Time-Division PID Sensor for Single-Region VOC Separation
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Solution Overview
Problem
Traditional VOC detectors using FAIMS techniques are cumbersome, require multiple electrodes, and have ionization sources that are constantly enabled, leading to ion loss and reduced device lifespan.
Innovation Solution
A PID VOC sensor that integrates ionization, separation, and detection phases in a single region using a single set of interdigital poles with a switch to alternate between a compensation voltage source and a processing device, allowing for efficient detection and prolonging the ionization source's life by disabling it during detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple electrodes are used for separation and detection in FAIMS-based VOC detectors, then separation and detection functions are achieved, but device complexity and size increase
Solution Approach 1:
The patent combines separation and detection functions into a single physical region using one set of interdigital poles. The poles alternately perform separation (when connected to compensation voltage source) and detection (when connected to processing device) through time-division multiplexing controlled by a switch, eliminating the need for separate electrode sets and reducing device complexity while maintaining detection reliability
Solution Approach 2:
The patent dynamically switches the connection of the interdigital poles between two states: connected to compensation voltage source for separation phase, and connected to processing device for detection phase. This dynamic switching allows a single static electrode structure to perform multiple functions sequentially, reducing hardware complexity while preserving full detection capability
2Duration of action of stationary object
If ionization source is constantly enabled for continuous detection, then detection continuity is maintained, but ion loss increases and device lifespan decreases
Solution Approach 1:
The patent implements periodic operation where the ionization source is enabled only during the detection phase (when poles are connected to processing device) and disabled during the separation phase (when poles are connected to compensation voltage source). This periodic activation reduces cumulative ion loss and extends device lifespan while maintaining detection continuity through systematic alternation between phases
Solution Approach 2:
The patent ensures continuous detection capability by systematically alternating between separation and detection phases through switch-controlled voltage source connection. The ionization source operates continuously in the sense that the system continuously cycles through phases, but the source itself is pulsed to coincide with detection events, maintaining operational continuity while reducing unnecessary activation and associated damage
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 simplifies the sensor architecture, reduces size and complexity, improves detection accuracy, and extends the device's lifespan by confining all phases to a single region and switching off the ionization source during detection.
Implementation Method 1
an ionization device configured to interact with the gas within the detecting region creating a plurality of ionized gas molecules
Implementation Method 2
leveraging differences in high-field and low-field ion mobility of target VOCs
Data Source
AI summary
A method, apparatus, and computer program product for detecting volatile organic compounds (VOCs) in a gas is provided. An example VOC detector may include a processing device and a detecting region. The detecting region may further include a first interdigital pole electrically connected to a separation voltage source, a second interdigital pole electrically connected to a switch, and an ionization device configured to interact with the gas within the detecting region to create a plurality of ionized gas molecules. To facilitate detection of VOCs, the switch may alternate the connection of the second interdigital pole between a compensation voltage source and the processing device. The processing device may determine a number of volatile organic compounds in the gas based at least in part on a number of ionized gas molecules that contact the second interdigital pole while the second interdigital pole is electrically connected to the processing device.