Pipette Imaging Control for Precise Test Tube Residual Volume
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Solution Overview
Problem
Current liquid volume control devices face challenges in precisely controlling the remaining volume of liquid in a test tube, resulting in significant deviations from the target preset volume.
Innovation Solution
A liquid volume control device and method that utilizes a pump, driver, transfer device, camera, and controller to capture images of the pipette and liquid, calculate height compensation values, and adjust the pipette's insertion depth to accurately control the liquid volume, minimizing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional liquid volume control device is used, then the liquid extraction process is simple, but the precision of remaining volume control is poor with significant deviation from target volume
Solution Approach 1:
The system performs preliminary imaging and calculation of insertion depth before liquid extraction. The controller captures images of the liquid level and pipette position, calculates the required insertion depth to achieve target remaining volume, and adjusts the pipette insertion depth accordingly before suction begins, ensuring precise volume control from the start
Solution Approach 2:
The system uses image capture and analysis to obtain feedback on liquid level and pipette position. The controller processes these images to determine actual insertion depth and liquid volume, compares it with target values, and adjusts the insertion depth for subsequent extractions to maintain precise remaining volume control
2Measurement precision
If repeated testing is performed to achieve accurate liquid volume, then measurement precision improves, but time consumption increases
Solution Approach 1:
The system performs preliminary imaging of the liquid level and pipette position before extraction, calculates the optimal insertion depth in advance, and executes the extraction with predetermined parameters. This preliminary calculation eliminates the need for repeated testing and achieves accurate liquid volume control in a single operation
Data Source
AI summary
A liquid volume control device for controlling a liquid volume of a liquid in a test tube includes a pump, a driver, a transfer device, a camera and a controller. The pump is connected to a pipette, used to suck the liquid out of a test tube. The driver is connected to the pump and used to drive the pump. The transfer device is used to transfer the test tube. The camera is used to capture a first image of a suction end of the pipette and a second image of the liquid in the test tube. When the first image is captured, the test tube is outside a capture area of the camera. When the second image is captured, the test tube is inside the capture area of the camera. The controller is electrically connected to the camera, the transfer device, the driver and the pump.