A portable and high-resolution optomechanical accelerometer employing a deformable grating-based micro-electro-mechanical system (MEMS) interferometer is presented in this Letter. The movable reflective mirror of realized by low-frequency vertical sensing structure with three-dimensional (3D)-spring construction, which, to the best our knowledge, first proposed fabricated work. All components sensor are packaged metal case compact size 4 cm×6 cm×3.15 cm. micrometer-scale springs permit...

Photovoltaic power generation relies on electronics and therefore does not have natural inertia damping characteristics. In order to make the capacitance of medium time scale participate in grid frequency response without adding additional equipment, this paper takes grid-connected photovoltaic system based DC voltage droop control as research object, establishes static synchronous generator (SSG) model system. The is used analyze main parameters affecting inertia, synchronization...

High-sensitivity accelerometry has historically been employed to explore Earth sciences and advance resource-related industries, such as petroleum exploitation. The devices capable of measurements, however, traditionally involve precise mechanical structures consequent large dimensions. In this article, combined by micromechanical systems grating-assisted interferometry, a closed-loop optical accelerometer with nano-g (ng) sensitivity is developed for microseismic observations. order lower...

Optical sensing techniques are well-known for electromagnetic immunity and thus have been widely considered in high-performance vibration sensors such as accelerometers seismometers. In the progress of miniaturization, however, force feedback control has rarely developed due to associated complexity optical loops. Aiming further explore application interferometry geophysics, a force-rebalanced micro-optics accelerometer is this work. This device operates relying on grating-based MEMS...

A plasma is produced in air by using a high-intensity Q-switch Nd:YAG pulsed laser to irradiate solid target, and the impulses delivering from target are measured at different power densities. Analysing formation process of supported detonation wave (LSDW) fluid mechanics theory Pirri's methods, an approximately theoretical solution impulse under our experimental condition found. Furthermore, according time variation pressure non-equilibrium state, physical model interaction between pulse...

Optical microelectromechanical system (MEMS) devices are often used to measure vibrations with exceedingly small amplitudes, which extensively in acceleration and seismic sensors. However, owing the limitations of sensing principle variation ambient temperature, measurement accuracy dynamic range these optical relatively general. As a solution, this paper presents design an electromagnetic feedback MEMS accelerometer temperature control. Two single chips form structure, assembled via manual...

Abstract The weakly coupled resonators based on mode localization are promising in emerging signal measurement fields due to the verified relative mechanical sensitivity enhancement and exceptional ambient robustness. In this work, we report a novel localized artificial hair sensor for dual-axis air flow sensing. A new full-scale linear output metric differential subtraction of reciprocal amplitude ratios (SRAR) is proposed suppress strong inherent non-linearity ratio-modulated metric....

In this paper, asymmetric biconical fiber tapers (ABFTs) for in-fiber Mach-Zehnder interferometers (IFMZIs) are proposed and analyzed to enhance the interference effect. The ABFT-IFMZIs fabricated, tested, demonstrated in applications of single-frequency (SF) emissions when incorporated into an all-fiber laser cavity as frequency selecting component. comparison with traditional IFMZIs composed all symmetric (SBFTs), higher average transmittance fringe contrast have been ABFT-based IFMZIs....

Concerning on the problem of low measuring precision current micro-inertial sensors, a novel attitude measurement method is proposed to dismiss drift for remarkable error. According output onboard three-axis magnetic sensor in process projectile flight, low-cost detection system designed by using intersection ratio sensor. First, model established. The mathematical relationship between characteristic and pitch angle then derived. Then, solution correction algorithm angles are studied....

Traditional seismometers and gravimeters normally have large volumes entail high manufacturing costs. Aiming at the miniaturization of such geophysical instruments, a portable Micro-electro-mechanical Systems (MEMS) accelerometer applicable to seismic-grade measurements is fabricated characterized in this work. This operating on deformable grating-based MEMS interferometer, where new out-of-plane sensing chip employing double layers 10 μm-thickness spring first proposed. The...

Since the eigenstate-modulated weakly coupled resonators (WCRs) characterize detected signals by measuring amplitude ratios of resonant units, convenient and accurate extraction becomes critical for high-performance applications all mode-localized sensors. This article proposes a modular hybrid measurement control scheme based on automatic to measure systems directly. The one unit is stabilized at constant value gain (AGC), other adopted as an alternative ratios. A micromachined sensor...

The recovery of copper from smelter slag utilizing flotation has been studied. A the Wang Jiaqiao in Yunnan Province china, containing 2.76% Cu, 44.41% Fe, 2.34% Zn and 18.4g/t Ag so on, used .The effective factors such as grinding fineness, pH, dosage type collector were examined. Under flotation condition fineness (90%-74μm), rougher pH 6, XT-53(80 g/t), 2 # oil (30g/t) , grade 23.55 %, 85.61% was obtained. Besides, silver get a 76.2% 143.07g/t associated metals.

Recently, the combination of electronic devices with living insects has been explored to manipulate their crawling or flying, similar manipulable biological actuators. However, investigations controlled flight cessation modulation coleopteran characterized by strong payload capacity have rarely reported thus far. On basis anatomy, this study proposed and validated two separate muscular electrical stimulation protocols stop modulate coleopteran, respectively. The experiment results...

In order to realize the precise control for drive frequency of micro electromechanical system (MEMS) gyroscope, a scheme based on phase locked loop (PLL) was proposed in article. The working principle MEMS gyroscope analyzed which pointed out importance frequency. process with PLL deduced showed that can strictly trace inherent gyroscope. Based analysis, circuit designed and an experiment done. result indicates is able follow time precision 0.62 ppm, 0.09% self-excited scheme. Therefore,...

This paper presents the design, modeling and theoretical analysis of a novel dual-axis hair flow sensor (DHFS) based on mode localization weakly coupled resonators (WCRs). A stereoscopic post is adopted to interact with external fluid transmit air velocity signal. Two-stage micro-leverage mechanisms are designed optimized amplify drag force derived from flow. As main sensitive elements, four WCRs symmetrically distributed around frame. simplified model DHFS established verified by...