Adaptive Gain Liquid Level Detection for Metal Containers
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Solution Overview
Problem
Conventional liquid level detecting devices in sample applying systems face challenges in achieving high sensitivity and reliability due to varying environmental conditions, such as metal containers and low liquid volumes, leading to incorrect detection results.
Innovation Solution
A liquid level detecting device with a control unit that adjusts the gain of an amplifying unit based on environmental information, allowing for adaptive sensitivity and reliability in detecting the liquid level by converting capacitance signals into voltage signals and comparing them with a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional liquid level detecting devices are used in metal containers, then the device structure is simple, but the detection accuracy deteriorates due to apparent capacitance change of the sampling needle itself
Solution Approach 1:
The patent changes the detection parameter from direct capacitance measurement to voltage signal measurement after RC circuit conversion. By converting the capacitance change signal through a resistor-capacitor circuit, the system transforms the detection mechanism to one that is less susceptible to environmental capacitance interference, thereby improving measurement precision while maintaining device simplicity
Solution Approach 2:
The patent introduces an RC circuit as an intermediary between the sampling needle and the detection system. This intermediate circuit converts the capacitance change into a voltage signal, acting as a mediator that isolates the detection system from direct exposure to environmental capacitance variations, thus resolving the contradiction between simple structure and accurate detection
2Device complexity
If conventional liquid level detecting devices are used in plastic containers with low liquid volume, then the device structure is simple, but the detection sensitivity deteriorates due to weak capacitance change signal
Solution Approach 1:
The patent implements dynamic gain adjustment of the amplifier based on the detected environment type. The system automatically adapts the amplification factor according to whether it detects a metal container environment or a plastic container environment, optimizing detection sensitivity for low liquid volume conditions while maintaining simple device structure through automated parameter adjustment
Solution Approach 2:
The patent changes the amplification parameter dynamically based on environmental detection. By adjusting the amplifier gain according to the container type and liquid volume conditions, the system optimizes the detection sensitivity for weak capacitance change signals without increasing structural complexity, as the parameter adjustment is performed electronically
3Device complexity
If fixed gain amplification is used, then the device structure is simple, but the adaptability deteriorates when detecting in various complex environments
Solution Approach 1:
The patent implements a feedback mechanism where the control unit detects environmental information and automatically adjusts the amplifier gain accordingly. The system receives feedback about the detection environment (metal container, plastic container, liquid volume) and dynamically adjusts the amplification parameter, achieving high adaptability while maintaining relatively simple device structure through automated control
Solution Approach 2:
The patent transforms the static gain amplification into a dynamic system where the amplification factor changes based on environmental conditions. The control unit continuously monitors the detection environment and adjusts the amplifier gain in real-time, enabling the system to adapt to various complex environments without significantly increasing structural complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device ensures accurate detection of liquid levels in diverse environments by optimizing signal amplification, preventing false positives and ensuring sensitivity, thereby enhancing the reliability of the detection process.
Implementation Method 1
The liquid level detecting device converts capacitance change in the sampling needle into voltage or potential change and determines whether the sampling needle contacts the liquid level based at least in part on this change in capacitance
Implementation Method 2
the optional amplifying unit receives the corresponding voltage signal and optionally amplifies the voltage signal according to the set gain to output the amplified voltage signal
Data Source
AI summary
Various embodiments disclose a liquid level detecting device and method, which comprises: a control unit configured to output control instructions corresponding to environmental information according to the environmental information of a location of a sampling needle; an amplifying unit configured to set a gain according to the control instructions; a converting unit configured to receive and convert a capacitance signal from the sampling needle to a voltage signal; the amplifying unit receives the voltage signal and amplifies the voltage signal according to the gain; the control unit receives the amplified voltage signal and compares the amplified voltage signals with a preset voltage threshold to determine whether the sampling needle contacts the liquid level. Some embodiments further disclose a sample application system. Various embodiments consider both sensitivity and reliability of a detection system and is adaptable to various detection environments.