Multi-Cell Photo-Ionization Detector With One Radiation Source
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Solution Overview
Problem
Existing photo-ionization detectors (PIDs) lack reliability and efficiency in detecting ionizable substances, particularly due to the limitations of single measuring cells and multiple radiation sources, which affect their lifespan, energy consumption, and calibration requirements.
Innovation Solution
A photo-ionization detector with multiple measuring cells and a single radiation source, where each cell is mounted on a carrier and selectively connected to the environment for analysis, allowing for different operational states to enhance reliability and extend the device's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple radiation sources are used in PIDs, then detection capability is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent divides the detection system into multiple measuring cells (at least two) that share a single radiation source. Each measuring cell is independently configurable for different measurement tasks, effectively segmenting the detection function while reducing the number of radiation sources needed.
Solution Approach 2:
A single radiation source serves multiple measuring cells simultaneously, making the radiation source multi-functional. The system can switch between different measuring cells depending on the detection requirements, allowing one radiation source to fulfill multiple detection roles.
2Productivity
If multiple measuring cells are permanently connected to the environment, then continuous monitoring is improved, but measuring cell lifespan decreases
Solution Approach 1:
The system dynamically switches between multiple measuring cells rather than having them all permanently exposed. The connection to the environment is changed over time, with each measuring cell being activated in sequence or based on detection needs, thereby extending their individual lifespans while maintaining continuous monitoring capability.
Solution Approach 2:
The measuring cells are activated in a periodic or sequential manner rather than simultaneously. This periodic activation pattern reduces the cumulative exposure time for each measuring cell to environmental factors, extending their operational life while maintaining overall system productivity.
3Adaptability or versatility
If multiple measuring cells are used, then detection versatility is improved, but calibration complexity increases
Solution Approach 1:
The patent combines multiple measuring cells into a single integrated system with a shared radiation source and control architecture. This merging approach allows the system to maintain detection versatility through multiple cells while simplifying calibration by providing a unified calibration process for the entire system rather than separate calibrations for each cell.
4Use of energy by stationary object
If a single radiation source is used with multiple measuring cells, then energy consumption is reduced, but detection coverage must be switched
Solution Approach 1:
The system prepares multiple measuring cells in advance, with each cell pre-configured for specific measurement tasks. This preliminary preparation allows for rapid switching between cells without significant delay, as the cells are already ready for their respective functions when needed.
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 provides enhanced reliability and extended lifespan by ensuring only one measuring cell is exposed to the environment at a time, reducing energy consumption and simplifying calibration, while maintaining accurate detection of ionizable substances across a wide concentration range.
Implementation Method 1
The emitted radiation ionizes molecules of an ionizable substance, with the ionizable substance being part of a gas in the measuring section
Implementation Method 2
The ionization changes an electrical property of the measuring electrode. A sensor measures an indication of this changeable electrical property
Data Source
AI summary
A photo-ionization detector (100) and a process detect an ionizable substance in a gas (G). At least two measuring cells (20.1, 20.2, 20.3) are mounted on a measuring cell carrier (10). A radiation source (4) emits ionizing electromagnetic radiation towards the measuring cell carrier (10). The gas (G) reaches at least one measuring cell (20.1, 20.2, 20.3). Ionization of the gas causes a measurable electrical property of the measuring cell (20.1, 20.2, 20.3) to be changed. Depending on the electrical property, the measuring cell (20.1, 20.2, 20.3) generates a signal. This signal correlates with the presence and optionally the concentration of ionizable substance in the gas (G). Preferably, the measuring cell carrier (10) can be rotated relative to the radiation source (4).