Compact non-vacuum thermoelectric refrigeration device for spectrometer CCD (Charge Coupled Device)

Abstract

The invention belongs to the technical field of refrigeration type spectrometers, and relates to a compact non-vacuum thermoelectric refrigeration device for a spectrograph CCD (charge coupled device), which comprises a window heat conduction cover, a window glass plate, a CCD pressing plate, a cavity shell, a heat insulation layer, a CCD detector, a TEC (thermoelectric cooler) thermoelectric refrigeration sheet and an air cooling fin seat which are sequentially arranged along a spectrum incidence direction, the window glass plate is blocked on the spectrum incidence channel, the window glass plate seals and isolates one side, facing the rear cylinder opening, in the cavity shell cylinder into an independent closed cavity, and the refrigeration surface of the TEC thermoelectric refrigeration sheet is attached to the CCD detector; the closed space where the CCD detector cavity is located is set to be small, the small-size TEC thermoelectric refrigeration unit is adopted in the small space, the interior of the closed space is cooled, heat is conducted to the external air cooling fin base, and therefore the low-temperature environment in the closed space is guaranteed, and the measurement precision of the refrigeration type spectrograph can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration spectrometers, and in particular relates to a compact non-vacuum thermoelectric refrigeration device for a CCD of a spectrometer. Background Art

[0002] With the development of my country's optoelectronic detection instrument industry, the performance of various spectrometers is becoming increasingly important. With the development of high-precision CCD (Charge-Coupled Device) detectors, cooling the CCD array detector is an effective means to reduce dark noise, while increasing the dynamic range of the detector and improving the detection limit.

[0003] According to actual observations, if the sensor in the spectrometer is a linear array CCD module, when the integration time exceeds 1 second, the CCD will be submerged in its own dark current, and when the CCD junction temperature drops by about 25°C, the dark current is reduced by almost an order of magnitude. When the CCD array detector is cooled by TEC from room temperature of 25°C to 10-14°C, the dark current is reduced by 4 times and the dark noise is reduced by 2 times. This proves that the use of TEC cooling (Thermo-Electric Cooler) allows the detector to perform long integration time and weak light detection.

[0004] This puts higher requirements on the miniaturization of lower-temperature refrigeration. As the social demand for high-precision spectrometers grows, the conventional Dewar refrigeration method cannot meet the needs of large-scale production and promotion. Moreover, adding a large liquid cooling circulation system during operation brings inconvenience to users and limits the application environment and scope of use.

[0005] When using low-temperature cavity CCD modules, their low-temperature characteristics will condense moisture in the air in the CCD detector cavity and form frost, condensation and fog on the inner and outer surfaces of the window glass plate. This phenomenon greatly changes the surface emissivity of the cavity glass and produces dielectric absorption, causing the effective emissivity of the cavity bottom to be significantly reduced, becoming a major source of uncertainty, obstructing the observation of various types of refrigerated spectrometers, thereby affecting their measurement accuracy.

[0006] At present, there are three general methods for the application of semiconductor thermoelectric cooling of CCD detectors: 1. The Dewar vacuum chamber is adopted. Its vacuum and multi-layer shell structure reduce the internal air convection heat conduction, and the multi-stage TEC refrigeration can reduce the temperature by 50-70℃. However, this requires a high vacuum Dewar sealed chamber and an exhaust structure to achieve this, and also requires a large-size flange and sealing surface structure. The cavity structure is large in size, and the window size is also large. The large window can eliminate the condensation in the center of the lens as much as possible, and the pressure difference will cause the risk of missing individual sealing points, and the reliability of long-term sealing cannot be guaranteed. This makes it impossible to use it on general small-sized spectrometer equipment, and it is mostly used on astronomical observation, high-speed camera, and large high-definition camera equipment.

[0007] 2. Use a nitrogen-filled pressure-resistant cavity, which is generally equipped with a gas purge system to purge and heat the window glass surface. Make it close to room temperature, and the temperature difference will be smaller, which will greatly reduce the condensation phenomenon. However, this requires a larger window size and an air filling device. Some also need to use canned nitrogen or an air compressor to provide dry gas, and the air curtain structure is complex. Although nitrogen is more stable, its molecular distance is large, and its thermal conductivity is better than that of dry air, and its thermal conductivity efficiency is inversely higher than that of air.

[0008] 3. Directly use array CCD with integrated cooling function (such as Hamamatsu s7031-1006S). This type of CCD itself has an integrated TEC unit at the bottom. It only needs to be equipped with a heat sink or a forced cooling heat pump for use. However, its price is very high, which greatly limits the promotion and application scope of high-precision spectrometers.

[0009] Therefore, a miniaturized, simple, reliable, low-cost device or method capable of performing general cooling on the CCD detector is needed to solve the above technical problems. Summary of the invention

[0010] In order to solve the above technical problems, the present invention makes the sealed cavity very small, and adopts a single-stage small-size TEC thermoelectric cooling unit, the hot surface is connected to the rear heat sink fins, and the cold surface is fitted with the bottom surface of the ordinary CCD; the acquisition signal is transmitted to the external circuit board by a long pin row and a syringe combination, and the pin row is reliably sealed with a potting sealant. In this way, the required cavity space is often less than 60mm, and the small amount of gas in the internal annular space is dried by a preset desiccant. The required desiccant is very small, and the dry air will not frost or condense on the inner surface of the window glass plate under any air pressure. In order to prevent the outer surface of the window glass plate from contacting the ambient gas containing moisture and condensing into frost and dew, the present invention adds a heat conductive cover outside the glass plate to transfer the heat of the TEC hot end on the rear radiator to the outside of the glass plate. In addition, it is ensured that the CCD is at a certain distance from the glass plate to create a larger thermal resistance. When the difference between the internal air temperature and the ambient air temperature is within 9 to 10°C, condensation can be completely eliminated, thereby completely eliminating frost and condensation. The present invention is simple and reliable, and the size is completely suitable for installation in general small spectrometers.

[0011] The present invention provides the following technical solution: A compact non-vacuum thermoelectric refrigeration device for a spectrometer CCD, comprising: a window heat-conducting cover, a window glass plate, a CCD pressure plate, a cavity shell, a heat-insulating layer, a CCD detector, a TEC thermoelectric refrigeration sheet, and an air-cooled fin seat, which are arranged in sequence along the incident direction of the spectrum, wherein the window heat-conducting cover and the air-cooled fin seat are respectively made of heat-conducting materials, and the CCD pressure plate, the cavity shell, and the heat-insulating layer are respectively made of heat-insulating materials; The cavity shell is in the shape of a cylinder with openings at the front and rear, the rear cylinder opening of the cavity shell is sealed and connected to the air-cooling fin seat, the front cylinder opening of the cavity shell is detachably connected to the window heat-conducting cover, and the window heat-conducting cover is heat-conductingly connected to the air-cooling fin seat; The window glass plate is arranged in the tube of the cavity shell, the window glass plate blocks the spectral incident channel, and the window glass plate seals and isolates the side of the cavity shell tube facing the rear tube opening into an independent closed cavity; the CCD pressing plate is pressed against the side of the window glass plate located in the closed cavity, and the side of the CCD pressing plate away from the window glass plate is pressed against the detection surface of the CCD detector; the cooling surface of the TEC thermoelectric cooling sheet is attached to the CCD detector, and the heat dissipation surface of the TEC thermoelectric cooling sheet is thermally connected to the air-cooled fin seat; the inner wall of the heat insulation layer is wrapped outside the closed cavity, and the outer wall of the heat insulation layer is attached to the inner cavity wall of the cavity shell; A desiccant module is provided in the enclosed cavity, and the desiccant module can eliminate a small amount of water vapor in the enclosed space where the CCD detector cavity is located. Since the enclosed space is small, the dryness of the enclosed space is ensured, and the formation of frost, condensation and fog on the inner surface of the window glass plate can be effectively prevented; A CCD plug-in board is arranged in the closed cavity, and a plug-in syringe is arranged on the CCD plug-in board; the pins of the CCD detector are electrically connected to the plug-in syringe, and the CCD plug-in board is electrically connected to the adapter circuit board through a pin row.

[0012] Preferably, the desiccant module comprises: a left desiccant module and a right desiccant module, and the left desiccant module and the right desiccant module are respectively arranged on the left and right sides of the enclosed cavity.

[0013] Preferably, the CCD plug-in board and the adapter circuit board are both C-shaped circuit boards with an opening on one side, and the C-shaped openings of the CCD plug-in board and the adapter circuit board are located on the same side.

[0014] Preferably, a sealing gasket made of a heat insulating material is provided between the cavity shell and the air-cooling fin seat.

[0015] More preferably, the sealing gasket is annular, and grooves are respectively provided on the inner bottom surface of the air-cooled fin seat and the inner tube end surface of the cavity shell, and the sealing gasket matches the grooves; the inner bottom surface of the air-cooled fin seat and the inner tube end surface of the cavity shell clamp the sealing gasket inside.

[0016] Preferably, the joint between the window glass plate and the inner wall of the cavity shell is filled with sealant.

[0017] Preferably, the window thermal cover is detachably connected to the air-cooled fin seat by bolts, and the bolts pass through the through holes on the cavity shell, and the window thermal cover and the air-cooled fin seat clamp the cavity shell in place from both sides; by tightening the window thermal cover and the air-cooled fin seat with bolts, it is ensured that the heat on the air-cooled fin seat can be promptly transferred to the window thermal cover so as to promptly eliminate condensation and frost on the outside of the window glass plate, while ensuring the connection stability of the window thermal cover to the air-cooled fin seat, thereby ensuring the sealing of the enclosed space where the CCD detector cavity is located.

[0018] Preferably, the heat dissipation fins of the air-cooled fin seat are surrounded by the air-cooled fin seat shell, and the heat dissipation channel direction of the heat dissipation fins is parallel to the spectral incident direction; the heat dissipation fins are parallel to the fan airflow direction, which facilitates heat dissipation while allowing the heat on the air-cooled fin seat to be promptly conducted to the window heat conductive cover.

[0019] The beneficial effects of the present invention are: 1. The present invention sets the enclosed space where the CCD detector cavity is located to be smaller, and adopts a small-sized TEC thermoelectric cooling unit in the small space to cool the enclosed space and transfer the heat to the external air-cooled fin seat, thereby ensuring a low-temperature environment in the enclosed space. Therefore, the present invention can improve the measurement accuracy of the refrigeration type spectrometer.

[0020] 2. The present invention connects the window heat conductive cover to the air-cooled fin seat by thermal conductivity, so that the heat of the air-cooled fin seat is transferred to the outside of the window glass plate, so that no condensation occurs on the outside of the window glass plate, thereby completely eliminating frost and condensation. Therefore, the present invention can improve the measurement accuracy of the refrigerated spectrometer.

[0021] 3. The present invention sets a desiccant in the enclosed space. Since the enclosed space is small, very little desiccant is required, so no frost or condensation will occur on the inner side of the window glass plate. Therefore, the present invention can improve the measurement accuracy of the refrigerated spectrometer.

[0022] 4. The signal transmission inside and outside the module of the present invention is to connect the pin holder or syringe on the CCD adapter board with the signal acquisition board outside the refrigeration module in a closed space, and inject sealant into the sealing groove between the pin hole through the wall and the pin. This sealing method eliminates the sealing joint and the wiring, saves the electrical connection space to the greatest extent, and is simple and easy to use and suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a compact non-vacuum thermoelectric refrigeration device for a spectrometer CCD of the present invention; Figure 2 It is a schematic diagram of the installation position structure of the present invention; Figure 3 It is a three-dimensional schematic diagram of the overall structure of the refrigeration module of the present invention; Figure 4 It is a schematic diagram of the explosion and decomposition of the overall structure of the refrigeration module of the present invention; Figure 5 is a longitudinal cross-sectional view of the refrigeration module structure of the present invention; Figure 6 is a cross-sectional view of the refrigeration module structure of the present invention; Figure 7 It is a schematic diagram of the outer structure of the CCD plug board of the present invention; Figure 8 It is a schematic diagram of the inner structure of the CCD plug board of the present invention; Fig. 9 It is a schematic diagram of the inner structure of the adapter circuit board of the present invention; Fig.10 It is a schematic diagram of the outer structure of the adapter circuit board of the present invention; Fig.11 Schematic diagram of monitoring accuracy before refrigeration in an embodiment of the present invention; Fig.12 Schematic diagram of monitoring accuracy after refrigeration in an embodiment of the present invention.

[0024] In the figure, 1. refrigeration device; 2. cooling fan; 3. spectrometer housing; 4. spectrometer bottom plate; 101. window heat conductive cover; 102. CCD pressure plate; 103. desiccant sheet; 104. window glass plate; 105. cavity housing; 106. thermal insulation layer; 107. CCD detector; 108. TEC thermoelectric cooling sheet; 109. CCD plug-in board; 110. left desiccant module; 111. right desiccant module; 112. pin header; 113. sealing pad; 114. adapter circuit board; 115. air-cooled fin seat; 116. sealant; 301. connector pin barrel. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the relevant technologies in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figures 1 to 12As shown, this embodiment provides a small, simple, reliable, low-cost technical means capable of cooling the CCD detector. This embodiment makes it possible to promote and apply high-precision spectrometers on a large scale in various scientific research fields and detection fields.

[0027] Figure 1 , 2 The appearance and structure of the small high-precision spectrometer are shown in the figure. The entire refrigeration device 1 is installed on the spectrometer housing 3 and is aligned with the spectral emission port of the spectrometer. A cooling fan 2 is fixed on the spectrometer housing 3, and the cooling fan 2 is aligned with the cooling fin seat 115 of the refrigeration device 1 for forced convection cooling.

[0028] like Figure 3 , 4 As shown, the refrigeration device 1 includes a window heat-conducting cover 101, a CCD pressing plate 102, a drying sheet 103, a window glass plate 104, a cavity shell 105, an insulation layer 106, a CCD detector 107, a TEC thermoelectric cooling sheet 108, a CCD plug-in board 109, a left desiccant module 110, a right desiccant module 111, a pin row 112, a sealing gasket 113, a transfer circuit board 114, an air-cooled fin seat 115 and a sealant 116, and a plug-in pin barrel 301; the window heat-conducting cover 101, the CCD pressing plate 102, the window glass plate 104, the cavity shell 105, the insulation layer 106, the CCD detector 107, the TEC thermoelectric cooling sheet 108, the CCD plug-in board 109, the left desiccant module 110, the right desiccant module 111, the pin row 112, the sealing gasket 113, the transfer circuit board 114, the air-cooled fin seat 115 and the sealant 116, and the ... The glass plate 104, the cavity shell 105, the heat insulation layer 106, the CCD detector 107, the TEC thermoelectric cooling sheet 108, and the air-cooling fin seat 115 constitute a refrigeration cavity unit, the internal desiccant sheet 103 and the left desiccant module 110 and the right desiccant module 111 constitute a water absorption unit, and the CCD plug-in board 109, the pin row 112, the sealing potting glue 116, and the adapter circuit board 114 constitute a circuit transmission unit; the whole is arranged in the external spectrometer housing 3 and can be installed with a fan 2 to force convection heat dissipation of the air-cooling fins 115 to ensure that the heat generating end of the TEC refrigerator can dissipate heat efficiently. For the description of each part and component, see Table 1.

[0029] like Figure 5 , Figure 6 As shown, the unique and different features of the refrigeration device 1 are mainly: Anti-window condensation method: internally, a drying sheet 103 (calcium chloride) and a left desiccant module 110 and a right desiccant module 111 (water-absorbing silica gel powder bag) are used to fully absorb water in a small space to the greatest extent; externally, a cover is made of a ceramic material or a copper-aluminum material with high thermal conductivity, and a window is opened to transfer heat from the air-cooling fin seat 115 to the outer surface of the window glass plate 104, which is heated to offset to a certain extent the heat absorbed by the CCD from the internal cooling. At the same time, the cavity shell 105 is made of engineering plastics with low thermal conductivity so that the internal cooling force is not affected by the outside, thereby balancing the temperature difference between the inner and outer surfaces of the window glass plate 104.

[0030] Sealing method of small modules: For the sealing between the window glass plate 104 and the cavity shell 105, an annular groove is opened on the sealing surface of the cavity shell 105, and a sealant (including but not limited to epoxy glue, single-component or multi-component silicone) is poured into it. For the sealing between the cavity shell 105 and the air-cooled fin seat 115, a sealing gasket 113 is installed in the plane of the groove on the bottom surface of the air-cooled fin seat 115, and the annular convex rib in the cavity shell 105 is used to compress and seal. For the sealing of the wire header pin 112 at the bottom of the air-cooled fin seat 115, a shallow groove hole is opened at the bottom of the air-cooled fin seat 115, and the corresponding pin hole is drilled at the bottom of the groove. After the pin is installed, it is sealed with a pouring sealant (including but not limited to epoxy glue, single-component or multi-component silicone). These sealing methods are all sealed, occupy a very small size and are reliable for a long time.

[0031] For the plug-in method of circuit connection: Figures 7 to 10 The CCD plug board 109 is connected to the adapter circuit board 114 through the double-headed long pin row 112, and the CCD electrical signal is reliably transmitted from the cavity; the double-headed long pin row 112 is arranged in the sealed cavity formed by the cavity shell 105 and the air-cooled fin seat 115; the plug-in unit on each board is composed of a plurality of plug-in pin barrels 301 arrays, the C-shaped opening on the CCD plug board 109 is used to assemble and surround the CCD boss, and the C-shaped opening on the adapter circuit board 114 is used to assemble and surround the neck groove in the middle of the air-cooled fin seat 115; after the double-headed long pin row 112 is glued and fixed, it becomes very convenient to install the pins of CCD 107 and align the plug-in pin barrel 301 array seat of the adapter circuit board 114 in production. Table 1 shows the components and related descriptions of this embodiment.

[0032] Table 1 Serial number name Material Location Functional Description 101 Window thermal shield ALN aluminum nitride ceramics alumina ceramics or copper oxygen-free copper Installed at the front end, well fits the cavity shell and presses on the window glass plate A window for incident light is opened, and the high thermal conductivity of the material is used to obtain a certain amount of heat from the air-cooled fin seat to heat the outer surface of the window glass plate to reduce the temperature difference and eliminate frost and condensation on the outer surface. 102 CCD Platen ABS PEEK PEI or other low thermal conductivity plastics Installed in the cavity shell, pressed on the upper surface of the CCD detector A window for injecting spectrum is opened and fixed on the air-cooled fin seat with screws to provide a certain pressing force for CCD to ensure that the cold surface of TEC fits well with the bottom surface of CCD, which is the guarantee of cooling. 103 Drying Sheet Calcium chloride Set in the space inside the CCD upper cavity shell Make full use of the space to absorb the moisture that may enter the cavity, ensuring that no frost or condensation occurs on the inner surface 104 Window glass Optical Glass Installed in the front groove of the cavity shell Ensure internal airtightness and transmit the incident spectrum 105 Cavity housing ABS PEEK PEI or other low thermal conductivity plastics Installed in front of the air cooling fin seat, with the rear opening close to the sealing gasket groove Together with the inner bottom surface of the air-cooled fin seat, a sealed chamber is formed, which can be filled with argon gas or dry clean air to ensure that water vapor does not enter the CCD working environment 106 Insulation XPS EPS PUF MLI and other insulation boards Installed in the cavity shell, set between the CCD pressure plate and the CCD plug-in board, surrounding the CCD and located above the desiccant module Used to isolate the heat conduction caused by air convection between the hot and cold surfaces of the TEC semiconductor cooling plate, and prevent the CCD cooling from being affected by thermal disturbances from the hot surface 107 CCD Detector Commercially available general-purpose CCD linear array or area array detector (in this case, Hamamatsu linear array) Installed in the cavity shell, fixed in the groove of the air-cooled fin seat, the lower part fits the cold surface of the TEC sheet, and the pins are inserted into the syringe of the CCD plug-in board The spectral signal received from the spectrometer optical path mirror group is received through the window glass plate, and transmitted to the adapter circuit board through the CCD plug-in board to complete the collection of the spectral signal 108 TEC Thermoelectric Cooling Chip Commercially available single-layer TEC unit Installed in the cavity shell, fixed in the groove of the air-cooled fin seat, with the upper part attached to the bottom surface of the CCD detector The CCD detector is supported and fixed, the bottom is cooled, and the heat from the hot surface is transferred to the air-cooled fin holder to suppress the CCD dark current and thermal noise, thereby obtaining a high-quality spectral signal with a high signal-to-noise ratio. 109 CCD plug-in board PCB circuit board The pins are inserted into the syringe of the CCD plug-in board and connected to the external adapter circuit board through the pin header. Receive the electrical signals of each pin of the CCD detector through the needle and pin header on it 110 Left desiccant module Silica gel particles Installed at the bottom of the cavity shell, with the upper part being the heat insulation layer Make full use of the space to absorb the moisture that may enter the cavity, ensuring that no frost or condensation occurs on the inner surface 111 Right desiccant module Silica gel particles Installed at the bottom of the cavity shell, with the upper part being the heat insulation layer Make full use of the space to absorb the moisture that may enter the cavity, ensuring that no frost or condensation occurs on the inner surface 112 Pin Header Commercially available double-ended pin header Pass through the holes on the bottom of the air-cooled fin holder to connect the CCD plug-in board and the adapter circuit board The electrical signal of the CCD detector is transmitted between the CCD plug-in board and the adapter circuit board through the needle and pin row on it. 113 Gasket Silicone Rubber Installed in the groove on the bottom of the air-cooled fin seat, with an annular convex rib inside the cavity shell pressed on its upper part Using the inner plane of the groove on the bottom of the air-cooled fin seat and the annular ribs in the cavity shell 114 Adapter circuit board PCD circuit board It is fixed in the bottleneck groove outside the air-cooling fin seat in a C shape and connected to the CCD plug-in board through a pin header. The needle barrel and the pin header receive the electrical signal on the CCD plug-in board inside the cavity. 115 Air cooling fin seat Aluminum Alloy Bolt holes are provided to fasten the adapter circuit board, cavity shell and window heat conductive cover together It is equivalent to a heat sink, which dissipates the heat generated by TEC and CCD on the fin surface into the air through fans or natural convection. The internal mounting boss wraps and supports the TEC unit. 116 Sealant Epoxy potting glue or silicone Filled in the annular groove at the window of the cavity shell, set on the sealing surface between the window glass plate and the cavity shell Ensures permanent sealing between the inner surface of the window glass and the cavity shell Example

[0033] In this embodiment, a compact non-vacuum thermoelectric refrigeration device for a spectrometer CCD is applied to a power transformer. After installing the device, a specially designed drive power board is used to cool a large power transformer in a large transmission and substation. The power is turned on and the refrigeration starts automatically. The target temperature is 1°C. After algorithm optimization, the temperature control drift is stabilized at ±0.1°C, which fully achieves the temperature control target. Under the 15s integration time, the temperature control has a significant inhibitory effect on the noise fluctuation of the spectrometer, which fully meets the equipment detection accuracy standard requirements proposed by the enterprise.

[0034] In summary, the present invention sets the enclosed space where the CCD detector cavity is located to be smaller, and adopts a small-sized TEC thermoelectric cooling unit in the small space to cool the enclosed space and transfer the heat to the external air-cooled fin seat, thereby ensuring a low-temperature environment in the enclosed space. Therefore, the present invention can improve the measurement accuracy of the refrigeration type spectrometer.

[0035] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A compact non-vacuum thermoelectric cooling device for a spectrometer CCD, characterized in that: include: The following are arranged in sequence along the spectral incident direction: a window heat-conducting cover (101), a window glass plate (104), a CCD pressing plate (102), a cavity shell (105), a heat-insulating layer (106), a CCD detector (107), a TEC thermoelectric cooling sheet (108), and an air-cooling fin seat (115); the window heat-conducting cover (101) and the air-cooling fin seat (115) are respectively made of heat-conducting materials, and the CCD pressing plate (102), the cavity shell (105), and the heat-insulating layer (106) are respectively made of heat-insulating materials; The cavity shell (105) is in the shape of a cylinder with openings at the front and rear, the rear cylinder opening of the cavity shell (105) is sealed and connected to the air-cooling fin seat (115), the front cylinder opening of the cavity shell (105) is detachably connected to the window heat-conducting cover (101), and the window heat-conducting cover (101) is heat-conductingly connected to the air-cooling fin seat (115); The window glass plate (104) is arranged in the tube of the cavity shell (105), the window glass plate (104) blocks the spectral incident channel, and the window glass plate (104) seals and isolates the side of the cavity shell (105) tube facing the rear tube opening to form an independent closed cavity; the CCD pressing plate (102) is pressed against the side of the window glass plate (104) located in the closed cavity, and the side of the CCD pressing plate (102) away from the window glass plate (104) is pressed against the detection surface of the CCD detector (107); the cooling surface of the TEC thermoelectric cooling sheet (108) is in contact with the CCD detector (107), and the heat dissipation surface of the TEC thermoelectric cooling sheet (108) is thermally connected to the air-cooled fin seat (115); the inner wall of the heat insulation layer (106) is wrapped outside the closed cavity, and the outer wall of the heat insulation layer (106) is in contact with the inner cavity wall of the cavity shell (105); A desiccant module is provided in the enclosed cavity; A CCD plug-in board (109) is provided in the sealed cavity, and a plug-in syringe (301) is provided on the CCD plug-in board (109); the pins of the CCD detector (107) are electrically connected to the plug-in syringe (301), and the CCD plug-in board (109) is electrically connected to the adapter circuit board (114) via a pin header (112).

2. A compact non-vacuum thermoelectric cooling device for a spectrometer CCD according to claim 1, characterized in that: The desiccant module comprises: a left desiccant module (110) and a right desiccant module (111); the left desiccant module (110) and the right desiccant module (111) are arranged on the left and right sides of the closed cavity, respectively.

3. A compact non-vacuum thermoelectric cooling device for a spectrometer CCD according to claim 1, characterized in that: The CCD plug-in board (109) and the adapter circuit board (114) are both C-shaped circuit boards with an opening on one side, and the C-shaped openings of the CCD plug-in board (109) and the adapter circuit board (114) are located on the same side.

4. A compact non-vacuum thermoelectric cooling device for a spectrometer CCD according to claim 1, characterized in that: A sealing gasket (113) made of a heat insulating material is provided between the cavity shell (105) and the air-cooling fin seat (115).

5. A compact non-vacuum thermoelectric cooling device for a spectrometer CCD according to claim 4, characterized in that: The sealing gasket (113) is annular, and grooves are respectively provided on the inner bottom surface of the air-cooling fin seat (115) and the inner tube end surface of the cavity shell (105), and the sealing gasket (113) matches the grooves; the inner bottom surface of the air-cooling fin seat (115) and the inner tube end surface of the cavity shell (105) clamp the sealing gasket (113) therein.

6. A compact non-vacuum thermoelectric cooling device for a spectrometer CCD according to claim 1, characterized in that: The joint between the window glass plate (104) and the inner wall of the cavity shell (105) is filled with sealant (116).

7. A compact non-vacuum thermoelectric cooling device for a spectrometer CCD according to claim 1, characterized in that: The window heat conductive cover (101) is detachably connected to the air cooling fin seat (115) via bolts, and the bolts pass through through holes on the cavity shell (105). The window heat conductive cover (101) and the air cooling fin seat (115) clamp the cavity shell (105) in place from both sides.

8. The compact non-vacuum thermoelectric cooling device for a spectrometer CCD according to claim 1, characterized in that: The heat dissipation fins of the air-cooling fin seat (115) surround the periphery of the air-cooling fin seat (115) shell, and the heat dissipation channel direction of the heat dissipation fins is parallel to the spectral incident direction and the airflow direction of the fan.

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