Liquid Amount Control Device with Optical Feedback
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Solution Overview
Problem
Conventional liquid amount control devices struggle to accurately control the remaining liquid amount in a test tube, often resulting in significant differences between the actual and target preset amounts.
Innovation Solution
A liquid amount control device comprising a position detector, pump, driver, and controller, which works by detecting the end height position of a suction tip, controlling its entry depth into the liquid, and managing the suction process to precisely control the liquid amount, utilizing a combination of mechanical and image processing technologies to achieve accurate liquid level management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional liquid amount control devices are used to repeatedly suck up liquid in the test tube, then the liquid can be removed from the test tube, but the remaining liquid amount cannot be accurately controlled and results in large difference from the target preset amount
Solution Approach 1:
The patent replaces the conventional mechanical suction-only approach with a combined optical-mechanical system. An optical detection device (camera or optical sensor) is introduced to detect the liquid level position in the test tube, and this optical information is used to control the suction tip's movement and suction operation, thereby achieving precise control of the remaining liquid amount that cannot be achieved by mechanical means alone.
Solution Approach 2:
The patent implements a feedback control mechanism where the optical detection device continuously monitors the liquid level in the test tube during the suction process. The detected liquid level information is fed back to the control system, which adjusts the suction tip's position and suction rate in real-time to ensure the remaining liquid amount reaches the target preset value accurately.
2Quantity of substance
If the suction tip enters the liquid deeply to suck up more liquid, then the suction amount increases, but it becomes difficult to accurately control the remaining liquid amount to the target preset amount
Solution Approach 1:
The patent makes the suction tip's position dynamic and adjustable based on real-time optical detection of the liquid level. Rather than using a fixed deep insertion depth, the suction tip's position is continuously adjusted during the suction process according to the detected liquid level, allowing the system to suction adequate liquid while maintaining precise control over the remaining amount.
Solution Approach 2:
The patent changes the control parameters from fixed mechanical insertion depth to dynamic optical-based position control. The suction tip's position parameter is adjusted in real-time based on optical detection feedback, and the suction rate parameter is also modulated according to the detected liquid level, enabling both adequate suction and precise remaining amount control.
Data Source
AI summary
A liquid amount control device includes a position detector, a pump, a driver and a controller. The pump is connected with a first tip and configured to suck up the liquid out of the test tube. The driver is connected with the pump and configured to drive the pump to move. The controller is configured to: (1) control the driver to drive a first suction end of the first tip to enter a detection region of the position detector to obtain an end height position of the first suction end; (2) control the driver to drive the first suction end of the first tip to enter the liquid by a first entering depth according to the end height position; and (3) control the pump to suck up the liquid in the test tube through the first tip.