7 results about "Liquid meniscus" patented technology

The present invention discloses an independent injection control method and injection device for an arrayed electrohydrodynamic nozzle, belonging to the technical field of inkjet printing. The injection device includes an electrohydrodynamic nozzle, a high-voltage power supply, a laser module, and a control module. The electrohydrodynamic nozzle is composed of an ink cartridge, a nozzle plate, and a nozzle. The high-voltage power supply is used to provide high voltage electricity to form an electric field driving force to eject the solution. The laser module generates laser for regulating the temperature of the liquid meniscus of the solution. The control module controls the opening and closing of the high-voltage power supply and the laser. The present invention regulates the temperature of the liquid meniscus at the tip of the nozzle by using a laser-induced method, changes the surface tension coefficient of the solution at the tip of the liquid meniscus through the change of temperature, realizes the adjustment between the electric field force and the surface tension, and further controls the independent injection of each nozzle. In this way, the present invention can realize the independent injection of each nozzle without changing the nozzle structure, and has the advantages of simple nozzle structure and convenient maintenance.

The present invention belongs to the field of image spectrum detection, and specifically relates to a high-precision detection method for the contour of the meniscus of liquid in a capillary tube. It comprises a telecentric lens, an industrial camera, a displacement platform, a light source, a capillary tube and a culture dish; the industrial camera, the capillary tube and the culture dish are respectively mounted on different displacement platforms. The light source is provided with a rotating telescopic rod to achieve all-round movement. When photographing the contour of the meniscus of liquid in the capillary tube, the light source, the meniscus of the capillary tube and the industrial camera are adjusted to be aligned on the same horizontal plane. Based on the principle of telecentric imaging and the principle of light refraction, a distortion correction function for the contour of the meniscus in the capillary tube is derived. The present invention uses an industrial camera in combination with a telecentric lens, thereby avoiding the problem of shape distortion caused by changes in the distance between the object and reducing the difficulty of image distortion correction. The meniscus contour distortion correction function derived based on the telecentric imaging principle can accurately calculate the actual value of the meniscus contour and restore the actual contour of the meniscus.

This application relates to the field of micro / nano-scale flow measurement technology, and discloses a liquid flow measurement method and apparatus based on capillary interface optical tracking. The method includes: determining edge point cloud data of the gas-liquid meniscus in a capillary during a target detection period; performing circular fitting and geometric parameter calculation based on the edge point cloud data to obtain contact data of the gas-liquid meniscus; wherein the contact data includes the contact angle and the contact position between the gas-liquid meniscus and the inner wall of the capillary; and performing flow correction processing based on the contact data to determine the corrected volumetric flow rate during the target detection period. Its beneficial effect is that by using circular fitting and geometric parameter calculation to generate contact data including the contact angle and contact position, the deformation state of the meniscus is quantified, effectively eliminating the volume measurement deviation caused by the meniscus cap deformation, and significantly improving the accuracy and reliability of liquid flow measurement under ultra-low flow and dynamic changing conditions.

To provide a liquid discharge apparatus capable of suppressing occurrence of meniscus collapse and a failure to eliminate thickening of liquid in a nozzle.SOLUTION: A liquid discharge apparatus includes: a liquid discharge head including individual flow paths including pressure chambers and nozzles, a common supplying flow path, a common discharging flow path, and piezoelectric elements provided corresponding to the pressure chambers; and a drive control unit for performing discharge control and micro-vibration control, where the nozzles are configured by coupling a first nozzle portion and a second nozzle portion in a height direction, the second nozzle portion being provided closer to the individual flow paths than the first nozzle portion and having a larger diameter than the first nozzle portion, and where the nozzle satisfies B<20 [μm] and C+D>70 [μm] and the drive control unit is configured to perform the micro-vibration control so as to satisfy C / 3<M<C+D / 2 when A is a diameter of the first nozzle portion, B is a diameter of the second nozzle portion, C is a height of the first nozzle portion, D is a height of the second nozzle portion, and M is a maximum pull-in amount of meniscuses of liquid at the time of the micro-vibration control by the drive control unit.SELECTED DRAWING: Figure 5

A laboratory automation apparatus with a liquid volume measurement functionality comprising a working table, a pipettor comprising a pipetting head with an electrode providing a capacitive sensor with a reference electrode. A robotic arm is configured to move the pipetting head above the working table. A processor is operatively coupled to the robotic arm, to the pipettor and to the electrode by an electronic circuit. A capillary is located on the working table having an opening for receiving a target amount of liquid from the pipettor to form an air-liquid meniscus in the capillary. The robotic arm is configured to hover the electrode over the capillary to detect a change in capacitance related to the position of the meniscus, and the processor is configured to calculate the transferred amount of liquid from the position of the meniscus in the capillary.

The invention discloses a method and system for measuring the volume of liquid and meniscus in a transparent container, and the method comprises the steps: collecting meniscus images of a plurality of different circumferential visual angles of a to-be-measured transparent container, and extracting a corresponding meniscus feature parameter group from each meniscus image; splicing the liquid level characteristic parameter group of each meniscus image to form a spliced characteristic parameter sequence; and inputting the splicing characteristic parameter sequence into a preset meniscus volume prediction model to obtain the volume value of the liquid in the transparent container to be measured. According to the invention, prediction is carried out by extracting the meniscus characteristic parameter groups of different visual angles, so that the accuracy of liquid meniscus volume prediction can be greatly improved; and then a high-precision liquid meniscus volume value is adopted to correct an estimated volume value of the liquid in the to-be-detected transparent container, wherein the estimated volume value is output by the preset volume prediction model based on image detection, so that the precision of liquid volume prediction can be greatly improved.

A laboratory automation device with a liquid volume measurement function includes a table, a pipettor including a pipetting head having an electrode that provides a reference electrode for a capacitive sensor. The robotic arm is configured to move the pipette head over the table. The processor is operatively coupled to the robotic arm, the pipettor, and the electrode by electronic circuitry. The capillary tube is located on a table having an opening for receiving a target amount of liquid from the pipettor to form a gas-liquid meniscus in the capillary tube. The robotic arm is configured to hover the electrode over the capillary to detect a change in capacitance associated with a position of the meniscus, and the processor is configured to calculate a transfer amount of the liquid based on the position of the meniscus in the capillary.