A Compact Non-Vacuum Thermoelectric Refrigeration Device for the CCD of a Spectrometer

Abstract

The present invention belongs to the technical field of refrigerated spectrometers, and relates to a compact non-vacuum thermoelectric refrigeration device for the CCD of a spectrometer, comprising: a window heat conduction cover, a window glass plate, a CCD pressing plate, a cavity housing, a heat insulation layer, a CCD detector, a TEC thermoelectric refrigeration chip, and an air-cooled fin seat, which are sequentially arranged along the spectral incident direction. The window glass plate is arranged inside the cylinder of the cavity housing, the window glass plate blocks the spectral incident channel, and the window glass plate seals and isolates the inner side of the cavity housing cylinder facing the rear cylinder opening into an independent sealed cavity. The refrigerating surface of the TEC thermoelectric refrigeration chip is attached to the CCD detector; by setting the sealed space where the CCD detector cavity is located to be relatively small, and using a small-size TEC thermoelectric refrigeration unit in the small space to cool the sealed space and conduct the heat to the external air-cooled fin seat, the present invention ensures a low-temperature environment in the sealed space, and therefore the present invention can improve the measurement accuracy of the refrigerated spectrometer.

Description

Technical Field

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

[0002] With the development of the optoelectronic detection instrument industry in China, the importance of the performance of various spectrometers is increasing day by day. With the development of high-precision CCD (Charge-Coupled Device) detectors, cooling the CCD array detector is an effective means to reduce dark noise, and at the same time, it can increase the dynamic range of the detector and improve the detection limit.

[0003] Through actual observation, 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 almost reduced by an order of magnitude. When the CCD array detector is cooled from the room temperature of 25 °C to 10 - 14 °C by a TEC, the dark current is reduced by 4 times and the dark noise is reduced by 2 times. This proves that using TEC refrigeration (Thermo-Electric Cooler) enables the detector to perform long integration time and weak light detection.

[0004] This poses higher requirements for lower temperature refrigeration miniaturization. Moreover, as the social demand for high-precision spectrometers is increasing, the conventional Dewar refrigeration method cannot meet the requirements of large-scale production and popularization. In addition, adding a large liquid cooling circulation system during operation brings inconvenience to users and causes restrictions on the application environment and scope of use.

[0005] In the use of a low-temperature chamber CCD module, its low-temperature characteristics will condense the moisture in the air in the CCD detector cavity and form frosting, dew 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 generates a dielectric absorption phenomenon, resulting in a significant reduction in the effective emissivity at the bottom of the cavity, becoming a major source of uncertainty, blocking the observation of various refrigerated spectrometers, and thus affecting the measurement accuracy.

[0006] Currently, there are generally three ways to apply semiconductor thermoelectric refrigeration to CCD detectors:

[0007] 1. A Dewar - type vacuum cavity is adopted. Its vacuum and multi - layer shell structure reduce the internal air convection heat conduction. Multi - stage TEC refrigeration can lower the temperature by 50 - 70 °C, but this requires a high - vacuum Dewar sealed cavity and a pumping structure to achieve. It also requires large - size flanges and sealing surface structures. Its cavity structure size is large, and the window size is also large. By using a large window, the condensation at the center of the lens can be eliminated as much as possible. However, there will be potential risks of leakage at individual sealing points under pressure difference, and the long - term sealing reliability cannot be guaranteed. This results in its inability to be used in general small - size spectrometer - type devices and is mostly used in equipment such as astronomical observations, high - speed photography, and large - scale high - definition cameras.

[0008] 2. A pressure - resistant cavity filled with nitrogen is adopted. It is generally equipped with a gas purging system, which can purge and heat the surface of the window glass, making it close to room temperature. When the temperature difference becomes smaller, the condensation phenomenon is greatly reduced. However, this requires a larger window size and the installation of an inflation device. Some also need canned nitrogen or an air compressor to provide dry gas, and the air curtain structure is complex. At the same time, although nitrogen is more stable, its molecular spacing is large, and its thermal conductivity is better than that of dry air, and its heat conduction efficiency is higher than that of air.

[0009] 3. An array CCD with an integrated refrigeration function (such as Hamamatsu s7031 - 1006S) is directly adopted. Such a CCD integrates a TEC unit at the bottom inside itself and only needs to be equipped with a heat sink or a forced - cooling heat pump to be used. However, its price is very high, which greatly limits the popularization and application scope of high - precision spectrometers.

[0010] Therefore, a miniaturized, simple and reliable, low - cost device or method that can generally cool a CCD detector is needed to solve the above - mentioned technical problems. Summary of the Invention

[0011] To solve the above - mentioned technical problems, the present invention makes the sealed cavity very small and adopts a single - stage small - size TEC thermoelectric refrigeration unit. The hot surface is connected to the rear heat dissipation fins, and the cold surface is attached to the bottom surface of an ordinary CCD. The signal acquisition uses a combination of long row - pins and a syringe to transmit to an external circuit board, and the row - pins are reliably sealed with potting sealant. In this way, the required cavity space is often less than 60 mm. A small amount of annular air inside is dried by pre - placed desiccants, and very little desiccant is needed. Moreover, dry air will not frost or dew on the inner surface of the window glass plate under any air pressure. To prevent the outer surface of the window glass plate from contacting the moisture - containing ambient gas and condensing into frost or dew, the present invention adds a heat conduction cover outside the glass plate to conduct the heat at the TEC hot end on the rear radiator to the outside of the glass plate. In addition, a certain distance is ensured between the CCD and the glass plate to create a large thermal resistance. When the temperature difference between the internal air temperature and the ambient air temperature is within 9 - 10 °C, no condensation phenomenon will occur at all, thus completely eliminating frost and dew. Moreover, the present invention is simple and reliable, and its size is completely suitable for the installation of general small - size spectrometers.

[0012] The present invention provides the following technical solution: a compact non-vacuum thermoelectric cooling device for a CCD of a spectrometer, comprising: a window heat conductive cover, a window glass plate, a CCD pressure plate, a cavity shell, a thermal insulation layer, a CCD detector, a TEC thermoelectric cooling sheet, and an air-cooled fin seat, which are arranged in sequence along the spectral incidence direction, wherein the window heat conductive cover and the air-cooled fin seat are respectively made of a heat conductive material, and the CCD pressure plate, the cavity shell, and the thermal insulation layer are respectively made of a heat insulating material;

[0013] The cavity shell is in the shape of a cylinder with openings at the front and rear. The rear opening of the cavity shell is sealed and connected to the air-cooling fin seat. The front opening of the cavity shell is detachably connected to the window heat-conducting cover. The window heat-conducting cover is heat-conductingly connected to the air-cooling fin seat.

[0014] A window glass plate is disposed within the tube of the cavity shell, blocking the spectral incident channel and sealing the side of the cavity shell toward the rear tube opening to form an independent, sealed cavity. A CCD pressure plate abuts against the side of the window glass plate located within the sealed cavity, and the side of the CCD pressure plate away from the window glass plate presses against the detection surface of the CCD detector. The cooling surface of the TEC thermoelectric cooler is bonded to the CCD detector, and the heat dissipation surface of the TEC thermoelectric cooler is thermally connected to the air-cooled fin seat by heat conduction. The inner wall of the thermal insulation layer is wrapped around the outside of the sealed cavity, and the outer wall of the thermal insulation layer abuts against the inner wall of the cavity shell.

[0015] A desiccant module is provided in the enclosed cavity. 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;

[0016] A CCD plug-in board is provided in the sealed cavity, and a plug-in pin barrel is provided on the CCD plug-in board; the pins of the CCD detector are electrically connected to the plug-in pin barrel, and the CCD plug-in board is electrically connected to the adapter circuit board through a pin row.

[0017] 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.

[0018] 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.

[0019] Preferably, a sealing gasket made of heat insulating material is provided between the cavity shell and the air-cooling fin seat.

[0020] More preferably, the gasket is annular. Grooves are respectively provided on the inner bottom surface of the air-cooled fin seat and the end surface of the inner cylinder of the cavity housing, and the gasket matches the grooves; the inner bottom surface of the air-cooled fin seat and the end surface of the inner cylinder of the cavity housing clamp the gasket inside.

[0021] Preferably, a sealant is filled at the joint between the window glass plate and the inner cylinder wall of the cavity housing.

[0022] Preferably, the window heat conducting cover is detachably connected to the air-cooled fin seat by bolts. The bolts pass through the through holes on the cavity housing. The window heat conducting cover and the air-cooled fin seat clamp and position the cavity housing from both sides; by tightening the bolts to connect the window heat conducting cover and the air-cooled fin seat, it ensures that the heat on the air-cooled fin seat can be conducted to the window heat conducting cover in time to facilitate the timely elimination of the condensation and frosting on the outer side of the window glass plate, and at the same time, it ensures the connection stability from the window heat conducting cover to the air-cooled fin seat, thus ensuring the sealing performance of the closed space where the CCD detector cavity is located.

[0023] Preferably, the heat dissipation fins of the air-cooled fin seat surround the periphery of the air-cooled fin seat housing, 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 air flow direction, which is convenient for heat dissipation and enables the heat on the air-cooled fin seat to be conducted to the window heat conducting cover in time.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. By setting the closed space where the CCD detector cavity is located to be relatively small, and adopting a small-size TEC thermoelectric refrigeration unit in the small space, the closed space is cooled and the heat is conducted to the external air-cooled fin seat, thus ensuring the low-temperature environment in the closed space. Therefore, the present invention can improve the measurement accuracy of the refrigerated spectrometer.

[0026] 2. By thermally connecting the window heat conducting cover and the air-cooled fin seat, the heat of the air-cooled fin seat is conducted to the outer side of the window glass plate, so that no condensation phenomenon occurs on the outer side of the window glass plate, thus completely eliminating the frosting and dew condensation phenomena. Therefore, the present invention can improve the measurement accuracy of the refrigerated spectrometer.

[0027] 3. By arranging a desiccant in the closed space, since the closed space is set to be relatively small, very little desiccant is required, so no frosting and dew condensation phenomena occur on the inner side of the window glass plate. Therefore, the present invention can improve the measurement accuracy of the refrigerated spectrometer.

[0028] 4. For the signal transmission inside and outside the module of the present invention, the signal is transmitted through the pin socket or barrel on the CCD adapter board to plug into the signal acquisition board outside the refrigeration module in a sealed space, and sealant is poured into the sealing notch between the wall-piercing pin header via holes and the pins. This sealing method eliminates the sealing joints and cable assemblies, saves the electrical connection space to the greatest extent, and is simple and easy to implement, suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the overall structural schematic diagram of a compact non-vacuum thermoelectric refrigeration device for a spectrometer CCD according to the present invention;

[0030] Figure 2 is the structural schematic diagram of the installation position according to the present invention;

[0031] Figure 3 is the three-dimensional schematic diagram of the overall structure of the refrigeration module according to the present invention;

[0032] Figure 4 is the exploded schematic diagram of the overall structure of the refrigeration module according to the present invention;

[0033] Figure 5 is the longitudinal sectional view of the structure of the refrigeration module according to the present invention;

[0034] Figure 6 is the transverse sectional view of the structure of the refrigeration module according to the present invention;

[0035] Figure 7 is the schematic diagram of the outer side structure of the CCD adapter board according to the present invention;

[0036] Figure 8 is the schematic diagram of the inner side structure of the CCD adapter board according to the present invention;

[0037] Fig. 9 is the schematic diagram of the inner side structure of the adapter circuit board according to the present invention;

[0038] Fig.10 is the schematic diagram of the outer side structure of the adapter circuit board according to the present invention;

[0039] Fig.11 is the schematic diagram of the monitoring accuracy before refrigeration in the embodiment according to the present invention;

[0040] Fig.12 is the schematic diagram of the monitoring accuracy after refrigeration in the embodiment according to the present invention.

[0041] In the figure, 1. Refrigeration device; 2. Cooling fan; 3. Spectrometer housing; 4. Spectrometer base plate; 101. Window heat conductive cover; 102. CCD pressure plate; 103. Drying sheet; 104. Window glass plate; 105. Cavity housing; 106. 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 gasket; 114. Adapter circuit board; 115. Air-cooled fin holder; 116. Sealant; 301. Connector pin barrel. DETAILED DESCRIPTION

[0042] The following will provide a clear and complete description of the relevant technologies in the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] like Figures 1 to 12 As shown, this embodiment provides a small, simple, reliable, low-cost technical means for cooling the CCD detector. This embodiment makes it possible to promote and apply high-precision spectrometers on a large scale in various scientific research and detection fields.

[0044] Figure 1 、 2 This is the appearance and structure of a small high-precision spectrometer. As shown in the figure, the entire refrigeration device 1 is installed on the spectrometer housing 3 and aligned with the spectrometer spectral emission port. 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 heat dissipation.

[0045] like Figure 3 、 4As shown, the refrigeration device 1 includes a window heat-conducting cover 101, a CCD pressure plate 102, a drying sheet 103, a window glass plate 104, a cavity shell 105, a heat-insulating 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 header 112, a sealing gasket 113, an adapter circuit board 114, an air-cooling fin holder 115 and a sealant 116, and a plug-in pin barrel 301; the window heat-conducting cover 101, the CCD pressure plate 102, the window glass plate 104, the cavity shell 105, the heat-insulating 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 header 112, the sealing gasket 113, the adapter circuit board 114, the air-cooling fin holder 115 and the sealant 116, and the plug-in pin barrel 301; The glass plate 104, cavity housing 105, insulation layer 106, CCD detector 107, TEC thermoelectric cooler 108, and air-cooling fin holder 115 constitute the cooling cavity unit. The internal desiccant fins 103, left desiccant module 110, and right desiccant module 111 form the water absorption unit. The CCD connector board 109, pin header 112, sealing potting compound 116, and adapter circuit board 114 form the circuit transmission unit. The entire unit is housed within the external spectrometer housing 3 and can be equipped with a fan 2 to force convection cooling of the air-cooling fins 115, ensuring efficient heat dissipation at the heat-generating end of the TEC cooler. See Table 1 for a detailed description of the various parts and components.

[0046] like Figure 5 , Figure 6 As shown, the unique and different features of the refrigeration device 1 are mainly:

[0047] Anti-window condensation method: Drying sheet 103 (calcium chloride) and left desiccant module 110 and right desiccant module 111 (water-absorbing silica gel powder bag) are used internally to fully absorb water in a small space to the greatest extent possible; the exterior is made of a cover made of high-thermal-conductivity ceramic material or copper-aluminum material with a window opened, which conducts heat from the air-cooling fin seat 115 to the outer surface of the window glass plate 104, heating it 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 low-thermal-conductivity engineering plastic so that the internal cooling power is not affected by the outside, thereby balancing the temperature difference between the inner and outer surfaces of the window glass plate 104.

[0048] Sealing methods for small modules: For sealing between the window glass plate 104 and the cavity housing 105, an annular groove is created on the sealing surface of the cavity housing 105, and a sealant (including but not limited to epoxy glue, single-component or multi-component silicone) is poured into the groove. For sealing between the cavity housing 105 and the air-cooling fin holder 115, a sealing gasket 113 is installed within the plane of the groove on the bottom surface of the air-cooling fin holder 115, and a circular rib within the cavity housing 105 is used to compress and seal. For sealing the pin headers 112 at the bottom of the air-cooling fin holder 115, a shallow groove is created in the bottom of the air-cooling fin holder 115, and corresponding pin header holes are drilled at the bottom of the groove. After the pin headers are installed, a sealant (including but not limited to epoxy glue, single-component or multi-component silicone) is poured into the groove and sealed. All of these sealing methods are airtight, occupy a very small footprint, and are reliable over the long term.

[0049] For the plug-in method of circuit connection: Figures 7 to 10 The CCD plug-in board 109 is connected to the adapter circuit board 114 via a double-ended long pin row 112, reliably transmitting the CCD electrical signal from the cavity. The double-ended long pin row 112 is disposed within a sealed cavity formed by the cavity housing 105 and the air-cooling fin holder 115. The plug-in units on each board are composed of an array of multiple connector pins 301. The C-shaped opening on the CCD plug-in board 109 is used to fit and surround the CCD boss, and the C-shaped opening on the adapter circuit board 114 is used to fit and surround the neck groove in the middle of the air-cooling fin holder 115. After the double-ended long pin row 112 is glued and fixed, it becomes very convenient to install the pins of the CCD 107 and align the connector pin array 301 on the adapter circuit board 114 during production. Table 1 shows the components and related descriptions of this embodiment.

[0050] Table 1

[0051] 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, it fits well with 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 pressure plate 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 incident 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 sheets Calcium chloride Set in the space inside the CCD upper cavity shell Make full use of the space to absorb 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 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 layer XPS EPS PUFMLI and other insulation boards Installed in the cavity housing, 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 refrigeration plate, and prevent the CCD refrigeration from being affected by the thermal disturbance from the hot surface 107 CCD detector Commercially available general-purpose CCD linear or area array detectors (in this case, Hamamatsu linear array) Installed in the cavity shell, fixed in the groove of the air-cooled fin seat, with the lower part attached to the cold surface of the TEC piece, and the pins 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 cooler 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 fitting the bottom surface of the CCD detector The CCD detector is supported and fixed, and the bottom is cooled. At the same time, the heat of 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 needle barrel 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 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 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 headers Pass through the holes on the bottom of the air-cooling fin seat 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 header on it 113 Gasket Silicone Rubber Installed in the groove on the bottom of the air-cooled fin seat, with an annular rib inside the cavity shell pressed on its upper part Utilize the inner plane of the groove on the bottom surface of the air-cooled fin seat and the annular rib inside 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 the pin header. The needle and pin header receive the electrical signal from the CCD board inside the cavity. 115 Air cooling fin seat Aluminum Alloy It is equipped with bolt holes and fastened to the adapter circuit board, cavity shell and window heat conductive cover. It is equivalent to a heat sink, which dissipates the heat generated by the 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 compound or silicone Filled in the annular groove of the cavity shell window, set on the sealing surface between the window glass plate and the cavity shell Ensures a permanent seal between the inner surface of the window glass and the cavity shell

[0052] Example

[0053] In this example, a compact non-vacuum thermoelectric cooling device for a spectrometer CCD was applied to a power transformer. After installation, the device, using a specially designed driver board, cooled a large transformer at a large power transmission and substation. The device automatically initiated cooling upon power-up, achieving a target temperature of 1°C. After algorithm optimization, the temperature control drift stabilized to within ±0.1°C, fully achieving the target temperature. With a 15s integration time, the temperature control significantly suppressed spectrometer noise fluctuations, fully meeting the company's equipment testing accuracy standards.

[0054] In summary, the present invention sets the enclosed space where the CCD detector cavity is located to be relatively small, and uses a small-sized TEC thermoelectric cooling unit in the small space to cool the enclosed space and conduct 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 refrigerated spectrometer.

[0055] It should be emphasized that the above are only the preferred embodiments of the present invention, and there is no limitation to the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A compact non-vacuum thermoelectric refrigeration device for the CCD of a spectrometer, characterized in that, include: The following components are arranged in sequence along the spectral incident direction: a window heat-conducting cover (101), a window glass plate (104), a CCD pressure plate (102), a cavity shell (105), a heat-insulating layer (106), a CCD detector (107), a TEC thermoelectric cooling plate (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 pressure plate (102), the cavity shell (105), and the heat-insulating layer (106) are respectively made of heat-insulating materials; The cavity shell (105) is cylindrical with front and rear openings, the rear opening of the cavity shell (105) is sealed and connected to the air-cooling fin seat (115), the front 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), and the window glass plate (104) blocks the spectral incident channel. The window glass plate (104) seals and isolates the side of the cavity shell (105) toward the rear tube opening into an independent closed cavity; the CCD pressure plate (102) is abutted against the side of the window glass plate (104) located in the closed cavity, and the side of the CCD pressure 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 plate (108) is abutted against the CCD detector (107), and the heat dissipation surface of the TEC thermoelectric cooling plate (108) is heat-conductingly 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 abutted against the inner cavity wall of the cavity shell (105); A desiccant module is provided in the sealed cavity; A CCD plug-in board (109) is provided in the sealed cavity, and a plug-in pin barrel (301) is provided on the CCD plug-in board (109); the pins of the CCD detector (107) are electrically connected to the plug-in pin barrel (301), and the CCD plug-in board (109) is electrically connected to the adapter circuit board (114) via a pin row (112); A sealing gasket (113) made of a heat-insulating material is provided between the cavity housing (105) and the air-cooling fin seat (115); 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.

2. The compact non-vacuum thermoelectric refrigeration device for the 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 respectively arranged on the left and right sides of the closed cavity.

3. A compact non-vacuum thermoelectric refrigeration 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 a single-sided opening, and the C-shaped openings of the CCD plug-in board (109) and the adapter circuit board (114) are on the same side.

4. A compact non-vacuum thermoelectric refrigeration device for a spectrometer CCD according to claim 1, characterized in that, A sealant (116) is filled at the joint between the window glass plate (104) and the inner cylindrical wall of the cavity housing (105).

5. A compact non-vacuum thermoelectric refrigeration device for a spectrometer CCD according to claim 1, characterized in that, The window heat conduction cover (101) is detachably connected to the air-cooled fin seat (115) by bolts. The bolts pass through the through holes on the cavity housing (105), and the window heat conduction cover (101) and the air-cooled fin seat (115) clamp and position the cavity housing (105) from both sides.

6. A compact non-vacuum thermoelectric refrigeration device for a spectrometer CCD according to claim 1, characterized in that, The heat dissipation fins of the air-cooled fin seat (115) surround the periphery of the housing of the air-cooled fin seat (115), and the heat dissipation channel direction of the heat dissipation fins is parallel to the spectral incident direction and the air flow direction of the fan.

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