A multi-branch simultaneous calibration device and method for the transmittance of a scattered light diagnostic system

Abstract

The present invention discloses a multi-branch simultaneous calibration device and method for the transmittance of a scattered light diagnostic system, including a calibration light source, an optical fiber, a focusing lens, a diffuse scattering target, a workbench, and a power meter. The diffuse scattering target is arranged at the center of a target chamber, and the calibration laser is focused onto the diffuse scattering target through the optical fiber and the focusing lens through the light-transmitting window of the target chamber, generating uniform scattered light covering multiple branches. The workbench drives the light-receiving mirror assembly and the power meter to synchronously match the scattered light path, combines with the second power meter to monitor the light intensity in real time, and calculates the response efficiency of each branch based on the Lambert reflection principle. The present invention realizes multi-branch simultaneous calibration, solves the problems of low efficiency and poor precision of traditional methods, and significantly improves the calibration speed and accuracy of scattered light diagnostic systems of large laser devices.

Description

Technical Field

[0001] The present invention relates to the field of laser inertial confinement fusion experiment diagnosis, and more particularly to a multi-branch simultaneous calibration device and method for the transmittance of a scattered light diagnostic system. Background Art

[0002] In laser inertial confinement fusion (ICF) and high energy density physics (HEDP) experiments, accurate diagnosis of backscattered light energy is a key step in evaluating the interaction between laser and target material. Large laser devices are usually equipped with multiple scattered light diagnostic branches (such as stimulated Brillouin scattering SBS, stimulated Raman scattering SRS, etc.), which require periodic calibration to ensure the accuracy of the response efficiency of each branch. The traditional calibration method mainly relies on fine laser beam calibration technology. The specific process is: through the target reflector or manually entering the target chamber to place an auxiliary laser, the fine laser beam is reversed into the diagnostic light path, and the total transmittance is measured using an energy meter. However, this method has significant defects:

[0003] Insufficient spot coverage: The aperture of the fine laser beam is limited (usually in the millimeter range) and cannot evenly cover the incident laser components (the aperture can reach the meter level). As a result, the transmittance of some areas is not effectively calibrated, introducing systematic errors.

[0004] High operational complexity: Adjusting the reflector angle or manually positioning the laser branch by branch is time-consuming and prone to human error. For a device with dozens of branches, the calibration cycle can take several days, severely limiting experimental efficiency.

[0005] Uneven distribution of light source intensity: Even if the laser spot is expanded to cover the components, its Gaussian distribution characteristics differ from the uniform scattered light field in the experiment, causing the calibration results to deviate from the actual working conditions.

[0006] While recent research has attempted to generate calibration light sources using diffuse reflectors, traditional methods remain unable to address the problem of simultaneous multi-branch calibration due to the geometric limitations of spot size and target chamber distance. Therefore, there is an urgent need to develop a method that can quickly and accurately perform simultaneous multi-branch online calibration to meet the efficient experimental requirements of large-scale laser devices. Summary of the Invention

[0007] In order to overcome the defects of the existing technology that the simultaneous calibration of multiple branches cannot be solved, and the existing calibration methods are difficult to operate and have low calibration accuracy, the present invention provides a device and method for simultaneous calibration of multiple branches of the transmittance of a scattered light diagnostic system.

[0008] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0009] The present invention provides a multi-branch simultaneous calibration device for the transmittance of a scattered light diagnostic system, comprising a calibration light source, an optical fiber, a focusing lens, and a diffuse scattering target; the calibration light source, optical fiber, and focusing lens are sequentially coupled along an incident light path; the diffuse scattering target is disposed in the central area of ​​a target chamber and surrounded by a target chamber wall, wherein a light-transmitting window is disposed on the target chamber wall; the focusing lens focuses an incident light beam generated by the calibration light source through the light-transmitting window onto the surface of the diffuse scattering target, thereby forming multiple backscattering light paths;

[0010] An optical terminal, a light-collecting mirror assembly, an energy meter, a workbench, and a first power meter are arranged along the direction of the first backscattered light path. The optical terminal is used to capture scattered light. The light-collecting mirror assembly, the energy meter, and the first power meter are all arranged on the workbench. The workbench drives the light-collecting mirror assembly, the energy meter, and the first power meter to match the first backscattered light path.

[0011] A second power meter is provided along the second backscattered light path for monitoring the power of scattered light in the second backscattered light path;

[0012] A first electric baffle and a second electric baffle are also provided on the target chamber wall; the first electric baffle is provided on the light-transmitting window of the incident light path between the focusing lens and the diffuse scattering target, and the second electric baffle is provided on the light-transmitting window of the backscattering light path of the diffuse scattering target; the first electric baffle and the second electric baffle are both used to perform the light path on-off switching operation of the corresponding light-transmitting windows.

[0013] Preferably, the laser wavelengths output by the calibration light source include 351 nm and 532 nm, corresponding to the wavelengths of the first calibration mode and the second calibration mode, respectively.

[0014] Preferably, the surface of the diffuse scattering target is provided with a diffuse reflection coating for making the reflected light into a near diffuse reflection state, and the incident light strikes the surface of the diffuse scattering target to form a circular light spot.

[0015] Preferably, the diameter D of the circular light spot and the working distance L from the center of the circular light spot to the optical terminal meet .

[0016] The present invention also provides a calibration method for a multi-branch simultaneous calibration device for transmittance of a scattered light diagnostic system, the method comprising:

[0017] Move the energy meter out of the optical path to be calibrated using a workbench, and position the first power meter at the acquisition node of the optical path to be calibrated;

[0018] Start the calibration light source and couple it to the optical fiber, and select the incident light with the corresponding wavelength according to the type of branch to be calibrated;

[0019] After the incident light is converged by the focusing lens, the second electric baffle is synchronously translated to a light path connection state, and the incident light passes through the light-transmitting window of the target chamber wall and is incident on the diffuse scattering target;

[0020] The incident light generates backscattered light through the diffuse scattering target, and the first electric baffle is synchronously translated to a light path connection state. The backscattered light reaches the second power meter, and the monitoring power of the monitoring calibration light is obtained by the second power meter;

[0021] The backscattered light is transmitted to the first power meter of each branch through the optical terminal and the light receiving mirror assembly of each branch to obtain the calibrated optical power of the optical terminal and the light receiving mirror assembly of each branch;

[0022] The response efficiency of each branch is calculated by substituting the monitoring power of the monitoring calibration light, the calibration light power of each branch optical terminal and the light receiving mirror assembly, the angle between the optical terminal of each branch and the diffuse scattering target, and the solid angle into the preset correlation expression;

[0023] When the response efficiency in each branch reaches the preset response efficiency, the calibration operation of each branch is completed.

[0024] Preferably, the monitoring power of the monitoring calibration light is:

[0025]

[0026] in, is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

[0027] Preferably, the backscattered light passes through the light-receiving mirror assembly of each branch, and the luminous intensity of the backscattered light received by the light-receiving mirror assembly of each branch is obtained, specifically:

[0028]

[0029] in, is the angle between the measurement direction and the diffuse scattering target; is the luminous intensity per unit solid angle in the normal direction of the diffuse scattering target; is the angle between the diffuse scattering target and the normal Luminous intensity per unit solid angle in a direction.

[0030] Preferably, the calibrated optical power of each branch light receiving mirror assembly is determined according to the luminous intensity of the backscattered light received by the light receiving mirror assembly, specifically:

[0031] The angle between the measurement direction and the diffuse scattering target is When , the calibrated optical power of each branch light receiving mirror assembly is:

[0032]

[0033] When the solid angle between the light collecting mirror assembly and the diffuse scattering target is When , the calibrated optical power of each branch light receiving mirror assembly is:

[0034]

[0035] in, is the total calibrated light power received by the light receiving mirror assembly; is the value range of the light collecting mirror assembly at the polar angle; is the azimuth angle of the light-receiving mirror assembly, the azimuth angle of the light-receiving mirror assembly satisfy .

[0036] Preferably, the calibrated optical power of the backscattered light received by the optical terminal of the branch is:

[0037]

[0038] in, For the The calibrated optical power received by the branch; For the The solid angle of each branch to the diffuse scattering target; For the The angle between the branch and the normal of the diffuse scattering target; is the number of branches; is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

[0039] Preferably, the response efficiency of the branch is expressed as follows:

[0040]

[0041] in, For the The response efficiency of each branch; For the The calibrated optical power received by the first power meter; is the number of branches; is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

[0042] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0043] The present invention proposes a multi-branch simultaneous calibration device and method for the transmittance of a scattered light diagnostic system. Through an innovative multi-branch synchronous calibration method, the present invention solves the problems of low efficiency, poor accuracy and complex operation of traditional calibration methods, and significantly improves the calibration efficiency and accuracy of scattered light diagnostic systems of large laser devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic structural diagram of the multi-branch simultaneous calibration device for the transmittance of the scattered light diagnostic system described in Example 1;

[0045] Figure 2 This is a flow chart of the multi-branch simultaneous calibration method for the transmittance of the scattered light diagnostic system described in Example 3.

[0046] Description of reference numerals:

[0047] 1. Calibration light source; 2. Optical fiber; 3. Focusing lens; 4. Diffuse scattering target; 5. Target chamber; 6. Target chamber wall; 7. Light-transmitting window; 8. Optical terminal; 9. Light-collecting mirror assembly; 10. Energy meter; 11. Workbench; 12. First power meter; 13. Second power meter; 14. First electric baffle; 15. Second electric baffle. DETAILED DESCRIPTION

[0048] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting this patent;

[0049] In order to better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size;

[0050] It is understandable to those skilled in the art that some well-known structures and descriptions thereof may be omitted in the drawings.

[0051] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0052] Example 1

[0053] This embodiment provides a multi-branch simultaneous calibration device for the transmittance of a scattered light diagnostic system, such as Figure 1 As shown, it includes a calibration light source 1, an optical fiber 2, a focusing lens 3 and a diffuse scattering target 4; the calibration light source 1, optical fiber 2 and focusing lens 3 are coupled in sequence along the incident light path; the diffuse scattering target 4 is arranged in the central area of ​​a target chamber 5 and is surrounded by a target chamber wall 6, and a light-transmitting window 7 is provided on the target chamber wall 6; the focusing lens 3 focuses the incident light beam generated by the calibration light source 1 through the light-transmitting window 7 onto the surface of the diffuse scattering target 4, forming multiple backscattering light paths;

[0054] Among them, an optical terminal 8, a light-collecting mirror assembly 9, an energy meter 10, a workbench 11 and a first power meter 12 are arranged along the direction of the first backscattered light path. The optical terminal 8 is used to capture scattered light; the light-collecting mirror assembly 9, the energy meter 10 and the first power meter 12 are all arranged on the workbench 11, and the workbench 11 drives the light-collecting mirror assembly 9, the energy meter 10 and the first power meter 12 to perform three-dimensional translation to match the first backscattered light path;

[0055] A second power meter 13 is provided along the second backscattered light path for monitoring the power of scattered light in the second backscattered light path;

[0056] A first electric baffle 14 and a second electric baffle 15 are also provided on the target chamber wall 6; the first electric baffle 14 is provided on the light-transmitting window 7 of the incident light path between the focusing lens 3 and the diffuse scattering target 4, and the second electric baffle 15 is provided on the light-transmitting window 7 of the backscattering light path of the diffuse scattering target 4; the first electric baffle 14 and the second electric baffle 15 are both used to perform the light path on-off switching operation of the corresponding light-transmitting window 7.

[0057] Example 2

[0058] This embodiment provides a multi-branch simultaneous calibration device for the transmittance of a scattered light diagnostic system, comprising a calibration light source 1, an optical fiber 2, a focusing lens 3, and a diffuse scattering target 4. The calibration light source 1, optical fiber 2, and focusing lens 3 are sequentially coupled along an incident light path. The diffuse scattering target 4 is disposed in the center of a target chamber 5 and surrounded by a target chamber wall 6, which has a light-transmitting window 7. The focusing lens 3 focuses the incident light beam generated by the calibration light source 1 through the light-transmitting window 7 onto the surface of the diffuse scattering target 4, forming multiple backscattering light paths.

[0059] Among them, an optical terminal 8, a light-collecting mirror assembly 9, an energy meter 10, a workbench 11 and a first power meter 12 are arranged along the direction of the first backscattered light path. The optical terminal 8 is used to capture scattered light; the light-collecting mirror assembly 9, the energy meter 10 and the first power meter 12 are all arranged on the workbench 11, and the workbench 11 drives the light-collecting mirror assembly 9, the energy meter 10 and the first power meter 12 to perform three-dimensional translation to match the first backscattered light path;

[0060] A second power meter 13 is provided along the second backscattered light path for monitoring the power of scattered light in the second backscattered light path;

[0061] A first electric baffle 14 and a second electric baffle 15 are also provided on the target chamber wall 6; the first electric baffle 14 is provided on the light-transmitting window 7 of the incident light path between the focusing lens 3 and the diffuse scattering target 4, and the second electric baffle 15 is provided on the light-transmitting window 7 of the backscattering light path of the diffuse scattering target 4; the first electric baffle 14 and the second electric baffle 15 are both used to perform the light path on-off switching operation of the corresponding light-transmitting window 7.

[0062] The laser wavelengths output by the calibration light source 1 include 351 nm and 532 nm, which correspond to the wavelengths of the first calibration mode and the second calibration mode, respectively.

[0063] The surface of the diffuse scattering target 4 is provided with a diffuse reflection coating for making the reflected light nearly diffusely reflected. The incident light hitting the surface of the diffuse scattering target 4 forms a circular light spot.

[0064] The diameter D of the circular light spot and the working distance L from the center of the circular light spot to the optical terminal 8 satisfy .

[0065] Example 3

[0066] This embodiment also provides a multi-branch simultaneous calibration method for the transmittance of a scattered light diagnostic system, which is applied to the multi-branch simultaneous calibration device for the transmittance of a scattered light diagnostic system, such as Figure 2 As shown, the method includes:

[0067] Move the energy meter 10 out of the optical path to be calibrated through the workbench 11, and position the first power meter 12 to the collection node of the optical path to be calibrated;

[0068] Start calibration light source 1 and couple it to optical fiber 2. Select the output wavelength according to the type of branch to be calibrated. When calibrating the stimulated Brillouin scattering branch, output the incident light with a wavelength of 351nm; when calibrating the stimulated Raman scattering branch, output the incident light with a wavelength of 532nm.

[0069] After the incident light is converged by the focusing lens 3, the second electric baffle 15 is synchronously translated to a light path connection state, and the incident light passes through the light-transmitting window 7 of the target chamber wall 6 and is incident on the diffuse scattering target 4;

[0070] The incident light generates backscattered light through the diffuse scattering target 4, and the first electric baffle 14 is synchronously translated to the optical path connection state. The backscattered light reaches the second power meter 13, and the second power meter 13 is used to obtain the monitoring power of the monitoring calibration light;

[0071] The backscattered light is transmitted to the first power meter 12 of each branch through the optical terminal 8 and the light receiving mirror assembly 9 of each branch to obtain the calibrated optical power of each branch optical terminal 8 and the light receiving mirror assembly 9;

[0072] The response efficiency of each branch is calculated by substituting the monitoring power of the monitoring calibration light, the calibration light power of each branch optical terminal 8 and the light receiving mirror assembly 9, the angle and solid angle between each branch optical terminal 8 and the diffuse scattering target 4 into the preset correlation expression;

[0073] When the response efficiency in each branch reaches the preset response efficiency, the calibration operation of each branch is completed.

[0074] The monitoring power of the monitoring calibration light is:

[0075]

[0076] in, is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

[0077] The backscattered light passes through the light-receiving mirror assembly 9 of each branch, and the luminous intensity of the backscattered light received by the light-receiving mirror assembly 9 of each branch is obtained, specifically:

[0078]

[0079] in, is the angle between the measurement direction and the diffuse scattering target; is the luminous intensity per unit solid angle in the normal direction of the diffuse scattering target; is the angle between the diffuse scattering target and the normal Luminous intensity per unit solid angle in a direction.

[0080] The calibrated optical power of each branch light receiving mirror assembly 9 is determined according to the luminous intensity of the backscattered light received by the light receiving mirror assembly 9, specifically:

[0081] The angle between the measurement direction and the diffuse scattering target is When , the calibrated optical power of each branch light receiving mirror assembly 9 is:

[0082]

[0083] When the solid angle between the light collecting mirror assembly 9 and the diffuse scattering target 4 is When , the calibrated optical power of each branch light receiving mirror assembly 9 is:

[0084]

[0085] in, is the total calibrated light power received by the light receiving mirror assembly; is the value range of the light collecting mirror assembly at the polar angle; is the azimuth angle of the light-receiving mirror assembly, the azimuth angle of the light-receiving mirror assembly satisfy .

[0086] The light intensity in the normal direction is:

[0087]

[0088] The calibrated optical power of the backscattered light received by the optical terminal 8 of the branch is:

[0089]

[0090] in, For the The calibrated optical power received by the branch; For the The solid angle of each branch to the diffuse scattering target; For the The angle between the branch and the normal of the diffuse scattering target; is the number of branches; is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

[0091] The response efficiency formula of the branch is:

[0092]

[0093] in, For the The response efficiency of each branch; For the The calibrated optical power received by the first power meter; is the number of branches; is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

[0094] The same or similar reference numerals correspond to the same or similar components;

[0095] The terms used in the drawings to describe positional relationships are for illustrative purposes only and should not be construed as limiting this patent;

[0096] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-branch simultaneous calibration device for the transmittance of a scattered light diagnostic system, characterized in that: The invention comprises a calibration light source (1), an optical fiber (2), a focusing lens (3) and a diffuse scattering target (4); the calibration light source (1), the optical fiber (2) and the focusing lens (3) are coupled in sequence along the incident light path; the diffuse scattering target (4) is arranged in the central area of ​​a target chamber (5) and is surrounded by a target chamber wall (6), and a light-transmitting window (7) is provided on the target chamber wall (6); the focusing lens (3) focuses the incident light beam generated by the calibration light source (1) onto the surface of the diffuse scattering target (4) through the light-transmitting window (7), thereby forming a plurality of backscattering light paths; An optical terminal (8), a light-collecting mirror assembly (9), an energy meter (10), a workbench (11), and a first power meter (12) are arranged along the direction of the first backscattering light path, wherein the optical terminal (8) is used to capture scattered light; the light-collecting mirror assembly (9), the energy meter (10), and the first power meter (12) are all arranged on the workbench (11), and the workbench (11) drives the light-collecting mirror assembly (9), the energy meter (10), and the first power meter (12) to match the first backscattering light path; A second power meter (13) is provided along the direction of the second backscattered light path, for monitoring the power of scattered light in the second backscattered light path; A first electric baffle (14) and a second electric baffle (15) are also provided on the target chamber wall (6); the first electric baffle (14) is provided on the light-transmitting window (7) of the incident light path between the focusing lens (3) and the diffuse scattering target (4), and the second electric baffle (15) is provided on the light-transmitting window (7) of the backscattering light path of the diffuse scattering target (4); the first electric baffle (14) and the second electric baffle (15) are both used to perform an on-off switching operation of the light path of the corresponding light-transmitting window (7).

2. The multi-branch simultaneous calibration device for transmittance of a scattered light diagnostic system according to claim 1, characterized in that: The laser wavelengths output by the calibration light source (1) include 351 nm and 532 nm, corresponding to the wavelengths of the first calibration mode and the second calibration mode, respectively.

3. The multi-branch simultaneous calibration device for transmittance of a scattered light diagnostic system according to claim 1, characterized in that: The surface of the diffuse scattering target (4) is provided with a diffuse reflection coating for making the reflected light into a near diffuse reflection state, and the incident light strikes the surface of the diffuse scattering target (4) to form a circular light spot.

4. The multi-branch simultaneous calibration device for transmittance of a scattered light diagnostic system according to claim 3, characterized in that: The diameter D of the circular light spot and the working distance L from the center of the circular light spot to the optical terminal (8) satisfy .

5. A multi-branch simultaneous calibration method for the transmittance of a scattered light diagnostic system, characterized in that: The method is applied to the multi-branch simultaneous calibration device for transmittance of a scattered light diagnostic system according to any one of claims 1 to 4, comprising: The energy meter (10) is moved out of the optical path to be calibrated via a workbench (11), and the first power meter (12) is positioned at a collection node of the optical path to be calibrated; Starting the calibration light source (1) and coupling it to the optical fiber (2), and selecting the incident light with the corresponding wavelength to output according to the type of the branch to be calibrated; After the incident light is converged by the focusing lens (3), the second electric baffle (15) is synchronously translated to a light path connection state, and the incident light passes through the light-transmitting window (7) of the target chamber wall (6) and is incident on the diffuse scattering target (4); The incident light generates backscattered light through the diffuse scattering target (4), and the first electric baffle (14) is synchronously translated to a light path connected state, and the backscattered light reaches the second power meter (13), and the monitoring power of the monitoring calibration light is obtained by using the second power meter (13); The backscattered light is transmitted to the first power meter (12) of each branch through the optical terminal (8) and the light receiving mirror assembly (9) of each branch, and the calibrated optical power of the optical terminal (8) and the light receiving mirror assembly (9) of each branch is obtained; Calculate the response efficiency of each branch by substituting the monitoring power of the monitoring calibration light, the calibration light power of each branch optical terminal (8) and the light receiving mirror assembly (9), the angle and solid angle between each branch optical terminal (8) and the diffuse scattering target (4) into a preset correlation expression; When the response efficiency in each branch reaches the preset response efficiency, the calibration operation of each branch is completed.

6. The multi-branch simultaneous calibration method for the transmittance of a scattered light diagnostic system according to claim 5, characterized in that: The monitoring power of the monitoring calibration light is: in, is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

7. The multi-branch simultaneous calibration method for the transmittance of a scattered light diagnostic system according to claim 5, characterized in that: The backscattered light passes through the light-receiving mirror assembly (9) of each branch, and the luminous intensity of the backscattered light received by the light-receiving mirror assembly (9) of each branch is obtained, specifically: in, is the angle between the measurement direction and the diffuse scattering target; is the luminous intensity per unit solid angle in the normal direction of the diffuse scattering target; is the angle between the diffuse scattering target and the normal Luminous intensity per unit solid angle in a direction.

8. The multi-branch simultaneous calibration method for the transmittance of a scattered light diagnostic system according to claim 7, characterized in that: The calibrated optical power of each branch light receiving mirror assembly (9) is determined according to the luminous intensity of the backscattered light received by the light receiving mirror assembly (9), specifically: The angle between the measurement direction and the diffuse scattering target (4) is When , the calibrated optical power of each branch light receiving mirror assembly (9) is: When the solid angle between the light collecting mirror assembly (9) and the diffuse scattering target (4) is When , the calibrated optical power of each branch light receiving mirror assembly (9) is: in, is the total calibrated light power received by the light receiving mirror assembly; is the value range of the light collecting mirror assembly at the polar angle; is the azimuth angle of the light-receiving mirror assembly, the azimuth angle of the light-receiving mirror assembly satisfy .

9. The multi-branch simultaneous calibration method for the transmittance of a scattered light diagnostic system according to claim 5, characterized in that: The calibrated optical power of the backscattered light received by the optical terminal (8) of the branch is: in, For the The calibrated optical power received by the branch; For the The solid angle of each branch to the diffuse scattering target; For the The angle between the branch and the normal of the diffuse scattering target; is the number of branches; is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

10. The multi-branch simultaneous calibration method for transmittance of a scattered light diagnostic system according to claim 5, characterized in that: The response efficiency formula of the branch is: in, For the The response efficiency of each branch; For the The calibrated optical power received by the first power meter; is the number of branches; is the calibrated optical power received by the second power meter; is the solid angle of the second power meter to the diffuse scattering target; is the angle between the second power meter and the normal of the diffuse scattering target.

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