CN218865093U - Micro-droplet air attitude real-time capturing device - Google Patents
Micro-droplet air attitude real-time capturing device Download PDFInfo
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- CN218865093U CN218865093U CN202221170708.8U CN202221170708U CN218865093U CN 218865093 U CN218865093 U CN 218865093U CN 202221170708 U CN202221170708 U CN 202221170708U CN 218865093 U CN218865093 U CN 218865093U
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Abstract
The problem that the scheme was caught to camera performance demand height for solving the aerial gesture of current micro-droplet, the real-time nature does not possess to the acquisition result, the utility model provides a real-time seizure of the aerial gesture of micro-droplet and analytical equipment. The real-time capturing device comprises a device driving control system, a mechanical motion structure and an imaging system; the device driving control system is used for controlling the mechanical motion structure, the imaging system and the micro-droplet generator to move; the mechanical motion structure is used for realizing the installation and fixation of the micro-droplet generator and the imaging system and the position adjustment of the micro-droplet generator and the imaging system; the imaging system comprises a micro-droplet capturing light source, an image acquisition unit and at least one optical imaging lens; the micro-droplet capturing light source is used for simulating the triggering of the image acquisition unit to the required light source; the image acquisition unit is used for realizing image acquisition; the optical imaging lens is used for zooming the image. The microsecond-level accurate control of the micro-droplet capturing light source realizes that the common camera can complete the function of capturing the droplet form.
Description
Technical Field
The utility model relates to a real-time trapping apparatus of micro-droplet attitude in air.
Background
In the process of droplet ejection 3D printing and forming, a droplet is formed in a drop-on-demand ejection mode, the surface quality of a product is influenced by aspects such as droplet shapes, droplet tracks and droplet speeds, and the requirements for capturing and analyzing the aerial attitude of droplets are increasing day by day. At present, in the process of droplet jetting 3D printing and forming, the aerial form capture of a droplet forming material is mainly focused by adopting a lens automatic focusing or manual focusing mode, when transparent solvent droplets are captured, the liquid droplets and a background boundary are not clear frequently, so that the subsequent analysis work cannot be accurately and effectively carried out, a camera shutter is controlled to adopt a high-speed camera electronic shutter to realize the quick opening and closing of a photosensitive element, and clear and available images are screened after a plurality of images are collected for subsequent processing.
SUMMERY OF THE UTILITY MODEL
In order to solve the aerial gesture of current micro-droplet and catch the scheme and to camera performance demand height, the technical problem of real-time nature is not possessed to the acquisition result, the utility model provides an aerial gesture of micro-droplet is caught and analytical equipment in real time.
The technical scheme of the utility model is that:
a micro-droplet air attitude real-time capturing device is disclosed, wherein the micro-droplet is generated by a micro-droplet generator; it is characterized in that: the device comprises a device driving control system, a mechanical motion structure and an imaging system;
the device driving control system is used for controlling the mechanical motion structure, the imaging system and the micro-droplet generator to move and collecting droplet images;
the mechanical motion structure is used for realizing the installation and fixation of the micro-droplet generator and the imaging system and the position adjustment of the micro-droplet generator and the imaging system;
the imaging system is arranged above the mechanical motion structure and comprises a micro-droplet capturing light source, an image acquisition unit and at least one optical imaging lens; the micro-droplet capturing light source is used for simulating the triggering of the image acquisition unit to the required light source; the image acquisition unit is used for realizing image acquisition; the optical imaging lens is used for zooming the image.
Furthermore, the mechanical motion structure comprises a mounting substrate, a focusing motor, a guide mechanism, a transmission mechanism, a motion platform, a vertical plate, a horizontal fine adjustment mechanism, a vertical fine adjustment mechanism, a micro-droplet generator clamping mechanism and a light shield;
the focusing motor is arranged above the mounting substrate and used for adjusting the object distance between the imaging system and the observed micro-droplets to realize clear imaging;
the guide mechanism is arranged above the mounting substrate along the direction of the motor shaft and is mechanically connected with the mounting substrate, and is used for restricting the degree of freedom of the motion platform and enabling the motion platform to only have a single degree of freedom moving along the axis of the guide mechanism;
the transmission mechanism is rigidly connected with the focusing motor and used for pushing the motion platform;
the vertical plate is arranged above the mounting substrate and positioned on one side of the guide mechanism, an observation hole is formed in the middle of the vertical plate, and the imaging system observes the shape of the target through the observation hole;
the horizontal fine adjustment mechanism is arranged on the vertical plate, the vertical fine adjustment mechanism is arranged on the horizontal fine adjustment mechanism, the micro-droplet clamping framework is arranged on the vertical fine adjustment mechanism, and the three mechanisms jointly realize the position adjustment of the micro-droplet generator;
the light shield is used for isolating external ambient light to meet the dark room requirement of the imaging system.
Further, the imaging system comprises an image acquisition unit, a first optical imaging lens, a second optical imaging lens and a micro-droplet capturing light source;
the image acquisition unit is arranged on the motion platform, is coaxial with the observation hole and is used for converting the acquired image into an information format which can be identified and processed by the device driving control system;
the second optical imaging lens is used for optically zooming the imaging size of the micro-droplet;
the first optical imaging lens is used for secondarily zooming the image size and adjusting the imaging distance of the optical image projected to the image acquisition unit;
the micro-droplet capturing light source is arranged above the mounting substrate and is coaxial with the observation hole, and is used for simulating the light source required by triggering of the image acquisition unit.
Furthermore, a foot margin or a damping vibration isolation fixer is arranged below the mounting substrate.
Further, the mechanical movement structure further comprises a locking device for locking the micro-droplet generator.
Furthermore, the locking device is a long rod structure with an external thread structure;
and two sides of the bottom end of the micro-droplet generator clamping mechanism are provided with threaded mounting holes, and the locking device is matched and connected with the threaded mounting holes and locked through rotation.
Further, the device driving control system includes a device driving controller and a computer; the device driving controller is electrically connected with the mechanical motion structure, the imaging system and the micro-droplet generator; the computer is electrically connected with the device driving controller, and controls the mechanical motion structure, the imaging system and the micro-droplet generator to move and collect droplet images through the device driving controller.
The utility model provides a little liquid drop gesture is caught and analytical equipment in real time in air which characterized in that: the device comprises an image processing unit and the micro-droplet air attitude real-time capturing device; the image processing unit is used for processing the micro-droplet image captured by the micro-droplet air attitude real-time capturing device, acquiring the flight track of the micro-droplets and predicting the drop points of the droplets.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses a to the microsecond level accurate control of micro-droplet catching light source, realized that ordinary camera can accomplish the function that the liquid droplet form was caught, reduced the requirement to the camera performance.
2. The utility model discloses but the micro-droplet gesture of real-time observation is less than 1 microsecond's accurate control through the lag time error, realizes that single micro-droplet control location catches the observation.
3. The utility model discloses a micro-droplet catches light source lag time developments continuous adjustment, can acquire multislot period liquid drop image, based on the multislot period liquid drop image that acquires, adopts current method to calculate just can acquire liquid drop diameter, volume, flight path curve, flight speed variation curve isoparametric to the image pixel, realizes realizing micro-droplet size on-line measuring, and the gesture is caught in real time.
4. The utility model discloses a real-time micro-droplet image that trapping apparatus obtained is through catching the accurate regulation and control of light source microsecond level and obtaining to the micro-droplet, has the contact between audio-visual displacement and the time, therefore based on the utility model discloses the micro-droplet image that catches carries out micro-droplet flight orbit and acquires, can simplify required hysteresis compensation algorithm, improves the operating efficiency to effectively improve relevant kinematics parameter calculation accuracy such as liquid drop speed, acceleration, motion orbit.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a flow chart of the working process of capturing the air attitude of the micro-droplets in real time by using the present invention.
Fig. 3 is a schematic diagram of a predicted final drop point of a multi-period microdroplet provided by the present embodiment.
Fig. 4 is a schematic view of single-droplet pixelation provided in this embodiment.
The reference numbers in the figures illustrate:
1. the device comprises a device driving controller, 2, a mounting substrate, 3, a focusing motor, 4, a guide mechanism, 5, a transmission mechanism, 6, an image acquisition unit, 7, a first optical imaging lens, 8, a motion platform, 9, a second optical imaging lens, 10, a vertical plate, 11, a horizontal fine adjustment mechanism, 12, a vertical fine adjustment mechanism, 13, a light shield, 14, a micro-droplet generator, 15, a locking device, 16, a micro-droplet generator clamping mechanism, 17, a micro-droplet capturing light source, 18, a first trigger time droplet, 19, a second trigger time droplet, 20, a third trigger time droplet, 21, a fourth trigger time droplet, 22, a predicted final droplet landing point, 23, a micro-droplet generator, 24, a micro-droplet generator nozzle, 25, a single micro-droplet, 26, a pixelated micro-droplet, 27, a computer, 28, a circular observation hole and 29, a flying droplet trajectory.
Detailed Description
The following examples are provided to explain the present invention in further detail.
The micro-droplets, which are the objects captured by the present invention, are generated by a micro-droplet generator, which is an existing device, for example, but not limited to the micro-droplet generator disclosed in CN 214472019U. The setting parameters comprise the trigger frequency of the micro-droplet generation device, the trigger delay time of a micro-droplet capturing light source, the optical magnification, the electronic magnification and the like. The generation of the trigger signal of the micro-droplet generation device can be realized by a programmable singlechip such as an FPGA, an embedded singlechip and the like.
As shown in fig. 1, the device for capturing and analyzing micro-droplet in air posture in real time of the present invention comprises a device driving control system, a mechanical motion structure and an imaging system.
The device drive control system includes a device drive controller 1 and a computer 27; the device driving controller 1 is electrically connected with the mechanical motion structure, the imaging system and the micro-droplet generator; the computer 27 is electrically connected with the device driving controller 1, and controls the mechanical motion structure, the imaging system and the micro-droplet generator to move and collect droplet images through the device driving controller 1.
The mechanical motion structure comprises a mounting substrate 2, a focusing motor 3, a guide mechanism 4, a transmission mechanism 5, a motion platform 8, a vertical plate 10, a horizontal fine adjustment mechanism 11, a vertical fine adjustment mechanism 12, a light shield 13, a locking device 15 and a micro-droplet generator clamping mechanism 16, and a foot margin or a damping vibration isolation fixer can be selectively mounted below the mounting substrate 2 according to actual needs; the focusing motor 3 is arranged above the mounting substrate 2, and a motor shaft of the focusing motor 3 can freely rotate around the axis of the focusing motor 3 and is used for adjusting the object distance between the imaging system and the observed micro-droplets so as to realize clear imaging; the guide mechanism 4 is arranged above the mounting base plate 2 along the direction of the motor shaft, is positioned on the left side of the focusing motor 3 in parallel, is mechanically connected with the mounting base plate 2, and is used for restricting the degree of freedom of the motion platform 8 and ensuring that the motion platform 8 only has a single degree of freedom moving along the axis of the guide mechanism 4; the force applying direction of the transmission mechanism 5 is parallel to that of the guide mechanism 4, is rigidly connected with the focusing motor 3, and rotates along with the motor shaft of the focusing motor 3 at the same speed and in the same direction to push the moving platform 8; the motion platform 8 is arranged above the guide mechanism 4 and the transmission mechanism 5 and can horizontally move along the axial direction of the guide mechanism 4 under the action of the transmission mechanism 5; the vertical plate 10 is arranged above the mounting base plate 2 and positioned on the left side of the guide mechanism 4, a circular observation hole 28 is formed in the middle area of the vertical plate 10, and the imaging system observes the form of a target through the circular observation hole 28; the long edge of the horizontal fine adjustment mechanism 11 is arranged on the left side of the vertical plate 10 along the front and back directions and is positioned above the circular observation hole 28; the long edge of the vertical fine adjustment mechanism 12 is arranged on the left side of the horizontal fine adjustment mechanism 11 in the vertical direction, and can reciprocate along the long edge direction of the horizontal fine adjustment mechanism 11 under the action of a driving device; the light shield 13 is a light-proof or semi-light-permeable shield, is arranged on the left side of the vertical plate 10, and is used for completely wrapping the micro-droplet generator 14, the vertical plate 10 and the like and isolating external ambient light to meet the requirement of a darkroom required by an imaging system; the micro-droplet generator clamping mechanism 16 is arranged on the left side of the vertical fine adjustment mechanism 12 and can reciprocate along the long side direction of the vertical fine adjustment mechanism 12 under the action of a driving device; two sides of the bottom end of the micro-droplet generator clamping mechanism 16 are provided with threaded mounting holes, the locking device 15 is of a long rod structure with an external thread structure and is matched and connected with two threaded mounting holes arranged below the micro-droplet generator clamping mechanism 16, locking and releasing are achieved through rotation, and the micro-droplet generator 14 is clamped through matching with the micro-droplet generator clamping mechanism 16. The horizontal fine adjustment mechanism 11 and the vertical fine adjustment mechanism 12 are provided with an electric control driving device, and fine displacement adjustment can be realized through electric control.
The imaging system is used for realizing micro-droplet image acquisition and comprises an image acquisition unit 6, a first optical imaging lens 7, a second optical imaging lens 9 and a micro-droplet capturing light source 17; the image acquisition unit 6 is arranged on the motion platform 8 and is coaxial with the circular observation hole 28 and used for converting the acquired image into an information format which can be identified and processed by the computer 27, and the specific conversion method is a conventional known method; the first optical imaging lens 7 is arranged on the left side of the image acquisition unit 6 and is used for secondarily scaling the image size and adjusting the imaging distance of the optical image projected to the image acquisition unit 6; the second optical imaging lens 9 is arranged on the left side of the first optical imaging lens 7 and is used for optically zooming the micro-droplet imaging size; the micro-droplet capturing light source 17 is arranged above the mounting substrate 2, is positioned on the left side of the micro-droplet generator 14 in parallel, is coaxial with the circular observation hole 28, and is used for simulating the triggering of the required light source by the image acquisition unit 6;
the utility model discloses a theory of operation:
when the utility model is used, the micro-droplet generator 14 is adjusted to the upper region of the second optical imaging lens 9 through the horizontal fine adjustment mechanism 11 and the vertical fine adjustment mechanism 12, at this time, the picture is in a completely black state because the picture view field is limited and the lens hood 13 prevents all visible light from entering the image acquisition unit 6;
when the liquid droplet generator 14 generates a single droplet 25, the same frequency signal triggers the droplet capture light source 17, and due to the linear propagation characteristic of light, a picture becomes bright once, but at this time, the picture is blurred because the imaging system is not focused, the focusing motor 3 drives the transmission mechanism 5 to push the motion platform 8 to move along the guide mechanism 4, as shown in fig. 4, the single droplet 25 is continuously zoomed through the first optical imaging lens 7 and the second optical imaging lens 9, and is displayed in the form of a pixelized droplet 26 after being observed, and at this time, a pixel value can be obtained by measuring a pixel point to a point.
The image capturing unit 6 is a photoelectric conversion image sensor, which can convert light energy into electric energy, and in the existing example, the photoelectric energy conversion can be realized by controlling a mechanical shutter or an electronic shutter to control the light entering the sensor.
The utility model discloses an observation object adopts eyepiece objective combination tight shot for pico liter level micro-droplet, greatly reduces imaging system light inlet amount, and has only focal plane, and it is fixed from the distance of forming images. On the basis, a light shield 13 is additionally arranged to filter interference light in the environment, the imaging space is simulated to be a camera darkroom, at the moment, the micro-droplet capturing light source 17 coaxial with the imaging system is excited through microsecond-level electric signals, the micro-droplet capturing light source 17 rapidly responds within 1 microsecond, and the micro-droplet capturing light source 17 is coaxial with the imaging system due to the fact that light has a linear propagation characteristic, so that the image acquisition unit 6 is excited to acquire images in an imaging area, and the imaging space is recovered to the darkroom again after one-time acquisition is completed.
The droplet generator 14 is driven by a fast-response electromechanical coupling element such as piezoelectric ceramic, the deviation of the driving performance is less than 0.1% under the same driving parameter, when the piezoelectric ceramic is driven to simultaneously trigger a droplet capturing light source triggering parameter which has the same frequency as the driving ceramic and has a fixed lag amount, the droplet attitude under the current parameter can be captured in real time, by adjusting the lag time, when the lag time is 0, the triggering is started, no droplet appears at the moment, and as the lag time is increased by microsecond, the visible droplet is changed from no droplet to near-far until the second droplet is generated into a cycle period.
As shown in fig. 2, the process of capturing the air attitude of the micro-droplets in real time according to the present invention is as follows:
A1. sending a starting instruction to the device driving controller 1 through the computer 27, so that the device driving controller 1 controls the mechanical motion structure, the imaging system and the micro-droplet generator 14 to be enabled;
A2. the device driving controller 1 controls the motion platform 8 to roughly adjust to the position of the theoretical object distance and controls the micro-droplet generator 14 to operate to the position 1/3 higher than the center of the visual field;
A3. the device driving controller 1 controls the micro-droplet generator 14 to generate micro-droplets, and simultaneously controls the micro-droplet capturing light source 17 to light up at the same frequency and with a rated lag time (the lag time can be set according to actual needs, for example, 50-100 microseconds);
A4. acquiring a first image of a nozzle and a lower dead zone of a droplet generator 14 in an imaging area acquired by an imaging system;
A5. when micro liquid drops are identified to be contained in the first image, sending a first test instruction to the mechanical motion structure, locking the horizontal fine adjustment mechanism 11 and the vertical fine adjustment mechanism 12, and setting the lag time of an initial micro liquid drop capturing light source to be 0 microsecond;
A6. circularly executing the following steps until the set acquisition cycle times are finished (the cycle times are set according to actual needs, such as 5-100 times);
A601. increasing the delay time of the rated micro-droplet capturing light source, and acquiring a second image of a micro-droplet generator nozzle and a lower dead zone in an imaging area acquired by an imaging system (the delay time of the rated micro-droplet capturing light source is set according to actual needs, for example, 20 microseconds);
A602. when micro liquid drops are identified to be contained in the first image, a first focusing instruction is sent to the mechanical motion structure, the motion platform 8 is made to perform reciprocating fine adjustment along the motion axis, and the edge information of the liquid drops in the collected image is continuously analyzed and judged whether focusing is completed; if the imaging system is not focused accurately, the edge of the liquid drop in the first image is blurred; if the focusing is successful, the liquid drop in the first image has the change of decreasing from the blurring area to increasing, if the focusing is not successful, the blurring area of the picture is increased, and whether the focusing is successful or not is judged according to the phenomenon;
A603. when focusing is finished, sending a first focusing stopping command to the device driving controller 1, and acquiring a second image containing liquid drops in unit time of the current position;
A604. according to the liquid drop form in the second image, acquiring the liquid drop overall dimension information by adopting the existing method, wherein the distance between the liquid drop center and the end surface of the nozzle of the droplet liquid generator 14 or the distance between the liquid drops, and sending a first finishing instruction to the device driving controller 1;
A605. judging whether the collection is finished;
if not, repeatedly executing A601 to A605;
if yes, executing A606;
A606. and integrating and analyzing the acquired images, calculating image pixels to obtain the diameter and the volume of the liquid drop, fitting a liquid drop flight curve according to the positions of the liquid drop acquired at different lag times, and calculating a liquid drop flight speed change curve according to the displacement and the lag time. As shown in fig. 3, the delay time of the micro-droplet capturing light source 17 is adjusted, and since the droplet flight trajectory is fixed, the change of the delay time corresponds to the change of the camera shutter opening/closing time, the first trigger time droplet 18, the second trigger time droplet 19, the third trigger time droplet 20, and the fourth trigger time droplet 21 are acquired by adjusting the delay time, the droplet flight trajectory is fitted by the least square method, and the final droplet landing point 22 is predicted.
Claims (7)
1. A micro-droplet air attitude real-time catching device, the micro-droplet is produced by the micro-droplet generator; the method is characterized in that: the device comprises a device driving control system, a mechanical motion structure and an imaging system;
the device driving control system is used for controlling the mechanical motion structure, the imaging system and the micro-droplet generator to move and collecting droplet images;
the mechanical motion structure is used for realizing the installation and fixation of the micro-droplet generator and the imaging system and the position adjustment of the micro-droplet generator and the imaging system;
the imaging system is arranged above the mechanical motion structure and comprises a micro-liquid drop capturing light source, an image acquisition unit and at least one optical imaging lens; the micro-droplet capturing light source is used for simulating the triggering of the image acquisition unit to the required light source; the image acquisition unit is used for realizing image acquisition; the optical imaging lens is used for zooming the image.
2. The micro-droplet air attitude real-time capturing device according to claim 1, characterized in that: the mechanical motion structure comprises a mounting substrate, a focusing motor, a guide mechanism, a transmission mechanism, a motion platform, a vertical plate, a horizontal fine adjustment mechanism, a vertical fine adjustment mechanism, a micro-droplet generator clamping mechanism and a light shield;
the focusing motor is arranged above the mounting substrate and is used for adjusting the object distance between the imaging system and the observed micro-droplets to realize clear imaging;
the guide mechanism is arranged above the mounting substrate along the direction of the motor shaft and is mechanically connected with the mounting substrate, and is used for restricting the degree of freedom of the motion platform and enabling the motion platform to only have a single degree of freedom moving along the axis of the guide mechanism;
the transmission mechanism is rigidly connected with the focusing motor and used for pushing the motion platform;
the vertical plate is arranged above the mounting substrate and positioned on one side of the guide mechanism, an observation hole is formed in the middle of the vertical plate, and the imaging system observes the form of the target through the observation hole;
the horizontal fine adjustment mechanism is arranged on the vertical plate, the vertical fine adjustment mechanism is arranged on the horizontal fine adjustment mechanism, the micro-droplet clamping framework is arranged on the vertical fine adjustment mechanism, and the three mechanisms jointly realize the position adjustment of the micro-droplet generator;
the light shield is used for isolating external ambient light to meet the dark room requirement of the imaging system.
3. The micro-droplet air attitude real-time capturing device according to claim 2, characterized in that: the imaging system comprises an image acquisition unit, a first optical imaging lens, a second optical imaging lens and a micro-droplet capturing light source;
the image acquisition unit is arranged on the motion platform, is coaxial with the observation hole and is used for converting the acquired image into an information format which can be identified and processed by the device driving control system;
the second optical imaging lens is used for optically zooming the imaging size of the micro-droplet;
the first optical imaging lens is used for secondarily zooming the image size and adjusting the imaging distance of the optical image projected to the image acquisition unit;
the micro-droplet capturing light source is arranged above the mounting substrate and is coaxial with the observation hole, and is used for simulating the light source required by triggering of the image acquisition unit.
4. The micro-droplet air attitude real-time capturing device according to any one of claims 2-3, characterized in that: and a foot margin or a damping vibration isolation fixer is arranged below the mounting substrate.
5. The micro-droplet air attitude real-time capturing device according to claim 4, characterized in that: the mechanical movement structure further comprises a locking device used for locking the micro-droplet generator.
6. The micro-droplet air attitude real-time capturing device according to claim 5, characterized in that: the locking device is a long rod structure with an external thread structure;
and two sides of the bottom end of the micro-droplet generator clamping mechanism are provided with threaded mounting holes, and the locking device is matched and connected with the threaded mounting holes and is locked through rotation.
7. The micro-droplet air attitude real-time capturing device according to claim 6, characterized in that: the device driving control system comprises a device driving controller and a computer; the device driving controller is electrically connected with the mechanical motion structure, the imaging system and the micro-droplet generator; the computer is electrically connected with the device driving controller, and controls the mechanical motion structure, the imaging system and the micro-droplet generator to move and collect droplet images through the device driving controller.
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| CN202221170708.8U CN218865093U (en) | 2022-05-16 | 2022-05-16 | Micro-droplet air attitude real-time capturing device |
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| CN202221170708.8U CN218865093U (en) | 2022-05-16 | 2022-05-16 | Micro-droplet air attitude real-time capturing device |
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