Turbidity Sensor Passive Chamber Design
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Solution Overview
Problem
Turbidity sensors face challenges in maintaining low air humidity within the optical path due to fogging on glass surfaces, which requires energy-intensive and space-consuming active drying cycles to circulate air past a drying agent.
Innovation Solution
A compact, energy-saving turbidity sensor design featuring a passive chamber system where air exchange occurs by convection, with a single drying chamber containing a drying agent that effectively reduces humidity throughout the system without active air circulation, ensuring low humidity levels in the optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an active drying cycle with a pump is used to circulate air past the drying agent, then the air humidity in the optical path is effectively reduced, but the device requires valuable installation space and continuous energy input
Solution Approach 1:
The system uses self-service by allowing the drying agent to passively absorb humidity from the air in the optical path without requiring external energy input or active circulation. The drying agent serves itself by continuously absorbing moisture from the air that naturally passes through the chamber system during normal operation.
Solution Approach 2:
The patent replaces the mechanical pump system with a passive chamber design where air circulation is achieved through natural convection and diffusion processes. The mechanical active circulation is substituted by allowing air to move naturally through the chambers, eliminating the need for energy-consuming pumps while maintaining effective humidity control.
2Reliability
If an active drying cycle with a pump is used to circulate air past the drying agent, then the air humidity in the optical path is effectively reduced, but the device occupies valuable installation space
Solution Approach 1:
The chamber system is segmented into distinct functional zones (lighting chamber, sensor chamber, drying chamber) that are fluidically connected. This segmentation allows each component to be optimized for its specific function while maintaining a compact overall structure. The drying chamber can be smaller since it only needs to handle air locally rather than circulate it through the entire system.
Solution Approach 2:
The patent employs a nested arrangement where the drying chamber is integrated within the overall chamber system structure. The drying agent is positioned to efficiently capture humidity from air passing through the optical path chambers, creating a compact configuration where multiple functions share space rather than requiring separate dedicated areas for each function.
3Reliability
If multiple drying chambers are used to ensure adequate humidity control, then the drying effectiveness is improved, but the device complexity and volume increase
Solution Approach 1:
The single drying chamber is designed to serve multiple functions: it acts as a humidity control zone, a air sampling chamber, and an integrated part of the optical path system. The drying agent in this single chamber effectively handles humidity control for the entire system due to the fluidic connectivity and natural air circulation patterns, eliminating the need for multiple separate drying chambers.
4Use of energy by moving object
If a passive chamber system without pump is used, then the device is compact and energy-saving, but the air circulation may be insufficient to maintain low humidity levels
Solution Approach 1:
The patent utilizes natural pneumatic convection and pressure differential mechanisms to drive air circulation through the chamber system. The lighting chamber, sensor chamber, and drying chamber are fluidically connected to create natural airflow paths that sufficient to maintain effective humidity control without requiring mechanical pumps or external energy input.
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 solution allows for a compact and energy-efficient turbidity sensor that maintains accurate measurements by passively managing air humidity, reducing the need for energy expenditure and installation space, while extending the service life of the drying agent.
Implementation Method 1
a drying agent (50) and a chamber system (54). The chamber system comprises a central receiving space (28) in which the cuvette (18) is arranged, an lighting chamber (42) adjoined by the lighting means (20), at least one sensor chamber (44, 46) adjoined by the light sensor (21, 22), and a drying chamber (52) in which the drying agent (50) is arranged
Implementation Method 2
The chamber system is configured as a passive, pump-free system in which, during operation, an exchange of air between the chambers takes place exclusively passively, in particular by convection
Data Source
AI summary
A turbidity sensor has a housing, a cuvette for a sample medium, a lighting source, a light sensor, a drying agent and a chamber system. The chamber system includes a central receiving space in which the cuvette is arranged, a lighting chamber adjoined by the lighting source, at least one sensor chamber adjoined by the light sensor, and a drying chamber in which the drying agent is arranged. The lighting chamber, the at least one sensor chamber and the drying chamber are each fluidically connected to the central receiving space. The chamber system is here configured as a passive, pump-free system.