Fiber-optic OCT probe with integrated distributed temperature sensing

Abstract

The present invention discloses an optical fiber OCT probe with integrated distributed temperature sensing function. The dual-mode detection probe includes a transparent catheter, an optical fiber endoscopic OCT probe arranged in the transparent catheter, and a sensing optical fiber embedded in the wall of the transparent catheter for distributed temperature sensing; the sensing optical fiber is a thin-diameter single-mode optical fiber arranged in the transparent catheter; the optical fiber endoscopic OCT probe includes a torque coil tube, an optical fiber probe body arranged in the torque coil tube, and a protective head sleeved on the end of the torque coil tube; the optical fiber probe body includes an endoscopic single-mode optical fiber, a first coreless optical fiber, a gradient refractive index optical fiber, and a second coreless optical fiber that are fused in sequence. The dual-mode detection probe performs radial rotation scanning in tissues and organs through the optical fiber endoscopic OCT probe to obtain depth image information on the entire organ cross section, and the temperature information of each spatial position can be obtained through the demodulation of the sensing optical fiber signal to realize tissue imaging and distributed temperature sensing functions.

Description

Technical Field

[0001] The present invention relates to the technical field of detection probes, and in particular to an optical fiber OCT probe with integrated distributed temperature sensing function. Background Art

[0002] In medical preoperative and intraoperative testing, fiber optic endoscopes are very important clinical tools that can provide images of the interior of hollow organs to assist doctors in diagnosing patients. Optical coherence tomography (OCT) is a reflective medical imaging technology that uses the principle of low-coherence interference. It is based on a near-infrared broadband light source and reconstructs the microstructure of the sample by detecting the backscattered light of the sample to be tested. OCT has the ability to acquire non-destructive and high-resolution tomographic images, and can obtain the microstructural information of living tissues without invading the tissues, thereby realizing optical biopsy of human living tissues or organs, significantly reducing the pain of patients and improving the efficiency of disease detection and diagnosis.

[0003] Fiber-optic endoscopic OCT uses optical fibers to transmit signals, and fiber-optic probes can be used for endoscopic microscopic imaging. This technology not only has the advantages of general OCT imaging, but also has the characteristics of small size, light weight, corrosion resistance, electrical insulation, and resistance to electromagnetic interference. It is particularly suitable for imaging in narrow cavities that are difficult to reach with other imaging technologies, thereby performing high-resolution detection and early diagnosis of tissue lesions. The unique advantage of fiber-optic endoscopic probes is that they can accurately detect lesions in narrow organs in the human body, such as lipid deposits, plaques, and fibrous caps in blood vessels.

[0004] Abnormal pathological conditions such as inflammation, allergies, and organ failure can cause abnormal temperatures. Conventional medical infrared thermal imaging technology can only detect temperature distribution from the body surface. The obtained temperature position distribution is not accurate enough, and the temperature distribution of internal organ tissues can only be judged by the body surface temperature distribution.

[0005] Therefore, it can be seen that the fiber optic endoscope in the prior art method has the problem of being unable to deeply obtain the temperature distribution inside the organ tissue. Summary of the invention

[0006] The embodiment of the present invention provides a fiber optic OCT probe with integrated distributed temperature sensing function, aiming to solve the problem that the fiber optic endoscope in the prior art method cannot deeply obtain the temperature distribution inside the organ tissue.

[0007] The embodiment of the present application provides an optical fiber OCT probe with integrated distributed temperature sensing function, wherein the detection probe comprises a transparent catheter, an optical fiber endoscopic OCT probe arranged in the transparent catheter, and a sensing optical fiber for distributed temperature sensing embedded in the wall of the transparent catheter;

[0008] The sensing optical fiber is a thin-diameter single-mode optical fiber arranged in the transparent catheter;

[0009] The optical fiber endoscopic OCT probe comprises a torque coil tube, an optical fiber probe body arranged in the torque coil tube, and a protective head sleeved on the end of the torque coil tube;

[0010] The optical fiber probe body includes an endoscopic single-mode optical fiber, a first coreless optical fiber, a gradient refractive index optical fiber and a second coreless optical fiber which are fused in sequence; a cylindrical cavity is provided in the protection head; the end of the second coreless optical fiber is inserted into the cavity of the protection head for arrangement;

[0011] One end of the torque coil tube close to the optical fiber probe body is fixedly connected to the protection head; one end of the torque coil tube away from the protection head is fixedly connected to the rotating shaft of the rotating motor.

[0012] The optical fiber OCT probe with integrated distributed temperature sensing function, wherein the protective head is a transparent protective head.

[0013] The optical fiber OCT probe with integrated distributed temperature sensing function, wherein the end of the second coreless optical fiber extending into the concave cavity is provided with an inclined reflection surface, and the angle between the inclined reflection surface and the axial direction of the second coreless optical fiber meets the total reflection condition of the signal light transmitted in the second coreless optical fiber.

[0014] In the optical fiber OCT probe with integrated distributed temperature sensing function, the angle between the inclined reflection surface at the end of the second coreless optical fiber and the axial direction of the second coreless optical fiber is 50°.

[0015] In the optical fiber OCT probe with integrated distributed temperature sensing function, the end of the protective head facing away from the concave cavity is configured to be arc-shaped.

[0016] The optical fiber OCT probe with integrated distributed temperature sensing function, wherein the torque coil tube comprises two spiral coil layers, each of which is an annular spiral coil formed by at least one spiral wire;

[0017] The two spiral coil layers are combined in an inner and outer layer arrangement to form the torque coil tube.

[0018] In the optical fiber OCT probe with integrated distributed temperature sensing function, the spiral directions of the spiral lines in the two spiral coil layers are opposite.

[0019] In the optical fiber OCT probe with integrated distributed temperature sensing function, the gap between the torque coil tube and the outer wall of the optical fiber probe body is filled with glue.

[0020] In the optical fiber OCT probe with integrated distributed temperature sensing function, the set length of the gradient refractive index optical fiber enables the signal light beam to be focused to the expected target surface and enables the light spot to have the minimum lateral resolution.

[0021] The embodiment of the present invention provides an optical fiber OCT probe with integrated distributed temperature sensing function, the dual-mode detection probe includes a transparent catheter, an optical fiber endoscopic OCT probe arranged in the transparent catheter, and a sensing optical fiber embedded in the wall of the transparent catheter for distributed temperature sensing; the sensing optical fiber is a thin-diameter single-mode optical fiber arranged in the transparent catheter; the optical fiber endoscopic OCT probe includes a torque coil tube, an optical fiber probe body arranged in the torque coil tube, and a protective head sleeved on the end of the torque coil tube; the tail end of the second coreless optical fiber is provided with an inclined reflection surface. The above-mentioned dual-mode detection probe can perform radial rotation scanning in tissues and organs through the optical fiber endoscopic OCT probe to obtain depth image information on the entire organ cross section, and the temperature information of each spatial position can be obtained through the demodulation of the sensing optical fiber signal, thereby realizing tissue imaging and distributed temperature sensing functions in the organ, which is conducive to accurate and efficient detection and diagnosis of biological tissues. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0023] Figure 1 The overall structure diagram of the optical fiber OCT probe with integrated distributed temperature sensing function provided by an embodiment of the present invention;

[0024] Figure 2 A cross-sectional structural diagram of an optical fiber OCT probe with integrated distributed temperature sensing function provided in an embodiment of the present invention;

[0025] Figure 3 An internal structural diagram of a fiber-optic OCT probe with integrated distributed temperature sensing function provided in an embodiment of the present invention;

[0026] Figure 4 A partial cross-sectional structural diagram of an optical fiber OCT probe with integrated distributed temperature sensing function provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of an application of an optical fiber OCT probe with integrated distributed temperature sensing function provided by an embodiment of the present invention;

[0028] Figure 6A schematic diagram of the optical path structure of a fiber-optic OCT probe with integrated distributed temperature sensing function provided in an embodiment of the present invention.

[0029] Figure numerals: 1. transparent catheter; 2. fiber-optic endoscopic OCT probe; 3. sensing optical fiber; 32. thin-diameter single-mode optical fiber; 21. torque coil tube; 22. optical fiber probe body; 23. protective head; 221. endoscopic single-mode optical fiber; 222. first coreless optical fiber; 223. gradient refractive index optical fiber; 224. second coreless optical fiber; 231. concave cavity; 24. glue. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0032] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0033] See also Figures 1 to 4As shown in the figure, an optical fiber OCT probe with integrated distributed temperature sensing function is disclosed in an embodiment of the present application, wherein the detection probe includes a transparent catheter 1, an optical fiber endoscopic OCT probe 2 arranged in the transparent catheter 1, and a distributed temperature sensing sensing optical fiber 3 embedded in the tube wall of the transparent catheter 1; the sensing optical fiber 3 is a thin-diameter single-mode optical fiber 32 arranged in the transparent catheter 1; the optical fiber endoscopic OCT probe 2 includes a torque coil tube 21, an optical fiber probe body 22 arranged in the torque coil tube 21, and a protective cap sleeved on the end of the torque coil tube 21. The protective head 23; the optical fiber probe body 22 includes an endoscopic single-mode optical fiber 221, a first coreless optical fiber 222, a gradient refractive index optical fiber 223 and a second coreless optical fiber 224 which are sequentially fused; a cylindrical concave cavity 231 is provided in the protective head 23; the end of the second coreless optical fiber 224 is inserted into the concave cavity 231 of the protective head 23 for arrangement; the end of the torque coil tube 21 close to the optical fiber probe body 22 is fixedly connected to the protective head 23; the end of the torque coil tube 21 away from the protective head 23 is fixedly connected to the rotating shaft of a rotating motor (not shown in the figure). The above dual-mode detection probe can be used for medical detection.

[0034] The above-mentioned dual-modal detection probe combines the fiber-optic endoscopic OCT probe 2 (OCT probe) with the sensing fiber 3 (OFDR (Optical Frequency Domain Reflectometry) sensing fiber). The fiber-optic endoscopic OCT probe 2 can be used to perform radial rotation scanning in tissues and organs to obtain depth image information on the entire organ cross-section. Signal demodulation by the sensing fiber 3 can be used to obtain temperature information at each spatial position. A dual-modal detection probe can be used to achieve tissue imaging and distributed temperature sensing functions in the organ, which is conducive to accurate and efficient detection and diagnosis of biological tissues.

[0035] The rotating motor in the fiber-optic endoscope OCT probe 2 can drive the fiber-optic endoscope OCT probe 2 to rotate, and the fiber-optic endoscope OCT probe 2 can image the external biological tissue along the radial direction of the fiber-optic endoscope OCT probe 2 during the rotation process. At the same time, the sensing optical fiber 3 also performs temperature detection, thereby adjusting and obtaining the temperature signal in the biological body. Specifically, Figure 5As shown, in order to obtain an imaging image, the optical fiber probe body 22 in the optical fiber endoscope OCT probe 2 is electrically connected to the OCT mediation system, and the detection signal obtained by the optical fiber endoscope OCT probe 2 can be input into the OCT mediation system for mediation, thereby obtaining the corresponding imaging image. Similarly, in order to obtain the temperature signal in the body, the thin-diameter single-mode optical fiber 32 is electrically connected to the OFDR mediation system, and the detection signal obtained by the thin-diameter single-mode optical fiber 32 can be input into the OFDR mediation system for mediation, thereby obtaining the corresponding temperature signal. The sensing optical fiber 3 is encapsulated in the wall of the transparent catheter 1, and the optical fiber endoscope OCT probe 2 is set in the cavity in the transparent catheter 1, thereby preparing a dual-modal detection probe.

[0036] The optical fiber type endoscopic OCT probe 2 can realize the OCT imaging function, wherein the endoscopic single-mode optical fiber 221 is first fused with a first coreless optical fiber 222, and then a gradient refractive index optical fiber 223 is fused after the first coreless optical fiber 222. The specific optical path structure is as follows: Figure 6As shown. Among them, the endoscopic single-mode optical fiber 221 is used to transmit low-coherence signal light, and its main function is only transmission. The light from the light source is transmitted to the end, and the collected optical signal containing biological tissue information is also transmitted to the signal demodulation module of the OCT system. The main function of the first coreless optical fiber 222 is to expand the light. In this optical system, the first coreless optical fiber 222 has the greatest influence on the size of the light spot at the convergence point, which is actually the diffraction effect caused by the aperture. In order to make the light spot smaller, that is, the lateral resolution of OCT is higher, it is necessary to increase the effective light passing area, so a section of the first coreless optical fiber is introduced for beam expansion. After the first coreless optical fiber 222, a section of gradient refractive index optical fiber (GRINS) 223 is fused. The main function of the gradient refractive index optical fiber 223 is to focus the light. GRINS has self-focusing properties, and the light beam propagating in it will focus periodically; therefore, according to the material parameters of the GRINS itself used, and the actual focusing distance required, the appropriate length of GRINS optical fiber can be calculated, and then fused to the back of the first coreless optical fiber to achieve the expected focusing effect. Afterwards, a section of the first coreless optical fiber after polishing is fused to the other end of the gradient refractive index optical fiber 223, and the first coreless optical fiber after polishing is formed into the second coreless optical fiber 224, and the end of the second coreless optical fiber 224 is ground into an inclined reflection surface with a certain tilt angle, so that the light beam is emitted laterally by utilizing the total reflection effect of the inclined reflection surface. Afterwards, the combined optical fiber probe body 22 is inserted into a torque coil tube 21, and one end of the second coreless optical fiber 224 with the inclined reflection surface is arranged to extend from the end of the torque coil tube 21, and a protective head 23 is bonded to the end of the second coreless optical fiber 224 to protect the exposed inclined reflection surface of the second coreless optical fiber 224, and the protective head 23 can be set as a plastic protective head 23. A concave cavity 231 is arranged in the protective head 23, and the end of the second coreless optical fiber 224 can be plugged into the concave cavity 231, and the bottom end of the concave cavity 231 is air or inert gas, or the bottom end of the concave cavity 231 is evacuated. After the second coreless optical fiber 224 reflects the light beam, the light beam passes through the protective head 23 and the transparent catheter 1 arranged on the outside and is injected into the biological tissue. According to the reversible principle of the optical path, the back-Rayleigh scattering and the reflected part of the light injected into the biological tissue at different depths will return to the original path, be received by the second coreless optical fiber 224 and coupled back to the core of the endoscopic single-mode optical fiber 221, and the reflected light beam is transmitted to the OCT signal demodulation system at the rear end. The OCT signal demodulation system interferes with the reflected light beam and the reference arm light beam in the system, and the OCT signal demodulation system demodulates the interference signal, thereby restoring the image at the depth of the biological tissue at this position. After that, the optical fiber-type endoscopic OCT probe 2 is driven to rotate by a rotating motor to achieve radial scanning, thereby obtaining depth image information on the entire cross section.

[0037] The endoscopic single-mode optical fiber 221 is used to transmit low-coherence signal light, and its main function is only to transmit the light from the light source to the end, and also to transmit the collected optical signal containing biological tissue information to the signal demodulation module of the OCT system.

[0038] The main function of the single-mode fiber after fusion splicing is to expand the light beam. In this optical system, the diffraction effect caused by the aperture actually has the greatest impact on the size of the light spot at the convergence point. In order to make the light spot smaller, that is, the lateral resolution of OCT higher, the effective light transmission area must be increased, so a section of the first coreless fiber is introduced for beam expansion.

[0039] A thin-diameter single-mode optical fiber 32 (also known as an OFDR sensing optical fiber) is selected as the sensing optical fiber 3 and is arranged in the transparent catheter 1. Compared with ordinary single-mode optical fibers, the thin-diameter single-mode optical fiber 32 has higher sensing sensitivity and smaller radial dimensions. The transparent catheter 1 can be used to isolate the internal high-speed rotating optical fiber-type endoscope OCT probe 2 and the biological tissue to be measured, thereby protecting the sensing optical fiber 3. The thin-diameter single-mode optical fiber 32 can be used to transmit OFDR sensing signals. Among them, the thin-diameter single-mode optical fiber 32 can be regarded as a long-distance fiber Bragg grating with a random period. Each point on the optical fiber path of the thin-diameter single-mode optical fiber 32 will generate a backscattering signal. When the temperature at a certain spatial position changes, the reflection spectrum of the thin-diameter single-mode optical fiber 32 at this position will drift. The OFDR demodulation system at the back end can restore the temperature change at this position by demodulating this drift, that is, demodulating the spectrum change caused by temperature. When the operator inserts the dual-mode detection probe into the body, the OFDR demodulation system performs spectral demodulation on each spatial position on the thin-diameter single-mode optical fiber 32, so that the temperature at each position in the entire optical fiber link, that is, the temperature at each position in the body, can be detected.

[0040] In a more specific embodiment, the protective head 23 is a transparent protective head 23. Specifically, in order to further improve the transmission efficiency of the light beam, the transparent conduit 1 can be set as a glass transparent conduit or a plastic transparent conduit; similarly, the protective head 23 can also be set as a transparent protective head 23, such as setting the protective head 23 to be a transparent glass protective head 23 or a transparent plastic protective head 23.

[0041] In a more specific embodiment, the end of the second coreless optical fiber 224 extending into the concave cavity 231 is provided with an inclined reflection surface, and the angle between the inclined reflection surface and the axial direction of the second coreless optical fiber 224 satisfies the total reflection condition of the signal light transmitted in the first coreless optical fiber. Preferably, the angle between the inclined reflection surface at the end of the second coreless optical fiber 224 and the axial direction of the second coreless optical fiber 224 is 50°. Specifically, the end of the protective head 23 that is away from the concave cavity 231 is set to be arc-shaped.

[0042] Furthermore, in order to improve the reflection effect of the inclined reflection surface, the angle between the inclined reflection surface at the end of the second coreless optical fiber 224 and the axial direction of the second coreless optical fiber 224 can be set to meet the total reflection condition of the signal light (such as setting the angle to be greater than 45°), and the angle corresponding to the inclined reflection surface is set to be within this range, so that the light beam can achieve total reflection. In a more preferred embodiment, the angle between the inclined reflection surface and the axial direction of the second coreless optical fiber 224 can be set to 50°. This angle setting can achieve the best use effect. Furthermore, in order to improve the balance of the light beam emission in various directions by the protection head 23, the end of the protection head 23 away from the concave cavity 231 can be set to be arc-shaped, so that the light beam can be evenly emitted in various directions when passing through the protection head 23. The specific structure is as follows: Figure 2 shown.

[0043] The main function of the second coreless optical fiber 224 is to turn the light. In endoscopic imaging, a side-view optical path needs to be designed, so a section of the first coreless optical fiber is fused and polished to form the second coreless optical fiber. A bevel is polished at the end and the light is reflected using the principle of total reflection. The angle of this bevel only needs to be greater than the total reflection angle (different material refractive indices will cause the total reflection angle to be different, which is about 43 degrees). In actual applications, it is generally polished to be greater than 45 degrees. (If it is an angle of 45 degrees, it will cause the light beam to be incident on the outer layer of the medical transparent catheter. A relatively strong back-reflected signal will be seen during the OCT demodulation process, and the detector may be overexposed due to the high intensity. Therefore, it is necessary to grind a bevel greater than 45 degrees so that the light beam is obliquely incident and passes through the wall of the transparent catheter).

[0044] There is no fixed value for the length of each fiber segment. Different values ​​will be calculated based on the brand and model of the fiber used and the expected focusing effect. However, the role of each segment is fixed, that is, the endoscope single-mode fiber 221 is used for transmission; the first coreless fiber 222 is used for beam expansion; the graded refractive index fiber (GRINS) is used for focusing; the second coreless fiber is used for turning the optical path. Its optical path structure is as follows: Figure 6 shown.

[0045] In a more specific embodiment, the torque coil tube 21 includes two spiral coil layers, each of which is a ring-shaped spiral coil surrounded by at least one spiral line; the two spiral coil layers are combined in an inner and outer two-layer arrangement to form the torque coil tube 21. Specifically, the spiral directions of the spiral lines in the two spiral coil layers are opposite. The gap between the torque coil tube 21 and the outer wall of the optical fiber probe body 22 is filled with glue 24.

[0046] Specifically, Figure 2 and Figure 3As shown, the torque coil tube 21 can be set to include two spiral coil layers, so as to ensure that after being combined with the internal optical fiber probe body 22, a rotating rigid body can be formed. When the rotating motor fixedly connected to the rear end of the torque coil tube 21 is working, the torque coil tube 21 can be driven to rotate and the optical fiber and the torque coil tube 21 can be driven to rotate coaxially.

[0047] In order to further improve the rigidity of the torque coil tube 21, the spiral directions of the spiral lines in the two spiral coil layers can be set to be opposite, so that no matter whether the torque coil tube 21 rotates forward or reverse, the torque coil tube 21 will not relax, thereby improving the overall rotational rigidity of the torque coil tube 21. Glue 24, such as AB glue, can be filled between the outer wall of the torque coil tube 21 and the optical fiber probe body 22, and the torque coil tube 21 and the optical fiber probe body 22 are firmly connected by the glue 24.

[0048] In a more specific embodiment, the set length of the graded refractive index fiber 223 enables the signal beam to be focused on the expected target surface and enables the light spot to have a minimum lateral resolution. The length of the graded refractive index fiber 223 can be obtained by numerical calculation or optimization by simulation software, and its specific length value should ensure that the signal beam is focused on the expected target surface and the light spot has a minimum lateral resolution at this time.

[0049] In the fiber-optic OCT probe with integrated distributed temperature sensing function provided in the embodiment of the present invention, the dual-mode detection probe includes a transparent catheter, a fiber-optic endoscopic OCT probe disposed in the transparent catheter, and a sensing optical fiber embedded in the wall of the transparent catheter for distributed temperature sensing; the sensing optical fiber is a thin-diameter single-mode optical fiber disposed in the transparent catheter; the fiber-optic endoscopic OCT probe includes a torque coil tube, a fiber-optic probe body disposed in the torque coil tube, and a protective head sleeved on the end of the torque coil tube; the tail end of the second coreless optical fiber is provided with an inclined reflecting surface. The above-mentioned dual-mode detection probe can perform radial rotation scanning in tissues and organs through the fiber-optic endoscopic OCT probe to obtain depth image information on the entire organ cross section, and the temperature information of each spatial position can be obtained through the demodulation of the sensing optical fiber signal, thereby realizing tissue imaging and distributed temperature sensing functions in the organ, which is conducive to accurate and efficient detection and diagnosis of biological tissues.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An optical fiber OCT probe with integrated distributed temperature sensing function, characterized in that: The detection probe comprises a transparent catheter, an optical fiber endoscopic OCT probe arranged in the transparent catheter, and a distributed temperature sensing optical fiber embedded in the wall of the transparent catheter; The sensing optical fiber is a thin-diameter single-mode optical fiber arranged in the transparent catheter; The optical fiber endoscopic OCT probe comprises a torque coil tube, an optical fiber probe body arranged in the torque coil tube, and a protective head sleeved on the end of the torque coil tube; The optical fiber probe body comprises an endoscopic single-mode optical fiber, a first coreless optical fiber, a graded refractive index optical fiber and a second coreless optical fiber which are fused in sequence; a cylindrical cavity is provided in the protection head; the end of the second coreless optical fiber is inserted into the cavity of the protection head for arrangement; an inclined reflection surface is provided at the end of the second coreless optical fiber extending into the cavity, and the angle between the inclined reflection surface and the axial direction of the second coreless optical fiber satisfies the total reflection condition of the signal light transmitted in the second coreless optical fiber; The graded refractive index optical fiber periodically focuses the light beam propagating therein; the bottom end of the cavity is filled with an inert gas or evacuated; One end of the torque coil tube close to the optical fiber probe body is fixedly connected to the protection head; one end of the torque coil tube away from the protection head is fixedly connected to the rotating shaft of the rotating motor.

2. The optical fiber OCT probe with integrated distributed temperature sensing function according to claim 1, characterized in that: The protective head is a transparent protective head.

3. The optical fiber OCT probe with integrated distributed temperature sensing function according to claim 2, characterized in that: The angle between the inclined reflection surface at the end of the second coreless optical fiber and the axial direction of the second coreless optical fiber is 50°.

4. The optical fiber OCT probe with integrated distributed temperature sensing function according to any one of claims 1 to 3, characterized in that: One end of the protection head facing away from the concave cavity is configured in an arc shape.

5. The optical fiber OCT probe with integrated distributed temperature sensing function according to claim 1, characterized in that: The torque coil tube comprises two spiral coil layers, each of which is an annular spiral coil formed by at least one spiral wire; The two spiral coil layers are combined in an inner and outer layer arrangement to form the torque coil tube.

6. The optical fiber OCT probe with integrated distributed temperature sensing function according to claim 5, characterized in that: The spiral directions of the spiral lines in the two spiral coil layers are opposite.

7. The optical fiber OCT probe with integrated distributed temperature sensing function according to claim 5 or 6, characterized in that: The gap between the torque coil tube and the outer wall of the optical fiber probe body is filled with glue.

8. The optical fiber OCT probe with integrated distributed temperature sensing function according to claim 4, characterized in that: The set length of the graded refractive index optical fiber enables the signal light beam to be focused onto a desired target surface and enables the light spot to have a minimum lateral resolution.

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