Multi-dimensional adjusting device, automatic light path adjusting device of terahertz time-domain spectroscopy system

Abstract

The application discloses a multi-dimensional adjusting device, a to-be-adjusted component is fixed at the top of a fixed telescopic rod, an axial adjusting motor is connected with a translation table to drive the translation table to move in the axial direction, a height adjusting motor is connected with the translation table to drive the translation table to move up and down, a worm gear is connected with an angle adjusting motor at one end and is rotationally connected with the translation table, a turbine is embedded and fixed in a fixed frame body, a first through hole is formed in the fixed frame body and is coaxial with the turbine, a telescopic rod at the upper part of the fixed telescopic rod is fastened in the first through hole, the other end of the worm gear is rotationally connected with the fixed frame body and is inserted into the fixed frame body to be engaged with the turbine. When the to-be-adjusted component is an optical element in a terahertz time-domain spectroscopy system, the multi-dimensional adjusting device, a guide rail, a motor controller, an upper computer, an optical path adjusting control unit and a motor control unit form an automatic optical path adjusting device of the terahertz time-domain spectroscopy system. The optical element can be adjusted in the axial direction, the height and the angle.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of free optical path adjustment, and particularly relates to an automatic optical path adjustment device of a terahertz time-domain spectroscopy system. BACKGROUND

[0002] Whether optical experiment or optical equipment building involves free optical path adjustment, which has high precision requirements on the position, height, angle and other dimensions of each optical element in the optical path. At present, the commonly used free optical path adjustment method is manual adjustment, combined with some auxiliary tools (point laser with high concentricity, height gauge, probe, variable diaphragm, etc.) to make the main optical axis of each optical element on the same straight line. A good optical path needs to be repeatedly adjusted in multiple dimensions such as position, height, angle, etc. Such adjustment method has strong dependence on experience, and it is difficult to ensure precision and stability, and the operation is complicated and the efficiency is very low.

[0003] In the construction of the terahertz time-domain spectroscopy system based on photoconductive antenna, the terahertz free optical path is composed of four plano-convex lenses and a pair of photoconductive antennas, and follows the "8f optical path rule", f being the focal length of the used lens. That is, each optical element (photoconductive transmitting antenna, four plano-convex lenses, photoconductive detecting antenna) needs to meet the 8f optical path rule in axial distance, and also needs to maintain high concentricity.

[0004] At present, the terahertz free optical path debugging method is mainly manual adjustment: fixing the guide rail on the optical platform, connecting the extension rod of each optical element to the guide rail, and roughly determining the axial distance of each optical element according to the "8f optical path rule", and roughly determining that the main optical axis of each element is on the same straight line by using the height gauge, and then manually adjusting the multiple dimensions (axial, height, angle, etc.) of each optical element in the optical path to make it have high concentricity. In the process of adjusting multiple dimensions of the optical path, the optical path needs to be connected to the terahertz time-domain spectrometer, and the quality of the optical path is judged by the terahertz time-domain signal strength collected by the upper computer software. The existing adjustment method needs to repeatedly collect terahertz time-domain signals to judge the quality of the optical path when adjusting each dimension, which is complicated and time-consuming, and the precision is not high due to more human operation. SUMMARY

[0005] The application aims to overcome the shortcomings of the prior art, and seeks to design a multi-dimensional adjustment device and an automatic optical path adjustment device of a terahertz time-domain spectroscopy system.

[0006] In order to achieve the above object, the multi-dimensional adjusting device comprises a fixed telescopic rod, a fixed frame, an electric adjusting platform, a component to be adjusted is fixed on the top of the fixed telescopic rod, the electric adjusting platform comprises a worm, an axial adjusting motor, a height adjusting motor, an angle adjusting motor and a translation platform, the axial adjusting motor is connected with the translation platform to drive the translation platform to move in the axial direction, the height adjusting motor is connected with the translation platform to drive the translation platform to move up and down, one end of the worm is connected with the angle adjusting motor and is rotatably connected with the translation platform through a through hole penetrating the translation platform, the fixed frame comprises a fixed frame body and a worm wheel, the worm wheel is embedded and fixed in the fixed frame body, a first through hole penetrating the fixed frame body is formed on the fixed frame body, the telescopic rod on the upper part of the fixed telescopic rod is fastened in the first through hole, the other end of the worm is rotatably connected with the fixed frame body and is embedded in the fixed frame body to engage with the worm wheel.

[0007] Further, the fixed frame body is divided into a left fixed frame and a right fixed frame, the worm wheel is divided into a left half worm wheel and a right half worm wheel, the left half worm wheel is fixedly embedded in the left fixed frame, the right half worm wheel is embedded in the right fixed frame, the telescopic rod is arranged in the first through hole formed in the middle of the left fixed frame and the right fixed frame, and is fixed and locked through the locking frames on the two sides of the left fixed frame and the right fixed frame.

[0008] Further, the fixed frame further comprises a worm fixing frame, the worm fixing frame is rotatably connected with the through hole penetrating the side of the right fixed frame, the other end of the worm is connected with the worm fixing frame to drive the worm fixing frame to rotate, and the external teeth of the worm wheel are engaged with the external teeth of the worm fixing frame.

[0009] The component to be adjusted is an optical element, and the multi-dimensional adjusting device is an automatic optical path adjusting device.

[0010] Specifically, an automatic optical path adjustment device of a terahertz time-domain spectroscopy system, comprising the automatic optical path adjustment device, a guide rail, a motor controller, a host computer, an optical path adjustment control unit and a motor control unit, for the terahertz time-domain spectroscopy system, optical elements including a photoconductive transmitting antenna, four plano-convex lenses and a photoconductive detecting antenna, in corresponding order, the optical elements are slidably connected to the guide rail through corresponding fixed extension rods, forming a terahertz spectrum free optical path, under the guidance of the guide rail, each optical element realizes axial linear motion, the motor controller is connected with an axial adjustment motor, a height adjustment motor and an angle adjustment motor respectively, providing electric energy and sending control signals, the host computer is connected with the motor controller, the optical path adjustment control unit is a terahertz time-domain spectroscopy system control software installed in the host computer, used for controlling the switch of the terahertz time-domain spectrometer and displaying the terahertz signal in real time, obtaining the change of the terahertz time-domain pulse signal, the motor control unit is a control software of the motor in the automatic optical path adjustment device installed in the host computer, based on the received change of the terahertz time-domain pulse signal, the motor control unit sends a motor motion instruction to the motor controller, that is, the optical path adjustment control unit is connected with the motor controller through the motor control unit.

[0011] The present application relates to a kind of terahertz time-domain spectroscopy system automatic optical path adjustment device adjustment method, specifically comprising the following steps:

[0012] (1) according to fixed structure, each optical element in the terahertz free optical path is combined with fixed extension rod and fixed frame, and it is placed on guide rail, constructs terahertz free optical path, fixed frame is connected with electrically controlled adjustment platform by worm gear, motor controller is connected with electrically controlled adjustment platform, and is connected to host computer.

[0013] (2) the terahertz free optical path is connected to terahertz time-domain spectrometer, and the instrument is started by optical path adjustment control unit, host computer detects and displays terahertz signal in real time, at this time, the motion sequence of each electrically controlled adjustment platform corresponding to each optical element in optical path adjustment control unit is set, and the motion sequence, rotation speed, rotation accuracy, rotation direction, rotation angle threshold value of each adjustment motor in each electrically controlled adjustment platform, motion instruction is sent to motor controller, each adjustment motor will move in turn, in the adjustment process, optical path adjustment control unit displays adjustment signal in real time, after comparing real-time adjustment signal through the development of algorithm and the optimization of algorithm learning, the result is fed back to motor control unit, if signal is optimized, corresponding instruction is sent to automatic optical path adjustment device, so that it continues to move in the threshold value range according to the predetermined direction and set parameters, each optical element in the optical path to be adjusted connected to corresponding system moves, and real-time signal is fed back to optical path adjustment control unit, the result is fed back to motor control unit after comparison, and this cycle is stopped until the signal is optimal. After fixing each optical element in the adjusted terahertz free optical path, the automatic optical path adjustment device is removed.

[0014] Compared with the prior art, the present invention has the following advantages: (1) The multi-dimensional adjustment device realizes the adjustment of components in multiple dimensions such as axis, height and angle; (2) For the first time, electric adjustment is introduced into free optical path adjustment, and the method and device of automatic optical path adjustment are described. The optical path is adjusted by the movement of the motor in the device to drive the optical element to move in three dimensions of axis, height and angle, thus realizing automatic optical path adjustment. The device is also easy to install and disassemble. In addition, taking the adjustment of the terahertz free optical path in the terahertz time domain spectroscopy system as an example, a complete adjustment device diagram is given; (3) Automatic optical path adjustment no longer simply imitates the adjustment of individual components by human, but adds real-time feedback and collaborative adjustment, so that multiple or even all components can be adjusted synchronously in multiple dimensions at the same time. Through the development of the algorithm and the learning and optimization of the algorithm, high-speed closed-loop adjustment control can be realized, making the optical path adjustment more efficient. While saving manpower, it shortens the required time and improves the quality of the adjusted optical path. Attached image description:

[0015] Figure 1 This is a schematic diagram of the multidimensional adjustment device involved in the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the fixing frame involved in the present invention.

[0017] Figure 3 This is a schematic diagram of the internal structure of the fixing frame involved in the present invention.

[0018] Figure 4 This is a schematic diagram of the terahertz time-domain spectral optical path adjustment system involved in the present invention.

[0019] Figure 5 This is a control flowchart of the terahertz time-domain spectral optical path adjustment method involved in the present invention. Detailed implementation method:

[0020] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0021] Example 1:

[0022] like Figures 1-4 As shown, a multi-dimensional adjustment device includes a fixed telescopic rod 3, a fixed frame 4, and an electric adjustment platform 5. The component to be adjusted is fixed to the top of the fixed telescopic rod 3. The electric adjustment platform 5 includes a worm gear 51, an axial adjustment motor 52, a height adjustment motor 53, an angle adjustment motor 54, and a translation platform 55. The axial adjustment motor 52 is connected to the translation platform 55, driving the translation platform 55 to move axially (i.e., Figure 4The height adjusting motor 53 is connected with the translation stage 55 and drives the translation stage to move up and down, one end of the worm 51 is connected with the angle adjusting motor 54, and the worm 51 is rotationally connected with the translation stage 55 through the through hole penetrating the translation stage 55. The fixed frame 4 comprises a fixed frame body and a worm wheel 43, the worm wheel 43 is embedded in the fixed frame body, a first through hole 44 penetrating up and down is formed in the fixed frame body coaxially with the worm wheel 43, the telescopic rod at the upper part of the fixed telescopic rod 3 is fastened in the first through hole 44, the other end of the worm 51 is rotationally connected with the fixed frame body and extends into the fixed frame body to engage with the worm wheel 43, the angle adjusting motor 54 drives the worm 51 to rotate, and then drives the worm wheel 43 to rotate, that is, the rotation of the fixed frame 4 is realized, the rotation of the telescopic rod is driven by the fixed frame 4, and then the angle of the component to be adjusted is adjusted. With the rotation of the axial adjusting motor 52 or the height adjusting motor 53, the translation stage 55, the worm 51, the fixed frame 4 and the telescopic rod are sequentially driven to move in the axial or height direction, and then the axial and height adjustment of the component to be adjusted is realized. With the rotation of the angle adjusting motor 54, the worm 51, the worm wheel 43, the fixed frame 4 and the telescopic rod are sequentially driven to rotate, and then the angle adjustment of the component to be adjusted is realized. The multi-dimensional adjustment device realizes the automatic adjustment of the height, front and back and angle of the component to be adjusted.

[0023] As shown in Figure 2 and 3 Specifically, in order to fasten the telescopic rod in the first through hole 44 more conveniently, the fixed frame body is divided into a left fixed frame and a right fixed frame, the worm wheel is divided into a left half worm wheel and a right half worm wheel, the left half worm wheel is embedded in the left fixed frame, the right half worm wheel is embedded in the right fixed frame, the telescopic rod is arranged in the first through hole 44 formed in the middle of the left fixed frame and the right fixed frame, and is fixed and locked through the locking frames 41 on the two sides of the left fixed frame and the right fixed frame. The fixed frame 4 further comprises a worm fixing frame 42, the worm fixing frame 42 is rotationally connected with the through hole penetrating the side of the right fixed frame, the other end of the worm 51 is connected with the worm fixing frame 42, the worm fixing frame 42 is driven to rotate, and the teeth uniformly distributed on the outer side of the worm fixing frame 42 engage with the outer teeth of the worm wheel 43.

[0024] Specifically, the fixed telescopic rod 3 is a conventional fixed telescopic rod structure, generally comprising a fixed base, a telescopic rod and a fixed nut, the telescopic rod is sleeved with the fixed base, the telescopic rod is pulled out of the fixed base and is fastened through the fixed nut. In this embodiment, the telescopic rod is driven to move up and down by the height adjusting motor 53, and after reaching the set position, the telescopic rod is fixed through the fixed nut.

[0025] Specifically, the output ends of the axial adjustment motor 52 and the height adjustment motor 53 are connected with the translation table through a conventional screw-nut structure, so as to convert the rotation of the motor into linear motion in the axial and height directions. The electrically adjustable table 5 further comprises a base plate 56, and the translation table 55 is slidably connected with the base plate 56. Under the driving of the axial adjustment motor 52, the translation table 55 moves forward and backward along the base plate, and under the driving of the height adjustment motor 53, the translation table 55 moves up and down relative to the base plate.

[0026] Further, the component to be adjusted is an optical element, and the multi-dimensional adjustment device is an automatic optical path adjustment device, which is applied to a terahertz spectrum optical path adjustment system.

[0027] Specifically, an automatic optical path adjustment device for a terahertz time-domain spectrum system comprises the automatic optical path adjustment device, a guide rail 1, a motor controller 6, a host computer 7, an optical path adjustment control unit and a motor control unit. For the terahertz time-domain spectrum system, optical elements include a photoconductive transmitting antenna, four plano-convex lenses and a photoconductive detecting antenna. The optical elements are slidably connected to the guide rail 1 through corresponding fixed extension rods 3 in a corresponding order to form a terahertz spectrum free optical path. Under the guidance of the guide rail 1, each optical element 2 realizes axial linear motion. The motor controller 6 is connected with an axial adjustment motor 52, a height adjustment motor 53 and an angle adjustment motor 54 respectively to provide electric energy and send control signals. The host computer 7 is connected with the motor controller 6. The optical path adjustment control unit is terahertz time-domain spectrum system control software installed in the host computer, which is used to control the switch of the terahertz time-domain spectrometer and display the terahertz signal in real time to obtain the change of the terahertz time-domain pulse signal (signal becomes better, signal becomes optimal, signal is optimal). The motor control unit is control software of the motor in the automatic optical path adjustment device installed in the host computer, which sends motor motion instructions to the motor controller 6 based on the received change of the terahertz time-domain pulse signal, that is, the optical path adjustment control unit is connected with the motor controller 6 through the motor control unit.

[0028] The embodiment relates to an automatic optical path adjustment device adjustment method for a terahertz time-domain spectrum system, which specifically comprises the following steps:

[0029] (1) According to a fixed structure, each optical element 2 in the terahertz free optical path is combined with a fixed extension rod 3 and a fixed frame 4, and is placed on a guide rail 1 to construct a terahertz free optical path. The fixed frame 4 is connected with an electrically adjustable table 5 through a worm 51. A motor controller 6 is connected with the electrically adjustable table 5 and is connected to a host computer 7.

[0030] (2) Connect the terahertz free optical path to the terahertz time-domain spectrometer, and turn on the instrument through the optical path adjustment control unit. The upper computer 7 detects and displays the terahertz signal in real time. At this time, the movement sequence of each motor in each electric adjustment platform 5 corresponding to each optical element 2, the threshold value of the rotation speed, the rotation accuracy, the rotation direction, and the rotation angle of each motor in each electric adjustment platform 5 are set in the optical path adjustment control unit, and the movement instruction is sent to the motor controller. Each adjustment motor will move in turn. During the adjustment process, the optical path adjustment control unit displays the adjustment signal in real time. After comparing the real-time adjustment signal through the development and optimization of the algorithm and the learning of the algorithm, the result is fed back to the motor control unit. If the signal is optimized (the general judgment basis is the maximum peak-to-peak value), send the corresponding instruction to the automatic optical path adjustment device to continue moving in the predetermined direction and the set parameters within the threshold value (vice versa, adjust in the opposite direction). Each optical element in the optical path to be adjusted corresponding to the system moves and feeds back the real-time signal to the optical path adjustment control unit. After comparison, the result is fed back to the motor control unit. This cycle continues until the signal is optimal, and then the movement stops. After fixing each optical element in the adjusted terahertz free optical path, remove the automatic optical path adjustment device.

[0031] For example, the adjustment sequence of each optical element 2 is photoconductive transmitting antenna, four plano-convex lenses, and photoconductive detecting antenna. The movement sequence of each motor corresponding to each optical element is axial adjustment motor 52 (rotation speed a1, rotation accuracy b1, clockwise first and then counterclockwise, threshold value c1 of rotation angle), height adjustment motor 53 (rotation speed a2, rotation accuracy b2, clockwise first and then counterclockwise, threshold value c2 of rotation angle), and angle adjustment motor 54 (rotation speed a3, rotation accuracy b3, clockwise first and then counterclockwise, threshold value c3 of rotation angle). The axial adjustment motor 52 rotates clockwise according to the pre-set parameters. If the terahertz time-domain signal quality is optimized (the general judgment basis is the maximum peak-to-peak value), continue to rotate clockwise. Otherwise, rotate counterclockwise. Until the terahertz time-domain pulse signal peak-to-peak value reaches the maximum within the threshold value of the rotation angle, and then stop. Then, the height adjustment motor 53 corresponding to each optical element 2 moves according to the pre-set parameters. When the signal is optimal, stop. Then, the angle adjustment motor 54 corresponding to each optical element 2 moves according to the pre-set parameters. When the signal is optimal, stop.

[0032] In order to improve its accuracy, the adjustment sequence of each optical element 2 and the movement sequence of each motor in each electric adjustment platform 4 can be changed. Repeat the adjustment several times to obtain a terahertz free optical path with a better terahertz time-domain pulse signal.

Claims

1. A device for automatic optical path adjustment of a terahertz time-domain spectroscopy system, characterized in that, The automatic optical path adjusting device, the guide rail, the motor controller, the upper computer, the optical path adjusting control unit and the motor control unit, The automatic optical path adjusting device includes a fixed telescopic rod, a fixed frame, an electric adjusting table, a to-be-adjusted component is fixed on the top of the fixed telescopic rod, the electric adjusting table includes a worm, an axial adjusting motor, a height adjusting motor, an angle adjusting motor and a translation table, the axial adjusting motor is connected with the translation table, drives the translation table to move in the axial direction, the height adjusting motor is connected with the translation table, drives the translation table to move up and down, one end of the worm is connected with the angle adjusting motor, and the worm is rotationally connected with the translation table through the through hole penetrating the translation table, the fixed frame includes a fixed frame body and a worm wheel, the worm wheel is embedded and fixed in the fixed frame body, a first through hole penetrating the fixed frame body is formed on the fixed frame body, the telescopic rod at the upper part of the fixed telescopic rod is fastened in the first through hole, the other end of the worm is rotationally connected with the fixed frame body and extends into the fixed frame body and engages with the worm wheel; The to-be-adjusted component is an optical element, the optical element is slidably connected to the guide rail through the corresponding fixed telescopic rod, and the fixed telescopic rod includes a fixed base and a telescopic rod. For the terahertz time-domain spectroscopy system, the optical element includes a photoconductive transmitting antenna, four plano-convex lenses and a photoconductive detecting antenna, the optical element is slidably connected to the guide rail through the corresponding fixed telescopic rod in the corresponding order, a terahertz spectrum free optical path is formed, each optical element realizes axial linear motion under the guidance of the guide rail, the motor controller is connected with the axial adjusting motor, the height adjusting motor and the angle adjusting motor respectively, and provides electric energy and sends a control signal, the upper computer is connected with the motor controller, the optical path adjusting control unit is terahertz time-domain spectroscopy control software installed in the upper computer, is used for controlling the switch of the terahertz time-domain spectrometer and displaying a terahertz signal in real time, obtaining terahertz time-domain pulse signal change, and the motor control unit is a motor control software installed in the automatic optical path adjusting device in the upper computer, and sends a motor motion instruction to the motor controller based on the received terahertz time-domain pulse signal change, that is, the optical path adjusting control unit is connected with the motor controller through the motor control unit and the motor controller.

2. The automatic optical path adjustment device for terahertz time-domain spectroscopy system according to claim 1, wherein, The fixed frame body is divided into a left fixed frame and a right fixed frame, the worm wheel is divided into a left half worm wheel and a right half worm wheel, the left half worm wheel is fixedly embedded in the left fixed frame, the right half worm wheel is embedded in the right fixed frame, the telescopic rod is arranged in the first through hole formed in the middle of the left fixed frame and the right fixed frame, and is fixed and locked through the locking frames on the left and right sides of the left fixed frame and the right fixed frame.

3. The automatic optical path adjustment device for terahertz time-domain spectroscopy system according to claim 2, wherein, The fixed frame further includes a worm fixing frame, the worm fixing frame is rotationally connected to the through hole penetrating the side surface of the right fixed frame, the other end of the worm is connected with the worm fixing frame, the worm fixing frame is driven to rotate, and the evenly distributed teeth on the outer side of the worm fixing frame are engaged with the outer teeth of the worm wheel.

4. The automatic optical path adjustment device for terahertz time-domain spectroscopy system according to claim 3, wherein, The adjusting method includes the following steps: (1) according to the fixed structure, each optical element in the terahertz free optical path is combined with the fixed telescopic rod and the fixed frame, and is placed on the guide rail to construct the terahertz free optical path, the fixed frame is connected with the electric adjusting table through the worm, the motor controller is connected with the electric adjusting table and connected to the upper computer; (2) The terahertz free optical path is connected to the terahertz time-domain spectrometer, and the instrument is started through the optical path adjustment control unit. The upper computer detects and displays the terahertz signal in real time. At this time, the movement sequence of each electrically adjustable platform corresponding to each optical element, the movement sequence, rotation speed, rotation accuracy, rotation direction, and rotation angle threshold of each adjusting motor in each electrically adjustable platform are set in the optical path adjustment control unit. The movement instruction is sent to the motor controller, and each adjusting motor will move in turn. During the adjustment process, the optical path adjustment control unit displays the adjustment signal in real time. Through the development and optimization of the algorithm and the learning of the algorithm, the real-time adjustment signal is compared, and the result is fed back to the motor control unit. If the signal is optimized, send the corresponding instruction to the automatic optical path adjustment device to continue moving in the predetermined direction and the set parameters within the threshold range. The optical elements in the optical path to be adjusted connected to the corresponding system move accordingly and feed back the real-time signal to the optical path adjustment control unit. After comparison, the result is fed back to the motor control unit. This cycle continues until the signal is optimal, and the movement stops. After fixing the adjusted optical elements in the terahertz free optical path, the automatic optical path adjustment device is removed.

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