MEMS Microphone Gas Sensor Port Isolation
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Solution Overview
Problem
Internal heat generated by electronic devices can alter ambient temperature and humidity levels, negatively impacting the measurement accuracy of gas sensors used to detect offensive odors, smoke, and volatile organic compounds.
Innovation Solution
A microelectromechanical system (MEMS) device co-packages a gas sensor with a microphone, positioning the gas sensor away from internal heat sources and fluidly coupling it to the ambient environment through a port, minimizing proximity to heat sources and maximizing exposure to ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gas sensor is placed within the electronic device, then the device can detect air quality, but the internal heat generated by other components alters ambient temperature and humidity levels which negatively impacts the measurement accuracy of the gas sensor
Solution Approach 1:
The device is divided into separate functional modules: a first housing containing the gas sensor and a second housing containing the electronic components. This segmentation isolates the gas sensor from heat-generating components while maintaining overall device functionality.
Solution Approach 2:
The gas sensor is extracted from the main electronic device housing and placed in a separate first housing that is fluidly coupled to the ambient environment. This extraction removes the sensor from the harmful thermal environment generated by internal electronic components.
2Measurement precision
If the gas sensor is isolated from internal heat sources, then measurement accuracy improves, but the device structure becomes more complex
Solution Approach 1:
The gas sensor housing is merged with the electronic device housing through fluid coupling, allowing the sensor to be physically separated from heat sources while maintaining integration within the overall device structure. The port provides a shared fluid pathway between the sensor cavity and ambient environment.
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
This configuration enhances the accuracy of gas detection by isolating the gas sensor from internal heat sources, ensuring precise measurement of indoor and outdoor air quality.
Implementation Method 1
The transducer is configured to convert the acoustic energy into an electrical signal
Implementation Method 2
The sensor is configured to facilitate detecting at least one of an offensive odor, smoke, a volatile organic compound, carbon monoxide, carbon dioxide, a nitrogen oxide, methane, and ozone
Data Source
AI summary
Systems and apparatuses for a microelectromechanical system (MEMS) device. The MEMS device includes a housing, a transducer, and a sensor. The housing includes a substrate defining a port and a cover. The substrate and the cover cooperatively form an internal cavity. The port fluidly couples the internal cavity to an external environment. The transducer is disposed within the internal cavity and positioned to receive acoustic energy through the port. The transducer is configured to convert the acoustic energy into an electrical signal. The sensor is disposed within the internal cavity and positioned to receive a gas through the port. The sensor is configured to facilitate detecting at least one of an offensive odor, smoke, a volatile organic compound, carbon monoxide, carbon dioxide, a nitrogen oxide, methane, and ozone.