Multi-Species Gas Sensor with Integrated Heater and Insulating Pocket
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Solution Overview
Problem
Current air quality monitoring technologies face challenges in effectively detecting multiple gas species, particularly carbon dioxide and volatile organic compounds, due to the bulkiness and high cost of existing sensors, which fail to provide real-time, accurate, and multi-species gas monitoring, leading to compromised indoor air quality and associated health issues.
Innovation Solution
A miniature multi-species gas sensor device integrated into a single chip, including a VOC sensor and CO2 sensor, along with environmental sensors, processors, and memory, which can be seamlessly integrated into various products, offering continuous air quality monitoring with humidity and temperature data, utilizing a conformal thin film VOC sensor and a heater with a low temperature coefficient of resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional air quality sensors are used to detect multiple gas species, then detection capability is provided, but the devices are bulky and expensive
Solution Approach 1:
The patent combines multiple gas sensing functions (VOC detection and CO2 detection) into a single integrated sensor device. The sensor array includes both a VOC sensor and a CO2 sensor on one chip, eliminating the need for separate bulky devices and reducing overall system volume while maintaining multi-species detection capability
Solution Approach 2:
The integrated sensor device performs multiple functions simultaneously - detecting volatile organic compounds, detecting carbon dioxide, monitoring temperature, and monitoring humidity. This multi-functional approach replaces what would traditionally require multiple separate devices, reducing both volume and cost
2Measurement precision
If conventional air quality sensors are used to detect multiple gas species, then detection capability is provided, but the cost is high
Solution Approach 1:
The patent integrates multiple sensing elements (VOC sensor, CO2 sensor, temperature sensor, humidity sensor) onto a single chip or substrate. This consolidation reduces manufacturing costs by eliminating the need for multiple separate components, assembly processes, and housing structures that would be required for conventional multi-sensor systems
Solution Approach 2:
The patent employs a heater with low temperature coefficient of resistance to maintain stable operating temperatures for the gas sensing elements. This parameter optimization improves sensor accuracy while reducing power consumption and manufacturing complexity compared to conventional heating approaches
3Loss of energy
If air circulation is reduced to improve heat efficiency, then energy efficiency is improved, but gas accumulation increases
Solution Approach 1:
The integrated sensor device enables buildings to self-monitor their internal air quality by continuously detecting CO2 and VOC levels. This allows occupancy-based ventilation control where air circulation is dynamically adjusted based on actual gas accumulation, maintaining energy efficiency while preventing harmful gas concentrations
Solution Approach 2:
The sensor provides real-time feedback on gas concentrations, enabling control systems to adjust ventilation rates dynamically. When CO2 or VOC levels rise above thresholds, the system increases air circulation; when levels are acceptable, ventilation is reduced to maintain energy efficiency
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 a smaller, more accurate, and cost-effective multi-species gas sensor that can continuously monitor air quality, improving indoor health by detecting hazardous gas levels, enhancing productivity and reducing health risks associated with poor air quality.
Implementation Method 1
The multi-species gas micro-sensor includes a VOC sensor in the form of a conformal thin film
Implementation Method 2
a heater having a low temperature coefficient of resistance
Data Source
AI summary
A microelectronic device capable of detecting multiple gas constituents in ambient air can be used to monitor air quality. The microelectronic air quality monitor includes a plurality of temperature-sensitive gas sensors tuned to detect different gas species. Each gas sensor is tuned by programming an adjacent heater. An insulating air pocket formed below the sensor helps to maintain the sensor at a desired temperature. A temperature sensor may also be integrated with each gas sensor to provide additional feedback control. The heater, temperature sensor, and gas sensors are in the form of patternable thin films integrated on a single microchip. The device can be incorporated into computer workstations, smart phones, clothing, or other wearable accessories to function as a personal air quality monitor that is smaller, more accurate, and less expensive than existing air quality sensors.