Velocity, acceleration and rotation measurement
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- Physics [4]
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- 2019 [4]
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- Ali Kazemi Nasaban Shotorban [1]
- C. Brousseau [1]
- K. Mahdjoubi [1]
- Kambiz Abedi [1]
- Kian Jafari [1]
- O. Emile [1]
- Qi Sun [1]
- Rongguo Yan [1]
- Weibing Zhao [1]
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Here, a novel optical micro-electro-mechanical systems (MEMS) accelerometer sensor based on a micro-ring resonator and an elliptical disk is proposed. The designed optical MEMS accelerometer is then analysed to obtain its functional characteristics. The proposed optical MEMS sensor presents an optical sensitivity of 0.0025 nm/g, a mechanical sensitivity of 1.56 nm/g, a linear measurement range of ±22 g, a first resonance frequency of 13.02 kHz, and a footprint of 34 μm × 50 μm. Furthermore, the achieved functional characteristics of the proposed accelerometer are compared to several recent contributions in the related field. According to this comparison study, the present optical MEMS accelerometer can be a suitable device for many applications ranging from consumer electronics to inertial measurement units.
Venous leg ulcerations are a common problem, with high prevalence in the middle-aged and elderly population, and more attention on research of their physical activities has been paid, as they have great effects on the blood circulation of the lower limb. With enough, appropriate training, the chronic venous ulcerations in the lower limb can be avoided and alleviated, and venous hypertension can be reduced effectively. The study deals with a physical activity tracking system for the patients based on a three-axis accelerometer. The system uses a three-axis accelerometer, a microcontroller, and a wireless Bluetooth module to form a data acquisition platform to acquire accelerations of the lower limb movement, and sends it to a smart mobile phone via the wireless Bluetooth module. The system takes advantages of the smart mobile phone to guide the chronic venous leg ulcers to do prescribed rehabilitation exercises for the lower limb muscles, perform acceleration data preprocessing, wavelet transform and reconstruction, denoising and feature extraction, obtain the results of the rehabilitation exercises, and then give reasonable evaluation and judgment. It is helpful to treat underlying venous reflux, create such an environment that allows skin to grow across an ulcer, and accelerate ulcer healing process consequently.
A method is presented to improve the determination of the rotational velocity of an on-axis spinning object. It uses the Orbital Angular Momentum (OAM) of an electromagnetic wave at 2.47 GHz, and measures the rotational Doppler frequency shift of a reflected wave. From this shift, the rotational velocity and the direction of rotation can be directly estimated with very good accuracy.
In this chapter, we describe the integration of fibre-optic signal distribution with fibre Bragg gratings (FBG) and microelectromechanical systems (MEMS) actuators to facilitate various miniature tunable fibre-optic devices for applications ranging from fibre lasers, to variable time delay lines for optical signal processing, to the sensing of various physical parameters such as temperature, pressure or acceleration including our own most recent results.
