ArticleScientific reports2025
A 2D omnidirectional inertial switch with multiple thresholds.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We introduce a novel 2D omnidirectional inertial switch designed to detect multiple acceleration thresholds that extends the capabilities of existing omnidirectional switches with a single threshold. The device was fabricated using the SOIMUMPs process and enhanced with in-house gold sputtering to increase conductivity. The switch incorporates a suspended proof mass and stationary electrodes to uniformly sense shock-induced displacements from any planar direction. Finite Element Analysis (FEA) was used to optimize the design for uniform stiffness and precise threshold detection across all axial and off-axial planar directions. Testing was conducted using a drop-table system, assessing directional thresholds within the device plane at 15° increments around the full 360°. The results showed average first and second thresholds of 30 ɡ and 100 ɡ, respectively, with maximum variations across the angle increments of 2 ɡ for the first threshold and 5 ɡ for the second threshold. This new inertial switch represents a significant enhancement of omnidirectional sensitivity, making it particularly valuable for triggering applications in essential health and safety monitoring.
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