Optical fiber fixing device and radioactive sample analysis system

Abstract

The utility model discloses an optical fiber fixing device and a radioactive sample analysis system. The optical fiber fixing device comprises a sleeve and a fixing unit. A containing cavity is formed in the middle of the sleeve in a penetrating mode and used for allowing an optical fiber to penetrate through. The fixing unit comprises a first mounting base and a second mounting base, and the first mounting base and the second mounting base are oppositely arranged and connected with the two ends of the sleeve correspondingly. The central axes of the first mounting base, the second mounting base and the sleeve are located on the same extension line, and the two ends of the optical fiber penetrate through and are fixed to the first mounting base and the second mounting base respectively. At least one of the first mounting seat and the second mounting seat is a rotating seat, the rotating seat can rotate around the central axis of the sleeve, and the rotating seat is used for driving one end part of the optical fiber to rotate around the central axis of the sleeve, so that the optical fiber is twisted and bent. The optical fiber fixing device can effectively fix the optical fiber in the sleeve, and can prevent rays from directly irradiating through the optical fiber or the aperture of the optical fiber.

Description

Technical Field

[0001] The utility model specifically relates to an optical fiber fixing device and a radioactive sample analysis system. Background Art

[0002] Quartz optical fiber has the characteristics of low loss and long-distance transmission of optical signals. Optical signals are transmitted in optical fibers using the principle of total reflection of light. For elemental spectrometry measurement of highly radioactive samples, it is necessary to transmit the signal generated by the light source to the position of the sample to be measured through optical fiber. The absorbed light after passing through the sample can be transmitted to the spectrometer through optical fiber. By analyzing the information such as the absorption peak intensity and wavelength of the optical signal, the spectroscopic measurement of the sample content can be achieved.

[0003] In the existing radioactive sample elemental spectrometry measurement, the fixation of optical fiber in the analysis device is not specifically considered. Usually, optical fiber is only used as a transmission medium for optical signals and is positioned and arranged like a cable. In the existing optical fiber fixing structure, the radioactive rays generated by highly radioactive samples can easily pass directly through the optical fiber, causing radiation damage to the environment or personnel. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an optical fiber fixing device and a radioactive sample analysis system in view of the above-mentioned deficiencies in the prior art. The optical fiber fixing device can effectively fix the optical fiber in the sleeve and prevent the rays from directly irradiating through the optical fiber or the optical fiber aperture.

[0005] According to an embodiment of the first aspect of the utility model, there is provided an optical fiber fixing device, comprising: a sleeve and a fixing unit. A receiving cavity is provided through the middle of the sleeve, and the receiving cavity is used for the optical fiber to pass through. The fixing unit comprises a first mounting seat and a second mounting seat, and the first mounting seat and the second mounting seat are arranged opposite to each other and are respectively connected to the two end portions of the sleeve. The first mounting seat, the second mounting seat and the central axis of the sleeve are on the same extension line. The two end portions of the optical fiber are respectively passed through the first mounting seat and the second mounting seat, and the first mounting seat and the second mounting seat are respectively provided with a first optical fiber fixing member and a second optical fiber fixing member, and the first optical fiber fixing member and the second optical fiber fixing member are respectively used to fix the two end portions of the optical fiber; at least one of the first mounting seat and the second mounting seat is a rotating seat, and the rotating seat can rotate around the central axis of the sleeve, and the rotating seat is used to drive one end portion of the optical fiber to rotate around the central axis of the sleeve, so that the optical fiber is twisted and bent.

[0006] Preferably, a first optical fiber channel is provided on the first mounting seat, the first optical fiber channel is eccentrically arranged on the first mounting seat, the first optical fiber channel extends along the axial direction of the sleeve and passes through the first mounting seat, and a second optical fiber channel is provided on the second mounting seat, the second optical fiber channel is eccentrically arranged on the second mounting seat, the second optical fiber channel extends along the axial direction of the sleeve and passes through the second mounting seat, and both end portions of the optical fiber are respectively inserted into the first optical fiber channel and the second optical fiber channel.

[0007] Preferably, the first optical fiber fixing part is threadedly connected to the first optical fiber channel; a first through hole is provided in the middle of the first optical fiber fixing part, the first through hole extends along the central axis direction of the first optical fiber channel and passes through the first optical fiber fixing part; the second optical fiber fixing part is threadedly connected to the second optical fiber channel, a second through hole is provided in the middle of the second optical fiber fixing part, the second through hole extends along the central axis direction of the second optical fiber channel and passes through the second optical fiber fixing part; the first through hole and the second through hole are used for allowing the two end portions of the optical fiber to pass through and respectively clamping the two end portions of the optical fiber.

[0008] Preferably, the first mounting seat and the second mounting seat are also used to close the openings at both ends of the accommodating cavity, and the accommodating cavity is filled with a filler in a granular form for limiting the displacement of the optical fiber in the sleeve.

[0009] Preferably, the filler is iron sand or lead sand.

[0010] Preferably, the rotating seat is connected to the sleeve via a bearing, the bearing is located between the rotating seat and the sleeve, and the center line of the bearing is on the same axis as the center lines of the rotating seat and the sleeve, the inner ring of the bearing is connected to the rotating seat, and the outer ring of the bearing is connected to the sleeve, so that the rotating seat can rotate around the center axis of the sleeve.

[0011] Preferably, the sleeve comprises an outer shielding body and an inner cylinder, the outer shielding body surrounds the outer side of the inner cylinder and is connected to the inner cylinder, and the rotating seat is connected to the outer shielding body of the sleeve through a bearing.

[0012] According to an embodiment of the second aspect of the utility model, there is provided a radioactive sample analysis system, comprising a shielding chamber, an optical fiber, a measuring chamber and the optical fiber fixing device described in the embodiment of the first aspect; a mounting flange is provided on the top wall of the shielding chamber, the measuring chamber is located in the shielding chamber, and is used to accommodate radioactive samples, and the measuring chamber is opposite to the mounting flange; a sleeve of the optical fiber fixing device is located between the mounting flange and the measuring chamber, one end of which is connected to the mounting flange, and the other end is connected to the measuring chamber, the optical fiber passes through the mounting flange and the sleeve in sequence, and extends into the measuring chamber, the optical fiber is used to transmit a light signal emitted by an external light source to the radioactive sample, the light signal passes through the radioactive sample to form a feedback signal, and the optical fiber is also used to transmit the feedback signal of the radioactive sample to a spectrometer for elemental spectral analysis.

[0013] Preferably, the optical fiber is bent in a spiral shape or an arc shape.

[0014] Preferably, the optical fiber is a single-path optical fiber or a dual-path optical fiber.

[0015] The optical fiber fixing device of the utility model fixes the two ends of the optical fiber respectively through two mounting seats (first mounting seat and second mounting seat) located at the two ends of the sleeve, thereby achieving the fixation of the optical fiber. Specifically, the optical fiber fixing device sets at least one of the mounting seats as a rotating seat. In the process of fixing the optical fiber, firstly, the two ends of the optical fiber are passed through the optical fiber channels of the first mounting seat and the second mounting seat, and then, by rotating the rotating seat, one end of the optical fiber is driven to rotate, so that the optical fiber is twisted into a spiral bend or an arc shape. After the optical fiber is adjusted to a suitable bending curvature, the two ends of the optical fiber are completely fixed by the optical fiber fixing member, thereby completing the fixation of the optical fiber. The optical fiber is in a twisted and bent state, which can prevent the radioactive rays generated by the strong radioactive sample from being directly irradiated through the optical fiber, and further prevent the strong radioactive rays from being directly irradiated through the transmission channel of the optical fiber to the operating station of the measuring device, and further cause radiation damage to the environment or personnel. Moreover, the two mounting seats can also seal the accommodating cavity of the sleeve to prevent the strong radioactive rays from penetrating through the accommodating cavity of the sleeve. Therefore, the optical fiber fixing device can effectively fix the optical fiber in the sleeve and prevent the rays from being directly irradiated through the optical fiber or the optical fiber aperture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an optical fiber fixing device when a single optical fiber is fixed in some embodiments of the utility model;

[0017] Figure 2 is a schematic structural diagram of an optical fiber fixing device when fixing a single optical fiber in some other embodiments of the utility model;

[0018] Figure 3 It is a schematic structural diagram of an optical fiber fixing device when fixing dual optical fibers in some other embodiments of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the optical fiber fixing member in some embodiments of the utility model.

[0020] In the figure: 1-first optical fiber fixing part, 2-mounting flange, 3-bearing, 4-rotating seat (bearing seat), 5-inner cylinder, 6-optical fiber, 61-incident optical fiber, 62-exiting optical fiber, 7-outer shielding body, 8-O-ring, 9-second optical fiber fixing part, 10-measuring chamber, 11-optical fiber armored sheath, 12-optical fiber connector, 13-pressure ring, 14-tightening nut, 15-base. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", "installation", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0025] Example 1

[0026] See also Figure 1 and Figure 2 The utility model discloses an optical fiber fixing device, comprising a sleeve and a fixing unit.

[0027] The middle of the sleeve is provided with a through-going accommodating cavity, and the accommodating cavity is used for the optical fiber 6 to pass through. The fixing unit includes a first mounting seat and a second mounting seat, which are arranged opposite to each other and are respectively connected to the two end portions of the sleeve, and the central axis of the first mounting seat, the second mounting seat and the sleeve are on the same extension line, and the two end portions of the optical fiber 6 are respectively passed through the first mounting seat and the second mounting seat. The first optical fiber fixing part 1 and the second optical fiber fixing part 9 are respectively provided on the first mounting seat and the second mounting seat, and the first optical fiber fixing part 1 and the second optical fiber fixing part 9 are respectively used to fix the two end portions of the optical fiber 6. At least one of the first mounting seat and the second mounting seat is a rotating seat 4, which can rotate around the central axis of the sleeve, and the rotating seat 4 is used to drive one end portion of the optical fiber 6 to rotate around the central axis of the sleeve, so that the optical fiber is twisted and bent.

[0028] It should be noted that if Figure 1 and Figure 2 As shown, the optical fiber fixing device fixes the ends of the optical fiber 6 respectively through two mounting seats (i.e., the first mounting seat and the second mounting seat) located at the two ends of the sleeve, thereby fixing the optical fiber 6. Specifically, the optical fiber fixing device sets at least one of the mounting seats as a rotating seat 4. In other words, the first mounting seat or the second mounting seat can be set as a rotating seat 4, such as Figure 1 and Figure 2 The first mounting seat and the second mounting seat can also be configured as rotating seats, such as Figure 3 As shown. Preferably, the rotating seat 4 can adopt a bearing seat. Specifically, the rotating seat 4 is connected to the sleeve through the bearing 3, the bearing 3 is located between the rotating seat 4 and the sleeve, and the center line of the bearing 3 is on the same axis as the center line of the rotating seat 4 and the sleeve, the inner ring of the bearing 3 is connected to the rotating seat 4, and the outer ring of the bearing 3 is connected to the sleeve, so that the rotating seat 4 can rotate around the central axis of the sleeve.

[0029] like Figure 1 , Figure 2 The optical fiber fixing device can be used to fix the optical fiber of a single optical fiber transmission structure. Figure 3 As shown, the optical fiber fixing device can also be used to fix the optical fiber of a dual optical fiber transmission structure. Furthermore, the optical fiber fixing device can also be used to fix the optical fiber of three or more multi-optical fiber transmission structures, as long as enough optical fiber channels are opened on the mounting base.

[0030] In this embodiment, the mounting seat is provided with an optical fiber channel. Specifically, the first mounting seat is provided with a first optical fiber channel, which is eccentrically arranged on the first mounting seat. The first optical fiber channel extends along the axial direction of the sleeve and passes through the first mounting seat. The second mounting seat is provided with a second optical fiber channel, which is eccentrically arranged on the second mounting seat, which extends along the axial direction of the sleeve and passes through the second mounting seat. The two end portions of the optical fiber 6 are respectively penetrated in the first optical fiber channel and the second optical fiber channel.

[0031] It is easy to understand that an eccentric distance is set between the central axis of the optical fiber channel and the central axis of the mounting seat. The advantage is that when the rotating seat 4 rotates, the end of the optical fiber 6 connected to the rotating seat 4 will rotate around the central axis of the rotating seat 4, eventually forming a spiral bend or an arc-shaped bend.

[0032] In this embodiment, the first optical fiber fixture 1 is threadedly connected to the first optical fiber channel. A first through hole is provided in the middle of the first optical fiber fixture 1, and the first through hole extends along the central axis direction of the first optical fiber channel and penetrates the first optical fiber fixture 1. The second optical fiber fixture 9 is threadedly connected to the second optical fiber channel, and a second through hole is provided in the middle of the second optical fiber fixture 9, and the second through hole extends along the central axis direction of the second optical fiber channel and penetrates the second optical fiber fixture 9. The first through hole and the second through hole are used for passing the ends of the optical fiber through, and clamping the ends of the optical fiber respectively.

[0033] The first optical fiber fixture and the second optical fiber fixture have the same structure, so both are described together. The central axis of the optical fiber fixture 1 extends along the axial direction of the optical fiber channel, the outer wall of the optical fiber fixture 1 is provided with an external threaded portion, the inner wall of the optical fiber channel is provided with an internal threaded portion, and the external threaded portion of the optical fiber fixture 1 is connected to the internal threaded portion of the optical fiber channel by a thread.

[0034] Specifically, Figure 4 As shown, the optical fiber fixing member 1 includes an optical fiber connector 12, a pressure ring 13, a compression nut 14 and a base 15. The structure of the optical fiber fixing member 1 is as follows Figure 4 As shown, the outside of the optical fiber 6 is wrapped with an optical fiber armor coating 11 to protect the optical fiber 6 from damage. The end of the optical fiber 6 is fixedly connected to an optical fiber connector 12, and the outer wall of the optical fiber connector 12 is cylindrical and has an external threaded portion. The external threaded portion of the optical fiber connector 12 is threadedly connected to the internal threaded portion of the optical fiber channel. Further, as shown in FIG. Figure 4As shown, the end of one end of the optical fiber connector 12 is provided with a circular plug-in portion, and the plug-in portion extends in the vertical direction. The plug-in portion of the optical fiber connector 12 is inserted into the base 15 of the optical fiber fixture 1 along with the optical fiber 6. The optical fiber connector 12 is initially in contact with the pressure ring 13 of the optical fiber fixture 1 fixed on the base 15, and then the optical fiber fixture 1 clamping nut 14 is screwed on. The pressure brought by the clamping nut 14 makes the optical fiber connector 12 and the pressure ring 13 of the optical fiber fixture 1 closely contact and fix, so that the optical fiber connector 12, the pressure ring 13 and the base 15 clamp the optical fiber 6, thereby realizing the structural fixation between the optical fiber 6 and the optical fiber fixture 1. The through hole of the above-mentioned optical fiber fixture 1 passes through the optical fiber connector 12, the pressure ring 13, the base 15 and the clamping nut 14 in sequence.

[0035] The specific working process of the optical fiber fixing device is described below: In the process of fixing the optical fiber 6, firstly, the two ends of the optical fiber 6 are passed through the optical fiber channels of the mounting seat, that is, the two ends are passed through the first optical fiber channel and the second optical fiber channel respectively. Then, by rotating the rotating seat 4, one end of the optical fiber 6 is driven to rotate, so that the optical fiber 6 is twisted and bent. Preferably, the optical fiber 6 is bent in a spiral shape or an arc shape. Figure 1 is a schematic diagram of the optical fiber 6 being twisted into a spiral bend, Figure 2 Schematic diagram of the optical fiber 6 being twisted into an arc shape. Further, the staff can control the twist shape of the optical fiber 6 by controlling the rotation angle of the rotating seat 4. For example, the staff can rotate the rotating seat 4 360° to make the optical fiber 6 twisted into an arc shape. Figure 1 For example, the operator can rotate the rotating seat 4 by 180° to twist the optical fiber 6 into a spiral shape. Figure 2 Of course, the rotation angle of the optical fiber 6 needs to be determined according to the torsional curvature that the optical fiber 6 itself can achieve.

[0036] After the optical fiber 6 is adjusted to a suitable curvature, the ends of the optical fiber 6 are completely fixed by the optical fiber fixing member 1, thereby completing the fixation of the optical fiber 6. This is because during the twisting process of the optical fiber 6, the length of the optical fiber 6 in the sleeve must be greater than the length when the optical fiber 6 is arranged in a straight line, and as the degree of twisting of the optical fiber 6 increases, the length of the optical fiber 6 in the sleeve will also increase. Therefore, it is necessary to fix the ends of the optical fiber 6 after the adjustment of the curvature of the optical fiber 6 is completed, so that the curvature of the optical fiber 6 can be adjusted more conveniently.

[0037] The optical fiber 6 is in a twisted and bent state, which can prevent the radioactive rays generated by the strong radioactive sample from being directly emitted through the optical fiber 6, and thus can prevent the strong radioactive rays from being directly emitted through the transmission channel of the optical fiber 6 to the operating position of the measuring device, and further causing radiation damage to the environment or personnel. In addition, the two mounting seats can also seal the accommodating cavity of the sleeve to prevent the strong radioactive rays from penetrating through the accommodating cavity of the sleeve.

[0038] In addition, since the optical cable may shake or move inside the sleeve, in order to prevent the optical fiber 6 from being affected by external force or vibration, thereby causing looseness or damage. In this embodiment, the first mounting seat and the second mounting seat are also used to close the openings at both ends of the accommodating cavity, and the accommodating cavity of the sleeve is filled with a filler, which is granular and is used to limit the displacement of the optical fiber 6 in the sleeve. Preferably, the filler is iron sand or lead sand. On the one hand, it can fix the optical fiber 6, and on the other hand, it can also shield and block the radioactive rays in the strong radioactive environment where the sleeve is located.

[0039] like Figure 1 As shown, the sleeve includes an outer shielding body 7 and an inner cylinder 5, the outer shielding body 7 surrounds the outer side of the inner cylinder 5 and is connected to the inner cylinder 5, and the rotating seat 4 is connected to the outer shielding body 7 of the sleeve through the bearing 3. By arranging the outer shielding body 7 on the outer side of the inner cylinder 5, it is possible to effectively reduce or block the radiation leakage into the surrounding environment, improve the radiation safety of the workplace, and protect the health of operators and surrounding personnel. In addition, by arranging the outer shielding body 7, it is also possible to reduce the radiation interference of the surrounding environment, that is, reduce the interference of the external environment on the internal measurement or experiment, and ensure the accuracy and reliability of the measurement results. Furthermore, the main structure of the optical fiber sleeve is cylindrical, and the material can be selected from stainless steel, and the optical fiber 6 for optical signal transmission is arranged inside. The diameter of the optical fiber sleeve is related to the spiral structure of the selected optical fiber 6.

[0040] Therefore, the optical fiber fixing device can effectively fix the optical fiber 6 in the sleeve and prevent the rays from directly passing through the optical fiber 6 or the aperture of the optical fiber 6.

[0041] This optical fiber fixing device is suitable for all scenarios where the optical fiber 6 needs to be fixed, and is particularly suitable for the measurement scenario of elemental spectrometry of radioactive samples in a strong radiation environment. In the field of nuclear chemical spectral measurement technology, in response to the need for spectroscopic analysis of elemental content in highly radioactive samples, the use of optical fiber spectroscopy can achieve long-distance measurement of samples. The signal generated by the light source is transmitted to the position of the sample to be measured through the optical fiber 6. The absorbed light after passing through the sample can be transmitted to the spectrometer through the optical fiber 6. By analyzing the information such as the absorption peak intensity and wavelength of the optical signal, the spectroscopic measurement of the sample content can be achieved.

[0042] In this regard, it should be noted that for elemental spectrometry measurements of highly radioactive samples, the optical fiber 6 needs to be arranged in a certain sleeve structure and fixed, and the phenomenon of direct radiation of radioactive rays through the optical fiber hole should be avoided as much as possible. In the existing elemental spectrometry measurements of radioactive samples, the fixation of the optical fiber 6 in the analysis device is not specifically considered. Usually, the optical fiber 6 is only used as a transmission medium for optical signals and is positioned and arranged like a cable. Such an arrangement method easily causes the optical fiber 6 to be affected by external forces or vibrations, thereby causing the optical fiber 6 to loosen or be damaged. In addition, the existing optical fiber fixing structure does not provide a solution to the situation where the radioactive rays generated by highly radioactive samples are directly emitted through the optical fiber.

[0043] Therefore, in order to solve the above problems, it is necessary to provide a fixing structure for the optical fiber in the sleeve, which can not only effectively fix the optical fiber in the sleeve, but also prevent the rays from directly passing through the optical fiber or the optical fiber aperture, thereby meeting the radiation protection requirements of a strong radioactive environment.

[0044] See also Figure 1 , Figure 2 and Figure 3 In this embodiment, the optical fiber fixing device is equivalent to a fixing structure of an optical fiber in a sleeve. The optical fiber fixing device mainly solves the stability and safety problems of optical fiber transmission of optical signals in a strong radioactive environment, and includes: an optical fiber sleeve, in which an optical fiber 6 for optical signal transmission is arranged. The overall arrangement of the optical fiber 6 is a regular quasi-spiral shape, and its port is fixed on a bearing seat. The bearing seat (i.e., the rotating seat 4 mentioned above) is located at least at one end of the optical fiber sleeve, and is used to integrate and fix the port of the optical fiber 6. In other words, at least one of the two mounting seats (the first mounting seat and the second mounting seat) is a bearing seat (i.e., the rotating seat 4). The optical fiber fixing device arranges the optical fiber in a regular quasi-spiral shape inside the optical fiber sleeve, and uses a bearing seat and a filler to fix and protect the optical fiber.

[0045] The optical fiber 6 is arranged in a quasi-helical manner inside the sleeve, which can prevent strong radioactive rays from being directly irradiated to the operating station of the measuring device through the transmission channel of the optical fiber 6 when the optical fiber 6 is arranged in a straight line, and further causing radiation damage to the environment or personnel. Moreover, the optical fiber 6 arranged in a quasi-helical manner is provided with an armor coating layer on the outside to provide structural protection for the optical fiber 6 and constrain the shape of the optical fiber 6 to present a quasi-helical arrangement. The optical fiber 6 is used for optical signal transmission during the measurement process, and its overall arrangement includes a single helical structure of a single optical fiber or a double helical structure of a double optical fiber, which is arranged inside the optical fiber sleeve, and at least one end of the optical fiber port is integrated and fixed on the bearing seat.

[0046] The optical fiber 6 is arranged inside the optical fiber sleeve, and its main structure is cylindrical. The gap between the optical fiber 6 and the sleeve is used to fill the filler. A bearing seat is set at at least one end of the optical fiber sleeve for connecting and fixing the optical fiber port. The filler can be iron sand or lead sand. On the one hand, it plays a role in fixing the optical fiber 6, and on the other hand, it can play a role in shielding and blocking radioactive rays in the strong radioactive environment where the sleeve is located. The bearing seat is used to integrate and fix the optical fiber port. It is at least arranged at one end of the optical fiber sleeve and connected and combined with it. The bearing seat structure is mainly made of stainless steel, and the optical fiber port is fixed by integrating and fixing the optical fiber fixing part 1. The optical fiber sleeve is connected and combined with the bearing seat, and the upper and lower sealing structures are adopted as the whole to ensure the sealing of the structure. The sealing structure is realized by the bearing seat, flange and optical fiber sleeve using flat gasket sealing.

[0047] See also Figure 1 and Figure 2 In some embodiments, the optical fiber 6 is a single-channel optical fiber. Specifically, the optical fiber 6 in the optical fiber sleeve is set as a single optical fiber transmission structure, and the sleeve body structure is composed of a sleeve outer shield 7, a bearing 3 and a sleeve assembly (inner sleeve 5).

[0048] When the sleeve has a single optical fiber transmission structure, the working principle of the optical fiber fixing device is as follows:

[0049] The bearing 3 can drive the bearing seat and the flange to rotate under the drive of the external motor, so that the necessary installation and fixation between the bearing seat and the sleeve assembly can be achieved. The optical fiber 6 can be selected to adopt a single optical fiber optical path, that is, the incident light and the outgoing light are transmitted through the same optical fiber 6. Figure 1 As shown, the optical fiber 6 can be arranged in a regular single helical structure in the sleeve. Figure 2 As shown, the optical fiber 6 can also be arranged in a curved structure with a certain curvature in the sleeve. The upper end of the optical fiber 6 is integrated and fixed in the bearing seat through the optical fiber fixing member 1, and the lower end is fixed and connected to the measuring chamber 10 through the optical fiber fixing member 1. Filling (iron sand or lead sand) is poured into the inside of the optical fiber sleeve, and the whole is placed inside the sleeve shell. The optical fiber sleeve adopts an upper and lower sealing structure as a whole, and the measuring chamber 10 and the mounting seat at the lower end of the optical fiber sleeve are sealed by an O-ring 8.

[0050] According to maintenance and replacement requirements, the upper end of the flange can be fixed with an external pull ring by welding or bolts. When the optical fiber sleeve is replaced, after removing the motor, motor mounting seat and coupling connected to the outside of the optical fiber sleeve, the external pull ring can be used to pull out the optical fiber sleeve as a whole through an external lifting device for replacement.

[0051] See also Figure 3In some other embodiments, the optical fiber 6 is a dual-path optical fiber. Specifically, the optical fiber 6 in the optical fiber sleeve is set as a dual-fiber transmission structure, and the sleeve body structure is composed of a sleeve outer shield 7, a bearing 3 and a sleeve assembly (inner sleeve 5).

[0052] When the sleeve has a dual optical fiber transmission structure, the working principle of the optical fiber fixing device is as follows:

[0053] Optical fiber 6 can be selected to adopt a dual optical fiber optical path, which is arranged in a regular double helix structure in the optical fiber sleeve. The dual optical fiber optical path is specifically divided into an incident optical fiber 61 and an output optical fiber 62. The upper and lower ends of the optical fiber 6 are integrated and fixed in the bearing seat through the optical fiber fixing part 1, and the lower end is connected to the measuring chamber 10. The upper and lower bearing seats are respectively connected to the two bearings 3, and are supported and fixed by the upper and lower bearings 3 respectively to realize the rotation function. The optical fiber sleeve adopts an upper and lower sealing structure as a whole, and fillers (iron sand or lead sand) are poured into it. The replacement method of the dual optical fiber sleeve is basically the same as that of the single optical fiber sleeve.

[0054] In summary, compared with the existing common optical fiber 6 fixing structure, the optical fiber fixing device has the following advantages:

[0055] The optical fiber 6 is arranged in a spiral shape in the sleeve, and at least one end thereof is integrated and fixed to the bearing seat. The bearing seat is driven by the bearing 3 to achieve fixation and tight connection with the optical fiber sleeve by rotation, which can effectively prevent strong radioactive rays from directly irradiating through the optical fiber 6 and causing radiation damage to the environment or personnel. A bearing seat is set at at least one end of the optical fiber sleeve, and the optical fiber 6 is integrated and fixed by the optical fiber fixing member 1, and a filler (iron sand or lead sand) is poured into the internal gap of the optical fiber sleeve. The bearing seat and the optical fiber sleeve are connected and combined to form a sealing structure, which effectively enhances the overall stability of the structure while reducing the risk of loosening of the optical fiber 6 due to external force or vibration, and enhances the stability and safety of optical signal transmission.

[0056] Example 2

[0057] The utility model also discloses a radioactive sample analysis system, comprising a shielding chamber, an optical fiber 6, a measuring chamber 10 and the optical fiber fixing device in the first embodiment.

[0058] Among them, a mounting flange 2 is provided on the top wall of the shielding chamber, and a measuring chamber 10 is located in the shielding chamber for accommodating radioactive samples, and the measuring chamber 10 is directly opposite to the mounting flange 2. The sleeve of the optical fiber fixing device is located between the mounting flange 2 and the measuring chamber 10, one end of which is connected to the mounting flange 2, and the other end is connected to the measuring chamber 10. The optical fiber 6 passes through the mounting flange 2 and the sleeve in sequence, and extends into the measuring chamber 10. The optical fiber 6 is used to transmit the optical signal emitted by the external light source to the radioactive sample, and the optical signal passes through the radioactive sample to form a feedback signal. The optical fiber 6 is also used to transmit the feedback signal of the radioactive sample to the spectrometer for elemental spectrum analysis.

[0059] It should be noted that the radioactive sample analysis system is an online analysis and measurement device. That is, the measurement chamber is connected to the liquid inlet pipe of the radioactive sample, which is used to continuously circulate the radioactive sample. Then, the signal generated by the light source is transmitted to the position of the sample to be measured through the optical fiber 6, and the absorbed light after passing through the sample can be transmitted to the spectrometer through the optical fiber 6. By analyzing the information such as the absorption peak intensity and wavelength of the light signal, the spectroscopic measurement of the sample content can be achieved.

[0060] Specifically, the optical fiber fixing device in Example 1 is a fixing structure of an optical fiber in a sleeve, which can effectively solve the technical problems existing when the optical fiber is fixed in the sleeve in the spectroscopic measurement of highly radioactive sample elements. The optical fiber fixing device mainly includes: a sleeve and a mounting seat. The main structure of the optical fiber sleeve is cylindrical, and the material can be stainless steel, and the optical fiber 6 for optical signal transmission is arranged inside. The outer layer of the optical fiber 6 adopts a metal armor structure to protect the optical fiber 6, and constrains the shape of the optical fiber 6 to make it present a regular spiral arrangement, and its bending radius is related to the core diameter of the optical fiber 6. Specifically, the use of an optical fiber 6 with a smaller core diameter can obtain a relatively small bending radius and thus be applied to the optical fiber sleeve. In other words, the smaller the core diameter of the optical fiber 6, the greater its degree of bendability is generally, that is, the curvature that the optical fiber 6 can achieve will be better. Preferably, the core diameter of the optical fiber 6 is 10-50μm, and here, the core diameter of the optical fiber 6 can be selected to be 15μm.

[0061] The diameter of the optical fiber sleeve is related to the spiral structure of the selected optical fiber 6. The bearing seat is located at least at one end of the optical fiber sleeve, and is used to integrate and fix the optical fiber 6 port. The main body of the optical fiber 6 is located inside the optical fiber sleeve. At least one end of the light port is integrated and fixed to the bearing seat through the optical fiber fixing member 1. The internal gap of the optical fiber sleeve is filled with fillers such as iron sand or lead sand. The optical fiber 6 is arranged in a single spiral or double spiral structure. The quasi-spiral optical fiber 6 should have a larger bending radius in the sleeve. The outside of the optical fiber sleeve can be wrapped with a shielding body. The optical fiber sleeve can adopt an upper and lower sealing structure.

[0062] The working principle of this radioactive sample analysis system is as follows:

[0063] First, the staff drives the rotating seat 4 (bearing seat) to rotate by a motor or manually, so that the end of the optical fiber 6 connected to the rotating seat 4 rotates around the central axis of the rotating seat 4, thereby twisting the optical fiber 6 into a spiral bend or an arc bend. At this time, it can effectively prevent strong radioactive rays from directly passing through the optical fiber 6 and causing radiation damage to the environment or personnel. Then, the end of the optical fiber 6 is fixed to the mounting seat by the optical fiber fixing member 1. In addition, the sleeve of the optical fiber fixing device is filled with a filler to limit the displacement of the optical fiber 6 in the sleeve.

[0064] When the spectrum measurement starts, a light signal is emitted by an external light source, and the optical fiber 6 is used to transmit the light signal emitted by the external light source to the position of the sample to be measured. When the light signal passes through the sample to be measured, the radioactive sample absorbs part of the light signal to form a feedback signal. The optical fiber 6 is also used to transmit the feedback signal to the spectrometer to achieve spectroscopic measurement of the sample content.

[0065] In summary, this radioactive sample analysis system has the following advantages:

[0066] 1. It can effectively prevent strong radioactive rays from directly irradiating through the optical fiber 6 and causing radiation damage to the environment or personnel.

[0067] 2. The sleeve is filled with iron sand or lead sand, which can fix the optical fiber 6 to prevent it from loosening or being damaged, and can also shield and block radioactive rays in the highly radioactive environment where the sleeve is located.

[0068] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An optical fiber fixing device, characterized in that: Includes: sleeve and fixing unit, A receiving cavity is provided through the middle of the sleeve, and the receiving cavity is used for the optical fiber (6) to pass through. The fixing unit comprises a first mounting seat and a second mounting seat, the first mounting seat and the second mounting seat are arranged opposite to each other and are respectively connected to the two end portions of the sleeve, the central axis of the first mounting seat, the second mounting seat and the sleeve are on the same extension line, and the two end portions of the optical fiber (6) are respectively passed through the first mounting seat and the second mounting seat. A first optical fiber fixing member (1) and a second optical fiber fixing member (9) are respectively provided on the first mounting seat and the second mounting seat, wherein the first optical fiber fixing member (1) and the second optical fiber fixing member (9) are respectively used to fix the two end portions of the optical fiber (6). At least one of the first mounting seat and the second mounting seat is a rotating seat (4), which can rotate around the central axis of the sleeve, and the rotating seat (4) is used to drive one end of the optical fiber (6) to rotate around the central axis of the sleeve, so that the optical fiber is twisted and bent.

2. The optical fiber fixing device according to claim 1, characterized in that: A first optical fiber channel is provided on the first mounting seat, the first optical fiber channel is eccentrically arranged on the first mounting seat, and the first optical fiber channel extends along the axial direction of the sleeve and penetrates the first mounting seat. A second optical fiber channel is provided on the second mounting seat, the second optical fiber channel is eccentrically arranged on the second mounting seat, and the second optical fiber channel extends along the axial direction of the sleeve and penetrates the second mounting seat. Both end portions of the optical fiber (6) are respectively inserted into the first optical fiber channel and the second optical fiber channel.

3. The optical fiber fixing device according to claim 2, characterized in that: The first optical fiber fixing member (1) is threadedly connected to the first optical fiber channel. A first through hole is provided in the middle of the first optical fiber fixing member (1), the first through hole extends along the central axis direction of the first optical fiber channel and passes through the first optical fiber fixing member (1). The second optical fiber fixing member (9) is threadedly connected to the second optical fiber channel. A second through hole is provided in the middle of the second optical fiber fixing member (9). The second through hole extends along the central axis direction of the second optical fiber channel and passes through the second optical fiber fixing member (9). The first through hole and the second through hole are used for allowing the ends of the optical fiber to pass through, and for clamping both ends of the optical fiber respectively.

4. The optical fiber fixing device according to claim 1, characterized in that: The first mounting seat and the second mounting seat are also used to close the openings at both ends of the accommodating cavity. The accommodating cavity is filled with a filler in the form of particles and is used to limit the displacement of the optical fiber (6) in the sleeve.

5. The optical fiber fixing device according to claim 4, characterized in that: The filler is iron sand or lead sand.

6. The optical fiber fixing device according to claim 1, characterized in that: The rotating seat (4) is connected to the sleeve via a bearing (3); the bearing (3) is located between the rotating seat (4) and the sleeve, and the center line of the bearing (3) is on the same axis as the center lines of the rotating seat (4) and the sleeve; the inner ring of the bearing (3) is connected to the rotating seat (4), and the outer ring of the bearing (3) is connected to the sleeve, so that the rotating seat (4) can rotate around the center axis of the sleeve.

7. The optical fiber fixing device according to claim 6, characterized in that: The sleeve comprises an outer shielding body (7) and an inner cylinder (5); the outer shielding body (7) surrounds the outer side of the inner cylinder (5) and is connected to the inner cylinder (5); the rotating seat (4) is connected to the outer shielding body (7) of the sleeve via a bearing (3).

8. A radioactive sample analysis system, characterized in that: It comprises a shielding box chamber, an optical fiber (6), a measuring chamber (10) and the optical fiber fixing device according to any one of claims 1 to 7, A mounting flange (2) is provided on the top wall of the shielding chamber. The measuring chamber (10) is located in the shielding chamber and is used to accommodate radioactive samples. The measuring chamber (10) is directly opposite to the mounting flange (2). The sleeve of the optical fiber fixing device is located between the mounting flange (2) and the measuring chamber (10), one end of which is connected to the mounting flange (2) and the other end of which is connected to the measuring chamber (10). The optical fiber passes through the mounting flange (2) and the sleeve in sequence and extends into the measuring chamber (10). The optical fiber is used to transmit the light signal emitted by the light source to the radioactive sample. The light signal passes through the radioactive sample to form a feedback signal. The optical fiber is also used to transmit the feedback signal of the radioactive sample to the spectrometer for elemental spectral analysis.

9. The radioactive sample analysis system according to claim 8, characterized in that: The optical fiber (6) is bent in a spiral shape or an arc shape.

10. The radioactive sample analysis system according to claim 8, characterized in that: The optical fiber (6) is a single-path optical fiber or a dual-path optical fiber.

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