves (21) are normally closed electromagnetic valves.
4. The body area network molecular communication channel characterization system according to claim 1, wherein the thermostatic control module (31) comprises a semiconductor refrigeration sheet (311), an iron sheet (312), a temperature sensor (313), a heating area (314) and an air-cooled heat sink (315), wherein the iron sheet (312) is arranged between the semiconductor refrigeration sheet (311) and the heating area (314), a portion of the iron sheet (312) is fixed with a portion of the temperature sensor (313), and the air-cooled heat sink (315) is arranged at the bottom of the semiconductor refrigeration sheet (311).
5. The body area network molecular communication channel characterization system according to claim 1, wherein the thermostatically controlled region (3) further comprises a thermostatically controlled drive module (32), an output of the thermostatically controlled drive module (32) being connected to the thermostatically controlled module (31);
the constant temperature control driving module (32) is provided with two singlechip signal inlets for respectively controlling and outputting forward voltage and reverse voltage.
6. The body area network molecular communication channel characterization system according to claim 1, wherein a magnet (43) and a hall sensor (44) are arranged on the peristaltic pump (41), wherein,
the magnet (43) is attached to the edge of the rotor of the peristaltic pump (41) to rotate along with the rotation of the peristaltic pump (41), and the Hall sensor (44) is attached to the buckle of the peristaltic pump (41) to emit high-level pulses along with the rotation of the peristaltic pump (41).
7. The body area network molecular communication channel characterization system of claim 1 wherein,
the first temperature measurement module (51) and the second temperature measurement module (52) comprise a PCB and a sensor chip positioned on the PCB, and the sensor chip adopts a sensor chip packaged in a small-shape;
the first pressure measurement module (53) comprises a touch sensor; the peristaltic pump (41) output pipeline is arranged on the touch sensor, and an acrylic cover plate is pressed on the peristaltic pump (41) output pipeline; a groove is formed at the contact part of the acrylic cover plate and the output pipeline of the peristaltic pump (41) so as to deform the output pipeline of the peristaltic pump (41);
the second pressure measurement module (54) includes a micro differential pressure sensor; the micro differential pressure sensor comprises a positive air pressure inlet and a negative air pressure inlet, the positive air pressure inlet is connected with the port of the transparent pipeline, and the negative air pressure inlet is communicated with the atmospheric pressure environment;
the color data receiving module (55) comprises 4 self-luminous white light emitting diodes to collect information of different messenger molecule concentrations.
8. The body area network molecular communication channel characterization system according to claim 1, wherein the flow rate measurement module (62) comprises a weighing sensor, wherein an acrylic fixing plate is arranged at the upper part and the bottom of the weighing sensor, and the waste liquid collection container (61) is fixed on the acrylic fixing plate at the upper part of the weighing sensor.
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