公开(公告)号：US20230057869A1

公开(公告)日：2023-02-23

申请号：US17792279

申请日：2020-12-21

Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Nouha ALCHEIKH ,  Sofiane BEN MBAREK ,  Mohammad YOUNIS

IPC: G01R33/028 ,  G01R33/038 ,  B81B7/02

Abstract: A method for measuring a magnetic field with a micro-sensor system includes applying a direct current (ITh) to a curved micro-beam to control a stiffness of the curved micro-beam; placing the micro-sensor system into an external magnetic field (B); selecting with a controller, based on an expected value of the external magnetic field (B), a given resonant frequency of the micro-beam; measuring with a resonant frequency tracking device the given resonant frequency of the micro-beam; and calculating in the controller the external magnetic field (B), based on (1) the measured resonant frequency, (2) the applied current (ITh), and (3) calibration data stored in the controller. The calibration data is indicative of a dependency between a change of the selected resonant frequency and the external magnetic field.

公开(公告)号：US20190383715A1

公开(公告)日：2019-12-19

申请号：US16076049

申请日：2017-03-30

Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Adam BOUCHAALA ,  Nizar JABER ,  Mohammad YOUNIS

IPC: G01N5/02 ,  G01N29/02 ,  G01N29/036

Abstract: Sensors and active switches for applications in gas detection and other fields are described. The devices are based on the softening and hardening nonlinear response behaviors of microelectromechanical systems (MEMS) clamped-clamped microbeams. In that context, embodiments of gas-triggered MEMS microbeam sensors and switches are described. The microbeam devices can be coated with a Metal-Organic Framework to achieve high sensitivity. For gas sensing, an amplitude-based tracking algorithm can be used to quantify an amount of gas captured by the devices according to frequency shift. Noise analysis is also conducted according to the embodiments, which shows that the microbeam devices have high stability against thermal noise. The microbeam devices are also suitable for the generation of binary sensing information for alarming, for example.

公开(公告)号：US20170291811A1

公开(公告)日：2017-10-12

申请号：US15508130

申请日：2015-09-04

Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Mohammad YOUNIS

IPC: B81B7/00 ,  G01P15/125 ,  G02B26/08

CPC classification number: B81B7/008 ,  B81B2201/0235 ,  B81B2201/0271 ,  B81B2201/042 ,  G01P15/125 ,  G01P2015/0862 ,  G02B26/0833 ,  H03H3/0076 ,  H03H9/02259 ,  H03H9/02393 ,  H03H9/467 ,  H03H9/525

Abstract: Embodiments of multi-frequency excitation are described. In various embodiments, a natural frequency of a device may be determined. In turn, a first voltage amplitude and first fixed frequency of a first source of excitation can be selected for the device based on the natural frequency. Additionally, a second voltage amplitude of a second source of excitation can be selected for the device, and the first and second sources of excitation can be applied to the device. After applying the first and second sources of excitation, a frequency of the second source of excitation can be swept. Using the methods of multi-frequency excitation described herein, new operating frequencies, operating frequency ranges, resonance frequencies, resonance frequency ranges, and/or resonance responses can be achieved for devices and systems.