Groove fixing frame of terahertz time-domain spectroscopy system and terahertz time-domain spectroscopy system

Abstract

The invention discloses a groove fixing frame of a terahertz time-domain spectroscopy system, the groove fixing frame comprises a frame body (1), the center of the frame body (1) is provided with a circular groove (4), and the upper and lower parts of the circular groove (4) are respectively provided with a nylon jackscrew (2). The nylon jackscrew (2) is arranged to be close to a tablet placed in the circular groove (4) so as to fasten the tablet or far away from the tablet so as to loosen the tablet; wherein the top end face and the bottom section of the frame body (1) are respectively provided with a threaded hole (3), the nylon jackscrew (2) is screwed into the threaded holes (3) and abuts against the tablets, and the central axis of the nylon jackscrew (2) and the center of the circular groove (4) are located on the same straight line. The groove fixing frame can be suitable for circular tablets with different thicknesses, the tight fit degree of the tablets and the small hollow cylinders of the grooves is kept, the detection time is saved, and the test result is optimized.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic radiation technology, and in particular to a groove fixing frame of a terahertz time-domain spectroscopy system and a terahertz time-domain spectroscopy system. Background Art

[0002] Terahertz (THz) refers to electromagnetic radiation with a frequency range of 0.1THz-10THz, which is between millimeter waves and far infrared and is the only spectrum resource to be developed in the electromagnetic spectrum. Terahertz waves have excellent characteristics such as large bandwidth, low damage, and characteristic spectrum. In particular, the vibration and rotation energy level transitions of many biological molecules are located in the terahertz band, which show strong absorption characteristics in this band, forming a unique fingerprint spectrum. Therefore, terahertz technology has great scientific research value and broad application prospects in research fields such as security inspection, medical imaging, environmental monitoring, satellite communications, and weapon guidance.

[0003] Terahertz technology mainly includes Fourier transform spectroscopy technology FTS and terahertz time-domain spectroscopy technology THz-TDS. Terahertz time-domain spectroscopy technology is the core research and development field of terahertz technology. Terahertz time-domain spectroscopy technology mainly studies the molecular absorption spectrum of substances in the terahertz band. The molecular vibration modes in the terahertz band are diverse and the information contained is richer. Compared with Fourier transform spectroscopy technology, terahertz time-domain spectroscopy technology has excellent properties such as phase information sensitivity, high time resolution, high accuracy and high signal-to-noise ratio. Therefore, terahertz time-domain spectroscopy technology is very suitable for material detection, and can quickly and effectively complete food quality testing, drug classification and identification, crop traceability, etc., and establish a characteristic spectrum library to expand the application field of terahertz.

[0004] In the terahertz transmission module, the terahertz wave is transmitted to the detection antenna through the sample circular tablet. The tablet is placed in the center groove of the ordinary fixing frame on the dry plate rack. There are no screws or other fixing tools around the groove, and the groove depth is small, with a depth of 1mm-2mm. During the test, the tablet diameter is determined, and the commonly used tablet thickness is 2mm-4mm. When the tablet thickness is greater than the groove depth, the tablet cannot fit tightly with the small hollow cylinder in the groove and is easy to fall off. At this time, the terahertz wave will directly pass through the gap between the side edge of the tablet and the inner circular edge of the small hollow cylinder, seriously affecting the material detection. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the groove depth of the fixing frame is shallow and there is a lack of fixing tools in the prior art, and to provide a groove fixing frame for a terahertz time-domain spectroscopy system. The groove fixing frame of the terahertz time-domain spectroscopy system can be suitable for round tablets of different thicknesses and maintain a close fit between the tablet and the small hollow cylinder of the groove, thereby saving detection time and optimizing test results.

[0006] In order to achieve the above-mentioned object, the present invention provides a groove fixing frame for a terahertz time-domain spectroscopy system, the groove fixing frame suitable for the terahertz time-domain spectroscopy system comprises a frame body, a circular groove is opened at the center of the frame body, a nylon head screw is respectively arranged at the upper and lower parts of the circular groove, and the nylon head screw is arranged to be able to approach a tablet placed in the circular groove to tighten the tablet or to move away from the tablet to loosen the tablet; wherein,

[0007] The top surface and the bottom section of the frame are both provided with threaded holes, the nylon head screw is screwed into the threaded hole and abuts against the tablet, and the central axis of the nylon head screw and the center of the circular groove are on the same straight line.

[0008] Preferably, the nylon head screw comprises a main body in the middle and a nylon head and a screw hole respectively arranged at two ends of the main body, the nylon head faces the circular groove for protecting the tablet, and the screw hole faces the threaded hole for fixing the tablet.

[0009] Preferably, the body is made of stainless steel.

[0010] Preferably, the screw hole is a hexagon socket screw hole.

[0011] Preferably, the circular groove comprises a coaxial large hollow cylinder and a small hollow cylinder, and one end face of the small hollow cylinder is coplanar with one end face of the large hollow cylinder; wherein,

[0012] The hollow diameters and depths of the large hollow cylinder and the small hollow cylinder match the diameter and depth of the tablet, so that when the tablet is placed in the large hollow cylinder, it can fit snugly against the small hollow cylinder and completely cover the hollow portion of the small hollow cylinder.

[0013] Preferably, when they are tightly attached, there is no gap between the side edge of the tablet and the inner circumference of the small hollow cylinder.

[0014] Preferably, the length and width of the frame are set to match the outer dimensions of the excitation antenna and the path of the excitation light path / detection light path in the terahertz time-domain spectroscopy system, and the thickness is set to match the thickness of the tablet to be tested or tested in the terahertz time-domain spectroscopy system.

[0015] Another aspect of the present invention provides a terahertz time-domain spectroscopy system, which includes a laser, an antenna, a delay line, a phase-locked amplifier, and a groove fixing frame of the terahertz time-domain spectroscopy system as described above.

[0016] According to the above technical scheme, the present invention opens a circular groove at the center of the frame, and a nylon head screw is respectively arranged at the upper and lower parts of the circular groove. The nylon head screw is arranged to be close to the tablet placed in the circular groove to tighten the tablet or away from the tablet to loosen the tablet. In addition, threaded holes are opened on the top surface and the bottom section of the frame, and the nylon head screw can be screwed into the threaded hole and abut against the tablet, and the central axis of the nylon head screw is on the same straight line as the center of the circular groove. When in use, the nylon head screw on the bottom surface of the frame is first fine-tuned so that when the tablet is placed in the circular groove, there is no obvious gap on the edge of the tablet. At this time, the frame is fixed to the dry plate frame again, and the position of the frame is determined according to the size and position of the transmitted terahertz light spot, and then tablets of different thicknesses are placed in the circular groove. After confirming that there is no gap on the edge of the tablet, the nylon head screw on the top surface of the frame is rotated through the screw hole until the nylon head screw is close to the tablet, and finally the tablet is firmly fixed.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 is a schematic structural diagram of a groove fixing frame of a terahertz time-domain spectroscopy system provided by the present invention;

[0020] Figure 2 It is a structural schematic diagram of a nylon head screw in a groove fixing frame of a terahertz time-domain spectroscopy system provided by the present invention;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of a circular groove in a groove fixing frame of a terahertz time-domain spectroscopy system provided according to the present invention.

[0022] Description of Reference Numerals

[0023] 1-frame 2-nylon head screw

[0024] 21-Main body 22-Nylon head

[0025] 23-screw hole 3-thread hole

[0026] 4-Circular groove 41-Large hollow cylinder

[0027] 42- small hollow cylinder 43- inner side of large hollow cylinder

[0028] 44-Inner side of small hollow cylinder DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0030] In the present invention, unless otherwise stated, directional words such as "top, bottom, inside, outside, up, down" contained in the terms merely represent the orientation of the terms in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the terms.

[0031] See also Figure 1 The present invention provides a groove fixing frame for a terahertz time-domain spectroscopy system. The groove fixing frame suitable for the terahertz time-domain spectroscopy system comprises a frame body 1, a circular groove 4 is provided at the center of the frame body 1, and a nylon head screw 2 is provided above and below the circular groove 4. The nylon head screw 2 is configured to be able to approach a tablet placed in the circular groove 4 to tighten the tablet or to be away from the tablet to loosen the tablet; wherein,

[0032] The top surface and the bottom section of the frame body 1 are both provided with threaded holes 3, and the nylon head screw 2 is screwed into the threaded hole 3 and abuts against the tablet, and the central axis of the nylon head screw 2 and the center of the circular groove 4 are on the same straight line.

[0033] Through the above technical scheme, a circular groove 4 is opened at the center of the frame 1, and a nylon head screw 2 is set at the upper and lower parts of the circular groove 4. The nylon head screw 2 is set to be able to approach the tablet placed in the circular groove 4 to tighten the tablet or to be away from the tablet to loosen the tablet. In addition, a threaded hole 3 is opened on the top surface and the bottom section of the frame 1, and the nylon head screw 2 can be screwed into the threaded hole 3 and abut against the tablet, and the central axis of the nylon head screw 2 is on the same straight line as the center of the circular groove 4. When in use, first fine-tune the nylon head screw 2 on the bottom surface of the frame 1 so that when the tablet is placed in the circular groove 4, there is no obvious gap on the edge of the tablet. At this time, the frame 1 is fixed to the dry plate rack again, and the position of the frame 1 is determined according to the size and position of the transmitted terahertz light spot, and then tablets of different thicknesses are placed in the circular groove 4. After confirming that there is no gap on the edge of the tablet, the nylon head screw 2 on the top surface of the frame 1 is rotated through the screw hole until the nylon head screw 2 is close to the tablet, and finally the tablet is firmly fixed.

[0034] In this embodiment, in order to simplify the structure of the nylon head screw 2 and facilitate the adjustment operation, so as to realize the fixing function quickly and simply, preferably, the nylon head screw 2 includes a main body 21 located in the middle and a nylon head 22 and a screw hole 23 respectively arranged at both ends of the main body 21, the nylon head 22 faces the circular groove 4 to protect the tablet, and the screw hole 23 faces the threaded hole 3 to fix the tablet. With this structure, when in use, hold the end of the screw hole 23, insert the nylon head 22 end from the screw hole 23 until the nylon head 22 end enters the screw hole 23, then use a tool to cooperate with the screw hole 23, rotate the screw hole 23 to drive the main body 21 to rotate and continue to move forward until the nylon head 22 is tightly against the tablet in the circular groove 4, and the nylon head screw 2 structure is provided in both the upper and lower directions of the circular groove 4, so that the tablet can be fixed from both the upper and lower directions, so that the stability of the tablet after fixation is greatly improved, and the fit between the tablet and the circular groove 4 is enhanced.

[0035] The main body 21 needs to have a relatively hard texture to avoid bending or twisting after repeated use and adjustment, thereby ensuring its service life. In the present embodiment, the main body 21 is preferably made of stainless steel, which can also cooperate with the frame 1 to maintain the consistency of the structural material.

[0036] When a tool is inserted into the screw hole 23 for rotation, in order to facilitate and quickly operate and reduce the overall weight of the nylon head screw 2, the screw hole 23 is preferably a hexagon socket screw hole.

[0037] In this embodiment, the circular groove 4 includes a coaxial large hollow cylinder 41 and a small hollow cylinder 42, and one end surface of the small hollow cylinder 42 is coplanar with one end surface of the large hollow cylinder 41; wherein,

[0038] The hollow diameter and depth of the large hollow cylinder 41 and the small hollow cylinder 42 match the diameter and depth of the tablet, so that when the tablet is placed in the large hollow cylinder 41, it can fit snugly against the small hollow cylinder 42 and completely cover the hollow part of the small hollow cylinder 42. That is to say, when they fit snugly, there is no gap between the side edge of the tablet and the inner circular edge of the small hollow cylinder 42. With this structure, the hollow diameter and depth of the large hollow cylinder 41 are determined by the tablet, the hollow diameter of the small hollow cylinder 42 is determined by the tablet, and the depth of the small hollow cylinder 42 is determined by the overall weight of the frame 1 and the spatial size of the terahertz time-domain spectroscopy system. Specifically, the circular groove 4 is hollow in the middle, and the hollow diameter is slightly smaller than the tablet diameter, while the hollow diameter of the large hollow cylinder 41 of the circular groove 4 is slightly larger than the tablet diameter. The frame 1 is fixed in the terahertz transmission system through a dry plate rack. Since terahertz waves cannot penetrate polar materials such as metals, the material of the frame 1 can be stainless steel, aluminum alloy, etc. In this way, the terahertz wave only penetrates from the hollow part of the small hollow cylinder 42 of the circular groove 4 in the middle of the frame 1, that is, when no tablet is placed in the circular groove 4, the center position of the frame 1 is determined by the center of the terahertz light spot that penetrates through the hollow part of the small hollow cylinder 42 of the circular groove 4. The length and width of the frame 1 are set to match the outer dimensions of the excitation antenna in the terahertz time-domain spectroscopy system and the path of the excitation light path / detection light path of the terahertz time-domain spectroscopy system, and the thickness is set to match the thickness of the tablet to be tested or tested in the terahertz time-domain spectroscopy system. In order to occupy as little space as possible in the terahertz transmission system and facilitate overall use, the thickness of the frame 1 can be preferably 5-6mm and within the clampable thickness range of the ordinary dry plate rack.

[0039] In a specific embodiment, the frame 1 is composed of six faces, the frame 1 is shaped like a cuboid, the frame 1 is solid, the frame 1 is 70 mm long, 60 mm wide, and 5 mm thick. There is a threaded hole 3 on the top and bottom of the frame 1, and the depth of the two threaded holes 3 runs through the entire width of the frame 1, with a diameter of 2 mm. The straight line where the center of the threaded holes 3 on the top and bottom is located is perpendicular to the length of the frame 1, and the center of the hollow cylinder of the circular groove 4 is on the straight line where the center of the threaded holes 3 on the top and bottom is located. There are nylon head screws 2 in the threaded holes 3, such as Figure 2 As shown, the nylon head screw 2 includes a main body 21, a nylon head 22 and a screw hole 23. The main body 21 is made of 304 stainless steel, has a length of 20 mm and a diameter of 2 mm, the nylon head 22 has a diameter of 1-3 mm and a thickness of 1-2 mm, and the screw hole 23 is a hexagon socket. The nylon head screw 2 can be controlled to move up and down by rotating the screw hole 23 with a hexagon socket handle.

[0040] like Figure 3As shown, the circular groove 4 includes a large hollow cylinder 41, a small hollow cylinder 42, an inner side surface 43 of the large hollow cylinder and an inner side surface 44 of the small hollow cylinder. The center of the bottom surface of the large hollow cylinder 41 is at the same position as the center of the front of the frame 1. The inner diameter of the large hollow cylinder 41 is 13.5 mm and the depth is 4 mm. The large hollow cylinder 41 is equivalent to chiseling a cylindrical hole with a diameter of 13.5 mm and a depth of 4 mm in the front of the frame 1. The center of the bottom surface of the small hollow cylinder 42 is at the same position as the center of the back of the frame 1. The inner diameter of the small hollow cylinder 42 is 12.5 mm and the depth is 1 mm. The small hollow cylinder 42 is equivalent to chiseling a cylindrical hole with a diameter of 12.5 mm and a depth of 1 mm in the back of the frame 1.

[0041] When in use, first, fine-tune the nylon screw 2 on the bottom surface of the frame 1 so that when the tablet is placed in the circular groove 4, there is no obvious gap on the edge of the tablet, then fix the frame 1 to the dry plate rack, determine the position of the frame 1 according to the size and position of the transmitted terahertz light spot, place tablets of different thicknesses in the circular groove 4 and close to the small hollow cylinder 42, and after confirming that there is no gap on the edge of the tablet, rotate the screw hole 23 of the nylon head screw 2 on the top surface of the frame 1 until the nylon head 22 in the nylon head screw 2 is close to the tablet. The groove fixing frame of the entire terahertz time-domain spectroscopy system has a simple structure and is easy to install, disassemble and operate. The two nylon head screws 2 ensure the stability of the tablet in the circular groove 4. The effective depth of the large hollow cylinder 41 of the circular groove 4 adapts to the variability of the tablet thickness. The combination of the large hollow cylinder 41 and the small hollow cylinder 42 of the circular groove 4 improves the transmitted terahertz signal and is suitable for miniaturized and portable terahertz time-domain spectrometers.

[0042] In addition, the present invention also provides a terahertz time-domain spectroscopy system, which includes a laser, an antenna, a delay line, a phase-locked amplifier, and the groove fixing frame of the terahertz time-domain spectroscopy system as described above, so that in the terahertz transmission system, when the excitation antenna emits terahertz light passing through the hollow part of the small hollow cylinder 42 of the circular groove 4 on the groove fixing frame, the terahertz wave can be basically transmitted from the hollow part to the detection antenna, thereby avoiding the terahertz signal from leaking from the edge of the tablet.

[0043] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0045] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A groove fixing frame for a terahertz time-domain spectroscopy system, characterized in that: The groove fixing frame suitable for a terahertz time-domain spectroscopy system comprises a frame body (1), a circular groove (4) is provided at the center of the frame body (1), and a nylon head screw (2) is provided above and below the circular groove (4), respectively, and the nylon head screw (2) is arranged to be able to approach a tablet placed in the circular groove (4) to fasten the tablet or to move away from the tablet to loosen the tablet; wherein, The top surface and bottom section of the frame (1) are both provided with threaded holes (3), the nylon head screw (2) is screwed into the threaded hole (3) and rests against the tablet, and the central axis of the nylon head screw (2) and the center of the circular groove (4) are on the same straight line.

2. The groove fixing frame of the terahertz time-domain spectroscopy system according to claim 1, characterized in that: The nylon head screw (2) comprises a main body (21) located in the middle, and a nylon head (22) and a screw hole (23) respectively arranged at two ends of the main body (21), the nylon head (22) faces the circular groove (4) for protecting the tablet, and the screw hole (23) faces the threaded hole (3) for fixing the tablet.

3. The groove fixing frame of the terahertz time-domain spectroscopy system according to claim 2, characterized in that: The main body (21) is made of stainless steel.

4. The groove fixing frame of the terahertz time-domain spectroscopy system according to claim 2, characterized in that: The screw hole (23) is a hexagon socket screw hole.

5. The groove fixing frame of the terahertz time-domain spectroscopy system according to claim 1, characterized in that: The circular groove (4) comprises a coaxial large hollow cylinder (41) and a small hollow cylinder (42), and one end surface of the small hollow cylinder (42) is coplanar with one end surface of the large hollow cylinder (41); wherein, The hollow diameter and depth of the large hollow cylinder (41) and the small hollow cylinder (42) match the diameter and depth of the tablet, so that when the tablet is placed in the large hollow cylinder (41), it can fit snugly against the small hollow cylinder (42) and completely cover the hollow portion of the small hollow cylinder (42).

6. The groove fixing frame of the terahertz time-domain spectroscopy system according to claim 5, characterized in that: When tightly attached, there is no gap between the side edge of the tablet and the inner circumference of the small hollow cylinder (42).

7. The groove fixing frame of the terahertz time-domain spectroscopy system according to claim 1, characterized in that: The length and width of the frame (1) are configured to match the outer dimensions of an excitation antenna and the paths of an excitation light path / detection light path in a terahertz time-domain spectroscopy system, and the thickness is configured to match the thickness of a tablet to be tested or tested in the terahertz time-domain spectroscopy system.

8. A terahertz time-domain spectroscopy system, characterized in that: The terahertz time-domain spectroscopy system comprises a laser, an antenna, a delay line, a phase-locked amplifier, and a groove fixing frame of the terahertz time-domain spectroscopy system according to any one of claims 1 to 7.

Images