An automatic preparation system of a polyaniline optical fiber pH sensor

Abstract

The utility model relates to a kind of polyphenylamine optical fiber pH sensor automated preparation system, and a kind of pH sensor preparation device;To solve the problem of poor consistency and poor preparation efficiency in the preparation process of existing polyphenylamine optical fiber pH sensor;The novel includes three-axis motion control platform, film layer solidification unit, reaction deposition unit and control unit;Reaction deposition unit is used for the sensitive film layer deposition of the optical fiber of sensor;Film layer solidification unit is used for curing to sensitive film layer deposition;Control unit controls three-axis motion control platform to carry sensor in turn in reaction deposition unit and carries out sensitive film layer reaction deposition and in film layer solidification unit sensitive film layer solidification.The beneficial effect is to improve the purpose of preparation efficiency and consistency, reduce manual operation, improve experimental efficiency.

Description

Technical Field

[0001] This utility model relates to a pH sensor preparation device. Background Technology

[0002] The working principle of a polyaniline fiber optic pH sensor is mainly based on the interaction between a pH-sensitive film deposited on the surface of the optical fiber and hydrogen ions in the solution being measured, causing a change in refractive index or light transmission characteristics, thereby enabling pH detection. The laboratory preparation process for this type of sensor typically includes four steps: fiber pretreatment, deposition of the sensitive film, cleaning, drying, and sensor calibration testing.

[0003] In the research of polyaniline fiber optic pH sensors, in-situ polymerization is often used to deposit polyaniline coatings on the fiber surface. The morphology and density of the polyaniline film largely depend on the deposition temperature and time. Since the oxidative polymerization of aniline monomers is a strongly exothermic process, a low-temperature environment needs to be controlled to slow the polymerization rate, thereby improving the density and uniformity of the film. Therefore, effective control of the deposition temperature is necessary during the polyaniline reactive deposition process for fiber optic pH sensors. Furthermore, after film deposition, the film surface needs to be rinsed with deionized water to remove reactant residues and improve the sensing performance. Finally, the surface is dried using constant-temperature hot air. To improve the structural stability of the polyaniline film, the calibration test of the sensor usually uses a standard pH solution to establish the response relationship between pH value and changes in the sensor's optical signal. Currently, the commonly used calibration methods for fiber optic pH sensors in the laboratory are the flow cell method and the titration method. However, the preparation and calibration process of polyaniline fiber optic pH sensors in the laboratory mostly relies on manual operation, which is fragmented and inefficient. For example, each time the pH solution is changed during the calibration process, the test tank needs to be manually cleaned, which is cumbersome and time-consuming. This not only increases the experimental burden but may also reduce the consistency and stability of the sensor due to human error. Utility Model Content

[0004] The purpose of this invention is to solve the problems of poor consistency and low efficiency in the preparation of existing polyaniline fiber optic pH sensors, and to propose an automated preparation system based on polyaniline fiber optic pH sensors.

[0005] The automated preparation system based on a polyaniline fiber optic pH sensor described in this utility model includes a triaxial motion control platform, a film curing unit, a reaction deposition unit, and a control unit.

[0006] The reactive deposition unit is used to deposit a sensitive film layer on the optical fiber of the sensor;

[0007] The film curing unit is used to cure sensitive film deposits;

[0008] The control unit is used to control the three-axis motion control platform to drive the sensor to perform sensitive film reaction deposition in the reaction deposition unit and sensitive film curing in the film curing unit.

[0009] Furthermore, it also includes a cleaning unit;

[0010] The cleaning unit is used to clean the cured sensitive film layer.

[0011] Furthermore, the cleaning unit includes a drain pipe, a micro nozzle, a water pump, a liquid inlet pipe, and a cleaning tank;

[0012] The top of the cleaning tank is provided with a sensor inlet, and a miniature nozzle is provided in the middle of the cleaning tank.

[0013] The miniature nozzle is connected to the liquid inlet pipe via a water pump;

[0014] A drain hole is provided on one side of the bottom surface of the cleaning tank.

[0015] Furthermore, it also includes a sensor calibration unit;

[0016] The sensor calibration unit is used to test the prepared sensor.

[0017] Furthermore, the sensor calibration unit includes a test board, a first metal heat-conducting sheet, and a cooling device;

[0018] The test plate has six independent solution calibration slots on each side, and the solution calibration slots are arranged in a collinear or parallel manner; the solution calibration slots are used to support the sensor;

[0019] The test board has a mounting slot at the bottom;

[0020] The first metal heat-conducting sheet is fixed in the mounting groove; the first metal heat-conducting sheet is used to heat the sensor;

[0021] The cooling device is fixed to the lower part of the first metal heat-conducting plate and is used to cool the test plate.

[0022] Furthermore, the sensor calibration unit also includes thermal insulation cotton;

[0023] The insulation cotton is fixed to the bottom of the test plate.

[0024] Furthermore, this also includes stents;

[0025] The three-axis motion control platform is mounted on the top of the support frame;

[0026] The control unit is located on one side of the inner middle layer of the support; the sensor calibration unit is located near the control unit; the film curing unit is located on the other side of the inner middle layer of the support.

[0027] The cleaning unit is located between the sensor calibration unit and the film curing unit;

[0028] The reactive deposition unit is located at the lower part of the support.

[0029] Furthermore, the three-axis motion control platform includes two sliders, a lead screw slide module, a motor, a connector, an optical fiber clamp, and two guide rails;

[0030] The two guide rails are arranged parallel to each other at the top of the bracket along the length of the bracket;

[0031] The two sliders are respectively mounted on the two guide rails in a sliding connection manner;

[0032] The lead screw slide module includes a lead screw, a threaded block, a fixing component, a lifting rod, and a cylinder. The two ends of the lead screw are respectively connected to two sliders by shaft connection. The threaded block is set on the lead screw by thread connection. The fixing component is vertically fixed to the side wall of the threaded block. The lifting rod is set on the side wall of the fixing component by sliding connection. The cylinder is fixed to the top of the fixing component and can drive the top of the lifting rod to move up and down reciprocatingly.

[0033] The motor is used to drive the lead screw to rotate;

[0034] One end of the connector is fixed to the bottom end of the lifting rod, and the other end of the connector is fixed with an optical fiber clamp; the optical fiber clamp is used to hold the optical fiber of the sensor.

[0035] Furthermore, the reaction deposition unit includes a reaction deposition tank, a second metal heat-conducting plate, a temperature control device, a sealed shell, an exhaust fan, a magnetic stirring device, and a waste liquid collection device;

[0036] The reactive deposition tank is composed of an outermost supporting frame layer, a middle insulation layer, and an innermost corrosion-resistant layer.

[0037] The second metal heat-conducting sheet is disposed inside the middle insulation layer, and the second metal heat-conducting sheet is in close contact with the temperature control device;

[0038] The magnetic stirring device is located at the bottom of the reaction sedimentation tank;

[0039] The enclosed shell surrounds the outside of the reaction deposition tank;

[0040] The bottom of the reaction deposition tank has a waste liquid discharge hole;

[0041] The waste liquid collection device is located at the bottom of the reaction sedimentation tank, and the waste liquid collection port of the waste liquid collection device is connected to the waste liquid discharge port.

[0042] Furthermore, the film curing unit includes a drying housing and a PTC heating device;

[0043] The drying shell has a cuboid structure and a rectangular window is provided on the top of the drying shell;

[0044] The PTC heating device is installed on the side wall of the drying shell.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] This invention discloses an automated fabrication system for a polyaniline-based fiber optic pH sensor. It employs a three-axis motion control platform composed of three sets of lead screw slide modules. The drive system utilizes a 57-stepper motor and limit switches in conjunction with a digital micro-stepping driver. The control unit enables three-axis linkage control of the motion platform, achieving high-precision positioning and movement control in three-dimensional space, thus increasing the overall stability and reliability of the equipment. Through the coordinated operation of the three-axis motion control platform and the control unit, automatic switching between different pH buffer solutions during calibration experiments can be achieved. Furthermore, the two guide rails and the lead screw form a gantry structure, significantly improving the overall bending resistance and reducing vibration and displacement errors during movement.

[0047] The present invention discloses an automated preparation system for a polyaniline-based fiber optic pH sensor. Through the coordinated operation of a magnetic stirring device, an exhaust device, a water pump, and a PTC heating element, the system completes three key steps: film deposition, film curing, and sensor calibration. Each step and its internal procedures are strictly controlled according to a predetermined time sequence to ensure the accuracy of the process sequence. The system has the advantages of full automation and high accuracy.

[0048] The present invention discloses an automated fabrication system for a polyaniline-based fiber optic pH sensor. Through the coordinated control of a control unit and a three-axis motion control platform, the sensor fabrication and calibration process is automated. A suitable ambient temperature is provided for depositing a polyaniline coating on the fiber optic surface via a reaction deposition unit, and the dwell time of the three-axis motion control platform in each unit is controlled to achieve reasonable efficiency and consistency. During the experiment, only the pre-treated fiber structure needs to be fixed beforehand, along with some unavoidable optical path connections, greatly reducing manual operation and improving experimental efficiency. Attached Figure Description

[0049] Figure 1 This is a three-dimensional structural diagram of an automated fabrication system based on a polyaniline optical fiber pH sensor, as described in Specific Embodiment 1.

[0050] Figure 2 This is a schematic diagram of the cleaning unit in the third specific implementation method;

[0051] Figure 3 This is a three-dimensional structural diagram of the sensor calibration unit in Specific Implementation Method 5;

[0052] Figure 4 This is a schematic diagram showing the position and structure of the first metal heat-conducting sheet in the fifth specific implementation method;

[0053] Figure 5 This is a three-dimensional structural diagram of the three-axis motion control platform in Specific Implementation Method Eight;

[0054] Figure 6 This is a top view of the reactive deposition unit in Specific Implementation Method Nine;

[0055] Figure 7 This is a side view of the reactive deposition unit in Specific Implementation Method Nine;

[0056] Figure 8 This is a three-dimensional structural diagram of the film curing unit in Specific Implementation Method Ten;

[0057] Figure 9 This is a flowchart of the automated deposition and calibration timing control task in Specific Implementation Method Ten.

[0058] In the diagram, 1 is a three-axis motion control platform; 1-1 is a slider; 1-2 is a lead screw slide module; 1-3 is a motor; 1-4 is a connector; 1-5 is a fiber optic clamp; 1-6 is a guide rail; 2 is a sensor calibration unit; 2-1 is a test board; 2-2 is a solution calibration tank; 2-3 is insulation cotton; 2-4 is the first metal heat-conducting sheet; 2-5 is a cooling device; 3 is a cleaning unit; 3-1 is a drain pipe; 3-2 is a micro nozzle; 3-3 is a water pump; 3-4 is a liquid inlet pipe; 3-5 is a cleaning tank; 4 is a film curing unit; 4-1 is a drying shell; 4-2 is a PTC heating device; 5 is a reaction deposition unit; 5-1 is a reaction deposition tank; 5-2 is a waste liquid discharge hole; 5-3 is the second metal heat-conducting sheet; 5-4 is a temperature control device; 5-5 is a closed shell; 5-6 is an exhaust fan; 5-7 is a magnetic stirring device; 5-8 is a waste liquid collection device; and 6 is a control unit. Detailed Implementation

[0059] Specific Implementation Method 1: Combination Figure 1 This embodiment describes an automated fabrication system based on a polyaniline fiber optic pH sensor, comprising a three-axis motion control platform 1, a film curing unit 4, a reaction deposition unit 5, and a control unit 6.

[0060] The reactive deposition unit 5 is used to deposit a sensitive film layer on the optical fiber of the sensor;

[0061] The film curing unit 4 is used to cure the sensitive film deposits;

[0062] The control unit 6 is used to control the three-axis motion control platform 1 to drive the sensor to perform sensitive film reaction deposition in the reaction deposition unit 5 and sensitive film curing in the film curing unit 4.

[0063] In this embodiment, the three-axis motion control platform 1 is located on the top layer of the device and is used to position and move the sensors. During the assembly of the three-axis motion control platform 1, a level is used to calibrate the platform to ensure that the experimental device is level. All motor and limit switch connection cables are fixed with cable ties and suction cups, and connected to the motion control operation box on the device via two nylon drag chains in the X and Y axes. The hardware required for the experiment and the control unit 6 are all fixed on the right side of the middle layer of the device. The control unit 6 is based on embedded circuits and combined with a PLC programmable controller. A control program and human-machine interface have been written to control the movement orientation and dwell time of the three-axis motion control platform 1. The connection cable of the control unit 6 is fixed with a cable tie and suction cups and is coiled along the edge of the instrument to the left side of the middle layer of the device to connect to the control unit 6. The left side of the middle layer of the device is used to install the embedded control hardware circuit and the power supply. The actuators reach this part and are connected to the power supply and hardware circuit using terminal blocks. The bottom layer of the device is used to store the waste liquid tank and the deionized water solution. All unit connection cables are used with suction cups and cable ties and are coiled along the edge of the instrument to the left side of the middle layer of the system device to connect to the control unit 6. The three-axis motion control platform 1 operates throughout the entire process, enabling the positioning and movement of the pre-treated fiber optic structure. Under the control of the control unit 6, it sequentially completes the reaction deposition module 5, film cleaning module 3, film curing module 4, and sensor calibration module 2. During the preparation and calibration process, the control unit 6 controls the stirring, venting, cleaning, drying, and real-time environmental temperature to ensure the stability and safety of the experimental environment. The coordinated control of the control unit 6 and the three-axis motion control platform 1 automates the sensor preparation and calibration process, improving the efficiency and consistency of the preparation.

[0064] Specific Implementation Method 2: This implementation method further defines the automated preparation system based on a polyaniline optical fiber pH sensor described in Specific Implementation Method 1. In this implementation method, a cleaning unit 3 is also included.

[0065] The cleaning unit 3 is used to clean the solidified sensitive film layer.

[0066] In this embodiment, the cleaning unit 3 is used to clean the cured sensitive film layer to improve the cleanliness of the cured sensitive film layer so as not to affect the stability of the sensitive film layer.

[0067] Specific Implementation Method Three: Combination Figure 2 This embodiment further defines the automated preparation system based on a polyaniline fiber optic pH sensor described in Specific Embodiment 2. In this embodiment, the cleaning unit 3 includes a drain pipe 3-1, a micro nozzle 3-2, a water pump 3-3, a liquid inlet pipe 3-4, and a cleaning tank 3-5.

[0068] The top of the cleaning tank 3-5 is provided with a sensor inlet, and a miniature nozzle 3-2 is provided in the middle of the cleaning tank 3-5.

[0069] The micro nozzle 3-2 is connected to the liquid inlet pipe 3-4 via a water pump 3-3;

[0070] A drain hole is provided on one side of the bottom surface of the cleaning tank 3-5.

[0071] In this embodiment, such as Figure 2 As shown, the cleaning unit 3 includes a drain pipe 3-1, a miniature nozzle 3-2, a water pump 3-3, an inlet pipe 3-4, and a cleaning tank 3-5. A rectangular window is provided on the top of the cleaning tank 3-5 for the sensor to move in. The miniature water nozzle 3-2 is set and connected in the middle of the cleaning tank 3-5. The miniature water nozzle 3-2 is connected to one side of the water pump 3-3 and the inlet pipe 3-4 is connected to the other side. A circular hole is provided on the left side of the cleaning tank 3-5 to connect the drain pipe 3-1.

[0072] Specific Implementation Method 4: This implementation method further defines the automated preparation system based on polyaniline optical fiber pH sensor described in Specific Implementation Method 3. In this implementation method, a sensor calibration unit 2 is also included.

[0073] The sensor calibration unit 2 is used to test the prepared sensor.

[0074] In this embodiment, by adding a sensor calibration unit 2 to perform stability testing on the cleaned sensitive membrane layer, the sensitive membrane layer is calibrated, thereby improving the success rate of preparing the sensitive membrane layer for the polyaniline fiber optic pH sensor.

[0075] Specific Implementation Method Five: Combination Figures 3 to 4 This embodiment further defines the automated preparation system for a polyaniline fiber optic pH sensor described in Specific Embodiment 4. In this embodiment, the sensor calibration unit 2 includes a test plate 2-1, a first metal heat-conducting sheet 2-4, and a cooling device 2-5.

[0076] The test plate 2-1 has six independent solution calibration tanks 2-2 on each side, and the solution calibration tanks 2-2 are arranged in a collinear or parallel manner; the solution calibration tanks 2-2 are used to support the sensor;

[0077] The bottom of test board 2-1 is provided with a mounting slot;

[0078] The first metal heat-conducting sheet 2-4 is fixed in the mounting groove; the first metal heat-conducting sheet 2-4 is used to heat the sensor;

[0079] The cooling device 2-5 is fixed to the lower part of the first metal heat-conducting plate 2-4, and the cooling device 2-5 is used to cool the test plate 2-1.

[0080] In this embodiment, the test plate 2-1 has 12 solution calibration tanks 2-2, each containing a solution with a different pH value. A fiber optic sensor is mounted on the fiber optic clamp, and the three-axis motion platform 1 moves the sensor to different pH values ​​to complete the test of the solution. The bottom of the test plate 2-1 is slotted to fix the metal heat-conducting plate 2-4. The cooling device 2-5 is located below the metal heat-conducting plate 2-4, and the sensor calibration unit 2 is embedded into the experimental platform support through the fixing slot, ensuring that the sensor can be accurately positioned and moved into the target solution tank, thus ensuring the stability of the automated calibration experiment.

[0081] Specific Implementation Method Six: This implementation method further defines the automated preparation system based on polyaniline optical fiber pH sensor described in Specific Implementation Method Five. In this implementation method, the sensor calibration unit 2 further includes insulation cotton 2-3.

[0082] The thermal insulation cotton 2-3 is fixed below the test plate 2-1.

[0083] In this embodiment, the thermal insulation performance of the test plate 2-1 is improved by adding thermal insulation cotton 2-3, thereby improving the accuracy of calibration.

[0084] Specific Implementation Method Seven: This implementation method further defines the automated preparation system based on polyaniline optical fiber pH sensor described in Specific Implementation Method Four. In this implementation method, a support 7 is also included.

[0085] The three-axis motion control platform 1 is mounted on the top of the support 7;

[0086] The control unit 6 is located on one side of the inner middle layer of the support 7; the sensor calibration unit 2 is located near the control unit 6; the film curing unit 4 is located on the other side of the inner middle layer of the support 7.

[0087] The cleaning unit 3 is disposed between the sensor calibration unit 2 and the film curing unit 4;

[0088] The reactive deposition unit 5 is located at the lower part of the support 7.

[0089] In this embodiment, the main function of the bracket 7 is to provide a support platform for the three-axis motion control platform 1, the film curing unit 4, and the reaction deposition unit 5, so as to ensure the reasonable layout of each functional unit; the installation and operation of all units rely on the bracket 7 to ensure the overall stability and operability of the system.

[0090] Detailed Implementation Method 8: Combination Figure 5 This embodiment further defines the automated preparation system based on a polyaniline optical fiber pH sensor described in Specific Embodiment Seven. In this embodiment, the three-axis motion control platform 1 includes two sliders 1-1, a lead screw slide module 1-2, a motor 1-3, a connector 1-4, an optical fiber clamp 1-5, and two guide rails 1-6.

[0091] The two guide rails 1-6 are arranged parallel to each other at the top of the bracket 7 along the length of the bracket 7;

[0092] The two sliders 1-1 are respectively mounted on the two guide rails 1-6 in a sliding connection manner;

[0093] The lead screw slide module 1-2 includes a lead screw, a threaded block, a fixing component, a lifting rod, and a cylinder. The two ends of the lead screw are respectively connected to two sliders 1-1 by shaft connection. The threaded block is set on the lead screw by thread connection. The fixing component is vertically fixed on the side wall of the threaded block. The lifting rod is set on the side wall of the fixing component by sliding connection. The cylinder is fixed on the top of the fixing component and can drive the top of the lifting rod to move up and down reciprocatingly.

[0094] The motors 1-3 are used to drive the lead screw to rotate;

[0095] One end of the connector 1-4 is fixed to the bottom end of the lifting rod, and the other end of the connector 1-4 is fixed with an optical fiber clamp 1-5; the optical fiber clamp 1-5 is used to clamp the optical fiber of the sensor.

[0096] In this embodiment, the length direction of the guide rail 1-6 in the three-axis motion control platform 1 is the X-axis direction; the length direction of the lead screw is the Y-axis direction; the length direction of the lifting rod is the Z-axis direction; the motor 1-3 is located at the starting end of the X-axis, Y-axis and Z-axis of the three-axis motion control platform 1, and is fixed by a cable tie and a suction cup, and is connected to the mobile control operation box on the device through two nylon drag chain tracks in the X-axis and Y-axis directions. The two guide rails 1-6 and the lead screw form a gantry structure. The connector 1-4 is fixed at the end of the Z-axis and connected to the fiber optic clamp 1-5. The slider 1-1 is located at the starting end of the auxiliary rail 1-6 on the opposite side of the Y-axis. The lead screw slide module 1-2 of the Y-axis and the auxiliary rail 1-6 can make the three-axis motion control platform 1 more stable when sliding as a whole, which increases the stability when used for automated calibration.

[0097] The control system of the three-axis motion control platform 1 uses the control unit 6 to drive the stepper motor for point-to-point control and trajectory planning, so as to achieve high-precision and stable motion. The motion controller undertakes key tasks such as trajectory planning and speed control. It controls the rotation angle and direction of the stepper motor by outputting high-speed pulse signals (PUL) and direction signals (DIR), and receives limit switch signals through I / O signals to prevent the motor from overtravel.

[0098] Detailed Implementation Method Nine: Combination Figure 6 and Figure 7 This embodiment further defines the automated preparation system based on a polyaniline fiber optic pH sensor described in Specific Embodiment Eight. In this embodiment, the reaction deposition unit 5 includes a reaction deposition tank 5-1, a second metal heat-conducting plate 5-3, a temperature control device 5-4, a closed shell 5-5, an exhaust fan 5-6, a magnetic stirring device 5-7, and a waste liquid collection device 5-8.

[0099] The reactive deposition tank 5-1 is composed of an outermost supporting frame layer, a middle insulation layer, and an innermost corrosion-resistant layer.

[0100] The second metal heat-conducting sheet 5-3 is disposed in the middle insulation layer, and the second metal heat-conducting sheet 5-3 is tightly attached to the temperature control device 5-4;

[0101] The magnetic stirring device 5-7 is installed at the bottom of the reaction sedimentation tank 5-1;

[0102] The enclosed shell 5-5 surrounds the outside of the reaction deposition tank 5-1;

[0103] The bottom of the reaction deposition tank 5-1 is provided with a waste liquid discharge hole 5-2;

[0104] The waste liquid collection device 5-8 is located at the bottom of the reaction sedimentation tank 5-1, and the waste liquid collection port of the waste liquid collection device 5-8 is connected to the waste liquid discharge through hole 5-2.

[0105] In this embodiment, the reaction deposition tank 5-1 consists of a three-layer composite structure. The outer layer of the reaction deposition tank 5-1 uses an acrylic plate as a high-strength support frame; the middle layer is composed of insulating cotton sandwiching a metal heat-conducting sheet 5-3; the temperature control device 5-4 is tightly fitted with the metal heat-conducting sheet 5-3 to achieve efficient temperature control; the innermost layer of the reaction deposition tank 5-1 is made of highly acid and alkali resistant polyvinyl chloride material to meet the requirements of long-term contact with strong acid solutions. In addition, one side of the inner tank body of the reaction deposition tank 5-1 is thinned and tightly fitted with a metal heat-conducting sheet, while the other side of the metal heat-conducting sheet 5-3 is tightly fitted with a high-power cooling plate. A magnetic stirring device 5-7 is designed at the bottom of the reaction deposition tank 5-1. This device consists of a stirring motor, a stir bar, and a motor control module. The magnetic force generated by the magnetic stirring device 5-7 can drive the stir bar inside the reaction deposition tank 5-1 to rotate, allowing the solution to fully mix.

[0106] An enclosed shell 5-5 is added to the outside of the reaction deposition tank 5-1, and the gaseous byproducts generated during the reaction are discharged through a PVC pipe connected to an exhaust fan 5-6. In addition, the enclosed shell 5-5 effectively improves the heat preservation effect of the entire module.

[0107] Waste liquid collection devices 5-2 and 5-8 are installed at the bottom of the reaction deposition module 5 and connected to the reaction deposition tank 5-1 through PVC pipes. After the reaction is completed, the reaction waste liquid is collected into the waste liquid collection bucket.

[0108] Detailed Implementation Method 10: Combination Figure 8 and Figure 9 This embodiment further defines the automated preparation system based on a polyaniline fiber optic pH sensor described in Specific Embodiment Nine. In this embodiment, the film curing unit 4 includes a drying housing 4-1 and a PTC heating device 4-2.

[0109] The drying shell 4-1 has a cuboid structure; and a rectangular window is provided on the top of the drying shell 4-1.

[0110] The PTC heating device 4-2 is installed on the side wall of the drying shell 4-1.

[0111] The hardware circuit framework is mainly divided into two aspects: ambient temperature detection and control, and actuator control for the fabrication and calibration process.

[0112] For ambient temperature detection and control, a software-based PID temperature regulation method is employed. The operation involves collecting temperature data from a temperature sensor and inputting it into the PID control algorithm. Based on the real-time temperature, the duty cycle of the PWM signal is dynamically adjusted, which in turn controls the power output by regulating the operating status of the TEC semiconductor cooling chip and exhaust fan 5-6 through the drive circuit, thereby controlling the temperature. In terms of the actuator control for the preparation and calibration process, the sensor film deposition and curing processes are designed into this system. Residual gases generated during the experiment are discharged by the corresponding exhaust fan 5-6. The addition of deionized water is accomplished using a water pump 3-3 and a micro-nozzle 3-2, while the film drying is provided by a PTC heating element 4-2.

[0113] like Figure 9 As shown, the automated fabrication process of a polyaniline-based fiber optic pH sensor includes three key steps: film deposition, film curing, and sensor calibration. This is achieved through the coordinated operation of a magnetic stirrer 5-7, an exhaust fan 5-6, a water pump 3-3, and a PTC heating element 4-2. Each step and its internal procedures are strictly controlled according to a predetermined time sequence to ensure the accuracy of the process order. During task execution, the automated program needs to wait for a signal trigger before execution, and then coordinates the steps according to a strict time sequence. The specific process is as follows: After the reaction solution is injected, the magnetic stirrer 5-7 starts to promote the initial mixing of the reaction solution, and the exhaust fan 5-6 starts to remove residual gas. After the fiber undergoes a period of acidification, the stirrer is turned off, and ammonium persulfate solution is added to begin polymerization. Until the specified polymerization time is reached, the exhaust fan 5-6 is turned off, and then film cleaning, film drying, and sensor calibration control are completed sequentially.

[0114] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An automated fabrication system based on a polyaniline fiber optic pH sensor, characterized in that, It includes a three-axis motion control platform (1), a film curing unit (4), a reaction deposition unit (5), and a control unit (6). The reactive deposition unit (5) is used to deposit a sensitive film layer on the optical fiber of the sensor; The film curing unit (4) is used to cure the sensitive film deposits; The control unit (6) is used to control the three-axis motion control platform (1) to drive the sensor to perform sensitive film reaction deposition in the reaction deposition unit (5) and sensitive film curing in the film curing unit (4).

2. The automated fabrication system based on a polyaniline fiber optic pH sensor according to claim 1, characterized in that, It also includes a cleaning unit (3); The cleaning unit (3) is used to clean the solidified sensitive film layer.

3. The automated fabrication system based on a polyaniline fiber optic pH sensor according to claim 2, characterized in that, The cleaning unit (3) includes a drain pipe (3-1), a micro nozzle (3-2), a water pump (3-3), an inlet pipe (3-4), and a cleaning tank (3-5). The cleaning tank (3-5) has a sensor inlet at the top and a miniature nozzle (3-2) in the middle. The micro nozzle (3-2) is connected to the liquid inlet pipe (3-4) via a water pump (3-3); A drain hole is provided on one side of the bottom surface of the cleaning tank (3-5).

4. The automated fabrication system based on a polyaniline fiber optic pH sensor according to claim 3, characterized in that, It also includes a sensor calibration unit (2); The sensor calibration unit (2) is used to test the prepared sensor.

5. The automated fabrication system based on a polyaniline fiber optic pH sensor according to claim 4, characterized in that, The sensor calibration unit (2) includes a test board (2-1), a first metal heat-conducting sheet (2-4), and a cooling device (2-5). The test plate (2-1) has six independent solution calibration tanks (2-2) on each side. The solution calibration tanks (2-2) are arranged in a collinear or parallel manner. The solution calibration tanks (2-2) are used to support the sensor. The bottom of the test board (2-1) is provided with a mounting slot; The first metal heat-conducting sheet (2-4) is fixed in the mounting groove; the first metal heat-conducting sheet (2-4) is used to heat the sensor; The cooling device (2-5) is fixed to the lower part of the first metal heat-conducting plate (2-4), and the cooling device (2-5) is used to cool the test plate (2-1).

6. The automated fabrication system for a polyaniline fiber optic pH sensor according to claim 5, characterized in that, The sensor calibration unit (2) also includes thermal insulation cotton (2-3); The insulation cotton (2-3) is fixed below the test plate (2-1).

7. The automated fabrication system for a polyaniline fiber optic pH sensor according to claim 6, characterized in that, It also includes a support (7); The three-axis motion control platform (1) is set at the top of the support (7); The control unit (6) is located on one side of the inner middle layer of the bracket (7); the sensor calibration unit (2) is located near the control unit (6); the film curing unit (4) is located on the other side of the inner middle layer of the bracket (7); The cleaning unit (3) is located between the sensor calibration unit (2) and the film curing unit (4); The reactive deposition unit (5) is located at the lower part of the support (7).

8. The automated fabrication system based on a polyaniline fiber optic pH sensor according to claim 7, characterized in that, The three-axis motion control platform (1) includes two sliders (1-1), a lead screw slide module (1-2), a motor (1-3), a connector (1-4), an optical fiber clamp (1-5), and two guide rails (1-6). The two guide rails (1-6) are arranged parallel to each other at the top of the bracket (7) along the length direction of the bracket (7); The two sliders (1-1) are respectively mounted on the two guide rails (1-6) in a sliding connection manner; The lead screw slide module (1-2) includes a lead screw, a threaded block, a fixing component, a lifting rod, and a cylinder; the two ends of the lead screw are respectively connected to two sliders (1-1) by shaft connection; the threaded block is set on the lead screw by thread connection; the fixing component is vertically fixed on the side wall of the threaded block; the lifting rod is set on the side wall of the fixing component by sliding connection; the cylinder is fixed on the top of the fixing component, and the cylinder can drive the top of the lifting rod to move up and down reciprocatingly; The motors (1-3) are used to drive the lead screw to rotate; One end of the connector (1-4) is fixed to the bottom end of the lifting rod, and the other end of the connector (1-4) is fixed with an optical fiber clamp (1-5); the optical fiber clamp (1-5) is used to clamp the optical fiber of the sensor.

9. The automated fabrication system based on a polyaniline fiber optic pH sensor according to claim 8, characterized in that, The reaction deposition unit (5) includes a reaction deposition tank (5-1), a second metal heat-conducting plate (5-3), a temperature control device (5-4), a closed shell (5-5), an exhaust fan (5-6), a magnetic stirring device (5-7), and a waste liquid collection device (5-8). The reactive deposition tank (5-1) is composed of an outermost supporting frame layer, a middle insulation layer, and an innermost corrosion-resistant layer. The second metal heat-conducting sheet (5-3) is disposed in the middle insulation layer, and the second metal heat-conducting sheet (5-3) is in close contact with the temperature control device (5-4); The magnetic stirring device (5-7) is installed at the bottom of the reaction sedimentation tank (5-1); The enclosed shell (5-5) surrounds the outside of the reaction deposition tank (5-1); The bottom of the reaction deposition tank (5-1) has a waste liquid discharge hole (5-2). The waste liquid collection device (5-8) is located at the bottom of the reaction sedimentation tank (5-1), and the waste liquid collection port of the waste liquid collection device (5-8) is connected to the waste liquid discharge through hole (5-2).

10. The automated fabrication system for a polyaniline fiber optic pH sensor according to claim 9, characterized in that, The film curing unit (4) includes a drying shell (4-1) and a PTC heating device (4-2). The drying shell (4-1) has a cuboid structure; and a rectangular window is provided on the top of the drying shell (4-1); The PTC heating device (4-2) is installed on the side wall of the drying shell (4-1).

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