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<p>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.</p>

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A 2D omnidirectional inertial switch with multiple thresholds

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月28日

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  • Yousef Algoos,
  • Raed Alahmdi,
  • AlHammam Niyazi,
  • Qiu Xu,
  • Eric Feron,
  • Mohammad I. Younis

摘要

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.