CN106769993B - Sample tabletting bearing device, terahertz spectrum measuring system and measuring method - Google Patents
Sample tabletting bearing device, terahertz spectrum measuring system and measuring method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The invention relates to the technical field of terahertz spectrum measurement equipment, in particular to a sample tabletting bearing device, a terahertz spectrum measurement system and a measurement method. The sample tabletting bearing device comprises a tabletting fixing assembly, a driving assembly and a control assembly, wherein the tabletting fixing assembly is used for simultaneously fixing a plurality of sample tabletting, the control assembly is connected with the tabletting fixing assembly through the driving assembly, and the horizontal movement amount of the tabletting fixing assembly is driven through the rotation angular displacement of the driving assembly, so that the continuous measurement and automatic focusing accuracy of the sample tabletting are effectively improved, the accuracy of experimental effects is improved, the device is suitable for tabletting with different intensities and thin thickness, the sample tabletting is continuously measured in groups, the experimental efficiency can be effectively improved, and the nitrogen consumption can be greatly reduced when a terahertz spectrum measurement method is utilized for carrying out terahertz experiments; remote control can be realized by utilizing the control component, and the harm to human bodies caused by direct contact of experimenters with harmful samples is avoided.
Description
Technical Field
The invention relates to the technical field of terahertz spectrum measurement equipment, in particular to a sample tabletting bearing device, a terahertz spectrum measurement system and a measurement method.
Background
Terahertz radiation is between 0.1THz and 10THz (1 thz=10) 12 Hz) with a corresponding wavelength range of 30 nm-3 mm, belonging to the far infrared band, which is just in the transition region of electronics and photonics. Electromagnetic waves in this band are referred to in electronics as millimeter waves or sub-millimeter waves, and in spectroscopy as far infrared.
At present, the application of terahertz spectrum is increasingly wide, and people utilize terahertz spectrum technology to perform works such as agriculture, astronomy, colorimetry, environment detection, semiconductor industry, component detection and the like. Popularization of terahertz spectrum application is not separated from research of early-stage spectrum experiments, and research discovers that: the terahertz wave has the characteristic of strong absorption to moisture, is very sensitive, and is usually required to be removed by nitrogen in the experiment, so that the waste of the nitrogen is avoided, and therefore, the clamping area of the sample for the terahertz test is not suitable to be too large, and the structure is relatively simple; the sample box is taken out and the sample is not easy to be put into the sample too frequently.
In addition, terahertz can be absorbed by some high-risk substances, so that the terahertz can be used for carrying out some related experiments, and an experimenter can not influence the health of the body if contacting the terahertz for a long time, so that for the situation, a sample carrying device is required to realize remote control, and certain defects still exist on a sample tabletting carrying clamping device in the current terahertz spectrum experiment instrument, and improvement is required.
Generally, more single-clamping scalable sample tablet bearing devices are used in terahertz spectrum experiments, and the devices have the following defects although the devices are simple in structure and low in price:
(1) The clamping effect is not ideal, particularly, the thinner sample tablet is difficult to clamp, and in the use process, when the sample tablet strength is lower, the tablet is easy to break, and the measurement is influenced;
(2) The device can not continuously measure the tabletting of multiple samples, and has lower efficiency;
(3) The focusing process is basically realized by using human eyes, and the precision is low;
(4) Automatic control cannot be realized, and an experimenter is required to contact with the medicine for a long time.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problem of providing a sample tabletting bearing device, a terahertz spectrum measuring system and a measuring method, which are suitable for sample tabletting with different intensities and can realize continuous measurement and automatic focusing.
(II) technical scheme
In order to solve the technical problems, the invention provides a sample tabletting carrying device which comprises a tabletting fixing assembly, a driving assembly and a control assembly, wherein the tabletting fixing assembly is used for simultaneously fixing a plurality of sample tabletting, and the control assembly is connected with the tabletting fixing assembly through the driving assembly so as to drive the horizontal movement amount of the tabletting fixing assembly through controlling the rotation angular displacement of the driving assembly.
Further, the driving assembly comprises a stepping motor and a screw rod, and the control assembly is connected with the screw rod through the stepping motor so as to drive the screw rod to rotate; the pressing piece fixing assembly is sleeved outside the screw rod, the screw rod is driven to horizontally move along the screw rod by rotation of the screw rod, and a preset proportion is arranged between the angular displacement of the screw rod and the horizontal movement of the pressing piece fixing assembly along the screw rod.
Further, the stepping motor is simultaneously connected with at least two parallel screws, each screw is on the same horizontal plane, the pressing piece fixing assembly is simultaneously sleeved outside each screw, and the pressing piece fixing assembly is simultaneously driven to synchronously move horizontally along each screw through the rotation of each screw.
Further, the pressing piece fixing assembly comprises a moving block and a fixing frame, the fixing frame is fixed on the moving block, the moving block is sleeved outside the driving assembly, and the driving assembly drives the moving block to horizontally move through rotation; the fixing frame is provided with a plurality of fixing grooves for fixing the sample pressing sheet.
Further, the mount includes bottom plate and fixed plate, the bottom plate is fixed on the upper surface of movable block, fixed plate vertically fixes on the upper surface of bottom plate, the fixed plate is interior vertical be equipped with a plurality of fixed recess, and the side link up and be provided with a plurality of measurement mouths, each the measurement mouth corresponds the setting with each fixed recess respectively, be equipped with between bottom plate and the fixed plate and be used for adjusting sample preforming height's gasket.
Further, the device also comprises a laser positioning component, wherein the laser positioning component is fixedly arranged outside the pressing piece fixing component and is connected with the control component, the pressing piece fixing component horizontally moves relative to the laser positioning component, and the laser positioning component horizontally moves and positions the pressing piece fixing component.
Further, the laser positioning component comprises a laser transmitting end and a laser receiving end, and the laser receiving end is connected with the control component; the laser transmitting end and the laser receiving end are respectively and symmetrically arranged on two sides of the pressing piece fixing assembly in a fixed mode so as to form a laser beam between the laser transmitting end and the laser receiving end, and the pressing piece fixing assembly cuts the laser beam when moving horizontally; the tablet fixing assembly is provided with a light hole for allowing the laser beam to pass through.
Further, the control assembly comprises a microcomputer control end, and a virtual instrument graphical user interface for controlling the driving assembly to rotate is loaded on the microcomputer control end.
The invention also provides a terahertz spectrum measuring system which is characterized by comprising the sample tabletting carrying device.
The invention also provides a terahertz spectrum measuring method, which comprises the following steps:
s1, determining A sample pressing sheets to be detected as a group, and respectively fixing each sample pressing sheet to be detected in each fixing groove of a pressing sheet fixing assembly;
s2, focusing at least two steps on an a-th sample to be tested in the A sample tablets to be tested;
s3, measuring the a sample to be measured through terahertz measuring equipment;
and S4, returning to the step S2, and enabling a to be in a plus 1 state until a is in a plus 1 state, and ending the measurement.
(III) beneficial effects
The technical scheme of the invention has the following beneficial effects: the sample tabletting bearing device comprises a tabletting fixing component, a driving component and a control component, wherein the tabletting fixing component is used for fixing a plurality of sample tabletting at the same time, the control component is connected with the tabletting fixing component through the driving component so as to drive the horizontal movement amount of the tabletting fixing component through controlling the rotation angle displacement of the driving component, thereby effectively improving the precision of continuous measurement and automatic focusing of the sample tabletting, avoiding the influence caused by human factors because of observation, identification and adjustment focusing of experimenters, improving the accuracy of experimental effect, simultaneously, the device is suitable for the tabletting with different intensities and thin thickness, and can effectively improve the experimental efficiency, greatly reduce the nitrogen consumption and save the cost when the terahertz spectrum measurement method is used for carrying out terahertz experiments by using the system; in addition, the remote control can be realized by utilizing the control component, so that the harm to human bodies caused by direct contact of experimenters with harmful samples is avoided.
Drawings
FIG. 1 is a schematic view of a sample wafer carrier according to an embodiment of the present invention;
FIG. 2 is a top view of a sample wafer carrier (without control assembly) according to an embodiment of the present invention;
FIG. 3 is a front view of a holder according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a signal diagram received by the control assembly when the device of the embodiment of the invention utilizes the laser positioning assembly to perform coarse focusing;
fig. 6 is a signal diagram received by the control component when the device of the embodiment of the invention utilizes the laser positioning component to perform micro-focusing.
Wherein, 1, a support; 2. a slide bar; 3. a screw rod; 4. a moving block; 5. a gasket; 6. a stepping motor; 7. a microcomputer control end; 8. a fixing frame; 9. a mounting hole; 10. a fixing groove; 11. a measuring port; 12. a bottom plate; 13. a fixing plate; 14. a laser receiving end; 15. a laser emitting end; 16. a laser fixing frame; 17. light holes.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. The terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the sample press plate bearing device provided in this embodiment includes a press plate fixing assembly, a driving assembly and a control assembly, where the press plate fixing assembly is used to fix a plurality of sample press plates at the same time, and the whole set of sample press plates is fixed by using the self gravity of the sample press plates and the counter-supporting force of the press plate fixing assembly, so as to realize continuous measurement of the plurality of sample press plates; the control assembly is connected with the tablet fixing assembly through the driving assembly, so that the horizontal movement amount of the tablet fixing assembly is driven through controlling the rotation angular displacement of the driving assembly, the precision of continuous measurement and automatic focusing of the sample tablet is effectively improved, the experimenter is not required to observe, recognize, adjust and focus, the influence caused by human factors is avoided, the accuracy of experimental effect is improved, meanwhile, the device is suitable for tablet pressing with different intensity and thickness, the sample tablet pressing is continuously measured in groups, the experimental efficiency can be effectively improved, and especially in terahertz experiments, the nitrogen consumption can be greatly reduced, and the cost is saved; in addition, the remote control can be realized by utilizing the control component, so that the harm to human bodies caused by direct contact of experimenters with harmful samples is avoided.
As shown in fig. 2, the driving assembly of the embodiment preferably includes a stepper motor 6 and a screw 3, the control assembly is connected with the screw 3 through the stepper motor 6 to drive the screw 3 to rotate, the tablet fixing assembly is sleeved outside the screw 3 and is driven to move horizontally along the screw 3 by the rotation of the screw 3, the control assembly is utilized to convert electric pulse into angular displacement through the stepper motor 6 to drive the screw 3 to rotate, so that the rotation quantity is converted into the horizontal movement quantity of the tablet fixing assembly proportionally by utilizing the ball screw 3 revolute pair, and further, precise automatic focusing is realized, and because the preset proportion is provided between the angular displacement quantity of the rotation of the screw 3 and the horizontal movement quantity of the tablet fixing assembly along the screw 3, the automatic focusing accuracy can be effectively improved, the experimental data accuracy is further improved, and the experimental effect is improved.
In order to further ensure the translation stability of the tablet fixing assembly, preferably, the stepping motor 6 is simultaneously connected with at least two parallel screw rods 3, each screw rod 3 is positioned on the same horizontal plane, the tablet fixing assembly is simultaneously sleeved outside each screw rod 3, and the tablet fixing assembly is simultaneously driven to synchronously move horizontally along each screw rod 3 through the simultaneous rotation of each screw rod 3.
As shown in fig. 3 and 4, the tablet fixing assembly of the embodiment includes a moving block 4 and a fixing frame 8, the fixing frame 8 is fixed on the moving block 4, the moving block 4 is sleeved outside a driving assembly, and the driving assembly drives the moving block 4 to horizontally move through rotation; the fixing frame 8 is provided with a plurality of fixing grooves 10 for fixing the sample pressing sheet.
Preferably, the fixing frame 8 comprises a bottom plate 12 and a fixing plate 13, the bottom plate 12 is fixed on the upper surface of the moving block 4, the fixing plate 13 is vertically fixed on the upper surface of the bottom plate 12, a plurality of fixing grooves 10 are vertically arranged in the fixing plate 13, a plurality of measuring ports 11 are respectively arranged on the side surfaces of the fixing grooves 10 in a penetrating way, each measuring port 11 is respectively arranged corresponding to each fixing groove 10, when a sample tablet is vertically inserted into the fixing groove 10, the sample tablet is vertically fixed in the fixing groove 10 by utilizing the combined action of the gravity of the sample tablet and the counter-supporting force of the fixing groove 10, and the sample position with observation can be correspondingly positioned in the measuring port 11 so as to automatically focus and measure the sample, and meanwhile, the clamping stability during tablet measurement is improved, so that the device can be used for carrying tablets with different intensities and different thicknesses without damaging the tablet itself; in addition, because the fixed plate 13 is internally provided with a plurality of fixed grooves 10, a plurality of sample pressing sheets can be borne at a time, and the instrument is utilized to focus and measure the plurality of sample pressing sheets of the group at the same time, so that continuous measurement is realized, the experimental efficiency is improved, and especially in terahertz experiments, nitrogen consumption can be greatly reduced and cost is saved because the sample pressing sheets are required to be input before each measurement.
When the sample position in the sample pressing sheet and the measuring port 11 cannot be well correspondingly arranged, preferably, a gasket 5 for adjusting the height of the sample pressing sheet is arranged between the bottom plate 12 and the fixed plate 13, in order to facilitate the adjustment of the pressing sheet positions, the number of the gaskets 5 is multiple, the thicknesses are different, and the sample position in the sample pressing sheet is adjusted through the height of the gasket 5 so as to be accurately aligned in the measuring port 11; in addition, in order to secure a reliable connection between the bottom plate 12 and the moving block 4, it is preferable that a plurality of mounting holes 9 are uniformly provided on the bottom plate 12, and bolts are passed through the mounting holes 9 to fix the bottom plate 12 of the fixing frame 8 on the upper surface of the moving block 4 while fixing the shims 5 of different thicknesses between the moving block 4 and the fixing frame 8.
The control component of this embodiment includes a microcomputer control terminal 7, preferably a PC, and a virtual instrument graphical user interface (hereinafter referred to as GUI) for controlling rotation of the driving component is loaded on the microcomputer control terminal 7. In this embodiment, the program development environment loaded on the microcomputer control terminal 7 is preferably LabVIEW, labVIEW, which is developed by national instruments corporation (NI corporation for short), similar to the C and BASIC development environments, but the significant differences between LabVIEW and other computer languages are: other computer languages adopt a text-based language to generate codes, while LabVIEW adopts a graphic editing language G to write programs, and the generated programs are in the form of block diagrams; in the Labview environment, a virtual instrument graphical programming GUI is adopted in cooperation with a motion control card of an NI company, and an electric pulse is converted into angular displacement of a stepping motor 6 through a microcomputer control end 7, so that the rotation amount of a screw rod 3 is accurately controlled, and the rotation amount of the screw rod 3 is further proportionally converted into the translation amount of a moving block 4, so that accurate automatic focusing is realized; preferably, when the microcomputer control end 7 of the embodiment controls the stepper motor 6 through the GUI, wired connection may be adopted, or remote wireless control may be adopted, the microcomputer control end 7 is used as an upper computer, the GUI is used as an operation interface, and a measurement experiment process of a remote accurate control system may be implemented, so that direct contact between a harmful sample tablet and a human body is avoided, and harm is caused to the human body.
The device of this embodiment still includes support 1 and sliding bar, and drive assembly and sliding bar are fixed respectively on support 1, and the sliding bar wears to locate in the preforming fixed subassembly, and with the horizontal migration direction parallel arrangement of preforming fixed subassembly.
Specifically, two lead screws 3 are fixed in parallel between two ends of the support 1 in the embodiment, the axes of the two lead screws 3 are arranged on the same horizontal plane, and the same ends of the two lead screws 3 are simultaneously connected with a stepping motor 6 so as to be driven by the stepping motor 6 to synchronously rotate; the bottom both sides of movable block 4 overlap respectively outside two lead screws 3, and be provided with draw runner 2 in the middle of two lead screws 3, draw runner 2 passes in the movable block 4 bottom to guarantee that movable block 4 is more stable when sliding, draw runner 2's both ends are fixed in support 1 both ends respectively, and when step motor 6 synchronous drive two lead screws 3 rotated, stable horizontal migration under the synchronous rotation drive of two lead screws 3 of movable block 4, have the ratio of predetermineeing between the angular displacement of lead screw 3 pivoted and the horizontal movement of movable block 4, in order to ensure the accuracy nature of autofocus.
The upper surface of the movable block 4 is fixed with a fixed frame 8 through six bolts, wherein six mounting holes 9 are respectively arranged on a bottom plate 12 of the fixed frame 8, a fixed plate 13 is vertically arranged on the horizontal axis position of the fixed frame, and three mounting holes 9 are symmetrically arranged on two sides of the fixed plate 13 respectively, so that the bottom plate 12 is reliably fixed on the upper surface of the movable block 4 through the bolts; a plurality of gaskets 5 with different thicknesses are also arranged between the bottom plate 12 and the movable block 4; three fixing grooves 10 are vertically arranged on the fixing plate 13, and a circular measuring port 11 is respectively and penetratingly arranged on two sides of each fixing groove 10 so as to facilitate measurement of a pressed sample; the measuring port 11 may also be square, polygonal or other shape.
It should be noted that, the number of the mounting holes 9 in the present embodiment may be three, or may be plural, and preferably, the plurality of mounting holes 9 are symmetrically disposed on two sides of the fixing plate 13, so as to ensure stability of the fixing frame 8; the number of the fixing grooves 10 in this embodiment may be three, or may be two or more, and the specific number may be set according to the size of the moving block 4 and the size of the tablet sample.
In order to more accurately position the horizontal movement position and the horizontal movement amount of the pressing piece fixing component, the device further comprises a laser positioning component, the laser positioning component is fixedly arranged outside the pressing piece fixing component and is connected with the control component, the pressing piece fixing component horizontally moves relative to the laser positioning component, and the laser positioning component horizontally moves and positions the pressing piece fixing component.
Specifically, the laser positioning assembly of the embodiment includes a laser transmitting end 15 and a laser receiving end 14, and the laser receiving end 14 is connected with the control assembly; the laser transmitting end 15 and the laser receiving end 14 are respectively and symmetrically and fixedly arranged at two sides of the tabletting fixing assembly, and a laser beam is formed between the laser transmitting end 15 and the laser receiving end 14, the tabletting fixing assembly cuts the laser beam when moving horizontally, and when the laser beam is cut, the laser receiving end 14 can not receive the laser beam, so that the position of the tabletting fixing assembly can be fed back to the control assembly; the light hole 17 for the laser beam to pass through is arranged on the pressing sheet fixing assembly, and when the pressing sheet fixing assembly moves to cut the laser beam, the position of the pressing sheet fixing assembly is judged by the laser beam passing through the light hole 17. The laser emitting end 15 and the laser receiving end 14 are preferably fixed on both sides of the support 1 through the laser fixing frame 16, respectively, and in addition, in order to avoid the influence of the laser fixing frame 16 on the terahertz measurement apparatus to accurately measure the pressed sample through the measurement port 11, the height of the laser fixing frame 16 is preferably not higher than the lowest point of the measurement port 11.
Preferably, a plurality of light holes 17 are formed in the fixing frame 8 of the tablet fixing assembly, the number of the light holes 17 is corresponding to the number of the measuring ports 11, and terahertz measuring equipment in the terahertz measuring system is corresponding to the position of the laser beam, so that when the laser beam penetrates through any light hole 17, the measuring angle of the terahertz measuring equipment and the position of the measuring port are ensured to be accurately focused.
Specifically, in this embodiment, it is preferable that a plurality of elongated slits are formed at the lower end of the fixing frame 8, so as to serve as a plurality of light holes 17, and each elongated slit is vertically disposed below the measuring port and is guaranteed to be perpendicular to the axis of the measuring port; the moving distance of the moving block 4 is automatically controlled by the stepping motor 6, an automatic focusing function is realized with the assistance of the laser transmitting end 15 and the laser receiving end 14, and the experimental precision is improved; the stepping angle of the stepping motor 6 of the present embodiment is 1.5 °, the basic lead of the ball screw 3 is 4mm, and the speed of each stage of the stepping motor is determined by the pulse interval of the data resetting section of the GUI, so that the stroke of the moving block 4 can be controlled by the start, pause, right-shift, left-shift, and fine-shift buttons on the GUI.
In the control component of the embodiment, a GUI is loaded on a PC as a microcomputer control end 7, and the GUI is used to connect with a stepper motor 6 to remotely control the feeding amount of the stepper motor 6, so as to control the rotational angular displacement of the screw rod 3, and the GUI can calculate accurate automatic focusing data by inputting various parameters of a measurement experiment, and further accurately control the horizontal movement amount of the moving block 4 by controlling the rotational angular displacement of the screw rod 3, so as to realize more accurate automatic focusing.
The embodiment also provides a terahertz spectrum measurement system, which comprises the sample tabletting carrying device. When the system is used for measuring the sample tabletting, firstly, the prepared whole group of three sample tabletting is vertically inserted into the three fixing grooves 10 of the fixing frame 8 respectively to fix the sample tabletting, then the glass cover is used for covering the device of the embodiment, and nitrogen is introduced into the glass cover to eliminate the interference of water vapor in the air; in the focusing process, a GUI control program is firstly clicked and started, left shift or right shift is selected to finish coarse focusing according to the current position, when a pulse signal formed by a laser beam is received by a laser positioning component for the first time, a stepping motor 6 stops, a fine tuning button is clicked at the moment, and micro focusing is performed under the assistance of the fine tuning control program; then, a terahertz measurement device in the system is started to measure the sample pressing sheets, and after one sample pressing sheet is measured, a GUI interface can be clicked to control a stepping motor 6 to move, so that a moving block 4 horizontally moves to drive a second sample pressing sheet to be at a measurement position and complete automatic focusing, thereby realizing continuous measurement; and after the whole group of sample tablets are measured successively, taking out the measured sample tablets, putting the next group of sample tablets into the fixing groove 10 again, and repeating the process until all the sample tablets are measured, thus completing the experiment.
The embodiment also provides a terahertz measurement method, which comprises the following steps:
s1, determining A sample pressing sheets to be detected as a group, and respectively fixing each sample pressing sheet to be detected in each fixing groove of a pressing sheet fixing assembly;
s2, focusing at least two steps on an a-th sample to be tested in the A sample tablets to be tested;
s3, measuring the a sample to be measured through terahertz measuring equipment;
and S4, repeating the steps S2 to S3 until the measurement is finished when the a=a+1.
Wherein, the step S2 further includes:
s201, controlling a stepping motor to start through a control assembly, and driving a moving block of the tabletting fixing assembly to move from one end to the other end at a second speed;
s202, when the moving block drives the sample tablet a to pass through a control stop position, the control assembly receives a first signal fed back by the laser positioning assembly;
s203, according to the first signal, the control component controls the stepping motor to stop, so that the moving block drives the sample a to stop at an actual stop position, and at the moment, the control component receives a second signal fed back by the laser positioning component;
s204, according to the second signal, the control component controls the stepping motor to start, drives the moving block to repeatedly move back and forth at a third speed according to the stroke quantity of the equal ratio array, and when the moving block drives the a sample tablet to move to the fine adjustment control stop position, the control component receives a third signal fed back by the laser positioning component;
and S205, according to the third signal, the control component controls the stepping motor to stop so as to lead the final position of the moving block to approach the target position infinitely.
Specifically, taking a=3 as an example, that is, taking 3 to-be-measured sample tablets as a group, firstly focusing at least two steps on the 1 st to-be-measured sample, then measuring the 1 st to-be-measured sample through terahertz measuring equipment, and then focusing and measuring the 2 nd and 3 rd sequences until a=a=3, that is, after all the 3 to-be-measured sample tablets are measured, measuring is finished, thereby realizing the effect of continuous measurement of the system.
In step S2, when the tablet fixing assembly is not moved to the measurement position, the laser receiving end 15 does not receive a signal due to the shielding of the fixing frame 8, that is, the received signal is 0; when the light hole 17 of the fixing frame 8 moves to the centers of the laser transmitting end 14 and the laser receiving end 15, namely, when the laser beam passes through the light hole 17, the laser receiving end 15 receives a pulse with a signal of 1, so that the signal is fed back to a PC of the control assembly, the current position of the tablet fixing assembly is judged by the signal, and the stepping motor is controlled according to the position of the tablet fixing assembly, so that the accurate automatic focusing work of the system is completed on the basis of continuous measurement.
Further, as shown in fig. 5 and 6, in fig. 5, the position of the tablet fixing member at time t0 is the target position, the position of the tablet fixing member at time t1 is the rough adjustment control stop position, the actual stop position of the tablet fixing member at time t2 is the fine adjustment control stop position, and the position of the tablet fixing member at time t3 is the rough adjustment control stop position.
In the above steps S201 to S205, taking the example that the tablet fixing assembly moves leftwards, the whole automatic focusing process can be preferably divided into two steps of coarse focusing and micro focusing, specifically as follows:
first, coarse focusing: as shown in fig. 5, firstly, the built-in program of the microcomputer control end controls the stepping motor 6 to drive the moving block 4 to rapidly move rightward at a first larger speed V1 from the left end until the laser beam approaches the light transmission hole 17 at the lower end of the measuring port where the tablet to be measured is located, and then moves slowly at a second speed V2, wherein V1 is greater than V2; when the microcomputer control end 7 receives the pulse signal 1 for the first time, i.e. the first signal, the stepping motor 6 is controlled to stop, and since the microcomputer control end 7 inputs the stop signal to the stepping motor 6 at the time t1, the rotation speed of the stepping motor is larger, i.e. the speed V2 of the moving block 4 still has a larger speed, the moving block 4 is easy to deviate from the position due to the signal delay or inertia action, so that the moving block 4 stops at the actual stop position where the time t2 is located, and the laser beam cannot pass through the light hole 17 at this time, so that the signal pulse is 0 again, i.e. the second signal, so that the deviation between the position of the moving block 4 and the target position is larger.
Second step, micro focusing: recording the actual stop position and the second signal content by using a built-in program of the microcomputer control end 7, then controlling the stepping motor to slowly rotate according to the second signal, under the control of program calculation, moving the moving block 4 leftwards by n strokes at a third speed V3, rightwards by 2n strokes, leftwards by 3n strokes, rightwards by 4n strokes, and leftwards and rightwards by using a rule of continuously increasing the strokes according to an equal ratio sequence until a pulse signal is changed from 0 to 1, namely, controlling the stepping motor 6 to stop rotating when the control assembly receives the third signal from the laser positioning assembly, so that the position of the moving block 4 approaches to the target position infinitely; among them, V3< < V2< V1 is preferable in order to ensure accuracy of micro focusing.
In summary, the sample tabletting carrying device of the embodiment includes the tabletting fixing assembly, the driving assembly and the control assembly, the tabletting fixing assembly is used for fixing a plurality of sample tabletting simultaneously, the control assembly is connected with the tabletting fixing assembly through the driving assembly, so as to drive the horizontal movement amount of the tabletting fixing assembly through controlling the rotation angle displacement of the driving assembly, thereby effectively improving the precision of continuous measurement and automatic focusing of the sample tabletting, avoiding the influence caused by human factors, improving the accuracy of experimental effect, meanwhile, the device is suitable for the tabletting with different intensity and thin thickness, and the sample tabletting is continuously measured in groups, so that the experimental efficiency can be effectively improved, especially in terahertz experiments, the nitrogen consumption can be greatly reduced, and the cost is saved; in addition, the remote control can be realized by utilizing the control component, so that the harm to human bodies caused by direct contact of experimenters with harmful samples is avoided.
The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (7)
1. The sample pressing piece bearing device is characterized by comprising a pressing piece fixing assembly, a driving assembly and a control assembly, wherein the pressing piece fixing assembly is used for simultaneously fixing a plurality of sample pressing pieces, and the control assembly is connected with the pressing piece fixing assembly through the driving assembly so as to drive the horizontal movement amount of the pressing piece fixing assembly through controlling the rotation angular displacement of the driving assembly;
the tablet fixing assembly comprises a moving block and a fixing frame, the fixing frame is fixed on the moving block, the moving block is sleeved outside the driving assembly, and the driving assembly drives the moving block to horizontally move through rotation; the fixing frame is provided with a plurality of fixing grooves for fixing the sample pressing sheet; the fixing frame comprises a bottom plate and a fixing plate, the bottom plate is fixed on the upper surface of the moving block, the fixing plate is vertically fixed on the upper surface of the bottom plate, a plurality of fixing grooves are vertically arranged in the fixing plate, a plurality of measuring ports are arranged in a penetrating manner on the side face of the fixing plate, and each measuring port is respectively arranged corresponding to each fixing groove; a gasket for adjusting the height of the sample pressing sheet is arranged between the bottom plate and the fixed plate;
the control assembly comprises a microcomputer control end, the driving assembly comprises a stepping motor and a screw rod, and the control assembly is connected with the screw rod through the stepping motor so as to drive the screw rod to rotate; the pressing piece fixing assembly is sleeved outside the screw rod, and is driven by the rotation of the screw rod to horizontally move along the screw rod, and a preset proportion is arranged between the rotational angular displacement of the screw rod and the horizontal movement amount of the pressing piece fixing assembly along the screw rod;
the whole automatic focusing process is divided into coarse focusing and micro focusing; in the course of coarse focusing, the built-in program of the microcomputer control end controls the stepping motor to drive the moving block to rapidly move rightward at a first speed from the left end until the laser beam approaches a light hole at the lower end of a measuring port where a tablet to be measured is positioned, and moves at a second speed, wherein V3< < V2< V1; when the microcomputer control end receives the first signal for the first time, the stepping motor is controlled to stop; the moving block stops at an actual stop position at the time t2, and the laser beam cannot pass through the light hole, so that the signal pulse is a second signal again; in the micro-focusing process, the built-in program of the microcomputer control end records the actual stop position and the second signal content, the stepping motor is controlled to rotate according to the second signal, the moving block moves leftwards by n strokes at a third speed V3, then moves rightwards by 2n strokes, moves leftwards by 3n strokes, then moves rightwards by 4n strokes, and moves leftwards and rightwards by utilizing the rule of continuously increasing the strokes according to an equal ratio sequence until the pulse signal is a third signal.
2. The device according to claim 1, wherein the stepper motor is simultaneously connected with at least two parallel screws, each screw is on the same horizontal plane, the tablet fixing assembly is simultaneously sleeved outside each screw, and the tablet fixing assembly is simultaneously driven to synchronously move horizontally along each screw by simultaneously rotating each screw.
3. The apparatus of any of claims 1-2, further comprising a laser positioning assembly fixedly disposed outside of the tablet securing assembly and coupled to the control assembly, the tablet securing assembly being horizontally movable relative to the laser positioning assembly for positioning the horizontal movement of the tablet securing assembly by the laser positioning assembly.
4. The apparatus of claim 3, wherein the laser positioning assembly comprises a laser emitting end and a laser receiving end, the laser receiving end being connected to the control assembly; the laser transmitting end and the laser receiving end are respectively and symmetrically arranged on two sides of the pressing piece fixing assembly in a fixed mode so as to form a laser beam between the laser transmitting end and the laser receiving end, and the pressing piece fixing assembly cuts the laser beam when moving horizontally; the tablet fixing assembly is provided with a light hole for allowing the laser beam to pass through.
5. The device according to any one of claims 1-2, wherein the microcomputer control terminal is loaded with a virtual instrument graphical user interface for controlling the rotation of the drive assembly.
6. A terahertz spectrum measurement system, comprising a sample wafer carrier according to any one of claims 1-5.
7. A terahertz spectroscopic measurement method using the sample wafer carrier according to any one of claims 1 to 5, characterized by comprising the steps of:
s1, determining A sample pressing sheets to be detected as a group, and respectively fixing each sample pressing sheet to be detected in each fixing groove of a pressing sheet fixing assembly;
s2, focusing at least two steps on an a-th sample to be tested in the A sample tablets to be tested;
s3, measuring the a sample to be measured through terahertz measuring equipment;
and S4, returning to the step S2, and enabling a to be in a plus 1 state until a is in a plus 1 state, and ending the measurement.
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