Floating Base Vector Sensor for Low-Frequency Directionality
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for detecting the direction of arrival (DOA) of acoustic signals, especially low-frequency signals in viscous mediums, face limitations due to large sensor arrays and sensitivity issues with existing micromechanical vector sensors, which struggle with small deformation measurements and require rigid mounting.
Innovation Solution
A floating base vector sensor utilizing a micro/nano-scale, two-dimensional mesh structure that measures acoustically induced normal displacement to detect particle velocity, enhancing sensitivity and eliminating the need for rigid anchoring by leveraging acoustically induced flow forces and scattering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure sensor arrays are used to detect low frequency acoustic signals, then directionality can be achieved, but the array size becomes prohibitively large
Solution Approach 1:
The patent changes the measurement parameter from pressure gradient to particle velocity detection. By using a micromechanical vector sensor that measures particle velocity directly, the system achieves directionality without requiring large spatial separations between sensors, thus resolving the contradiction between measurement precision and array size
Solution Approach 2:
The patent replaces the conventional mechanical pressure sensor array with a micromechanical vector sensor that uses vibrating structures to detect particle velocity. This substitution enables compact implementation while maintaining directionality detection capability
2Measurement precision
If accelerometer mass is increased to improve sensitivity at low frequencies, then detection capability improves, but the device becomes prohibitively large
Solution Approach 1:
The patent changes the detection parameter from acceleration to particle velocity. By measuring particle velocity directly through vibrating structures, the system achieves high sensitivity at low frequencies without requiring large test masses, thus resolving the contradiction between sensitivity and device size
Solution Approach 2:
The patent transitions from measuring scalar acceleration to measuring vector particle velocity with directional information. This dimensional change enables compact sensor design while maintaining sensitivity through the use of vibrating structures that respond to velocity rather than acceleration
3Volume of moving object
If micromechanical vector sensors are made compact, then device size is reduced, but deformation measurement becomes too small to detect accurately
Solution Approach 1:
The patent measures particle velocity rather than direct deformation, effectively changing the measurement dimension. The vibrating structures convert particle velocity into measurable displacement at the vibration nodes, enabling accurate detection in compact sensors
Solution Approach 2:
The patent uses mechanical vibration of structured elements to amplify the measurement signal. The vibrating structures resonate at specific frequencies, enhancing the displacement amplitude at vibration nodes to make compact sensor measurements detectable
4Stability of the object's composition
If micromechanical sensors are rigidly mounted for stable measurement, then measurement stability improves, but deployment flexibility is lost
Solution Approach 1:
The patent enables the sensor to serve itself by using the floating base as a natural reference frame. The sensor measures particle velocity relative to the floating base, which moves with the ambient fluid, eliminating the need for rigid external mounting while maintaining measurement stability
Solution Approach 2:
The patent transitions from static rigid mounting to dynamic floating mounting. The floating base adapts to environmental conditions and moves with the fluid, providing a stable reference frame that is inherently adapted to the measurement environment, thus improving both stability and deployment flexibility
Data Source
AI summary
Systems and methods are provided for sensing acoustic signals using a floating base vector sensor. A vector sensor according to an embodiment of the present disclosure can be used to detect and characterize low frequency sound wave(s) in a viscous medium (e.g., air, water, etc.) by detecting a periodic motion of the media particles associated with the sound wave(s). The orientation of the particle velocity deduced from such measurements can provide information regarding the wave vector of the sound wave(s), can define the direction of arrival (DOA) for the acoustic signal, and can assist locating the source of the sound of interest.