Monitoring system for strain / temperature of a divertor of a fusion device

Abstract

The application belongs to the technical field of nuclear fusion device application, and discloses a fusion device divertor strain / temperature monitoring system, wherein the optical fiber capillary encapsulating element is fixedly arranged on the divertor box body from the high-field side of the divertor box body along the contour of the divertor box body and is led out from the low-field side of the divertor box body and connected to a demodulator; the strain fiber grating sensor is distributed along the optical fiber capillary encapsulating element and is pre-tightly fixed at the strain monitoring point of the divertor box body; the temperature fiber grating sensor is distributed along the optical fiber capillary encapsulating element and is located at the temperature monitoring point of the divertor box body; and the optical fiber capillary encapsulating element arranged with the temperature fiber grating sensor is not arranged with the strain fiber grating sensor. The application is suitable for dense arrangement at multiple points on the divertor box body, can realize real-time and comprehensive monitoring of the strain / temperature of the divertor box body, and the monitoring data is reliable and effective.

Description

Technical Field

[0001] This invention relates to the field of nuclear fusion device application technology, and in particular to a strain / temperature monitoring system for a divertor in a fusion device. Background Technology

[0002] Fusion energy is the ultimate ideal energy source for human society in terms of both safety and cleanliness. Moreover, fusion fuel is abundant on Earth. Deuterium is very rich in seawater, and tritium can be produced from lithium on Earth, with sufficient reserves to meet the supply of deuterium-tritium fusion fuel.

[0003] The divertor is one of the core components of a tokamak fusion device. It consists of a plasma-facing component and a divertor housing for integrating the plasma-facing component. Located within a vacuum chamber, the divertor operates under high temperature, high radiation, and high dynamic load conditions. Structural strain and high temperatures can cause cracks to form, propagate, and eventually lead to fatigue fracture within the divertor housing. Therefore, it is essential to monitor the strain and temperature of the divertor housing in real time to detect potential hazards and take appropriate measures to prevent equipment damage. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, one objective of this invention is to provide a strain / temperature monitoring system for a divertor in a fusion device, suitable for dense multi-point arrangement on the divertor housing, capable of real-time and comprehensive monitoring of the strain / temperature of the divertor housing, with reliable and effective monitoring data.

[0005] A strain / temperature monitoring system for a divertor in a fusion device according to an embodiment of the present invention includes a strain / temperature monitoring assembly disposed on a selected divertor housing within a vacuum chamber, the strain / temperature monitoring assembly comprising:

[0006] An optical fiber capillary package is fixedly arranged on the divertor housing from the high field side along the outer shape of the divertor housing, and led out from the low field side of the divertor housing to be connected to the demodulator.

[0007] A strain fiber Bragg grating sensor is provided, wherein the strain fiber Bragg grating sensor is distributed along the fiber capillary package and pre-tightly fixed at the strain monitoring points of the divertor housing, and the strain monitoring points are in a straight shape.

[0008] A temperature fiber Bragg grating sensor is provided, wherein the temperature fiber Bragg grating sensor is distributed along the fiber capillary package and located at the temperature monitoring point of the divertor housing, and the temperature monitoring point is in a straight line; the strain fiber Bragg grating sensor is not arranged on the fiber capillary package where the temperature fiber Bragg grating sensor is arranged.

[0009] The working principle of the strain / temperature monitoring system for the divertor of the fusion device in this embodiment of the invention is as follows: The strain fiber Bragg grating sensor and the temperature fiber Bragg grating sensor are arranged correspondingly at the strain monitoring points and temperature monitoring points on the divertor housing. The strain fiber Bragg grating sensor and the temperature fiber Bragg grating sensor transmit their respective optical signals back to the demodulator through their respective corresponding fiber capillary packages. The demodulator performs calculations on the optical signals to obtain the strain and temperature data at the corresponding strain monitoring points and temperature monitoring points. This allows for a comprehensive assessment of the strain and temperature distribution on the surface of the divertor housing, and timely control and adjustment of the divertor's operating state to avoid structural damage.

[0010] The strain / temperature monitoring system for the divertor of the fusion device according to this invention has the following advantages: 1) The strain / temperature monitoring component includes the fiber capillary package, the strain fiber Bragg grating sensor, and the temperature fiber Bragg grating sensor, which has anti-electromagnetic interference capability and can monitor the strain / temperature of the divertor housing in real time under harsh environments such as high temperature, high electromagnetic radiation, and strong electromagnetic interference in a vacuum chamber. The monitoring data is reliable and effective, which is conducive to timely processing; 2) The strain fiber Bragg grating sensor and the temperature fiber Bragg grating sensor can be distributed at multiple points on their respective single fiber capillary packages, and due to their small size, they can be densely arranged on the surface of the divertor housing; 3) The strain / temperature monitoring component occupies little space and can be arranged in the narrow space or area of ​​the divertor housing to acquire relevant strain / temperature data.

[0011] In some embodiments, the fiber capillary package includes an optical fiber and a capillary tube encapsulating the optical fiber; the strain fiber grating sensor includes a strain grating etched section directly formed on the optical fiber; and the temperature fiber grating sensor includes a temperature grating etched section directly formed on the optical fiber.

[0012] In some embodiments, the strain fiber Bragg grating sensor further includes a strain gauge encapsulation structure; the strain grating etched section is encapsulated using the strain gauge encapsulation structure instead of the capillary encapsulation; the ends of the capillary adjacent to both ends of the strain grating etched section are fixed to the optical fiber; both ends of the strain gauge encapsulation structure are respectively fixed to the ends of the capillary adjacent to both ends of the strain grating etched section and apply prestress to the strain grating etched section.

[0013] In some embodiments, the strain gauge packaging structure is ring-shaped, including two strain gauges facing each other and two connecting portions respectively connected between the two ends of the two strain gauges, wherein one of the strain gauges is in contact with the surface of the divertor housing; the ends of the capillaries near the two ends of the strain grating etched section are respectively fixed to the two connecting portions.

[0014] In some embodiments, the temperature grating etched section is directly encapsulated in the capillary.

[0015] In some embodiments, the strain monitoring points include the bends of the divertor housing and the areas with relatively high stress determined by simulation of various operating conditions of the divertor housing; the temperature monitoring points include the area adjacent to the strain fiber Bragg grating sensor and the areas with relatively high temperature determined by simulation of various operating conditions of the divertor housing.

[0016] In some embodiments, the temperature monitoring points also include locations with relatively small strain determined by simulation of various operating conditions of the divertor housing, and locations with relatively small temperatures determined by simulation of various operating conditions of the divertor housing.

[0017] In some embodiments, the strain / temperature monitoring assembly further includes a fastener that secures the capillary to the divertor housing.

[0018] In some embodiments, for a single divertor housing, the temperature fiber Bragg grating sensor is primarily located on one side of the divertor housing.

[0019] In some embodiments, the strain / temperature monitoring components are arranged circumferentially in the vacuum chamber on 3 to 4 divertor housings selected at intervals of 80° to 120°.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the strain / temperature monitoring system of the divertor of the fusion device according to an embodiment of the present invention;

[0022] Figure 2 This is a rendering of the strain / temperature monitoring system of the divertor in a fusion device according to an embodiment of the present invention.

[0023] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0024] Figure 4 yes Figure 1 Enlarged view of point B in the middle;

[0025] Figure 5 This is a schematic diagram of the strain fiber Bragg grating sensor of the strain / temperature monitoring system of the divertor of the fusion device according to an embodiment of the present invention;

[0026] Figure 6 yes Figure 5 Enlarged view of point C in the middle;

[0027] Figure 7 This is a schematic diagram illustrating an application scenario of the strain / temperature monitoring system for the divertor of a fusion device according to an embodiment of the present invention.

[0028] Figure Labels

[0029] Vacuum chamber 1; divertor housing 2; strain / temperature monitoring assembly 3; fiber optic capillary package 301; fiber optic cable 3011; capillary 3012; strain fiber grating sensor 302; strain grating etched section 3021; ​​strain gauge package structure 3022; strain gauge 30221; connector 30222; temperature fiber grating sensor 303; fastener 304; fiber optic lead 4. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] The following is combined Figures 1 to 7 This invention describes a strain / temperature monitoring system for a divertor in a fusion device according to an embodiment of the present invention.

[0032] like Figures 1 to 7 As shown, the strain / temperature monitoring system for the divertor of a fusion device according to an embodiment of the present invention includes a strain / temperature monitoring component 3 arranged on a single divertor housing 2. It should be noted that multiple divertor housings 2 are arranged circumferentially in the vacuum chamber 1, for example, 48 divertor housings 2. Due to the large number of divertor housings 2, some are selected for arranging the strain / temperature monitoring component 3. The selected divertor housings 2 are monitored for strain / temperature in real time, comprehensively assessing the temperature and strain distribution on the surface of the divertor housing 2, and timely controlling and adjusting the divertor's operating state to avoid structural damage.

[0033] The strain / temperature monitoring component 3 includes an optical fiber capillary package 301, a strain fiber Bragg grating sensor 302, and a temperature fiber Bragg grating sensor 303. Since the divertor housing 2 is located in a harsh environment within the vacuum chamber 1, characterized by high temperature, high electromagnetic radiation, and strong electromagnetic interference, and the ultra-high vacuum environment is highly sensitive to potentially introduced impurities, traditional adhesive resistive temperature / strain sensors will fail under these conditions and may release gases that could affect the ultra-high vacuum environment. Therefore, traditional adhesive resistive temperature / strain sensors are unsuitable for monitoring data from the divertor housing 2. In contrast, the strain fiber Bragg grating sensor 302 and the temperature fiber Bragg grating sensor 303 possess high sensitivity, high accuracy, and electromagnetic interference resistance, enabling them to replace traditional adhesive resistive temperature / strain sensors for distributed strain and temperature measurement. The optical fiber 3011 within the optical fiber capillary package 301 is resistant to electromagnetic interference and can effectively transmit optical signals. Therefore, the strain / temperature monitoring component 3 can reliably and effectively monitor the strain / temperature of the divertor housing 2 under harsh environments such as high temperature, high electromagnetic radiation, and strong electromagnetic interference in the vacuum chamber 1.

[0034] Specifically, the fiber optic capillary package 301 extends from the high-field side of the divertor housing 2 (see [reference]). Figure 1 (Point A in the diagram) is fixedly arranged on the divertor housing 2 along the outer shape of the divertor housing 2, from the low field side of the divertor housing 2 (see...). Figure 1 (Point B in the diagram) is led out and passed through fiber optic lead-out line 4 (see...) Figure 2 and Figure 7 The fiber optic capillary package 301 is connected to the demodulator (not shown in the figure). Due to the complex shape and limited space of the divertor housing 2, the fiber optic capillary package 301 is very thin and flexible. It can be arranged around the outer surface (including the recessed surface) of the divertor housing 2 from the high-field side to the low-field side and fixed to the divertor housing 2. For example, the fiber optic capillary package 301 can be fixed to the divertor housing 2 by the fixing component 304. The arrangement is flexible, convenient and reasonable. After the fiber optic capillary package 301 is led out from the low-field side, it is led out through the original integrated circuit of the vacuum chamber 1 and then connected to the demodulator outside the vacuum chamber 1. This wiring is neat and does not cause interference. The fiber optic cable 3011 inside the fiber optic capillary package 301 can transmit optical signals. The demodulator can perform calculations on the optical signals to obtain the required data.

[0035] The strain fiber Bragg grating sensors 302 are distributed along the fiber capillary package 301 and pre-tightly fixed at the strain monitoring points of the divertor housing 2, with the strain monitoring points being straight. The strain monitoring points of the divertor housing 2 are densely packed, and the strain fiber Bragg grating sensors 302, mounted on the fiber capillary package 301, can be densely pre-tightly arranged at the corresponding strain monitoring points due to their small size. The strain fiber Bragg grating sensors 302 employ Bragg fiber gratings (FBGs), which are highly sensitive to changes in force. When the force changes, the grating pitch (grating period) changes on the fiber grating, causing a change in the received optical signal. By processing the optical signal using a demodulator, the strain at the corresponding strain monitoring point can be obtained. The strain fiber Bragg grating sensors 302 require a certain pre-tightening force, and the strain monitoring points must be kept straight to obtain effective strain data.

[0036] The temperature fiber Bragg grating sensor 303 is distributed along the fiber capillary package 301 and located at the temperature monitoring points in the divertor housing 2, with the temperature monitoring points being straight. The temperature fiber Bragg grating sensor 303 is mounted on the fiber capillary package 301 and can be positioned at corresponding temperature monitoring points. The temperature fiber Bragg grating sensor 303 uses a Bragg fiber grating (FBG), which is highly sensitive to changes in ambient temperature. When the ambient temperature changes, this is reflected in the fiber grating as a change in the grating pitch (grating period), causing a change in the received optical signal. By processing the optical signal using a demodulator, the temperature at the corresponding temperature monitoring point can be obtained. If the temperature monitoring point is not straight, deformation of the installation position of the temperature fiber Bragg grating sensor 303 will affect the temperature measurement results.

[0037] The fiber capillary package 301, on which the temperature fiber optic grating sensor 303 is disposed, does not have a strain fiber optic grating sensor 302 disposed (see [reference]). Figures 1 to 4 Correspondingly, the fiber capillary package 301 on which the strain fiber Bragg grating sensor 302 is arranged does not have a temperature fiber Bragg grating sensor 303. This facilitates accurate monitoring of temperature and strain.

[0038] The working principle of the strain / temperature monitoring system for the divertor of the fusion device in this embodiment of the invention is as follows: strain fiber Bragg grating sensors 302 and temperature fiber Bragg grating sensors 303 are arranged correspondingly at the strain monitoring points and temperature monitoring points of the divertor housing 2. The strain fiber Bragg grating sensors 302 and temperature fiber Bragg grating sensors 303 transmit their respective optical signals back to the demodulator through their respective corresponding fiber capillary encapsulation components 301. The demodulator performs calculations on the optical signals to obtain the strain and temperature data of the corresponding strain monitoring points and temperature monitoring points, thereby comprehensively evaluating the strain and temperature distribution on the surface of the divertor housing 2 and timely controlling and adjusting the working state of the divertor to avoid structural damage.

[0039] The strain / temperature monitoring system for the divertor of the fusion device according to this embodiment of the invention has the following advantages: 1) The strain / temperature monitoring component 3 includes an optical fiber capillary package 301, a strain fiber Bragg grating sensor 302, and a temperature fiber Bragg grating sensor 303. It has anti-electromagnetic interference capability and can monitor the strain / temperature of the divertor housing 2 in real time under harsh environments such as high temperature, high electromagnetic radiation, and strong electromagnetic interference in the vacuum chamber 1. The monitoring data is reliable and effective, which is conducive to timely processing; 2) The strain fiber Bragg grating sensor 302 and the temperature fiber Bragg grating sensor 303 can be distributed at multiple points on their respective single optical fiber capillary package 301, and due to their small size, they can be densely arranged on the surface of the divertor housing 2; 3) The strain / temperature monitoring component 3 occupies little space and can be arranged in the narrow space or area of ​​the divertor housing 2 to acquire relevant strain / temperature data.

[0040] The strain / temperature monitoring system for the divertor of the fusion device in this embodiment of the invention provides key data for monitoring the divertor housing 2 by rationally arranging multiple strain fiber Bragg grating sensors 302 and temperature fiber Bragg grating sensors 303 on the surface of the divertor housing 2. This allows for a comprehensive assessment of the temperature and strain distribution on the surface of the divertor housing 2, and timely control and adjustment of the divertor's operating state to avoid structural damage.

[0041] The strain / temperature monitoring system for the divertor of the fusion device in this embodiment of the invention is applied under harsh working environments, limited layout space, and dense monitoring points, providing a reference for similar application scenarios.

[0042] In some embodiments, such as Figure 5 and Figure 6 As shown, the fiber optic capillary package 301 includes an optical fiber 3011 and a capillary 3012 encapsulating the optical fiber 3011. The capillary 3012 encapsulates the optical fiber 3011, enabling the fiber optic capillary package 301 to be used in harsh environments such as high temperature, high electromagnetic radiation, and strong electromagnetic interference within the vacuum chamber 1. The capillary 3012 is a metal capillary 3012, preferably a 316L stainless steel capillary 3012, which possesses a certain degree of flexibility. The strain fiber Bragg grating sensor 302 includes a strain grating etched section 3021 directly formed on the optical fiber 3011, which is easy to fabricate and occupies a small space. The temperature fiber Bragg grating sensor 303 includes a temperature grating etched section (not shown in the figure) directly formed on the optical fiber 3011, which is easy to fabricate and occupies a small space.

[0043] In some embodiments, such as Figure 5 and Figure 6As shown, the strain fiber Bragg grating sensor 302 also includes a strain gauge encapsulation structure 3022; the strain grating etched section 3021 is encapsulated by the strain gauge encapsulation structure 3022 instead of the capillary tube 3012; the ends of the capillary tube 3012 near both ends of the strain grating etched section 3021 are fixed to the optical fiber 3011; the two ends of the strain gauge encapsulation structure 3022 are respectively fixed to the ends of the capillary tube 3012 near both ends of the strain grating etched section 3021 and apply prestress to the strain grating etched section 3021.

[0044] The strain grating etching section 3021 is not encapsulated by capillary tubes 3012. Instead, it is fixed to the optical fiber 3011 by the ends of the capillary tubes 3012 near both ends of the strain grating etching section 3021, and encapsulated by a strain gauge encapsulation structure 3022. When the strain gauge encapsulation structure 3022 is correspondingly fixed to the ends of the capillary tubes 3012 near both ends of the strain grating etching section 3021, the strain grating etching section 3021 is in a stretched pre-tightened state, thereby applying a certain pre-stress to the strain fiber Brazing sensor to ensure the validity of strain data measurement. The strain gauge encapsulation structure 3022 and the ends of the capillary tubes 3012 can be fixed by welding (spot welding).

[0045] In some embodiments, such as Figure 5 and Figure 6 As shown and referenced Figures 1 to 4 The strain gauge encapsulation structure 3022 is ring-shaped, including two strain gauges 30221 facing each other and two connecting parts 30222 respectively connected between the two ends of the two strain gauges 30221. One of the strain gauges 30221 is attached to the surface of the divertor housing 2. The ends of the capillaries 3012 near the two ends of the strain grating etched section 3021 are respectively fixed to the two connecting parts 30222 (such as by brazing), so that the strain grating etched section 3021 is in a tensile pre-tightened state, thereby applying a certain pre-stress to the strain fiber optic grating sensor to ensure accurate and effective strain data measurement.

[0046] When the strain fiber optic sensor 302 is arranged on the surface of the divertor housing 2, one of the two strain gauges 30221 is fixed to the surface of the divertor housing 2 by brazing.

[0047] Due to the complex shape of the divertor housing 2 and the limited layout space, the shape and size of the strain fiber Bragg grating sensor 302 are subject to high requirements while ensuring effective data monitoring. Therefore, the strain gauge encapsulation structure 3022 is designed as a ring frame, exposing the strain grating etched section 3021. This significantly reduces the length of the strain fiber Bragg grating sensor 302 (e.g., the reduced length is 30mm), making it suitable for placement within the limited space of the divertor housing 2. If the strain grating etched section 3021 were completely encapsulated, the length of the strain fiber Bragg grating sensor 302 would be much larger (e.g., 100mm), making it unsuitable for placement within the limited space of the divertor housing 2.

[0048] Furthermore, to monitor whether the temperature distribution of the divertor housing 2 is uniform during baking, the temperature monitoring points also include locations where the strain is relatively small (i.e., locations where the strain is relatively safe) and the temperature is relatively small (i.e., locations where the temperature is relatively safe), determined by simulation of various operating conditions of the divertor housing 2. These locations are those where the strain and temperature are relatively safe according to the simulation results of the divertor housing 2 (e.g.,...). Figure 1 The side of the box in the vertical section of the medium-high and low field sides is equipped with a fiber optic grating sensor 303 with a certain temperature.

[0049] In some embodiments, the temperature grating etched section is directly encapsulated in the capillary 3012, which is convenient for encapsulation.

[0050] It should be noted that the optical fiber 3011 is inserted into the capillary tube 3012 and does not interfere with the capillary tube 3012, thereby avoiding the effect of the force introduced by the deformation of the outer capillary tube 3012, which would superimpose interference on the temperature monitoring results.

[0051] In some embodiments, strain monitoring points include bends in the divertor housing 2 and locations with relatively high stress determined by simulations of various operating conditions of the divertor housing 2. Specifically, at bends in the divertor housing 2 (e.g.,...) Figure 1 The strain fiber Bragg grating sensors 302 (located at points A and B in the diagram) are primarily used to monitor the strain at the bends of the divertor housing 2 and solve for the surface stress, thus comprehensively assessing the stress condition of the divertor housing 2. By arranging the strain fiber Bragg grating sensors 302 at locations with relatively high stress, as determined by simulations of various operating conditions of the divertor housing 2, maximum strain monitoring at individual points can be performed. This allows for a more comprehensive evaluation of the strain distribution on the surface of the divertor housing 2, enabling timely control and adjustment of the divertor's operating state and preventing structural damage.

[0052] In some embodiments, temperature monitoring points include areas adjacent to the strain fiber Bragg grating sensor 302 and relatively high-temperature locations determined by simulations of various operating conditions of the divertor housing 2. Because the temperature distribution on the divertor housing 2 is uneven, the strain fiber Bragg grating sensor 302 cannot achieve temperature self-compensation. Therefore, temperature fiber Bragg grating sensors 303 are arranged in areas adjacent to the strain fiber Bragg grating sensor 302 to measure the temperature at the strain measurement location and perform temperature compensation after calculation using a demodulator. Similarly, as with maximum strain monitoring, temperature fiber Bragg grating sensors 303 are also arranged at relatively high-temperature locations determined by simulations of various operating conditions of the divertor housing 2. This allows for a more comprehensive assessment of the temperature distribution on the surface of the divertor housing 2 and timely control and adjustment of the divertor's operating state, preventing structural damage.

[0053] In some embodiments, the strain / temperature monitoring assembly 3 further includes a fixing member 304, which fixes the capillary tube 3012 to the divertor housing 2. The fixing member 304 secures the capillary tube 3012 by holding it in place and welding (e.g., brazing) the fixing member 304 to the divertor housing 2, thus ensuring reliable fixation of the capillary tube 3012 and guaranteeing the validity of the monitoring results. The fixing member 304 is arranged along the axis of the fiber optic capillary encapsulation 301 to ensure that the fiber optic cable 3011 is as straight as possible near the strain grating etching section 3021 and the temperature grating etching section, and to maintain a certain curvature at corners to prevent damage to the fiber optic cable 3011. Specifically, the fixing member 304 can be a rivet or a snap ring, but is not limited to these. The fixing member 304 is made of metal material, preferably 316L stainless steel.

[0054] By setting the fixing component 304, it is possible to ensure that the optical fiber 3011 at the measurement position is straight, reduce the deformation of the optical fiber 3011 caused by the capillary 3012, and improve the accuracy of the measurement data.

[0055] In some embodiments, for a single divertor housing 2, the temperature fiber optic grating sensor 303 is primarily located on one side of the divertor housing 2.

[0056] Because the temperature and strain of the divertor housing 2 are symmetrical, the temperature fiber optic grating sensor 303 is mainly located on one side of the divertor housing 2 to simplify the layout.

[0057] In some embodiments, the strain / temperature monitoring assembly 3 is arranged circumferentially on 3 to 4 divertor housings 2 selected at intervals of 80° to 120° in the vacuum chamber 1, in order to avoid the influence of circumferential asymmetry of plasma displacement.

[0058] Specifically, divertor housing 2 is a module with a circumferential angle of 7.5°. In order to avoid the influence of circumferential asymmetry of plasma displacement, the arrangement scheme is to perform strain / temperature monitoring on a total of 4 divertor housings 2 with a spacing of 90°.

[0059] In some embodiments, the divertor housing 2, capillary tube 3012, fastener 304, and strain gauge encapsulation structure 3022 are all made of 316 stainless steel.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A strain / temperature monitoring system for a divertor in a fusion device, characterized in that, Includes a strain / temperature monitoring assembly disposed on the divertor housing, the strain / temperature monitoring assembly comprising: An optical fiber capillary package is fixedly arranged on the divertor housing from the high field side along the outer shape of the divertor housing, and led out from the low field side of the divertor housing to be connected to the demodulator. A strain fiber Bragg grating sensor is provided, wherein the strain fiber Bragg grating sensor is distributed along the fiber capillary package and pre-tightly fixed at the strain monitoring points of the divertor housing, and the strain monitoring points are in a straight shape. A temperature fiber Bragg grating sensor is provided, wherein the temperature fiber Bragg grating sensor is distributed along the fiber capillary package and located at the temperature monitoring point of the divertor housing, and the temperature monitoring point is in a straight line; the strain fiber Bragg grating sensor is not arranged on the fiber capillary package where the temperature fiber Bragg grating sensor is arranged. The fiber capillary package includes an optical fiber and a capillary tube encapsulating the optical fiber; the strain fiber grating sensor includes a strain grating etched section directly formed on the optical fiber; the temperature fiber grating sensor includes a temperature grating etched section directly formed on the optical fiber. The strain fiber Bragg grating sensor further includes a strain gauge encapsulation structure; the strain grating etched section is encapsulated using the strain gauge encapsulation structure instead of the capillary encapsulation; the ends of the capillary near both ends of the strain grating etched section are fixed to the optical fiber; both ends of the strain gauge encapsulation structure are respectively fixed to the ends of the capillary near both ends of the strain grating etched section and apply prestress to the strain grating etched section. The strain monitoring points include the bends of the divertor housing and the areas with relatively high stress determined by simulation of various operating conditions of the divertor housing; the temperature monitoring points include the area adjacent to the strain fiber Bragg grating sensor and the areas with relatively high temperature determined by simulation of various operating conditions of the divertor housing.

2. The strain / temperature monitoring system for the divertor of a fusion device according to claim 1, characterized in that, The strain gauge encapsulation structure is ring-shaped, including two strain gauges facing each other and two connecting parts respectively connected between the two ends of the two strain gauges, one of the strain gauges being in contact with the surface of the divertor housing; the ends of the capillaries near the two ends of the strain grating etched section are respectively fixed to the two connecting parts.

3. The strain / temperature monitoring system for the divertor of a fusion device according to claim 1, characterized in that, The temperature grating etched section is directly encapsulated in the capillary.

4. The strain / temperature monitoring system for the divertor of a fusion device according to claim 1, characterized in that, The temperature monitoring points also include locations with relatively small strain determined by simulation of various operating conditions of the divertor housing, and locations with relatively small temperatures determined by simulation of various operating conditions of the divertor housing.

5. The strain / temperature monitoring system for the divertor of a fusion device according to claim 1, characterized in that, The strain / temperature monitoring assembly also includes a fixing element that secures the capillary tube to the divertor housing.

6. The strain / temperature monitoring system for the divertor of a fusion device according to any one of claims 1-5, characterized in that, For a single divertor housing, the temperature fiber Bragg grating sensor is located on one side of the divertor housing.

7. The strain / temperature monitoring system for the divertor of a fusion device according to claim 6, characterized in that, The strain / temperature monitoring components are arranged circumferentially in the vacuum chamber on 3 to 4 divertor housings selected at intervals of 80° to 120°.

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