Optical fiber blackbody cavity temperature sensing system and manufacturing method thereof

Abstract

The application discloses a kind of production methods of optical fiber blackbody cavity temperature sensing system, belong to optical fiber blackbody cavity temperature sensing technical field.This method includes the following steps: using chemical plating film method to produce optical fiber blackbody probe, the probe end of the optical fiber blackbody probe is embedded in turbine stator using 3D printing;Weak light signal processing integrated circuit connected with the optical fiber end of the optical fiber blackbody probe is constructed and is integrally encapsulated;Weak light signal processing integrated circuit transmits electrical signal to single-chip microcomputer, obtains optical fiber blackbody cavity temperature sensing system.The application overcomes the technical blockade of foreign extreme environment sensing field, brings new scheme and attempt for undisturbed flow temperature monitoring under severe working condition.Saves simulation, test and other costs for the development of aero-engine, improves engine development rate, and promotes engine technology development.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical fiber blackbody cavity temperature sensing, and relates to an optical fiber blackbody cavity temperature sensing system and a manufacturing method thereof. BACKGROUND

[0002] In recent years, with the rapid development of global air transportation industry, the performance requirements of aircraft engines have risen to an unprecedented height. Temperature, as one of the core indicators to measure the running state of the engine, its accurate monitoring and prediction ability is directly related to flight safety, efficiency and economy. During the operation of the aircraft engine, it will experience complex working condition changes from low temperature start to high temperature and high speed operation. Temperature, as one of the core parameters in this process, directly reflects the internal combustion efficiency, heat transfer efficiency and mechanical load state of the engine. Scientific and accurate monitoring and prediction of the temperature change of the aircraft engine can not only timely discover potential thermal damage risk and avoid component failure or failure due to overheating, but also optimize the combustion control strategy according to the real-time temperature data, improve fuel efficiency and thrust output, thereby improving the engine performance without sacrificing safety.

[0003] However, the traditional aircraft engine temperature sensing probe is not up to the challenge. On the one hand, the upper limit of the temperature resistance of the traditional sensor is low, which is difficult to work stably in the extreme high temperature environment inside the engine for a long time. On the other hand, in order to realize high-precision measurement, the sensor often needs a larger volume to accommodate complex sensing elements and signal processing circuits, which not only increases the difficulty and cost of engine design, but also limits the integrated application of the sensor in a small space. Moreover, the installation position and shape design of the traditional probe are often not fine enough, which is easy to introduce disturbance in the high-speed airflow and affect the accuracy of the measurement results. Therefore, the traditional aircraft engine temperature sensing probe is generally large in size and difficult to realize miniaturization and integration, has a low upper limit of temperature resistance, and is easy to introduce disturbance, which cannot meet the actual measurement needs of the engine. SUMMARY

[0004] The purpose of the present application is to solve the technical problems of the existing aircraft engine temperature sensing probe, which is generally large in size and difficult to realize miniaturization and integration, has a low upper limit of temperature resistance, and is easy to introduce disturbance, and to provide an optical fiber blackbody cavity temperature sensing system and a manufacturing method thereof.

[0005] In order to achieve the above purpose, the technical scheme is adopted as follows:

[0006] In a first aspect, the present application provides a manufacturing method of an optical fiber blackbody cavity temperature sensing system, comprising the following steps:

[0007] The optical fiber blackbody probe is manufactured by using chemical plating film method, and the probe end of the optical fiber blackbody probe is embedded in the turbine stator by 3D printing;

[0008] constructing a weak light signal processing integrated circuit connected with the fiber end of the fiber black body probe and integrally packaging the same;

[0009] The weak light signal processing integrated circuit transmits an electrical signal to a single-chip microcomputer to obtain a fiber black body cavity temperature sensing system.

[0010] Further improvements are that:

[0011] The fiber black body probe made by using the chemical plating film method comprises:

[0012] A plating film colloid mixture is made, and the optical fiber is inserted into the plating film colloid mixture, slowly pulled up to wrap the surface with a layer of colloid, and then placed in the air for 5-10 minutes to form a layer of obvious white opaque solid on the surface of the optical fiber. Then the film layer is repeatedly burned with a butane flame torch, each time for 5-15 seconds, and repeated 4-5 times. During the process, it is observed that the film layer first becomes transparent and then turns into a white solid. After that, the film layer does not change when burned again, and a black body cavity layer is obtained. The thickness of the film layer is 0.05-2 microns. The following reaction occurs to make the fiber black body probe:

[0013] 2Al(OH)3+Mg(OH)2+ΔT→MgAl2O4.

[0014] The plating film colloid mixture is made specifically by:

[0015] Magnesium aluminate spinel powder is dissolved in boiling water until there is solid residue, forming a saturated solution, and the following reaction occurs:

[0016] Al(OR)3+H2O→Al(OR)2OH+ROH↑

[0017] Mg(OR)2+H2O→Mg(OR)OH+ROH↑

[0018] Wherein, R represents a hydrocarbon compound;

[0019] After the reaction is complete, the container in which the above reaction occurs is placed in an ice water bath to cool and separate the reaction product. The upper liquid is removed, and the lower layer produces a partial gel-like material. The following reaction occurs to make the plating film colloid mixture:

[0020] Al(OR)(OH)2+H2O→Al(OH)3+ROH↑

[0021] Mg(OR)OH+H2O→Mg(OH)2+ROH↑.

[0022] The probe end of the fiber black body probe is embedded in the turbine stator by 3D printing, specifically including:

[0023] designing a reserved hole and establishing a three-dimensional model of the turbine stator based on the reserved hole;

[0024] 3D printing based on the three-dimensional model;

[0025] When the reserved hole is printed, the probe end of the optical fiber is pressed into the bottom of the hole, and the metal powder used for printing is laid on the probe end of the optical fiber to press it tightly in the reserved hole.

[0026] The reserved hole is a waist-shaped hole with a circular arc diameter of 0.5-1mm and a length of 1.5-2mm.

[0027] The 3D printing uses laser selective melting technology, and the 3D printing is completed within 10 minutes.

[0028] The weak light signal processing integrated circuit connected with the optical fiber end of the optical fiber blackbody probe comprises:

[0029] The optical fiber end of the optical fiber blackbody probe is connected to a photosensitive resistor in a photoelectric conversion circuit, and the photoelectric conversion circuit is sequentially connected with a multi-stage amplification circuit and a rectification filtering circuit to form a weak light signal processing integrated circuit.

[0030] In the second aspect, the application provides an optical fiber blackbody cavity temperature sensing system prepared by the above method, which comprises an optical fiber blackbody probe, the probe end of the optical fiber blackbody probe is embedded in a turbine stator, and the optical fiber end of the optical fiber blackbody probe is connected with a photosensitive resistor in the weak light signal processing integrated circuit; the weak light signal processing integrated circuit comprises a photoelectric conversion circuit, a multi-stage amplification circuit and a rectification filtering circuit connected in sequence; the weak light signal processing integrated circuit converts an optical signal into an electrical signal, amplifies and filters the electrical signal, and then transmits the electrical signal to a single-chip microcomputer; the single-chip microcomputer converts the electrical signal into a temperature value and inputs the temperature value to a digital tube to display the temperature value.

[0031] Compared with the prior art, the application has the following beneficial effects:

[0032] The application discloses a manufacturing method of a fiber blackbody cavity temperature sensing system, a probe end of a prepared fiber blackbody probe is embedded in a turbine stator by 3D printing, and a weak light signal processing integrated circuit connected with a fiber end of the fiber blackbody probe is constructed, the weak light signal processing integrated circuit transmits an electric signal to a single-chip microcomputer, and the single-chip microcomputer converts the received electric signal into a temperature value and outputs the temperature value. Firstly, the fiber sensing technology has advantages of high temperature resistance, high pressure resistance, easy integration, oxidation resistance, corrosion resistance, good insulation, electromagnetic interference resistance and real-time measurement, and is suitable for working in a severe environment such as flammable and explosive, strong magnetic field interference and high temperature and high pressure. Secondly, the probe end of the fiber blackbody probe is embedded in the turbine stator by 3D printing, so that the technical problem that the installation position and shape design of a traditional probe are often not fine enough and are easy to introduce turbulence in high-speed airflow is solved, and temperature detection is more accurate. Finally, the design of the weak light signal processing integrated circuit overcomes the defect of difficult weak signal acquisition, inputs a light signal into a photoelectric conversion circuit, so that the light signal can be converted into an electric signal, the output end of the photoelectric conversion circuit is connected with an input end of a multi-stage amplification and filtering circuit, the weak electric signal is amplified and filtered to be a usable electric signal, then the electric signal is output into the single-chip microcomputer, and accurate display of a temperature value is realized. The application breaks through the technical blockade of foreign countries in the field of extreme environment sensing, brings a new scheme and attempt for turbulence-free temperature monitoring in a severe working condition, saves simulation and test costs for development of an aero-engine, improves engine development speed, and promotes development of engine technology. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 The flow chart of the manufacturing method of the fiber blackbody cavity temperature sensing system in the present application;

[0035] Figure 2 The detailed step diagram of the manufacturing method of the fiber blackbody cavity temperature sensing system in the present application;

[0036] Figure 3 The turbine stator structure diagram in the fiber blackbody cavity temperature sensing system in the present application;

[0037] Figure 4 The fiber blackbody probe structure schematic diagram in the fiber blackbody cavity temperature sensing system in the present application;

[0038] Figure 5 A module diagram of an optical signal processing integrated circuit in a fiber blackbody cavity temperature sensing system.

[0039] 1-turbine stator; 2-magnesium-aluminum mixed film; 3-optical fiber. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0044] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0045] In the description of the embodiments of the present application, it also needs to be explained that, unless explicitly specified and limited, if the terms of "setting", "installing", "connecting", "connecting" appear, they should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrally connected, can be mechanically connected, can also be electrically connected, can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The present application will be further described in detail below in combination with the drawings:

[0047] Referring to Figure 1 The embodiment of the present application discloses a manufacturing method of an optical fiber blackbody cavity temperature sensing system, comprising the following steps:

[0048] S1, using a chemical plating film method to manufacture an optical fiber blackbody probe, embedding a probe end of the optical fiber blackbody probe into a turbine stator by using 3D printing;

[0049] S2, constructing a weak light signal processing integrated circuit connected with an optical fiber end of the optical fiber blackbody probe and integrally packaging the same;

[0050] S3, the weak light signal processing integrated circuit transmits an electric signal to a single-chip microcomputer to obtain an optical fiber blackbody cavity temperature sensing system.

[0051] The application discloses a manufacturing method of an optical fiber blackbody cavity temperature sensing system, a probe end of a prepared optical fiber blackbody probe is embedded in a turbine stator by 3D printing, and an optical signal processing integrated circuit connected with a fiber end of the optical fiber blackbody probe is constructed; the optical signal processing integrated circuit transmits an electric signal to a single-chip microcomputer; a program for converting the received electric signal into a temperature value in the single-chip microcomputer is designed; firstly, the optical fiber sensing technology has advantages of high temperature resistance, high pressure resistance, easy integration, oxidation resistance, corrosion resistance, good insulation, electromagnetic interference resistance and real-time measurement, and is suitable for working in severe environments such as flammable and explosive environments, strong magnetic field interference and high temperature and high pressure; secondly, the probe end of the optical fiber blackbody probe is embedded in the turbine stator by 3D printing, thereby solving the technical problem that the installation position and shape design of a traditional probe are often not fine enough and are easy to introduce turbulence in high-speed airflow, and making temperature detection more accurate; finally, the design of the optical signal processing integrated circuit overcomes the defect of difficult weak signal collection, inputs an optical signal into a photoelectric conversion circuit, so that the optical signal can be converted into an electric signal, the output end of the photoelectric conversion circuit is connected with an input end of a multi-stage amplification and filtering circuit, the weak electric signal is amplified and filtered to be a usable electric signal, then the electric signal is output into the single-chip microcomputer, a function relationship between a temperature value and a square root of a voltage value is utilized to perform numerical conversion, and finally, after a fixed coefficient, accurate display of the temperature value is realized. The application breaks through the technical blockade of foreign countries in the field of extreme environment sensing, brings a new scheme and attempt for turbulence-free temperature monitoring in severe working conditions, saves simulation and test costs for development of an aero-engine, improves engine development speed, and promotes development of engine technology.

[0052] The application is described below in combination with specific embodiments, referring to Figure 2 and Figure 3 :

[0053] Step one, the optical fiber blackbody probe is made by using a chemical plating film method.

[0054] (1) Firstly, cutting of the optical fiber end face must be inspected to ensure flatness and cleanliness.

[0055] The coating layer is removed. The optical fiber used in the application is bare fiber and only has a coating layer. Firstly, the coating layer away from the cutting end of the optical fiber is stripped by using a Miller clamp, then the optical fiber is wiped with alcohol-dipped absorbent cotton to remove residues on the coating layer and clean the surface.

[0056] (2) About 5g of magnesium aluminate spinel powder is added into a test tube, about 10ml of 100 DEG C boiling water is further added, the test tube is shaken to disperse the magnesium aluminate spinel powder, so that the magnesium aluminate spinel powder fully reacts with the boiling water, the process is repeated three to four times until there is solid residue, a saturated solution is formed, and the reaction is as follows:

[0057] Al(OR)3 + H2O → Al(OR)2OH + ROH↑

[0058] Mg(OR)2 + H2O → Mg(OR)OH + ROH↑

[0059] where R represents a hydrocarbon,

[0060] After the reaction is complete, the test tube is placed in an ice water bath to cool the reaction product, the upper liquid is removed with a dropper, and the lower layer produces a partially gelatinous material, which is reacted as follows to produce a colloidal mixture.

[0061] Al(OR)(OH)2 + H2O → Al(OH)3 + ROH↑

[0062] Mg(OR)OH + H2O → Mg(OH)2 + ROH↑

[0063] (3) The quartz optical fiber with the surface protective layer removed is inserted into the semi-gelatinous solid, and is slowly pulled upward to wrap the surface with a layer of gelatinous material. After the optical fiber is left to stand in the air for 5-10 minutes, a layer of obvious white opaque solid is formed on the surface, and then the film layer is repeatedly burned with a butane flame torch for 5-15 seconds each time, and the process is repeated 4-5 times. During the process, it can be observed that the film layer first becomes transparent and then turns into a white solid, and then the film layer does not change after being burned again, and a blackbody cavity layer is obtained, the thickness of the film layer is 0.05 μm-2 μm, and the optical fiber blackbody probe is prepared as shown in the following formula: Figure 4 The outer side of one end of the optical fiber 3 is wrapped with a layer of magnesium-aluminum mixed film 2.

[0064] 2Al(OH)3 + Mg(OH)2 + ΔT → MgAl2O4

[0065] Step two, the probe end of the optical fiber blackbody probe is embedded in the turbine stator using 3D printing.

[0066] (1) Design of reserved hole and establishment of model. A 3D printing model is made using SOLIDWORK software, and a waist-shaped hole with a circular arc diameter of 0.7 mm and a length of 1.68 mm is selected as our reserved hole. The reserved hole is arranged on the outer side of the turbine stator 1, and the turbine stator 1 is installed to facilitate the extraction of the optical fiber from the gap between the shells and the realization of circuit connection.

[0067] (2) 3D printing of the model. Laser selective melting technology (SLM) is used for metal 3D printing.

[0068] Laser selective melting technology can well control the melting area, the speed and time of melting, and ensure the accurate printing of metal parts and the accurate embedding of the optical fiber. The specific process includes:

[0069] The model is established by using specific software, and the parameters of the model are consistent with the number of parts to be made. These data will be effectively sliced and layered before entering the equipment for formal manufacturing.

[0070] The printing equipment also analyzes the material and adds scanning lines according to the specific characteristics of the model and the different types of materials. These scanning lines can better support the subsequent laser beam selection operation and ensure the accuracy of the data.

[0071] During printing, the device first lays out the metal powder, then melts it according to the scanning lines designed by the software, and uses this repeated operation to build the required material. At the same time, our reserved hole will be printed out, and after the reserved hole is printed, the optical fiber will be pressed into the bottom of the hole as much as possible, and the metal powder used for printing will be laid out to cover the optical fiber and press it tightly in the reserved hole. At the same time, the turbine stator model is placed on one side of the printing cabin during the printing process to better place the optical fiber tail. The above operation process needs to be completed within ten minutes, otherwise the inert gas atmosphere will be lost due to the long opening time of the cabin, the metal powder will be contaminated, and the model will be printed with defects.

[0072] Step three, build and encapsulate the optical signal processing integrated circuit connected to the optical fiber end of the optical fiber blackbody probe. Design the program in the single-chip microcomputer to convert the received electrical signal into a temperature value, and complete the production of the optical fiber blackbody cavity temperature sensing system.

[0073] (1) Design and production of photoelectric conversion module, as shown in Figure 5 The end of the optical fiber is in contact with the photosensitive resistor, and the photoelectric conversion circuit is designed. Then, through multiple stages of amplification circuit and rectification filter circuit, the optical signal is converted into weak electrical signal and amplified and filtered.

[0074] (2) Data processing and display of signal. The amplified and filtered electrical signal is input into the Arduino single-chip microcomputer. In the single-chip microcomputer program, there is a functional relationship between the electrical signal voltage value x and the temperature value t: (c is the temperature coefficient), the input analog quantity is functionally transformed and input into the digital tube for numerical display, which completes the data processing and display of the weak optical signal.

[0075] (3) Calibration of temperature coefficient. The standard part embedded in the optical fiber is placed in a high-temperature furnace for temperature indication calibration. According to the standard thermocouple of the high-temperature furnace as the standard parameter, at this time, the temperature coefficient c is the coefficient to be determined, adjust the coefficient to be determined in the program, so that the display temperature of the digital tube is constantly close to the temperature display of the standard thermocouple. When the digital tube display and the standard thermocouple display are equal, the coefficient to be determined at this time is the temperature coefficient c we are looking for.

[0076] (4) design weak light signal photoelectric conversion, filter amplification, data processing and display integrated circuit, we will ultimately above-mentioned circuit package, realize integration design, in this way adapt to multiple working environment, and improve system stability and durability.

[0077] The embodiment of the present application further discloses a fiber blackbody cavity temperature sensing system prepared by the method, comprising a fiber blackbody probe, a probe end of the fiber blackbody probe is embedded into a turbine stator, and a fiber end of the fiber blackbody probe is connected with a photosensitive resistor in the weak light signal processing integrated circuit; the weak light signal processing integrated circuit comprises photoelectric conversion circuit, multi-stage amplification circuit and rectification filter circuit which are connected in sequence; the weak light signal processing integrated circuit converts the optical signal into an electric signal, amplifies and filters the electric signal, and then transmits the electric signal to a single-chip microcomputer; the single-chip microcomputer converts the electric signal into a temperature value and inputs the temperature value into a number tube to display the temperature value.

[0078] The above only for the preferred embodiment of the present application, and does not limit the present application, for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of making a fiber-optic blackbody cavity temperature sensing system, comprising: Includes the following steps: The fiber optic blackbody probe is fabricated using a chemical coating method, and the probe end of the fiber optic blackbody probe is embedded into the turbine stator using 3D printing. Construct an integrated circuit for weak light signal processing that is connected to the optical fiber end of the optical fiber blackbody probe and package it as a whole; The integrated circuit for weak optical signal processing transmits the electrical signal to the microcontroller to obtain the fiber optic blackbody cavity temperature sensing system. The fabrication of the fiber optic blackbody probe using chemical coating includes: A coating colloidal mixture is prepared, and an optical fiber is inserted into the mixture. The fiber is slowly pulled upwards to coat its surface with a layer of the colloidal mixture. After standing in air for 5-10 minutes, a distinct white, opaque solid layer forms on the fiber surface. The film layer is then repeatedly burned with a butane flame torch for 5-15 seconds each time, repeated 4-5 times. During this process, the film layer is observed to first become transparent and then transform into a white solid. Subsequent burning of the film layer does not produce any further change, thus obtaining the blackbody cavity layer. The thickness of the film layer is 0.05 µm-2 µm. The following reaction occurs, resulting in a fiber optic blackbody probe: The preparation of the coating colloidal mixture specifically includes: When magnesium aluminum spinel powder is dissolved in boiling water until solid remains, forming a saturated solution, the following reaction occurs: wherein, represents a hydrocarbon; After the reaction is complete, the container used for the above reaction is placed in an ice-water bath to allow the reaction product to cool and separate into layers. The upper liquid layer is removed, and a partially gel-like material is formed in the lower layer, undergoing the following reaction to obtain the coating colloidal mixture: The step of embedding the probe end of the fiber optic blackbody probe into the turbine stator using 3D printing specifically includes: Design the reserved holes and build a three-dimensional model of the turbine stator based on the reserved holes; 3D printing is performed based on the aforementioned 3D model; After the pre-drilled hole is printed, press the probe end of the optical fiber into the bottom of the hole, and then spread the metal powder used for printing evenly to cover the probe end of the optical fiber and press it firmly into the pre-drilled hole.

2. The method of claim 1, wherein the fiber blackbody cavity temperature sensing system is configured to operate in a temperature range of 0°C to 1000°C. The reserved hole is an oblong hole with an arc diameter of 0.5 mm-1 mm and a length of 1.5 mm-2 mm.

3. The method of claim 1, wherein the fiber blackbody cavity temperature sensing system is configured to operate in a temperature range of 0°C to 1000°C. The 3D printing uses laser selective melting technology; the 3D printing is completed within 10 minutes.

4. The method of claim 1, wherein the fiber blackbody cavity temperature sensing system is configured to operate in a temperature range of 0°C to 1000°C. The integrated circuit for weak light signal processing, which is connected to the fiber optic end of the fiber optic blackbody probe, includes: The fiber optic end of the fiber optic blackbody probe is connected to the photoresistor in the photoelectric conversion circuit. The photoelectric conversion circuit is sequentially connected to a multi-stage amplifier circuit and a rectifier filter circuit to form an integrated circuit for weak light signal processing.

5. A fiber-optic blackbody cavity temperature sensing system produced by the method of any one of claims 1-4, wherein: The system includes a fiber optic blackbody probe, the probe end of which is embedded in a turbine stator. The fiber optic end of the blackbody probe is connected to a photoresistor in a weak optical signal processing integrated circuit. The weak optical signal processing integrated circuit includes a photoelectric conversion circuit, a multi-stage amplification circuit, and a rectifier and filter circuit connected in sequence. The weak optical signal processing integrated circuit converts the optical signal into an electrical signal, amplifies and filters it, and then transmits the electrical signal to a microcontroller. The microcontroller converts the electrical signal into a temperature value and inputs it into a digital tube to display the temperature value.

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