In order to meet the requirement of high sensitivity and signal-to-noise ratios (SNR), this study develops optimizes a piezoresistive pressure sensor by using double silicon nanowire (SiNW) as sensing element. First all, ANSYS finite element method voltage noise models are adopted optimize size output (such sensitivity, SNR). As result, released SiNW has 1.2 times more than that single sensor, which is consistent with experimental result. Our result also displays both SNR closely related...

To meet the radiosonde requirement of high sensitivity and linearity, this study designs implements a monolithically integrated array-type piezoresistive intelligent pressure sensor system which is made up two groups four sensors with range 0⁻50 kPa 0⁻100 respectively. First, theoretical models ANSYS (version 14.5, Canonsburg, PA, USA) finite element method (FEM) are adopted to optimize parameters array structure. Combing FEM stress distribution results, size material characteristics...

Optical fiber sensors have numerous advantages and are widely used in several fields. A typical optic Fabry-Perot (FP) sensor is to determine the pressure temperature. To improve sensitivity overcome various limitations of pressure- temperature-sensitive sensors, this study, we demonstrate a micro-pressure FP fabricated on an optical through chemical etching process. graphene diaphragm was as pressure-sensitive membrane. The influence cavity's geometric parameters reflected signal studied...

An optical MEMS pressure sensor based on a mesa-diaphragm is presented. The operating principle of the expatiated by Fabry-Perot (F-P) interference. Both mechanical model and signal averaging effect mesa diaphragm validated simulation, which declares that superior to planar one parallelism can reduce effect. Experimental results demonstrate structure has reasonable linearity sensitivity.

A wavelength-interrogation fiber Fabry-Perot refractive index (RI) sensor based on a sealed in-fiber ellipsoidal cavity is presented. There are two physical cavities in the head: 1) air and 2) silica cavity. The result of simulation shows there only one trough 1510-1590 nm, RI can be measured by tracking wavelength shift, no turning point response characteristic between 1 2 RIU. sensitivity linear range measurement controlled changing cavity's length end's roughness. Experiment results match...

Mechanical properties of silicon nanobeams are prime importance in nanoelectromechanical system applications. A numerical experimental method determining resonant frequencies and Young's modulus by combining finite element analysis frequency response tests based on an electrostatic excitation visual detection using a laser Doppler vibrometer is presented this paper. Silicon nanobeam test structures fabricated from silicon-on-insulator wafers standard lithography anisotropic wet etching...

A novel pressure sensor based on Fabry–Perot interferometry and micro-electromechanical systems (MEMS) technology is proposed demonstrated. basic, simplified technique used to fabricate the sensor, fabrication process packaging configuration are outlined in this paper. The interference of multiple cavities as a whole theoretically analysed simulated. dual-wavelength demodulation method, which can compensate errors independent optical wavelength, demodulate by analysing reflected signals....

We present a highly sensitive refractive index (RI) sensor based on an ultra-compact in-fiber Mach-Zehnder interferometer (MZI) with droplet-shape air-cavity. The dropletshape air-cavity is fabricated by fusion splicing and single-side fused tapering. MZI very short interference arm of ~330μm the taper waist diameter ~40μm. happens between silica-cladding mode air-core mode. trough wavelength specific order in transmission spectrum shifts change surrounding index. experimental results show...

A compact, tunable mid-IR difference-frequency generation (DFG) light source based on a dual-wavelength fiber laser and 5mol% MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal is developed evaluated. An output power of 233 μW achieved with conversion efficiency 0.1%/W. The wavelength can be tuned between 3308 nm 3314 by changing the temperature pair Bragg grating (FBG) taking as cavity mirrors in from 26.5°C to 106.5°C.

The macropore silica colloidal crystal templates were assembled orderly in a capillary glass tube by an applied electric field method to control deposition. In order achieve the photonic band gap (PBG) of optical communication waveband, diameter microspheres is selected Bragg diffraction formula. An experiment was designed test bandgap templates. This paper discusses formation process and close-packed fashion discussed. surface morphology also analyzed. results showed that array...

This paper presents a miniature fiber optic pressure sensor based on Fabry-Perot interference fabricated the tip of single mode (SM) fiber. The measures only 125μm in diameter. A cavity and thin silica diaphragm are by simple techniques involving fusion splicing, cleaving, wet chemical etching. Interference pattern is analyzed issues design discussed. overall reaction etching specifically represented. Pressure testing system carried out. By tracing peak point spectrum, gap length can be...

A novel pressure sensor based on the Fabry-Perot interferometry and microelectromechanical system (MEMS) technology is proposed demonstrated. Light coupled into through a fiber. Dual-wavelength demodulation method used to analyze reflected optical signals compensate errors independent of wavelength. Theoretical analysis simulation results are presented. Experimental for measurements ranging from 0 Mpa 3 demonstrate reasonable linearity sensitivity.

A multiwavelength midinfrared quasi-phase-matched (QPM) difference frequency generation (DFG) scheme is proposed based on a segmented temperature controlling technique for the uniform grating periodically poled lithium niobate (PPLN). The QPM DFG output performances have been investigated under fixed pump and signal wavelength conditions, respectively. Our theoretical results show that when at 1.08 μm, three idler bands, located 3.46, 3.50, 3.57 obtained, where temperatures of PPLN segments...

A novel widely tunable dual-wavelength mid-IR difference frequency generation (DFG) scheme with uniform grating periodically poled lithium niobate (PPLN) is presented in this paper. By using the temperature-dependent dispersion property of PPLN, quasi-phase matching (QPM) peak for pump may evolve into two separate ones and wavelength spacing between them increases decrease crystal temperature. Such QPM peaks allow simultaneous laser radiations while properly setting fundamental wavelengths....

A hybrid-Fabry-Perot (F-P) interferometer based on an in-fiber ellipsoidal cavity is presented, and the refractive index sensing properties are studied. The air-microcavity formed by splicing together a single-mode fiber photonic crystal with special arc-discharge technique. loss analyzed using Gaussian beam model ABCD law, physical of electromagnetic transmission established. According to length ratio, there two kinds influences environment interference fringe: contrast modulation...

With the development of animal husbandry, modern husbandry puts forward higher requirements for site environment. It is necessary to develop a set low-cost, reusable, and networked environmental monitoring systems ensure healthy growth livestock poultry. This study proposes dual-parameter optical fiber sensor composed single-mode cavity an air using fast Fourier transform amplitude demodulation. The fabricated by corrosion fusion, refractive index temperature are investigated experimentally....

This study introduces a porous alumina composite structure, incorporating silver on silicon substrate, to achieve wide range of color displays. The structure utilizes the Bragg interference effect reflect light between surface and pore bottoms. Fabrication involved magnetron sputtering, anodizing, sodium hydroxide etching produce different sizes, depths, film thicknesses. method shifts reflection valleys in spectrum, enabling emission or absorption across various wavelengths, resulting...