A self-grown fiber grating preparation method and a self-grown fiber grating sensor

Abstract

The application discloses a self-growth fiber grating preparation method and a self-growth fiber grating sensor, and relates to the technical field of optical fiber sensing, which comprises the following steps: applying ultraviolet glue at a preset distance of a first optical fiber and a second optical fiber, forming a suspension drop by using glue liquid tension, irradiating the ultraviolet light source connected by the first optical fiber for a preset time, and obtaining a refractive index self-growth structure; during the preparation process, the ultraviolet glue is alternately applied with two different refractive indexes, after the output end of the first optical fiber is updated to the refractive index self-growth structure, the steps of moving the second optical fiber, applying glue and irradiating are repeated until the total length of the self-growth structure reaches a preset grating length, and the self-growth fiber grating is obtained. The application realizes the periodic modulation of the refractive index of the fiber grating by alternately applying the ultraviolet glue with different refractive indexes and precisely controlling the irradiation, and the fiber grating sensor prepared by the application has the characteristics of controllable reflection or transmission characteristics, flexible preparation, low cost and excellent biocompatibility, and is suitable for large-scale commercial production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber sensing, in particular to a self-grown fiber grating preparation method and a self-grown fiber grating sensor. BACKGROUND

[0002] Optical fiber sensing technology is one of the key technologies in the field of sensing and detection today. Today's optical fiber detection technology is very mature and is widely used in the detection of various physical quantities or biochemical substances in various fields and industries, and plays a crucial role in various fields. For example, in the production field, the detection of physical quantities such as temperature, stress, and magnetic field; in the environmental protection field, the detection of gas, biochemical substances (heavy metal ions, etc.); in the biomedical field, the detection of biological tissue cells, viruses, and bacteria.

[0003] As an important branch of optical fiber sensing technology, optical fiber grating sensing technology has been widely used in the monitoring of temperature, strain and other physical quantities in complex environments due to its high sensitivity, fast response and anti-electromagnetic interference. However, the preparation of optical fiber gratings in related technologies has a relatively complex process and requires relatively harsh equipment, such as femtosecond lasers; ensuring the grating period also has a high requirement for grating writing equipment; micro optical fiber grating preparation is more difficult, and the requirement for grating writing equipment is higher, and the cost is also increased.

[0004] Today, with the rapid development of the Internet of Things, intelligent medical care and other fields, the demand for miniaturization, low cost and biocompatibility of optical fiber grating sensors is increasingly prominent, and it is urgent to develop an optical fiber grating preparation method with simplified process, low equipment dependence, controllable cost and excellent biocompatibility. SUMMARY

[0005] The purpose of the present application is to provide a self-grown fiber grating preparation method and a self-grown fiber grating sensor, which can reduce the dependence on equipment, simplify the preparation process, reduce the cost, and improve the biocompatibility, so as to realize the commercialization and wide application of micro optical fiber gratings.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] In a first aspect, the present application provides a self-grown fiber grating preparation method, comprising:

[0008] The first optical fiber and the second optical fiber are fixed horizontally, and the cores of the first optical fiber and the second optical fiber are located on the same horizontal plane;

[0009] The second optical fiber is moved horizontally, and the output end of the first optical fiber and the input end of the second optical fiber maintain a predetermined distance;

[0010] The UV glue is coated at a preset distance between the first fiber output end and the second fiber input end, the UV glue is suspended at the preset distance to form a droplet by using the glue liquid tension, and the UV glue is irradiated by the first fiber for a preset time by using a UV light source connected with the first fiber input end, so that a refractive index self-growth structure is obtained; the UV glue includes a first refractive index UV glue and a second refractive index UV glue; the second refractive index is greater than the first refractive index; the refractive index of the UV glue coated each time is different from that of the last time;

[0011] The first fiber output end is updated to the refractive index self-growth structure, and the step of horizontally moving the second fiber to keep the preset distance between the first fiber output end and the second fiber input end is returned until the total length of all the refractive index self-growth structures reaches a preset grating length, so that a self-growth fiber grating is obtained.

[0012] In a second aspect, the present application provides a self-growth fiber grating sensor, comprising:

[0013] The light source module, the transmission fiber, the fiber grating sensing module, the environment module containing the measured object, the optical circulator, the signal processing module and the host computer;

[0014] The light source module is used for providing an input light signal;

[0015] The transmission fiber is used for connecting the light source module, the optical circulator, the fiber grating sensing module and the signal processing module, and transmitting the input light signal;

[0016] The fiber grating sensing module is located in the environment module containing the measured object, and is used for reflecting the input light signal to generate a reflected light signal containing a characteristic reflection wavelength of the measured object;

[0017] The input end of the optical circulator is connected with the light source module through the transmission fiber; the bidirectional transmission interface is connected with the fiber grating sensing module through the transmission fiber, and is used for transmitting the light source signal and collecting the reflected light signal; and the output interface is connected with the signal processing module through the transmission fiber, and is used for transmitting the reflected light signal to the signal processing module;

[0018] The signal processing module is used for generating spectrum data according to the received reflected light signal; the spectrum data includes a reflection peak wavelength value;

[0019] The host computer is used for obtaining a detection result of the measured object based on the spectrum data and a calibration relationship between a reflection peak wavelength change amount and a measured quantity of the measured object; the measured quantity includes temperature and concentration.

[0020] According to the specific embodiments provided by the present application, the present application has the following technical effects:

[0021] The application provides a self-grown fiber grating preparation method and a self-grown fiber grating sensor, wherein the first fiber and the second fiber are horizontally fixed, and the fiber cores thereof are located on the same horizontal plane, so that the accurate alignment between the fibers is realized; the second fiber is horizontally moved, and the ultraviolet glue with different refractive indexes is coated, liquid drops are formed by using the glue liquid tension, and ultraviolet light is irradiated, so that the problems of high equipment dependence and complex production in the existing fiber grating preparation are solved, and the simple preparation of the micro fiber grating is realized; the ultraviolet glue with different refractive indexes is coated for multiple times, and the refractive index self-grown structure is gradually constructed, so that the problem that the grating structure is difficult to be accurately controlled in the traditional method is solved, and the accurate regulation and control of the grating length and structure are realized; and the fiber grating sensor prepared by the above method solves the problem of low biocompatibility of the existing sensor, and realizes the wide application of the sensor in the fields of biomedicine and the like. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0023] Figure 1 A flowchart of a self-grown fiber grating preparation method provided by an embodiment of the present application is shown in the figure.

[0024] Figure 2 A flowchart of a self-grown fiber grating preparation method provided by another embodiment of the present application is shown in the figure.

[0025] Figure 3 A structure diagram of a self-grown fiber grating sensor provided by an embodiment of the present application is shown in the figure. Figure 3 (a) is a structure diagram of a reflective self-grown fiber grating sensor; Figure 3 (b) is a structure diagram of a transmissive self-grown fiber grating sensor;

[0026] Figure 4 An optical transmission principle diagram of a self-grown fiber grating provided by an embodiment of the present application is shown in the figure. Figure 4 (a) is an optical transmission principle diagram of a fiber grating; Figure 4 (b) is a light source spectrum diagram; Figure 4 (c) is a reflected spectrum diagram of a self-grown fiber grating; Figure 4 (d) is a transmitted spectrum diagram of a self-grown fiber grating;

[0027] Figure 5 A biological sensing principle diagram of a self-grown fiber grating provided by an embodiment of the present application is shown in the figure. Figure 5(a) is a biosensor schematic diagram of self-grown fiber grating; Figure 5 (b) is a biosensor reflection spectrum diagram through self-grown fiber grating; Figure 5 (c) is a biosensor transmission spectrum diagram through self-grown fiber grating;

[0028] Figure 6 A structural schematic diagram of a computer device is provided for an embodiment of the present application.

[0029] Reference signs: 1-signal processing module; 2-light source module; 3-optical circulator; 4-transmission optical fiber; 5-fiber grating sensing module; 6-environmental module containing the measured object; 7-upper computer; 8-first refractive index ultraviolet glue; 9-optical fiber holder and base; 10-ultraviolet light source; 11-fiber core; 12-first refractive index self-grown microstructure; 13-second refractive index ultraviolet glue; 14-second refractive index self-grown microstructure; 15-reflected light; 16-reflection spectrum; 17-wideband optical signal; 18-transmitted light; 19-transmission spectrum; 20-measured object; 21-sensitivity of the measured object. DETAILED DESCRIPTION

[0030] First, the technical terms involved in the present application are introduced.

[0031] The core of fiber grating sensing technology is to use the characteristics of fiber Bragg grating (FBG) to realize accurate measurement of target parameters through the change of reflected wavelength. Fiber grating sensing technology has the advantages of compact structure, easy integration and multipoint multiplexing, and can meet the demand of multipoint and distributed monitoring in modern industry. At present, fiber grating sensing technology is mainly divided into sensing technology based on Bragg grating and sensing technology based on long period fiber grating (LPFG). The sensing technology based on grating mainly realizes the measurement of temperature, strain or magnetic field and other parameters by monitoring the shift of reflected wavelength / transmitted wavelength, has high sensitivity and good linear response characteristics, is suitable for high-precision monitoring scenes, and is widely used in physical quantity monitoring in various fields. In addition, fiber grating sensing technology is often used for biochemical sensing. Different sensitive substances are modified at the position of the grating, which can realize the detection of heavy metal ions, pollutants, and even the detection of biological secretions, viruses and bacteria in biology, and even the detection of human cell secretions in life science to monitor human health. Miniaturized fiber grating sensors perform particularly outstanding in these fields, so miniaturization has become one of the mainstream directions of fiber grating sensing development, which can make fiber grating sensing be applied to more fields and have more excellent performance.

[0032] However, the fiber grating preparation in the related art has a relatively complex process and a relatively harsh equipment requirement, for example, a femtosecond laser, and ensuring the grating period also has a very high requirement for the grating writing equipment, and the micro fiber grating preparation is more difficult, the requirement for the grating writing equipment is higher, and the cost is also increased, which hinders the commercialization and wide application of the microstructure fiber grating sensor. Only by solving the problems of high cost, high requirement for equipment and strong dependence, the micro fiber grating sensor is expected to realize more commercialized production and wide application in the future. Under the above background, the main focus is to continuously develop a fiber sensor with a simple process, a novel structure, a low cost and good performance.

[0033] The present application can grow a low refractive index photosensitive polymer microstructure on the end face of the optical fiber by ultraviolet curing, continue to grow a high refractive index photosensitive polymer microstructure on the basis of the grown polymer microstructure by the same method, repeatedly grow a plurality of photosensitive polymer microstructures with high and low refractive index alternately to form a periodic grating structure, and build a reflective fiber grating sensor through the reflection wavelength, or build a transmission fiber grating sensor by connecting a transmission optical fiber at the end of the photosensitive polymer grating periodic grating structure. The sensor can be used to measure various physical quantities, and modification of sensitive substances on the photosensitive polymer grating can also realize biochemical sensing.

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail in combination with the drawings and specific embodiments.

[0036] In an exemplary embodiment, as shown in Figure 1 A self-grown fiber grating preparation method is provided, including the following steps 101 to 104. Wherein:

[0037] Step 101, respectively fix the first optical fiber and the second optical fiber horizontally, and make the cores of the first optical fiber and the second optical fiber located at the same horizontal plane.

[0038] Step 102, horizontally move the second optical fiber, and make the output end of the first optical fiber and the input end of the second optical fiber keep a preset distance.

[0039] Step 103, coating the ultraviolet glue at the preset distance between the first optical fiber output end and the second optical fiber input end, using the glue liquid tension to make the ultraviolet glue suspended at the preset distance to form a droplet; and using an ultraviolet light source to irradiate the ultraviolet glue through the first optical fiber for a preset time to obtain a refractive index self-growth structure; the ultraviolet light source is connected with the first optical fiber input end; the ultraviolet glue includes a first refractive index ultraviolet glue and a second refractive index ultraviolet glue; the second refractive index is greater than the first refractive index; the refractive index of the ultraviolet glue coated each time is different from the last time.

[0040] Step 104, updating the first optical fiber output end to the refractive index self-growth structure, returning to step 102 until the total length of all the refractive index self-growth structures reaches the preset grating length to obtain a self-growth fiber grating.

[0041] By implementing the above steps 101 to 104, the present application can effectively reduce the dependence of the fiber grating preparation process on complex equipment, and through simple horizontal fixing and moving operations, in combination with the refractive index change of the ultraviolet glue and ultraviolet light irradiation, the self-growth preparation of the micro fiber grating is realized.

[0042] As an optional embodiment, by dropping and coating ultraviolet glue (polymer) on the end faces of two optical fibers, inputting ultraviolet light with a wavelength of 350-400 nm at one end, the ultraviolet light is emitted from the optical fiber core coated with ultraviolet glue and irradiates the ultraviolet glue to realize light curing and growth of the polymer microstructure, and repeated growth of the polymer microstructure with the same length and diameter of the high and low refractive index can form a periodic micro grating structure to constitute a self-growth micro fiber grating. The length of the microstructure growth can be regulated by adjusting the power of the ultraviolet light and the light irradiation time to constitute a self-growth micro grating with different periods. The shape of the generated structure can be changed by changing the properties of the incident light to realize a self-growth micro grating with different shapes and different sensitivities.

[0043] In another exemplary embodiment of the present application, the self-growth fiber grating preparation method further comprises:

[0044] The structure parameters of the self-growth fiber grating are adjusted by the following operations:

[0045] The longitudinal length of the self-growth fiber grating is adjusted by blocking the input end or the output end of the first optical fiber.

[0046] Or the longitudinal length or the period of the self-growth fiber grating is adjusted by placing a filter at the input end or the output end of the first optical fiber.

[0047] Or the shape, transverse size and number of the self-growth fiber grating are adjusted by setting a mask at the input end or the output end of the first optical fiber.

[0048] In another exemplary embodiment of the present application, the adjustment of the structure parameters of the self-growth fiber grating further comprises:

[0049] Adjusting the light power of the ultraviolet light source and the preset time of the ultraviolet light source irradiating the ultraviolet glue, and adjusting the longitudinal length of the self-grown fiber grating.

[0050] Or adjusting the refractive index of the ultraviolet glue, and adjusting the effective refractive index of the self-grown fiber grating.

[0051] As an optional implementation, the ultraviolet glue for photocuring can be divided into ultraviolet glue with high and low refractive indexes, and the effective refractive index of the self-grown micro grating periodic structure can be adjusted by adjusting the type or component of the ultraviolet glue according to the characteristic reflection wavelength, and the characteristic reflection wavelength can be adjusted. More types of periodic structure fiber gratings can also be prepared by using more kinds of ultraviolet glue with different refractive indexes or gradually changing refractive indexes.

[0052] In another exemplary embodiment of the present application, the ultraviolet glue further comprises ultraviolet glue doped with special functional substances, including magnetic substances, heavy metal ion sensitive substances or biological affinity substances. Not only can the self-grown fiber grating be endowed with sensitivity to magnetic field, heavy metal ions and other substances, and the sensitivity to physical quantities such as temperature and stress can be improved, but also the self-grown fiber grating can be endowed with good biological affinity, hydrophilicity and other additional characteristics, and more extensive applications can be realized.

[0053] In another exemplary embodiment of the present application, as Figure 2The preparation process of the self-grown fiber grating is shown in the figure. The self-grown fiber grating is prepared by the self-grown ultraviolet curing method. Two transmission optical fibers 4 (multimode optical fibers, the core 11 is 50 μm in diameter, and the cladding is 125 μm in diameter) are fixed on the optical fiber holder and the base 9, and the cores 11 of the two transmission optical fibers 4 are aligned on the same horizontal plane to facilitate the growth of the grating. The first refractive index ultraviolet glue (low refractive index ultraviolet glue) 8 is applied to the ends of the two transmission optical fibers, and the liquid drops are suspended between the two optical fibers by the tension of the ultraviolet glue itself. Then, the ultraviolet light source 10 is connected to the other end of the transmission optical fiber 4, and the ultraviolet light signal is propagated along the core 11 and output from the end of the optical fiber to irradiate the first refractive index ultraviolet glue (low refractive index ultraviolet glue) 8 for about 2-3 minutes to complete the ultraviolet curing, and the first refractive index self-grown microstructure 12 in the shape of the optical transmission track is formed. The shape of the first refractive index self-grown microstructure 12 changes according to the shape of the end face of the core 11. After the first first refractive index self-grown microstructure 12 is completed, the self-growth is continued on the basis, and the second refractive index ultraviolet glue 13 (higher than the first refractive index ultraviolet glue 8) is applied between the first refractive index self-grown microstructure 12 and the end face of the transmission optical fiber at the other end, and the second refractive index ultraviolet glue 13 is suspended between the first refractive index self-grown microstructure 12 and the end face of the optical fiber by the tension of the second refractive index ultraviolet glue 13. Then, the ultraviolet light source 10 is used to propagate the ultraviolet light signal along the core 11 and the first refractive index self-grown microstructure 12 and output to irradiate the second refractive index ultraviolet glue 13 for about 2-3 minutes to complete the ultraviolet curing, and the second refractive index self-grown microstructure 14 in the shape of the optical transmission track is formed.

[0054] The operation is repeated to form the self-grown microstructure with the first refractive index and the second refractive index, and the periodic grating structure can be formed to finally form the self-grown fiber grating. According to the characteristic reflection wavelength formula λ = 2n eff of the Bragg grating, it can be known that the characteristic reflection wavelength λ of the self-grown fiber grating is related to the effective refractive index n eff and the grating period Λ of the self-grown fiber grating. The length of the first refractive index self-grown microstructure 12 and the second refractive index self-grown microstructure 14 can be adjusted by adjusting the ultraviolet curing time and the light power of the ultraviolet light source 10, so as to control the grating period Λ of the self-grown fiber grating and further control the characteristic reflection wavelength λ of the self-grown fiber grating. The refractive index of the first refractive index ultraviolet glue 8 and the second refractive index ultraviolet glue 13 can also be adjusted to further control the effective refractive index n eff of the self-grown fiber grating and further control the characteristic reflection wavelength λ of the self-grown fiber grating. Compared with the traditional preparation of the fiber grating, the characteristic reflection wavelength λ of the self-grown fiber grating is more convenient to control, and the requirement for the equipment precision is also lower.

[0055] Based on the same inventive concept, the application further provides a self-grown fiber grating sensor for implementing the self-grown fiber grating preparation method described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more self-grown fiber grating sensor embodiments provided below can refer to the limitations of the self-grown fiber grating preparation method described above, which will not be repeated here.

[0056] In an exemplary embodiment, as shown in Fig. (a), a self-grown fiber grating sensor is provided, which includes a light source module 2, a transmission fiber 4, a fiber grating sensing module 5, an environment module 6 containing a to-be-measured object, an optical circulator 3, a signal processing module 1, and a host computer 7. Figure 3 (a) shows a self-grown fiber grating sensor, which includes a light source module 2, a transmission fiber 4, a fiber grating sensing module 5, an environment module 6 containing a to-be-measured object, an optical circulator 3, a signal processing module 1, and a host computer 7.

[0057] The light source module 2 is used to provide an input light signal.

[0058] The transmission fiber 4 is used to connect the light source module 2, the optical circulator 3, the fiber grating sensing module 5, and the signal processing module 1, and transmit the input light signal.

[0059] The fiber grating sensing module 5 is located in the environment module 6 containing the to-be-measured object, and is used to reflect the input light signal to generate a reflected light signal containing the characteristic reflection wavelength of the to-be-measured object.

[0060] The input end of the optical circulator 3 is connected with the light source module 2 through the transmission fiber 4; the bidirectional transmission interface is connected with the fiber grating sensing module 5 through the transmission fiber 4, and is used to transmit the light source signal and collect the reflected light signal; and the output interface is connected with the signal processing module 1 through the transmission fiber 4, and is used to transmit the reflected light signal to the signal processing module 1. Specifically, the optical circulator 3 is a required fiber device for the reflective fiber sensor, the input end is connected with the input light source of the light source module 2 through the transmission fiber 4, the bidirectional transmission interface is connected with the fiber grating sensing module 5 through the transmission fiber 4, the input light signal of the light source module 2 is input into the fiber grating sensing module 5, and the reflected light signal thereof is transmitted back to the optical circulator 3, the output interface is connected with the signal processing module 1 through the transmission fiber 4, and the reflected light signal is transmitted to the signal processing module 1 to process the reflected light signal; the signal processing module 1 contains a fiber spectrometer, which is mainly used to receive the reflected light signal (and realize demodulation processing to form a spectrum.

[0061] The signal processing module 1 is used to generate spectrum data according to the received reflected light signal; the spectrum data includes a reflection peak wavelength value.

[0062] The host computer 7 is used to obtain a detection result of the to-be-measured object based on the spectrum data, according to a calibration relationship between a reflection peak wavelength change amount and a to-be-measured quantity of the to-be-measured object; the to-be-measured quantity includes temperature, concentration, PH value, pressure, electric field intensity, or magnetic field intensity.

[0063] In this embodiment, the optical circulator 3 is mainly used for reflective fiber grating sensors. The light source module contains a broadband light source, which provides a broadband light signal 17 into the entire sensing system for the self-grown fiber grating in the fiber grating sensing module 5 to generate a reflected light signal. Thus, the wavelength coverage of the entire light source includes the characteristic reflection wavelength of the fiber grating sensing module 5. The transmission fiber 4 transmits the broadband light signal 17 of the light source module 2 to the fiber grating sensing module 5 and collects the grating reflected light signal in the fiber grating sensing module 5. The grating of the fiber grating sensing module 5 is a self-grown microstructure at the end of the optical fiber by ultraviolet curing. The microstructure with different refractive indexes is staggered to form a periodic structure with grating characteristics to constitute a self-grown fiber grating. The characteristic reflection wavelength is calculated according to the grating period and the effective refractive index of the grating. The grating period can be changed by adjusting the ultraviolet curing time and the ultraviolet light power. The effective refractive index of the grating can be adjusted by adjusting the refractive index of the ultraviolet glue. The self-grown micro grating with the characteristic reflection wavelength is prepared. The preparation process of the self-grown micro grating does not need laser inscription grating, and the preparation is fast, controllable and low in dependence on equipment, which greatly reduces the production cost. According to the characteristics of the periodic structure, the light with the characteristic reflection wavelength and the light near the characteristic reflection wavelength (very narrow) have very high reflectivity. The light with the non-characteristic reflection wavelength and the light near the non-characteristic reflection wavelength have very high transmissivity, so as to form sharp reflection peaks and transmission peaks. The external environment or sensitive substances change the characteristic reflection wavelength of the grating by changing the period length or the effective refractive index of the grating. The self-grown fiber grating sensor can detect whether the reflected wavelength of the fiber grating sensing module 5 changes and the change amount to realize qualitative and quantitative sensing of physical quantities or biochemical substances. The optical circulator 3 is mainly used for reflective fiber grating sensors, which can collect the reflected light signal reflected by the fiber grating sensing unit in one direction and transmit it to the signal processing module 1. The signal processing module 1 contains a fiber spectrometer, which collects and processes the reflected light 15 of the fiber grating sensing unit, transmits the processed spectrum to the upper computer 7, and presents the spectrum image processed by the fiber spectrometer in the signal processing module. The center wavelength drift of the reflection peak / transmission peak of the sensor can be calibrated according to the physical quantity or the amount of the biochemical substance to be measured, that is, the calibration equation is obtained by calculating the relationship between the reflection peak wavelength / transmission peak wavelength and the physical quantity or the biochemical substance. After detecting the reflection peak wavelength / transmission peak wavelength in the subsequent sensing detection, the qualitative and quantitative sensing detection of the physical quantity and the biochemical substance can be realized according to the calibrated relationship. The reflective self-grown fiber grating sensor can directly insert the fiber grating sensing module 5 into the environment to be detected for detection.

[0064] As an optional embodiment, as shown in FIG. 4, the fiber grating sensing module 5 is connected to the light source module 2 through the transmission fiber 4, and the reflected light signal of the fiber grating sensing module 5 is collected by the optical circulator 3 and transmitted to the signal processing module 1. The signal processing module 1 contains a fiber spectrometer, which collects and processes the reflected light 15 of the fiber grating sensing unit, transmits the processed spectrum to the upper computer 7, and presents the spectrum image processed by the fiber spectrometer in the signal processing module. The center wavelength drift of the reflection peak / transmission peak of the sensor can be calibrated according to the physical quantity or the amount of the biochemical substance to be measured, that is, the calibration equation is obtained by calculating the relationship between the reflection peak wavelength / transmission peak wavelength and the physical quantity or the biochemical substance. After detecting the reflection peak wavelength / transmission peak wavelength in the subsequent sensing detection, the qualitative and quantitative sensing detection of the physical quantity and the biochemical substance can be realized according to the calibrated relationship. The reflective self-grown fiber grating sensor can directly insert the fiber grating sensing module 5 into the environment to be detected for detection. Figure 3(b) as shown, the self-growing fiber grating sensor further comprises: a light source module 2, a transmission fiber 4, a fiber grating sensing module 5, an environment module 6 containing the measured object, a signal processing module 4 and a host computer 7.

[0065] The light source module 2 is connected with the fiber grating sensing module 5 through the transmission fiber 4, and is used to provide an input light signal.

[0066] The transmission fiber 4 is used to transmit the input light signal. The transmission fiber 4 connects the light source module 2, the fiber grating sensing module 5 and the fiber spectrometer to form a transmission light path, and is mainly used for collecting and transmitting the light signal of the light source module 2 and the transmission light of the self-growing fiber grating.

[0067] The fiber grating sensing module 5 is located in the environment module 6 containing the measured object, and is connected with the signal processing module 1 through the transmission fiber 4, and is used to transmit the input light signal to generate a transmission light signal containing the characteristic transmission wavelength of the measured object.

[0068] The signal processing module 1 is also connected with the host computer 7, and is used to generate spectrum data according to the received transmission light signal; the spectrum data includes a transmission peak wavelength value.

[0069] The host computer 7 is used to obtain a detection result of the measured object based on the spectrum data, according to a calibration relationship between a transmission peak wavelength change amount and a measured quantity of the measured object; the measured quantity includes temperature, concentration, PH value, pressure, electric field intensity or magnetic field intensity.

[0070] The transmission type self-growing fiber grating sensor can detect the environment by placing the fiber grating sensing module 5 in the environment to be detected.

[0071] As an optional implementation, the fiber grating sensing module 5 includes a self-growing fiber grating.

[0072] The self-growing fiber grating is inserted and fixed in the environment module containing the measured object by using a sealed or open packaging structure. The detection cavity is formed by packaging, and the sensitive substance is modified on the periodic structure of the self-growing micro grating, so that the detection of biochemical substances can be realized.

[0073] Specifically, the self-growing fiber grating can be inserted into the open cavity structure such as a capillary tube by packaging to reduce the interference and noise generated by the external environment, and to improve the signal-to-noise ratio and sensing accuracy of the reflection spectrum and transmission spectrum.

[0074] In the implementation, the fiber grating sensing module 5 can be used to simultaneously grow multiple self-grown fiber gratings with different shapes, sizes, and lengths by using a multi-core optical fiber and a micro mask, and can also grow multiple self-grown fiber gratings with different shapes, lengths, and even effective refractive indexes. The reflection signals / transmission signals of the multiple self-grown fiber gratings can be jointly interfered to improve the performance of the fiber grating sensing module 5.

[0075] As an optional implementation, the self-grown fiber grating includes a sensitive substance to be measured, which is modified on the self-grown fiber grating by a silanization method or an electrostatic adsorption method. The sensitive substance includes an antibody, a bacteriophage, or an enzyme. The self-grown fiber grating sensor can be used to detect biological molecules, viruses, bacteria, and microorganisms, and can expand the application field of the self-grown fiber grating sensor.

[0076] As an optional implementation, the self-grown fiber grating sensing module further includes a cascaded self-grown fiber grating. The cascaded self-grown fiber grating is a self-grown fiber grating with different characteristic reflection wavelengths. By cascading multiple self-grown fiber gratings with different periods, parameter (temperature or magnetic field) compensation and multi-parameter sensing detection can be achieved. That is, multi-parameter sensing detection can be achieved by the drift of different reflection peak wavelengths / transmission peak wavelengths in the spectrum.

[0077] As an optional implementation, the signal processing module includes a fiber spectrometer.

[0078] The fiber spectrometer is used to collect spectral data of the to-be-measured substance in real time and output a reflection peak wavelength value of the to-be-measured substance.

[0079] As an optional implementation, the transmission optical fiber connection can be coated with a corresponding noise absorption material to reduce errors caused by the environment to the sensor during sensing detection, and to improve the signal-to-noise ratio and detection accuracy of the sensor.

[0080] In summary, as Figure 3 (a) and Figure 3(b) as shown, the self-grown fiber grating sensor based on self-grown fiber grating includes light source module 2, transmission fiber 4, fiber grating sensing module 5, optical circulator 3, signal processing module 1 and host computer 7. Light source module 2 inputs broadband light signal 17 (650nm-1700nm) into the entire self-grown fiber grating sensor through transmission fiber 4. Transmission fiber 4 connects light source module 2, fiber grating sensing module 5, optical circulator 3 (for reflective self-grown fiber grating sensor), signal processing module 1 to realize the optical path of the entire sensor, and transmits broadband light signal 17 to fiber grating sensing module 5, collects reflected / transmitted light signal and transmits it to information processing module 1 for processing. Fiber grating sensing unit 5 is composed of self-grown fiber gratings formed by sequentially self-growing multiple microstructures on the end face of the optical fiber by ultraviolet curing. When broadband light signal 17 is input into the self-grown fiber grating in fiber grating sensing module 5, narrow-band light signal near the characteristic reflection wavelength of the self-grown micrograting will be reflected back, and light with non-characteristic reflection wavelength will be transmitted to the next period structure, and the reflection and transmission of light will be repeated to form a superposition of reflected and transmitted light. The entire fiber grating sensing module 5 is placed in an environment module 6 containing the measured substance for detection. The environment can be a physical quantity detection environment (such as electromagnetic field, oven, etc.) or a biochemical environment (such as heavy metal ion solution, microbial culture solution, etc.).

[0081] Optical circulator 3 is a one-way transmission fiber element for reflected light signal in reflective self-grown fiber grating sensor. The input end (only input light, cannot output light) connects light source module 2 through transmission fiber 4 to receive broadband light signal 17, the bidirectional end (can output light and receive light) connects fiber grating sensing module 5 through transmission fiber 4 to transmit broadband light signal 17 from light source module 2 to fiber grating sensing module 5 and receive the reflected light signal generated thereby, and the output end (only output light, cannot input light) connects signal processing module 1 through transmission fiber 4 and transmits reflected light 15 signal to it for collection and processing. Signal processing module 1 includes a fiber spectrometer. Reflected light 15 signal / transmitted light 18 signal is transmitted to it through transmission fiber 4 for collection and processing to form a spectrum, and the spectrum information is displayed on the display through host computer 7. The relationship between the reflected / transmitted peak wavelength and the measured physical quantity / biological substance can be calculated and calibrated. Subsequently, the measured physical quantity / biological substance can be qualitatively and quantitatively detected according to the calibration relationship. The fiber grating sensor based on self-grown micrograting can build a transmission type sensing system or a reflection type sensing system, which has good flexibility.

[0082] In another exemplary embodiment of the present application, as shown in Figure 4 (a) and Figure 4(b) shows the light transmission principle diagram of the self-grown micro grating and the light source spectrum of the broadband light signal 17 of the light source module respectively. The two sides of the self-grown micro grating are connected with the end face of the transmission fiber through ultraviolet glue light curing, the cores 11 of the two sides of the transmission fiber are horizontally aligned with the self-grown fiber grating, and the broadband light signal 17 is input from the light source module 2 into the fiber grating sensing module 5, then the narrowband light near the characteristic reflection wavelength of each period of the self-grown fiber grating is reflected back to the direction of the broadband light signal 17 to form reflected light 15, and the reflected light 15 after passing through all the periods is superimposed to form a reflected spectrum 16, as shown in Figure 4 (c) shows that the specific reflected spectrum image will appear a sharp reflection peak near the characteristic reflection wavelength; the light at the non-characteristic reflection wavelength will be transmitted through each period of the self-grown micro grating to form transmitted light 18, and the transmitted light 18 after passing through all the periods is superimposed to form a transmitted spectrum 19, as shown in Figure 4 (d) shows that the specific transmitted spectrum image will appear a sharp loss peak near the characteristic reflection wavelength. During the sensing process, the sensing can be realized according to the changes of the characteristic reflection wavelength and the non-characteristic reflection wavelength.

[0083] In another exemplary embodiment of the present application, as shown in Figure 5 (a) is a biological sensing principle diagram of the self-grown fiber grating. The self-grown fiber grating is used for biological sensing, the sensitive substance 21 (antibody, bacteriophage, enzyme, etc.) of the measured substance is modified on the self-grown fiber grating by silanization, electrostatic adsorption or the like to constitute a self-grown fiber grating biosensor based on the self-grown fiber grating. The sensing part of the self-grown fiber grating biosensor, i.e. the fiber grating sensing module 5, is placed in a liquid environment or a gas environment containing the measured substance 20 (bacteria, virus, biological molecule, etc.), and the measured substance 20 meets the sensitive substance 21 of the measured substance to form a combination body by specific binding.

[0084] Therefore, when the broadband light signal 17 is input from the core 11 into the self-grown fiber grating of the fiber grating sensing module 5, according to the characteristic reflection wavelength formula of the Bragg grating λ = 2n eff Λ, the characteristic reflection wavelength λ will change according to the changes of the effective refractive index n eff and the grating period Λ, when the sensitive substance 21 of the measured substance on the self-grown fiber grating combines with the measured substance 20 to form a combination body, the effective refractive index of the self-grown microstructure at the corresponding position will change, thereby affecting the effective refractive index n eff of the self-grown fiber grating, according to the change of the effective refractive index, the characteristic reflection wavelength λ of the self-grown fiber grating will drift. As shown in Figure 5 (b) and Figure 5(c) as shown, the reflection peak wavelength and the loss peak wavelength on the reflection spectrum 16 and the transmission spectrum 19 will change, and the peak position will also drift, and the drift direction and the wavelength change direction are related to the effective refractive index n of the self-grown fiber grating after the sensitive substance 21 of the measured substance 20 is combined with the measured substance 20 eff The change amount of the characteristic reflection wavelength λ can be calculated and calibrated with the known concentration of the measured substance 20, and the calibrated relationship can be used to directly calculate the change amount of the characteristic reflection wavelength λ to realize the qualitative and quantitative sensing detection of the biochemical / biological.

[0085] The present application has the following advantages:

[0086] 1. The present application adopts a method of self-growing micrograting on the end face of the optical fiber by ultraviolet curing to build an optical fiber grating sensor. The characteristics of optical fiber core waveguide transmission are used to coat ultraviolet glue on the end of the two core aligned optical fibers. Ultraviolet light is transmitted through one of the optical fibers and output from the end of the optical fiber coated with ultraviolet glue to irradiate the ultraviolet glue for photocuring. According to the transmission direction of the optical waveguide, the cured ultraviolet glue forms a micro polymer structure. Then, different refractive index ultraviolet glue is replaced to continue growing micro polymer structures with different refractive indexes on the basis of the original micro polymer structure. The periodic structure is formed by repeatedly growing multiple times to form a self-growing micrograting. The optical fiber grating sensor prepared by this method does not need a laser to write a grating. Compared with the preparation of traditional optical fiber grating sensors, the preparation is faster, and the cost and dependence on equipment are greatly reduced.

[0087] 2. The present application adopts a method of self-growing micrograting on the end face of the optical fiber by ultraviolet curing. The self-growing micrograting with corresponding shape, size and number can be self-grown according to the shape, size and number of the optical fiber core. The input end or the input end of the optical fiber can be temporarily blocked, placed with a filter and a mask, etc. to realize the self-growing of self-growing microgratings with different shapes, different sizes, even different numbers and different lengths at the same time. Compared with the preparation of traditional special optical fiber gratings, this method for preparing microgratings has the advantages of simplicity, flexibility, efficiency and lower cost.

[0088] 3. This community utilizes self-grown microgratings as the sensing unit of self-grown fiber grating sensors. During fabrication, the grating period can be controlled by adjusting the power of the ultraviolet light and the curing time to create self-grown microgratings with different periods. Different refractive indices of ultraviolet adhesives can be used to fabricate self-grown microgratings, thereby controlling the effective refractive index and modulating the characteristic reflection wavelength to regulate the optical signal. Compared to traditional fiber grating fabrication, this method offers greater flexibility and controllability, and is simpler to operate. Furthermore, by changing different types of ultraviolet adhesives (doped with different substances, such as Fe3O4, or ultraviolet-cured hydrogels), different properties can be achieved to detect different physical quantities and biochemical substances. Additionally, the self-grown microgratings can be endowed with special functionalities, such as biocompatibility and hydrophilicity. A reflective self-grown fiber grating sensor can be constructed using its reflected wavelength; or a transmissive self-grown fiber grating sensor can be constructed by connecting a transmission fiber to the end of a periodic grating structure of a photosensitive polymer grating. The fiber grating sensor prepared by this method does not require writing gratings on the fiber core, is prepared quickly, reduces the cost of traditional fiber grating sensor preparation, and has lower equipment requirements. The prepared sensor can be used to measure various physical quantities, and biochemical sensing can also be achieved by modifying the photosensitive polymer grating with sensitive substances, enabling the sensor to achieve a wider range of sensing and detection applications.

[0089] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 6 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores the spectral data of the analyte. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection.

[0090] Those skilled in the art will understand that Figure 6The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps in the above method embodiments.

[0091] In an exemplary embodiment, a computer readable storage medium is provided, storing a computer program, which is executed by a processor to implement the steps in the above method embodiments.

[0092] In an exemplary embodiment, a computer program product is provided, including a computer program, which is executed by a processor to implement the steps in the above method embodiments.

[0093] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0094] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ReadOnly Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (Resistive Random Access Memory, ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc.

[0095] The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0096] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0097] The principles and implementation manners of the present application are described herein by using specific examples, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will have changes. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for fabricating a self-grown fiber grating, characterized in that, The method for fabricating the self-grown fiber grating includes: The first optical fiber and the second optical fiber are fixed horizontally respectively, and the cores of the first optical fiber and the second optical fiber are located on the same horizontal plane. Move the second optical fiber horizontally so that the output end of the first optical fiber and the input end of the second optical fiber maintain a preset distance; A UV adhesive is applied at a predetermined distance between the output end of the first optical fiber and the input end of the second optical fiber. The adhesive's surface tension causes it to suspend at this distance, forming droplets. A UV light source is then used to irradiate the adhesive through the first optical fiber for a predetermined time, resulting in a refractive index self-growing structure. The UV light source is connected to the input end of the first optical fiber. The UV adhesive includes a first refractive index UV adhesive and a second refractive index UV adhesive; the second refractive index is greater than the first refractive index. The refractive index of the UV adhesive applied each time is different from the previous application. Update the output end of the first fiber to a self-grown refractive index structure, return to the step "move the second fiber horizontally to keep the output end of the first fiber and the input end of the second fiber at a preset distance", until the total length of all self-grown refractive index structures reaches the preset grating length, and obtain a self-grown fiber grating. Specifically, the first and second optical fibers are horizontally placed and fixed on the fiber optic holder and base. A first refractive index UV adhesive is applied to the ends of both optical fibers, suspending them between the fibers using its own tension to form droplets. A UV light source is connected to the other end of the transmission fiber, transmitting UV light signals along the fiber core and outputting from the fiber end to irradiate the first refractive index UV adhesive, completing photocuring and forming a first refractive index self-grown microstructure along the light transmission trajectory. The shape of this microstructure changes according to the end face shape of the fiber core. After completing the first refractive index self-grown microstructure, further... Continuing with self-growth, a second refractive index UV adhesive is applied between the first refractive index self-grown microstructure and the end face of the transmission fiber. Utilizing its tension, it is suspended between the first refractive index self-grown microstructure and the fiber end face. A UV light source propagates the UV signal along the fiber core and the first refractive index self-grown microstructure, then emits it to irradiate the second refractive index UV adhesive, completing photocuring and forming a second refractive index self-grown microstructure along the light transmission trajectory. Repeating the above operations creates a self-grown microstructure with alternating first and second refractive indices, forming a periodic grating structure that ultimately constitutes a self-grown fiber grating.

2. The method for fabricating a self-grown fiber grating according to claim 1, characterized in that, The method for fabricating a self-grown fiber grating further includes: Adjust the structural parameters of the self-grown fiber Bragg grating using the following steps: The longitudinal length of the self-grown fiber grating can be adjusted by blocking the input or output end of the first fiber. Alternatively, the longitudinal length or period of the self-grown fiber grating can be adjusted by placing a filter at the input or output end of the first fiber. Alternatively, the shape, lateral dimensions, and number of self-grown fiber gratings can be adjusted by setting a mask at the input or output end of the first fiber.

3. The method for fabricating a self-grown fiber grating according to claim 2, characterized in that, The adjustment of the structural parameters of the self-grown fiber grating also includes: Adjust the optical power of the ultraviolet light source and the preset time for the ultraviolet light source to irradiate the ultraviolet adhesive, and adjust the longitudinal length of the self-grown fiber grating; Alternatively, the refractive index of the UV colloid can be adjusted to modify the effective refractive index of the self-grown fiber grating.

4. The method for fabricating a self-grown fiber grating according to claim 1, characterized in that, The UV adhesive also includes: UV adhesive or UV-curable hydrogel doped with special functional substances, wherein the special functional substances include magnetic substances, heavy metal ion sensitive substances or biocompatible substances.

5. A self-grown fiber Bragg grating sensor, characterized in that, The self-grown fiber Bragg grating sensor includes: a light source module, a transmission fiber, a fiber Bragg grating sensing module, an environmental module containing the object to be measured, an optical circulator, a signal processing module, and a host computer; The light source module is used to provide the input light signal; The transmission optical fiber is used to connect the light source module, optical circulator, fiber optic grating sensing module and signal processing module to transmit the input optical signal. The fiber optic grating sensing module, located within the environmental module containing the analyte, reflects the input light signal to generate a reflected light signal containing the characteristic reflection wavelength of the analyte. The fiber optic grating sensing module includes a self-grown fiber optic grating. Specifically, a first and second optical fiber are horizontally placed and fixed on a fiber optic holder and base. A first refractive index UV adhesive is applied to the ends of both optical fibers, suspending them between the two fibers using its own tension to form droplets. A UV light source is connected from the other end of the transmission fiber, transmitting the UV light signal along the fiber core and outputting it from the fiber end to irradiate the first refractive index UV adhesive, completing photocuring and forming a self-grown microstructure of the first refractive index along the light transmission trajectory. Its shape varies according to the end face shape of the fiber core. Changes occur; after completing the self-grown microstructure of the first refractive index, self-growth continues on the basis of the self-grown microstructure of the first refractive index. The second refractive index UV adhesive is applied between the self-grown microstructure of the first refractive index and the end face of the transmission optical fiber at the other end. It is suspended between the self-grown microstructure of the first refractive index and the end face of the optical fiber by utilizing its tension. The UV light signal is propagated along the fiber core and the self-grown microstructure of the first refractive index by a UV light source and emitted to irradiate the second refractive index UV adhesive to complete photocuring, forming the second refractive index self-grown microstructure along the shape of the light transmission trajectory. Repeating the above operation forms a self-grown microstructure with alternating first and second refractive indices, which can form a periodic grating structure and finally form a self-grown fiber grating. The input end of the optical circulator is connected to the light source module via a transmission optical fiber; the bidirectional transmission interface is connected to the fiber optic grating sensing module via a transmission optical fiber, used to transmit light source signals and collect reflected light signals; the output interface is connected to the signal processing module via a transmission optical fiber, used to transmit reflected light signals to the signal processing module. The signal processing module is used to generate spectral data based on the received reflected light signal; the spectral data includes the wavelength values ​​of the reflection peaks. The host computer is used to obtain the detection results of the analyte based on spectral data and the calibration relationship between the change in wavelength of the reflection peak and the analyte to be measured; the analyte to be measured includes temperature, concentration, pH value, pressure, electric field strength or magnetic field strength.

6. The self-grown fiber Bragg grating sensor according to claim 5, characterized in that, The self-grown fiber Bragg grating sensor also includes: a light source module, a transmission fiber, a fiber Bragg grating sensing module, an environmental module containing the object to be measured, a signal processing module, and a host computer. The light source module is connected to the fiber optic grating sensing module via a transmission optical fiber and is used to provide the input optical signal; Optical fiber is used to transmit input optical signals; The fiber optic grating sensing module is located within the environmental module containing the object to be measured. It is connected to the signal processing module via a transmission optical fiber and is used to transmit the input optical signal to generate a transmitted optical signal containing the characteristic transmission wavelength of the object to be measured. The signal processing module is also connected to a host computer and is used to generate spectral data based on the received transmitted light signal; the spectral data includes the transmission peak wavelength value. The host computer is used to obtain the detection results of the analyte based on spectral data and the calibration relationship between the change in transmission peak wavelength and the analyte to be measured; the analyte to be measured includes temperature, concentration, pH value, pressure, electric field strength or magnetic field strength.

7. The self-grown fiber Bragg grating sensor according to claim 5, characterized in that, Using a sealed or open encapsulation structure, the self-grown fiber Bragg grating is inserted and fixed into the environmental module containing the test object.

8. The self-grown fiber Bragg grating sensor according to claim 7, characterized in that, The self-grown fiber grating includes a analyte that has been modified onto the analyte by silanization or electrostatic adsorption; the analyte includes antibodies, bacteriophages, or enzymes.

9. The self-grown fiber Bragg grating sensor according to claim 7, characterized in that, The fiber grating sensing module further includes: cascaded self-grown fiber gratings; the cascaded self-grown fiber gratings are formed by cascading multiple self-grown fiber gratings with different characteristic reflection wavelengths on the same optical fiber.

10. The self-grown fiber Bragg grating sensor according to claim 5, characterized in that, The signal processing module includes a fiber optic spectrometer; The fiber optic spectrometer is used to acquire the spectral data of the analyte in real time and output the wavelength value of the reflection peak of the analyte.

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