Polychromator and Thomson scattering diagnostic system

Abstract

The present disclosure relates to a polychromator and a Thomson scattering diagnostic system. The polychromator includes a polychromator box, at least two spectral detection modules and at least two spectroscopic modules. The spectral detection modules and the spectroscopic modules are both arranged in the inner cavity of the polychromator box, and a light-transmitting hole is opened on the polychromator box. The spectral detection module includes a sealed housing, a focusing lens group and a detector. The focusing lens group and the detector are arranged in the sealed housing, and a light-transmitting hole is provided on one side of the sealed housing. The light beam selectively transmitted by the spectroscopic module is incident on the focusing lens group through the light-transmitting hole, and is focused by the focusing lens group onto the detector for detection, which can effectively prevent the invalid light beam in the polychromator box from generating optical crosstalk on the spectral detection module.

Description

Technical Field

[0001] The present disclosure relates to the technical field of spectral analysis, and in particular to a polychromator and a Thomson scattering diagnostic system. Background Art

[0002] Incoherent Thomson scattering (TS) diagnostics is an important method for measuring electron temperature and density in high-temperature plasmas. It can obtain electron temperature information by measuring the broadening of the scattered light spectrum. As the electron temperature increases, the broadening of the scattered light spectrum increases. The intensity of the scattered light is proportional to the electron density. However, due to the extremely small differential scattering cross section of Thomson scattering, the resulting scattered light signal is very low, making detection more difficult.

[0003] A polychromator is a key component of a Thomson scattering diagnostic system, used to measure and analyze extremely weak spectra. When traditional polychromators detect extremely weak light spectra, stray light from the surrounding environment easily enters the detector, affecting the results. Furthermore, the unified power supply for multiple detectors can easily cause electrical crosstalk, causing interference between detectors and affecting their normal operation. Summary of the Invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a polychromator and a Thomson scattering diagnostic system.

[0005] The present disclosure provides a polychromator, comprising a polychromator box, at least two spectrum detection modules and at least two spectroscopic modules;

[0006] The polychromator box body is provided with a light-transmitting hole. The light beam to be measured enters the polychromator box body through the light-transmitting hole, passes through the collimating lens, the first filter, and the spectrometer module, and is incident on the spectrum detection module. The spectrum detection module and the spectrometer module are both arranged in the cavity of the polychromator box body. The spectrometer module is used to selectively transmit light of a specific wavelength range in the light beam and reflect the light beam that is not transmitted.

[0007] The spectral detection module includes a focusing lens group, a detector and a sealed shell. The focusing lens group and the detector are both arranged in the sealed shell. A light hole is provided on one side of the sealed shell. The light beam selectively transmitted by the spectroscopic module is incident on the focusing lens group through the light hole, and then focused by the focusing lens group onto the detector for detection.

[0008] Optionally, a light absorbing portion is further provided in the polychromator box body, and the light absorbing portion is used to absorb invalid light beams scattered in the polychromator box body.

[0009] Optionally, it further includes a first filter and a collimating lens disposed inside the polychromator box;

[0010] The collimating lens is arranged on one side of the light transmission hole, and the first filter is arranged on the side of the collimating lens away from the light transmission hole. After the light beam enters the polychromator box, it passes through the collimating lens, the first filter and the spectroscopic module in sequence and enters the spectrum detection module.

[0011] Optionally, the light splitting module includes a relay lens and a second filter;

[0012] The second filter is arranged on the outside of the sealed housing, the relay lens is arranged on a side of the second filter away from the spectrum detection module, and the relay lens, the second filter and the light hole are coaxially arranged.

[0013] Optionally, multiple spectroscopic modules and multiple spectrum detection modules are arranged in a one-to-one correspondence to form multiple spectrum detection units, and the multiple spectrum detection units are divided into two groups, and the two groups of spectrum detection units are arranged in an interlaced manner.

[0014] Optionally, a support plate is further provided in the inner cavity of the polychromator box, a through hole is provided on the support plate that cooperates with the light-through hole, a sealed shell is arranged on one side of the support plate, the spectrometer module is arranged on the side of the through hole away from the sealed shell, and a sealing ring is provided between the through hole and the second filter of the spectrometer module.

[0015] Optionally, two support plates are provided, the two support plates are arranged in parallel, each support plate is provided with a group of spectrum detection units, and the two groups of spectrum detection units are arranged opposite to each other.

[0016] Optionally, the light absorbing portion includes a substrate and a blackened film layer;

[0017] The substrate is arranged on the inner wall of the polychromator box and on one side opposite to the two support plates, and the blackened film layer is arranged on the substrate.

[0018] Optionally, a power input terminal is provided on the detector, and the power input terminal passes through the sealed housing and is arranged at an end of the sealed housing away from the light through hole.

[0019] Optionally, the polychromator further includes multiple DC power supplies, and the power input terminals on the detectors of the multiple spectrum detection modules are connected to the multiple DC power supplies in a one-to-one correspondence.

[0020] Optionally, the back-end circuit of the detector includes a decoupling capacitor (9), which is used to provide instantaneous charge to the APD of the detector and keep the voltage constant.

[0021] The present disclosure also provides a Thomson scattering diagnostic system, comprising the polychromator described above.

[0022] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0023] The polychromator provided by the present disclosure is provided with a polychromator box body, at least two spectral detection modules and at least two spectroscopic modules, and the focusing lens group and detector in the spectral detection module are sealed in a sealed shell. The light hole is the only channel for the light beam to enter the spectral detection module. Therefore, it can effectively prevent the invalid light beam in the polychromator box from causing optical crosstalk to the spectral detection module. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0025] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 Schematic diagram of the overall structure of the polychromator according to an embodiment of the present disclosure;

[0027] Figure 2 This is a schematic diagram of the structure of the polychromator box and the support plate according to an embodiment of the present disclosure;

[0028] Figure 3 This is a schematic diagram of the structure of the spectrum detection module according to an embodiment of the present disclosure;

[0029] Figure 4 This is a schematic diagram of the support plate structure according to an embodiment of the present disclosure;

[0030] Figure 5 This is a schematic diagram of a power supply circuit for the detector according to an embodiment of the present disclosure;

[0031] Figure 6 Schematic diagram of the performance test results of the spectral detection module described in the embodiment of the present disclosure.

[0032] Among them, 1. light beam; 2. polychromator box; 21. light-transmitting hole; 3. collimating lens; 4. first filter; 5. spectrometer module; 51. relay lens; 52. second filter; 6. spectrum detection module; 61. focusing lens group; 62. detector; 621. APD; 622. signal output terminal; 623. power input terminal; 63. sealed shell; 7. support plate; 71. through hole; 72. sealing ring; 8. DC power supply; 9. decoupling capacitor; 10. first spectrum detection module; 11. resistor. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other in the absence of conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0035] The present disclosure provides a polychromator, such as Figure 1 As shown, it includes a polychromator box 2 , at least two spectrum detection modules 6 and at least two spectroscopic modules 5 .

[0036] The polychromator housing 2 can be a rectangular parallelepiped or cube-shaped structure, with a cavity formed within it. The spectral detection module 6 and the spectrometer module 5 are both disposed within the interior of the polychromator housing 2. A light-transmitting hole 21 is provided on one side of the polychromator housing 2. The light beam 1 to be measured passes through the light-transmitting hole 21 into the interior of the polychromator housing 2, and then passes through the spectrometer module 5 and into the spectral detection module 6 for detection and analysis.

[0037] The spectroscopic module 5 is used to transmit a light beam 1 of a specific wavelength and reflect the non-transmitted light beam 1 to the next spectroscopic module 5. The next spectroscopic module 5 selects the reflected light beam 1 and transmits the light beam 1 of a specific wavelength. After the light beam 1 of the specific wavelength passes through the spectroscopic module 5, it is incident on the corresponding spectrum detection module 6 for spectrum detection. Optionally, a filter can be set in the spectroscopic module 5 to select the light beam. The filter selects the light beam of a specific wavelength according to the actual detection needs. The wavelength range of the specific wavelength is 800nm-1100nm, and each polychromator box 2 can further select a specific wavelength according to its own detection needs. In this embodiment, the two spectroscopic modules 5 can select light beams of different specific wavelengths, so that the spectrum detection module 6 corresponding to each spectroscopic module 5 can detect light beams of different wavelengths as needed.

[0038] Specifically, the spectral detection module 6 includes a focusing lens group 61, a detector 62 and a sealed shell 63. The focusing lens group 61 and the detector 62 are both arranged in the sealed shell 63. A light hole is provided on one side of the sealed shell 63. The light beam 1 selectively transmitted by the spectroscopic module 5 is incident on the focusing lens group 61 through the light hole, and then is focused by the focusing lens group 61 onto the APD photosensitive surface to detect the light beam 1 selectively transmitted by the spectroscopic module 5.

[0039] The polychromator provided by the present disclosure is provided with a polychromator box body 2, at least two spectral detection modules 6 and at least two spectroscopic modules 5, and the focusing lens group 61 and the detector 62 in the spectral detection module 6 are sealed in a sealed shell 63. The light hole is the only channel for the light beam 1 to enter the spectral detection module 6. Therefore, it can effectively prevent the invalid light beam 1 in the polychromator box body 2 from generating optical crosstalk to the spectral detection module 6.

[0040] The polychromator housing 2 also includes a light-absorbing portion (not shown) for absorbing invalid light beams scattered within the polychromator housing 2 to prevent optical crosstalk with the spectrum detection module 6 and affect the detection results of the spectrum detection module 6. Invalid light beams refer to light beams 1 that do not enter the spectrum detection module 6. Furthermore, diffuse reflection or scattering due to coating uniformity issues on the relay lens 51 and the second filter 52 can also generate invalid light beams.

[0041] By providing a light absorbing portion in the polychromator box 2 , the invalid light beam 1 in the polychromator box 2 can be effectively absorbed, further reducing the optical crosstalk to the spectrum detection module 6 .

[0042] Preferably, the polychromator further comprises a first filter 4 and a collimating lens 3 arranged inside the polychromator box 2 .

[0043] The light-transmitting hole 21, the collimating lens 3 and the first filter 4 are coaxially arranged, the collimating lens 3 is arranged on one side of the light-transmitting hole 21, and the first filter 4 is arranged on the side of the collimating lens 3 away from the light-transmitting hole 21. After the light beam 1 is incident on the polychromator box body 2, it passes through the collimating lens 3, the first filter 4 and the spectroscopic module 5 in sequence, and is incident on the spectrum detection module 6.

[0044] Collimating lens 3 converts the Thomson scattered light beam 1 incident on the polychromator housing 2 into a parallel, collimated light beam 1. This allows light beam 1 to form an optical path, allowing more of it to be incident on spectral detection module 6 without randomly scattering and affecting detection by spectral detection module 6. First filter 4 is used to selectively transmit light beam 1, specifically light beam 1 within a predetermined wavelength range. After passing through light transmission aperture 21, light beam 1 sequentially passes through collimating lens 3 and first filter 4 before being incident on spectral detection module 6 for detection.

[0045] The first filter 4 is specifically a broadband filter. In this embodiment, the broadband filter can transmit the light beam 1 within a wavelength range of 800 nm to 1100 nm. By providing the broadband filter, the light beam 1 incident on the polychromator can be selectively transmitted, allowing only the light beam 1 within the desired wavelength range to pass, thereby preventing light beams 1 in other wavelength ranges from entering the spectral detection module 6 and causing optical crosstalk.

[0046] In some other embodiments, broadband filters that transmit other wavelength ranges may also be selected according to actual needs.

[0047] Specifically, the light splitting module 5 includes a relay lens 51 and a second filter 52 .

[0048] The second filter 52 is disposed outside the sealed housing 63. The relay lens 51 is disposed on a side of the second filter 52 away from the spectrum detection module 6. The relay lens 51, the second filter 52, and the light aperture are coaxially arranged. The relay lens 51 is used to focus the light beam 1 reflected from the second filter 52 and further reflect it.

[0049] The second filter 52 is specifically a narrowband filter. Light beam 1, selectively transmitted through the narrowband filter, is focused by focusing lens assembly 61. The three-dimensional adjustment mechanism of detector 62 ensures that light beam 1 is focused onto the APD photosensitive surface. The narrowband filter serves as the sole entry channel for light beam 1 into spectral detection module 6, reducing optical crosstalk within spectral detection module 6.

[0050] The narrowband filter has high transmittance for light beam 1 of a certain wavelength and high reflectivity for light beams 1 of other wavelengths. Detector 62 is specifically an APD detector, where APD stands for avalanche photodiodes. This APD detector 62 includes an APD 621 and backend circuitry. Light beam 1, selectively transmitted by the second filter 52, is focused by a focusing lens assembly 61 onto the photosensitive surface of the APD detector. The APD detector 62 converts the light beam 1 signal into an electrical signal, which is amplified by the circuitry and then output through the signal output terminal 622 of the detector 62.

[0051] Preferably, the multiple spectroscopic modules 5 are arranged in a one-to-one correspondence with the multiple spectrum detection modules 6 to form a plurality of spectrum detection units. The plurality of spectrum detection units are divided into two groups, and the two groups of spectrum detection units are staggered. Under the action of each spectroscopic module 5, the light beam 1 is selected and reflected by the spectroscopic module 5 and then incident on each spectrum detection module 6 in sequence.

[0052] Optical crosstalk occurs because the wavelength range of the light beam 1 entering the polychromator's cavity is much wider than the wavelength range transmitted by the second filter 52. As a result, the light beam 1 that does not enter the spectral detection module 6 will be reflected or scattered back and forth within the polychromator's cavity, causing interference with the spectral detection module 6. Furthermore, as the light beam 1 reflects back and forth between the multiple spectral detection units, the uniformity of the coatings on the relay lens 51 and the second filter 52 may cause diffuse reflection or scattering, which can also cause optical crosstalk.

[0053] In this embodiment, by adjusting the angles of the relay lens 51 and the second filter 52, after the second filter 52 reflects the light beam 1, the relay lens 51 can focus the light beam 1 and reflect it to another opposite and adjacent spectrum detection module 6. After receiving the light beam 1, the other spectrum detection module 6 selectively transmits and detects it, and reflects and transmits the non-transmitted light beam 1 to the next spectrum detection module 6. Similarly, under the action of the relay lens 51, the light beam 1 can be transmitted between multiple spectrum detection modules 6.

[0054] Preferably, Figure 2 and Figure 4 As shown, a support plate 7 is further provided within the inner cavity of the polychromator housing 2. The support plate 7 is provided with a through hole 71 that mates with the light-through hole. A sealed housing 63 is disposed on one side of the support plate 7, with the light-through hole extending through the through hole 71. The spectroscopic module 5 is disposed on the side of the through hole 71 away from the spectrum detection module 6. A sealing ring 72 is provided between the through hole 71 and the second filter 52 of the spectroscopic module 5. The sealing ring 72 is specifically an O-ring 72, which prevents damage to the coating on the surface of the second filter 52, thereby affecting optical performance, and further reduces optical crosstalk.

[0055] Specifically, such as Figure 2 As shown, there are two support plates 7 , which are arranged in parallel with a certain space between them. Each support plate 7 is provided with a group of spectrum detection units, and the two groups of spectrum detection units are arranged opposite to each other.

[0056] Specifically, the light-absorbing portion includes a substrate and a blackened film layer. The substrate is disposed on the inner wall of the polychromator housing 2 and on the opposite side of the two support plates 7, and the blackened film layer is disposed on the substrate. The blackened film layer prevents light beam 1 incident on the inner wall of the cavity from further reflection and absorbs ineffective light beam 1 in the polychromator cavity. After the blackening process, the blackened extinction rate on the inner wall of the cavity of the polychromator housing 2 can reach over 95%, effectively absorbing the ineffective light beam 1 in the polychromator housing 2.

[0057] Preferably, the thickness of the blackened film layer is 30 μm-60 μm.

[0058] Preferably, the substrate may be made of stainless steel.

[0059] In some other embodiments, the substrate may be made of other materials such as iron, copper, aluminum, plastic, etc. The light absorbing portion may also include other structures to absorb the light beam 1 .

[0060] In this embodiment, the number of spectral detection modules 6 and spectroscopic modules 5 is five, and one spectroscopic module 5 and one spectral detection module 6 are arranged together in a corresponding combination, wherein two spectral detection modules 6 are arranged on the support plate 7 on the side close to the light-transmitting hole 21, and three spectral detection modules 6 are arranged on the support plate 7 on the side away from the light-transmitting hole 21. The support plate 7 is provided with a plurality of through holes 71 that cooperate with the plurality of spectral detection modules 6. The two groups of spectral detection modules 6 are arranged in an interlaced manner. The specific wavelength range of the light beam 1 transmitted by the second filter 52 on each spectroscopic module 5 can be selected according to actual needs. The first filter 4 and the collimating lens 3 are arranged on the support plate 7 on the side close to the light-transmitting hole 21. The collimating lens 3 is arranged on the side of the support plate 7 close to the light-transmitting hole 21, and the first filter 4 is arranged on the other side. The through hole 71 on the support plate 7 is arranged between the first filter 4 and the collimating lens 3 to ensure the normal transmission of the light beam 1.

[0061] After the light beam 1 is transmitted to the second filter 52, the O-ring 72 ensures that the through hole 71 of the support plate 7 and the second filter 52 are tightly fitted, preventing the invalid light beam 1 from entering the spectrum detection module 6 and avoiding the influence of the invalid light beam 1 on the spectrum detection module 6.

[0062] Preferably, the O-ring 72 is made of rubber. In other embodiments, the structure of the sealing ring 72 can also be set according to actual needs, and the sealing ring 72 can also be made of other materials that can achieve a sealing effect.

[0063] In this embodiment, each spectrum detection module 6 is fully sealed, thereby reducing optical crosstalk between multiple spectrum detection modules 6 .

[0064] Preferably, Figure 3 As shown, the detector 62 is provided with a power input terminal 623 , which passes through the sealed housing 63 and is arranged at one end of the sealed housing 63 away from the light-through hole.

[0065] The polychromator also includes multiple DC power supplies 8. The power input terminals 623 of the detectors 62 on the multiple spectral detection modules 6 are connected to the multiple DC power supplies 8 in a one-to-one correspondence, so that the DC power supplies 8 can independently power each detector 62. The DC power supplies 8 are connected in series with the resistor 11. By decoupling the DC power supplies 8, the multiple detectors 62 are independently powered, effectively reducing circuit crosstalk between the multiple detectors 62. Compared to the prior art method of uniformly powering all detectors 62 in a polychromator, the independent power supply prevents problems with some spectral detection modules 6 while other spectral detection modules 6 can continue to perform normal measurements, thereby improving detection stability and efficiency.

[0066] Further, such as Figure 5As shown, the detector's back-end circuitry includes a decoupling capacitor 9, which is used to provide instantaneous charge to the detector's APD 621 while maintaining a constant voltage. Because the duration of the light beam 1 entering the spectral detection module 6 is on the order of nanoseconds, the decoupling capacitor 9 is used to instantaneously power the detectors 62. Compared to existing methods that directly supply high-voltage power to all detectors 62, this instantaneous power supply from the decoupling capacitor 9 results in more stable and low-noise operation for each detector 62 in the spectral detection module 6.

[0067] In order to test the accuracy of the polychromator, this embodiment conducted relevant experiments under the conditions of the polychromator vacuum degree of 10 -6 Pa, laser energy 1J / 50Hz, wavelength 1064nm. For the sake of convenience, the spectrum detection module 6 that the light beam 1 first enters is called the first spectrum detection module 6. The central wavelength of the second filter 52 in the spectroscopic module 5 corresponding to the first spectrum detection module 6 is 1064nm. Figure 6 As shown in the experimental results, the voltages of the other spectral detection modules 6 remain constant over time, hovering around 0 mV, while the first spectral detection module 6 exhibits significant voltage fluctuations, reaching a maximum of over 500 mV. This demonstrates that the polychromator provided in this embodiment effectively prevents the effects of optical and circuit crosstalk on the spectral detection modules 6.

[0068] The present disclosure also provides a Thomson scattering diagnostic system, including the aforementioned polychromator. By incorporating the polychromator provided in this embodiment into the Thomson scattering diagnostic system, the problem of ineffective light beams within the polychromator housing generating optical crosstalk with the spectral detection modules 6 can be effectively resolved. Furthermore, even if problems occur in some spectral detection modules 6, other spectral detection modules 6 can still perform normal measurements, thereby improving detection stability and efficiency.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0070] The foregoing description is intended only to provide specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the embodiments described herein, but rather to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A polychromator, characterized in that: It comprises a polychromator box (2), at least two spectrum detection modules (6) and at least two spectroscopic modules (5); The polychromator box body (2) is provided with a light-transmitting hole (21), and the light beam to be measured (1) is incident on the polychromator box body (2) through the light-transmitting hole (21), and passes through the light-splitting module (5) and is incident on the spectrum detection module (6). The spectrum detection module (6) and the light-splitting module (5) are both arranged in the inner cavity of the polychromator box body (2), and the light-splitting module (5) is used to selectively transmit light of a specific wavelength range in the light beam (1) and reflect the light beam (1) that is not transmitted; The spectrum detection module (6) comprises a focusing lens group (61), a detector (62) and a sealed housing (63); the focusing lens group (61) and the detector (62) are both arranged in the sealed housing (63); a light hole is provided on one side of the sealed housing (63); the light beam (1) selectively transmitted by the light splitting module (5) is incident on the focusing lens group (61) through the light hole, and then is focused by the focusing lens group (61) onto the detector (62) for detection; The light splitting module (5) comprises a relay lens (51) and a second filter (52); The second filter (52) is arranged outside the sealed housing (63), the relay lens (51) is arranged on a side of the second filter (52) away from the spectrum detection module (6), and the relay lens (51), the second filter (52) and the light hole are coaxially arranged; The plurality of light splitting modules (5) and the plurality of spectrum detection modules (6) are arranged in a one-to-one correspondence to form a plurality of spectrum detection units. The plurality of spectrum detection units are divided into two groups, and the two groups of spectrum detection units are arranged in an interlaced manner.

2. The polychromator according to claim 1, wherein: A light absorbing portion is further provided in the polychromator box body (2), and the light absorbing portion is used to absorb invalid light beams scattered in the polychromator box body (2).

3. The polychromator according to claim 1, wherein: It also includes a first filter (4) and a collimating lens (3) arranged inside the polychromator box (2); The collimating lens (3) is arranged on one side of the light-transmitting hole (21), and the first filter (4) is arranged on a side of the collimating lens (3) away from the light-transmitting hole (21). After the light beam (1) is incident on the polychromator box (2), it passes through the collimating lens (3), the first filter (4) and the spectroscopic module (5) in sequence and is incident on the spectrum detection module (6).

4. The polychromator according to claim 2, wherein: A support plate (7) is further provided in the inner cavity of the polychromator box body (2), and a through hole (71) is provided on the support plate (7) to cooperate with the light-through hole. The spectrum detection module (6) is arranged on one side of the support plate (7), and the spectroscopic module (5) is arranged on a side of the through hole (71) away from the spectrum detection module (6). A sealing ring (72) is provided between the through hole (71) and the second filter (52) of the spectroscopic module (5).

5. The polychromator according to claim 4, wherein: The number of the support plates (7) is two, the two support plates (7) are arranged in parallel, each support plate (7) is provided with a group of spectrum detection units, and the two groups of spectrum detection units are arranged opposite to each other.

6. The polychromator according to claim 4, wherein: The light absorbing part includes a substrate and a blackened film layer; The substrate is arranged on the inner wall of the polychromator box body (2) and on a side opposite to the two support plates (7), and the blackened film layer is arranged on the substrate.

7. The polychromator according to claim 1, wherein: The detector (62) is provided with a power input end (623), which passes through the sealed housing (63) and is arranged at an end of the sealed housing (63) away from the light hole.

8. The polychromator according to claim 7, wherein: The polychromator further comprises a plurality of DC power supplies (8), and the power input terminals (623) of the detectors (62) of the plurality of spectrum detection modules (6) are connected to the plurality of DC power supplies (8) in a one-to-one correspondence.

9. The polychromator according to claim 8, wherein: The back-end circuit of the detector (62) includes a decoupling capacitor (9), and the decoupling capacitor (9) is used to provide instantaneous charge to the APD (621) of the detector (62) to maintain a constant voltage.

10. A Thomson scattering diagnostic system comprising the polychromator according to any one of claims 1 to 9.

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