Dual-Port MEMS Sensor with Elastic Volume Adjustment
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Solution Overview
Problem
MEMS sensors, such as microphones and pressure sensors, face challenges in versatility due to fixed frequency responses, limiting their application in diverse systems without significant redesign.
Innovation Solution
A MEMS sensor system with a dual-port design, featuring a sensor package with two openings that allow for acoustic coupling to an external environment, enabling flexible frequency response adjustment by varying the back volume, and incorporating an elastic element to alter the partial volume based on fluid pressure, thus accommodating different system configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a MEMS sensor uses a fixed back volume design, then the manufacturing process is simple and standardized, but the frequency response cannot be adapted to different system requirements
Solution Approach 1:
The MEMS sensor module is designed with a standardized interface and dual openings that can accommodate different back volume configurations. The same basic module can be used in multiple applications by varying the back volume design, making the sensor universal across different system requirements while maintaining standardized manufacturing processes.
Solution Approach 2:
The sensor package is divided into a fixed MEMS module portion and a variable back volume portion. This segmentation allows the MEMS module to be manufactured once with standardized processes, while the back volume can be customized for different frequency response requirements, separating the invariant and variable aspects of the design.
2Adaptability or versatility
If the back volume is made variable to influence frequency response, then the MEMS sensor can be used in diverse systems, but the device complexity increases
Solution Approach 1:
The back volume is designed as a dynamic parameter that can be adjusted based on the application requirements. The dual opening configuration allows the back volume to be modified without changing the core MEMS module, enabling the system to adapt to different frequency response needs while keeping the base design simple.
3Adaptability or versatility
If an elastic element is added to alter partial volume based on fluid pressure, then frequency response can be dynamically adjusted, but the device complexity increases
Solution Approach 1:
The elastic element is designed to automatically adjust the second partial volume in response to fluid pressure changes without requiring external control mechanisms. The element self-regulates the volume based on the operating conditions, providing dynamic frequency response adjustment while minimizing the need for additional complex control systems.
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
Enables the use of identical MEMS modules in various systems with tailored frequency responses, enhancing flexibility and adaptability while maintaining a standard production process.
Implementation Method 1
an elastic element arranged in the second opening and configured to alter a content of the second partial volume on the basis of a fluid pressure in the external environment
Implementation Method 2
A first opening in the sensor package connects the first partial volume to an external environment of the sensor package in an acoustically transparent fashion
Implementation Method 3
A second opening in the sensor package connects the second partial volume to an external environment of the sensor package in an acoustically transparent fashion
Implementation Method 4
MEMS sensors, such as microphones and pressure sensors, face challenges in versatility due to fixed frequency responses
Implementation Method 5
The system volume sets a resonant frequency of the membrane for fluid sound in the environment of the MEMS sensor system
Data Source
AI summary
A MEMS sensor includes a sensor package and a membrane arranged in the sensor package, wherein a first partial volume of the sensor package adjoins a first main side of the membrane and a second partial volume of the sensor package adjoins a second main side of the membrane, wherein the second main side is arranged opposite the first main side. The MEMS sensor includes a first opening in the sensor package, said first opening connecting the first partial volume to an external environment of the sensor package in an acoustically transparent fashion. The MEMS sensor includes a second opening in the sensor package, said second opening connecting the second partial volume to the external environment of the sensor package in an acoustically transparent fashion.