Recyclable gas drying device for wide-spectrum terahertz time-domain spectroscopy system

Abstract

The utility model discloses a recyclable gas drying device for a wide-spectrum terahertz time-domain spectroscopy system, which comprises a device shell for accommodating a conveying module and a drying module and a system shell for accommodating a terahertz optical device, and the device shell and the system shell are communicated through a ventilation pipe to form a gas circulation loop; the device shell comprises an uncovered shell, cover plates, a partition plate, an air inlet, an air outlet and a power port, the partition plate divides the interior of the uncovered shell into a left space and a right space, and the left cover plate and the right cover plate are not fixedly arranged at the top ends of the two spaces respectively to form a closed space. The drying module comprises an acrylic plate, air filter paper, a silica gel drying agent and a net bag, wherein air holes are evenly distributed in the acrylic plate. Air in the system shell is pushed by the conveying module to flow through the drying module through the ventilation pipe and flows back into the system shell after being filtered and dried, and the functions of filtering and drying the air are achieved through multiple times of circulation. The device has the advantages of being simple in structure, capable of being recycled, low in material consumption and high in integration level.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas drying technical field especially a kind of recyclable gas drying device for wide spectrum terahertz time-domain spectroscopy system. BACKGROUND

[0002] Terahertz time-domain spectroscopy technology has been widely applied in various fields, with advantages such as non-destructive testing and simultaneous acquisition of amplitude and phase information, and is gradually becoming an important tool in scientific research and practical application. The development of terahertz time-domain spectroscopy technology cannot be separated from efficient and stable terahertz sources. DAST crystals are excellent wide spectrum terahertz source materials due to their excellent nonlinear optical properties. In order to grow DAST crystals with high crystallinity, few defects and large size, relevant personnel have conducted a lot of research and formed many crystal growth methods. The grown DAST crystals can be characterized and analyzed by wide spectrum terahertz time-domain spectroscopy system. When the terahertz signal generated by the DAST crystal propagates in the system through the air, the moisture in the air will cause great loss to the terahertz signal, reducing the accuracy of the measurement. The crystal for detecting the terahertz signal is an organic crystal, which is easy to deliquesce. After the water vapor in the air combines with the crystal, the crystal structure will change, seriously reducing the detection performance. Therefore, it is necessary to reduce the water vapor in the air of the system, which is very important for the stable operation of the wide spectrum terahertz system. Chinese patent CN110160650A discloses a terahertz spectrometer drying device, which realizes the function of automatic air drying of the terahertz spectrometer detection chamber through a drying air generation module with feedback. CN210198955U discloses a terahertz time-domain spectroscopy measurement system, which realizes vacuumization of the sample cavity through an integrated vacuum system, and sets the generation and detection of terahertz light in the sample cavity that can be vacuumized, which can eliminate the interference of water vapor during terahertz time-domain frequency spectrum measurement, thereby avoiding the complex and undesirable background correction method in the subsequent spectrum processing process.

[0003] The existing technical solutions have the following two kinds: one is to configure a vacuumizing device for the terahertz time-domain spectroscopy system to extract the air in the terahertz time-domain spectroscopy system. The disadvantage of this device is that when different angles of the measurement crystal need to be characterized, the sealed box needs to be opened to manually rotate the crystal, and after rotation, the air needs to be extracted again, which is a complicated process. The second is to configure a nitrogen cylinder for the terahertz time-domain spectroscopy system to fill dry nitrogen into the terahertz time-domain spectroscopy system, and nitrogen circulation is needed to ensure the purity of the gas. The disadvantage of this device is that the addition of nitrogen storage equipment increases the volume of the entire device, and nitrogen is a consumable that needs to be replaced regularly, which is high in cost. UTILITY MODEL CONTENT

[0004] In order to solve the problems of complicated operation process, heavy drying equipment, high cost and moisture dissolution of detection crystal of the existing wide spectrum terahertz time domain spectroscopy system drying device, the utility model provides a kind of gas drying device, which can be recycled, small in size, easy to manufacture and easy to use, the fan in the gas drying device promotes the circulation of gas in the system shell, and the silica gel drying agent absorbs the water vapor in the gas, achieving the effect of drying the gas, creating a dry environment in the wide spectrum terahertz time domain spectroscopy system, slowing down the moisture dissolution of the detection crystal, and the silica gel drying agent can be recycled, reducing the cost of consumables, and the device is small in size and high in integration.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme to solve its technical problems: a kind of gas drying device for wide spectrum terahertz time domain spectroscopy system, including conveying module, drying module, device shell and system shell;The device shell is used to accommodate the conveying module and the drying module, and the system shell is used to accommodate the terahertz optical device, and the device shell and the system shell are connected by a ventilation pipe to form a gas circulation loop;The conveying module is used to promote the flow of gas in the circulation loop;The drying module is used to dry and purify the gas in the system shell;

[0006] The device shell includes a coverless shell, a cover plate, a partition, an air inlet, an air outlet and a power supply port;The partition divides the inside of the coverless shell into two spaces on the left and right sides, and is used to accommodate the conveying module and the drying module, and the partition has a hole in the middle to connect the conveying module and the drying module;The air inlet is located on the side of the coverless shell that accommodates the conveying module, the air outlet is located on the side of the coverless shell that accommodates the drying module, and the power supply port is located at the front end of the coverless shell that accommodates the conveying module;The top of the two spaces on the left and right sides of the inside of the coverless shell is non-fixedly provided with left and right cover plates to form a closed space;The cover plate is an acrylic plate with a handle;An acrylic strip is provided below the cover plate, which is used to prevent the cover plate from sliding and prevent the coverless shell from deforming;The air outlet is connected to the ventilation pipe through a conversion joint, so that the dried and purified gas flows back into the system shell;

[0007] Preferably, the device shell is a rectangular parallelepiped, and the coverless shell and the cover plate form a closed space to prevent air dust from entering the inside of the device shell;Preferably, when the fan has the maximum wind speed, no gas flows out of the cover plate in the space that accommodates the drying module;Preferably, the conveying module is placed in the left space inside the device shell, and the drying module is placed in the right space inside the device shell;

[0008] The conveying module comprises a fan, a fan speed regulator, a variable diameter joint and a clamp; the fan speed regulator is fixed on the power supply port and is used to control the air suction speed of the fan, so that the gas entering the drying module is fully dried; the fan air inlet penetrates the air inlet of the device shell with the same hole diameter, and is sequentially connected with the ventilation pipe in a sealed manner through the variable diameter joint and the clamp; the clamp is used to fix the sealing ventilation pipe and the connection part of the variable diameter joint; the fan air outlet is connected with the hole in the middle of the baffle;

[0009] The drying module comprises two evenly distributed air hole acrylic plates, air filter paper, silica gel desiccant and a mesh bag; the two evenly distributed air hole acrylic plates are placed in parallel with the baffle, and the four edges are fixed in a sealed and fitted manner with the coverless shell, and the inner sides are respectively completely covered with an air filter paper for filtering and purifying the gas; the middle area is filled with silica gel desiccant packed in a mesh bag, and the mesh bag is used to facilitate the removal of the silica gel desiccant;

[0010] Preferably, a silica gel sealing ring is arranged between the fan air outlet and the hole in the middle of the baffle in the space containing the drying module to seal the gap and prevent external air from flowing into the gap; preferably, the inner diameter of the silica gel sealing ring is the same as the diameter of the fan air outlet; the coverless shell containing the drying module space is provided with a silica gel pad around the top edge, and the silica gel sealing ring and the silica gel pad are used to enhance the sealing performance of the drying module and prevent external air from flowing into the device during operation; preferably, the acrylic square strip arranged below the cover plate at the top of the space containing the drying module is tightly fitted with the two evenly distributed air hole acrylic plates, so that the gas entering the drying module cannot flow through the gap without being dried;

[0011] The system shell is a rectangular parallelepiped with an open bottom, and the left and right sides are provided with a system air inlet and a system air outlet; preferably, the system air inlet is close to the object table; the system air inlet and the system air outlet are connected with the ventilation pipe through a conversion joint;

[0012] Preferably, a hygrometer is arranged in the middle of the system shell to understand whether the gas humidity in the wide spectrum terahertz time domain spectroscopy system meets the experimental requirements; when the humidity information displayed by the hygrometer meets the experimental requirements, the air suction speed of the fan is reduced to the minimum through the fan speed regulator.

[0013] The gas drying device of the utility model adopts the silica gel desiccant which can be recycled to dry the gas of the wide spectrum terahertz time domain spectroscopy system, and the device has the advantages of simple structure, easy integration, low cost of consumables, small size, self-made, and greatly solves the problems of high cost and heavy equipment of traditional drying instruments, the dryer can always dry the gas in the system shell, slow down the deliquescence of the detection crystal, and prolong the service life of the detection crystal. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1The utility model relates to a whole structure schematic diagram of a circulating gas drying device for a wide spectrum terahertz time domain spectroscopy system,

[0015] Figure 2 The device shell structure schematic diagram of the utility model one kind for the circulating gas drying device for wide spectrum terahertz time domain spectroscopy system,

[0016] Figure 3 The device shell structure schematic diagram of the utility model one kind for the circulating gas drying device for wide spectrum terahertz time domain spectroscopy system,

[0017] Figure 4 The utility model relates to a whole structure schematic diagram of a circulating gas drying device for a wide spectrum terahertz time domain spectroscopy system,

[0018] Figure 5 The device shell structure schematic diagram of the utility model one kind for the circulating gas drying device for wide spectrum terahertz time domain spectroscopy system,

[0019] Figure 6 The device shell structure schematic diagram of the utility model one kind for the circulating gas drying device for wide spectrum terahertz time domain spectroscopy system,

[0020] Figure 7 The utility model relates to a whole structure schematic diagram of a circulating gas drying device for a wide spectrum terahertz time domain spectroscopy system,

[0021] In the drawing: device shell 1, conveying module 2, fan 21, fan speed regulator 22, reducing joint 23, fan air inlet 24, drying module 3, system shell 4, system air inlet 41, system air outlet 42, conversion joint 5, clamp 6, ventilation pipe 7, object table 8, hygrometer 9, coverless shell 11, cover plate 12, baffle 13, air inlet 14, air outlet 15, power supply port 16, acrylic handle 121, acrylic square strip 122, silica gel sealing ring 31, silica gel pad 33, evenly distributed air hole acrylic plate 321, air filter paper 322, silica gel drier 323, net bag 324, joint 51, silica gel ring 52, nut 53, internal thread joint 54. DETAILED DESCRIPTION

[0022] The utility model relates to a whole structure schematic diagram of a circulating gas drying device for a wide spectrum terahertz time domain spectroscopy system, through conveying module, make the gas circulation flow in system shell, gas enters drying module, and fully contacts with silica gel drier, realize the function of dry air, the utility model replaces the prior art and passes into dry nitrogen to the wide spectrum terahertz time domain spectroscopy system and carries out drying, and the structure is simple, convenient operation.

[0023] The utility model will be further explained in detail in connection with the embodiments and drawings.

[0024] As Figure 1 shown, the embodiment provides a circulating gas drying device for wide spectrum terahertz time-domain spectroscopy system, which comprises a device shell 1, a conveying module 2, a drying module 3 and a system shell 4; the device shell 1 is used to accommodate the conveying module 2 and the drying module 3, the system shell 4 is used to accommodate the terahertz optical device, the device shell 1 is communicated with the system shell 4 by a ventilation pipe 7, and the gas in the system shell 4 flows back into the system shell 4 through the drying module 3 under the pushing of the conveying module 2, forming a gas circulation loop;

[0025] The system shell 4 is a rectangular parallelepiped with an open bottom and is composed of five acrylic plates bonded by acrylic glue, and is invertedly buckled on the optical device in the wide spectrum terahertz time-domain spectroscopy system; a system air inlet 41 and a system air outlet 42 are arranged on the left and right sides; preferably, the system air inlet 41 is close to a loading table 8; the system air inlet 41 and the system air outlet 42 are respectively communicated with the ventilation pipe 7 through a conversion joint 5;

[0026] Preferably, the system shell 4 is a rectangular parallelepiped with an inner size of 500mm*650mm*350mm, the plate thickness is 8mm, the aperture size of the system air inlet 41 and the system air outlet 42 is 40mm, and the pipe diameter of the ventilation pipe 7 is 40mm;

[0027] Preferably, a hygrometer 9 is arranged in the middle of the system shell 4 to understand whether the gas humidity in the wide spectrum terahertz time-domain spectroscopy system meets the experimental requirements; when the humidity information displayed by the hygrometer 9 meets the experimental requirements, the air suction speed of the fan 21 is reduced to the minimum through the fan speed regulator 22;

[0028] As Figure 2 and 3 shown, the device shell 1 comprises a coverless shell 11, a cover plate 12, a partition plate 13, an air inlet 14, an air outlet 15 and a power supply port 16; the partition plate 13 divides the coverless shell 11 into two spaces on the left and right sides to accommodate the conveying module 2 and the drying module 3, and a hole is arranged in the center of the partition plate 13 to communicate the conveying module 2 and the drying module 3; the air inlet 14 is arranged on the side of the coverless shell 11 accommodating the conveying module, the air outlet 15 is arranged on the side of the coverless shell 11 accommodating the drying module, and the conversion joint 5 is connected with the ventilation pipe 7 to make the gas dried and purified flow back into the system shell 4; the power supply port 16 is arranged at the front end of the coverless shell 11 accommodating the conveying module 2; the cover plates 12 are non-fixedly arranged at the top of the two spaces on the left and right sides of the coverless shell 11 to form closed spaces; the cover plate 12 is an acrylic plate provided with a handle 121, and an acrylic square bar 122 is arranged below the cover plate 12.

[0029] Preferably, the coverless shell 11 is a cuboid composed of five pieces of acrylic plate bonded by acrylic glue, with the top end set as an opening, the left center set as an air inlet 14, and the right center set as an air outlet 15. The conveying module 2 is placed in the left space inside the device shell 1, and the drying module 3 is placed in the right space inside the device shell 1. The baffle 13 is tightly bonded with the coverless shell 11 by acrylic glue.

[0030] Preferably, the inner size of the coverless shell 11 is 462mm x 210mm x 180mm, the size of the baffle 13 is 180mm x 210mm x 5mm, the baffle 13 is placed parallel to the side of the coverless shell 11, the distance between the baffle 13 and the side of the coverless shell 11 where the air inlet 14 is located is 297mm, which divides the coverless shell 11 into two spaces with a length ratio of 297:160. The center hole diameter of the baffle 13 is 80mm, the hole diameter of the air inlet 14 is 75mm, the hole diameter of the air outlet 15 is 40mm, the hole diameter of the power port 16 is 70mm, the thickness of the bottom plate of the coverless shell 11 is 10mm, and the thickness of the plate around is 6mm. The cover plate 124 at the top of the space containing the drying module increases the weight by increasing the thickness of the plate, and the acrylic square bar 122 is used to improve the sealing of the drying module space. When the air speed of the fan is the largest, no gas flows out from the cover plate 124 in the space containing the drying module 3. The cover plate 12 is not fixedly arranged on the coverless shell 11, which prevents the air pressure in the drying module 3 from being too large due to the blowing of the fan 21, thereby preventing damage to the drying module 3. Preferably, the thickness of the cover plate 123 at the top of the space containing the conveying module is 6mm, and the thickness of the cover plate 124 at the top of the space containing the drying module is 10mm. Preferably, the handle 121 is arranged in the middle of the cover plate 12, and the acrylic square bar 122 under the cover plate 123 at the top of the space containing the conveying module is arranged on both sides of the cover plate 123.

[0031] As shown in Figure 4 , the conveying module 2 includes a fan 21, a fan speed regulator 22, a reducing joint 23, and a clamp 6. The fan speed regulator 22 is fixed on the power port 16 to control the air suction speed of the fan 21, so that the air entering the drying module 3 is fully dried. The fan air inlet 24 penetrates the air inlet 14 of the device shell with the same hole diameter, and is in sealed communication with the ventilation pipe 7 in turn through the reducing joint 23 and the clamp 6. The clamp 6 is used to fix the sealing ventilation pipe 7 and the connection between the reducing joint 23. The air outlet of the fan 21 is connected with the hole in the middle of the baffle 13.

[0032] Preferably, screw holes are arranged at the bottom of the coverless shell 11 to realize the positioning and fixation of the fan 21 in the device shell 1. The size of the reducing joint 23 is 75mm x 35mm.

[0033] As shown in Figure 5 and6 As shown, the drying module 3 includes evenly distributed air holes acrylic plate 321, air filter paper 322, silica gel desiccant 323 and mesh bag 324; the evenly distributed air holes two acrylic plate 321 is placed parallel to the partition 13, four edges with no cover shell 11 by acrylic glue sealing paste fixed, the inside respectively completely covers a air filter paper 322, used for filtering and purifying gas; the middle area is filled with silica gel desiccant 323 packed with mesh bag 324, mesh bag 324 is used to facilitate the removal of silica gel desiccant;

[0034] Preferably, in the space containing the drying module, the air outlet of the fan 21 and the hole between the partition 13 are provided with silica gel sealing ring 31 to seal the gap, preventing the inflow of external air; preferably, the inner diameter of the silica gel sealing ring 31 is the same as the air outlet hole diameter of the fan 21, and the inner diameter of the silica gel sealing ring 31 is 75mm;

[0035] Preferably, according to the calculation of ventilation and resistance, the air hole diameter of the evenly distributed air hole acrylic plate 321 is 6mm, the hole spacing is 1mm, the plate thickness is 5mm, the distance between the two evenly distributed air hole acrylic plates 321 is 50mm, and the distance between the evenly distributed air hole acrylic plate 321 close to the partition 13 and the partition 13 is 50mm, and the size of the air filter paper 322 is 210mm×176mm;

[0036] Preferably, the no cover shell 11 of the space containing the drying module is provided with silica gel pad 33 around the top edge, which enhances the sealing of the drying module 3 and reduces the inflow of external air from the opening during operation; preferably, the acrylic strip 122 below the cover plate 124 at the top of the space containing the drying module is tightly attached to the two evenly distributed air hole acrylic plates 321, preventing the gas entering the drying module 3 from flowing through the gap without drying; preferably, the size of the acrylic strip 122 is 209mm×10mm×20mm, and the distance between the acrylic strips 122 below the cover plate 124 at the top of the space containing the drying module is 60mm;

[0037] As shown in the figure, Figure 7 As shown, the conversion joint 5 includes joint 51, silica gel ring 52, nut 53, inner wire joint 54; preferably, the size of the conversion joint 5 is 1 inch; the joint 51 and the silica gel ring 52 are on the inside of the system shell 4, the nut 53 is on the outside of the system shell 4, and the inner wire joint 54 is connected with the joint 51, and the ventilation pipe 7 is fixed on the inner wire joint 54 by the clamp 6; the conversion joint 5 is respectively arranged at the gas outlet 15, the system air inlet 41 and the system air outlet 42, and the silica gel ring 52 is used to prevent the inflow of external gas, ensuring the sealing and reliability of the gas drying device, and the installation is simple.

[0038] According to the embodiment of the present disclosure, the system air inlet 41 is arranged on one side close to the object table 8. For the detection crystal placed on the object table 8 in the system, the gas drying device can reduce the deliquescence rate of the crystal and prolong the service life of the detection crystal. In the gas drying device, the conveying module 2 is used to push the gas to flow in the circulation loop, the fan speed regulator 22 controls the air suction speed of the fan 21, adjusts the gas flow rate, and pushes the gas in the system shell 4 to flow back to the system shell 4 through the ventilation pipe 7 and the drying module 3, thereby forming a gas circulation loop. Even if the fan 21 does not work, the circulation loop can maintain the optical instrument in the system shell 4 in a dry environment, and reduce the time for drying the gas before preparing the experiment. In the embodiment, the drying module 3 is used to dry and purify the gas in the system shell 4; the gas entering the drying module 3 is in full contact with the air filter paper 322 and the silica gel desiccant 323 through the drying box 32, and after multiple circulation, the function of filtering, purifying and drying the air is realized. After the silica gel desiccant 323 is used for multiple times, it can be recycled after being heated by a microwave oven, thereby saving cost.

[0039] In the embodiment, the top ends of the left and right spaces in the coverless shell 11 are respectively provided with cover plates 2 to form closed spaces without fixing the cover plates 2. The closed spaces prevent air dust from entering the inside of the device shell and can protect the fan 31 without affecting the heat dissipation of the fan 31. Whether the cover plate 124 at the top end of the space accommodating the drying module contacts the coverless shell 11 or not is used to determine whether the air suction speed of the fan meets the requirements. When the gas pressure in the drying module 3 increases and the cover plate 124 contacts the coverless shell 11 and gas flows out, the fan speed regulator 22 controls the fan 21 to gradually reduce the air suction speed until no gas flows out at the contact position, thereby preventing the air pressure in the drying module 3 from being too large due to the blowing of the fan 21 and causing damage to the drying module 3. The cover plate 12 is further provided with an acrylic square strip 122 to prevent the cover plate 12 from sliding and to support the coverless shell 11 to prevent deformation.

[0040] According to the embodiment of the present disclosure, the silica gel sealing ring 31 and the silica gel pad 33 are additionally arranged in the drying module 3 to enhance the sealing performance. In the space accommodating the drying module, the silica gel sealing ring 31 seals the gap between the fan air outlet and the hole in the partition plate 13, thereby preventing external air from flowing into the gap. The silica gel pad 33 is used to enhance the sealing performance of the drying module 3 and reduce the inflow of external air from the opening during the operation of the device. The acrylic square strip 122 arranged below the cover plate 124 at the top end of the space accommodating the drying module is tightly attached to the two acrylic plates 321 with uniformly distributed air holes, thereby preventing the gas entering the drying module 3 from flowing through the gap without being dried.

[0041] The working principle of the gas drying device is: the fan speed regulator 22 is opened, the fan 21 blows the gas in the system shell 4 into the drying module 3 through the ventilation pipe 7, the gas flow of the drying module 3 is controlled by adjusting the fan speed regulator 22, the gas is fully contacted with the silica gel drying agent 323, the moisture in the gas is absorbed and the impurities are filtered after filtering and drying, and the system inlet 41 returns to the system shell 4, after multiple cycle drying, the function of dry air is realized, after the silica gel drying agent 323 is used for multiple times, after heating by the microwave oven, the silica gel drying agent 323 can be recycled, and the cost is saved.

Claims

1. A recirculating gas drying apparatus for a wide spectrum terahertz time-domain spectroscopy system, characterized by, It comprises a conveying module, a drying module, a device shell and a system shell; the device shell and the system shell are connected by a ventilation pipe to form a gas circulation loop; The device shell comprises a coverless shell, a cover plate, a partition plate, an air inlet, an air outlet and a power supply port; the partition plate divides the coverless shell into two spaces on the left and right sides to accommodate the conveying module and the drying module; the partition plate is provided with a hole in the middle to connect the conveying module and the drying module; the top of the two spaces in the coverless shell is provided with the left and right cover plates to form a closed space. The conveying module comprises a fan, a fan speed regulator, an adapter and a clamp; the fan inlet is connected to the air inlet of the device shell through the adapter and the clamp in sequence and is in sealed communication with the ventilation pipe; the fan outlet is connected to the hole in the middle of the partition plate. The drying module comprises two acrylic plates with uniformly distributed air holes, air filter paper, silica gel desiccant and a mesh bag; the two acrylic plates with uniformly distributed air holes are placed parallel to the partition plate and are fixed to the coverless shell by being tightly fitted on the four sides; the inner sides of the two acrylic plates are completely covered with air filter paper respectively to filter and purify the gas; the middle area is filled with silica gel desiccant packed in a mesh bag.

2. A recirculating gas drying apparatus for a wide spectrum terahertz time domain spectroscopy system according to claim 1, wherein, The air inlet of the device shell is located on the side of the coverless shell accommodating the conveying module, the air outlet is located on the side of the coverless shell accommodating the drying module, the air outlet is connected to the ventilation pipe through a conversion joint, and the power supply port is located at the front end of the coverless shell accommodating the conveying module; the fan speed regulator is fixed on the power supply port.

3. A recirculating gas drying apparatus for a wide spectrum terahertz time domain spectroscopy system according to claim 1, wherein, The cover plate is an acrylic plate provided with a handle, and an acrylic strip is arranged below the cover plate; the cover plate is not fixed on the coverless shell, the cover plate at the top of the space accommodating the drying module is increased in thickness to increase the weight, and when the fan speed is the maximum, no gas in the space accommodating the drying module flows out from the cover plate.

4. The recirculating gas drying apparatus for a broadband terahertz time-domain spectroscopy system according to claim 3, wherein The acrylic strip arranged below the cover plate at the top of the space accommodating the drying module is tightly fitted with the two acrylic plates with uniformly distributed air holes.

5. The recirculating gas drying apparatus for a wide spectrum terahertz time-domain spectroscopy system according to claim 1, wherein, In the space accommodating the drying module, a silica gel sealing ring is arranged between the fan outlet and the hole in the middle of the partition plate to seal the gap, and a silica gel pad is arranged around the top edge of the coverless shell of the space accommodating the drying module.

6. The recirculating gas drying apparatus for a wide spectrum terahertz time-domain spectroscopy system according to claim 1, wherein The coverless shell is a rectangular parallelepiped composed of five acrylic plates bonded by acrylic glue, the top end is provided with an opening, the left center is provided with an air inlet, and the right center is provided with an air outlet; the conveying module is arranged in the left space inside the device shell, and the drying module is arranged in the right space inside the device shell; the partition plate and the shell are tightly fitted by acrylic glue; screw holes are arranged at the bottom of the coverless shell to realize the positioning and fixation of the fan in the device shell.

7. A recirculating gas drying apparatus for a wide spectrum terahertz time domain spectroscopy system as defined in claim 3, wherein The size of the coverless shell is , the size of the air inlet hole is , the size of the power supply hole is , the size of the air outlet hole is , the size of the partition is , the size of the center hole of the partition is , the thickness of the bottom plate of the coverless shell is , and the thickness of the surrounding plate is ; The size of the sub-acrylic square ruler is The height of the cover plate accommodating the top end of the conveying module space is The height of the cover plate accommodating the top end of the drying module space is .

8. The recirculating gas drying apparatus for a wide spectrum terahertz time domain spectroscopy system of claim 1, wherein, The air hole diameter of the evenly distributed air hole PMMA plate is , the hole spacing is , the plate thickness is , the spacing between the two evenly distributed air hole PMMA plates is , the spacing between the evenly distributed air hole PMMA plate close to the partition plate and the partition plate is , and the size of the air filter paper is .

9. The recirculating gas drying apparatus for a wide spectrum terahertz time domain spectroscopy system of claim 1, wherein, The system shell is a rectangular parallelepiped with an open bottom, a hygrometer is arranged in the middle, a system air inlet is arranged on one side close to the object table, and a system air outlet is arranged on the other side; the system air inlet and the system air outlet are connected to the ventilation pipe through conversion joints respectively.

10. The recirculating gas drying apparatus for a wide spectrum terahertz time-domain spectroscopy system according to claim 2 or 9, characterized in that, The conversion joint is arranged on the air outlet, the system air inlet and the system air outlet and is connected to the ventilation pipe through a clamp.

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