We present a study of noise suppression by fusion in fiber-optic gyroscopes based on the source-sharing architecture. A theoretical model is proposed for detailed analysis mechanism. The importance modulation parameters revealed, and optimal strategies are given. Through simulations experiments, we demonstrate that scheme not only suppresses self-noise including relative intensity (RIN) thermal phase (TPN), but also achieves complete elimination environmental disturbances. Up to 5.8-fold...

Temperature variation degrades the performance of fiber-optic gyroscopes. In terms a noise mechanism, we report that thermal phase contributes to dominant effect temperature in large gyroscopes when conventional Shupe is basically suppressed. High-order frequency modulation introduced reduce corresponding variation. A time-varying experiment has been carried out for verification. Compared with eigen modulation, sensitivity reduced by 32 times, which effectively enhances adaptability gyroscope.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Design Strategy for Molecular Recognition in Heterogeneous Systems: A Universal Crystal-Face Growth Inhibitor Barium SulfatePeter V. Coveney, Roger Davey, Jonathan L. W. Griffin, Yan He, John D. Hamlin, Stephen Stackhouse, and Andrew WhitingView Author Information Department of Chemistry Chemical Engineering University Manchester Institute Science Technology, P.O. Box 88, Sackville Street Manchester, M60 1QD, U.K. Centre Computational...

<title>Abstract</title> <bold>Background</bold>: There remains a lack of specific instruments tailored to assess disease risk perception among first-degree relatives patients with esophageal cancer. Therefore, this study aimed develop an assessment tool for cancer in China. <bold>Methods</bold>: Using the framework attitudes, we conducted literature review, facilitated discussions within research group, and employed Delphi expert consultation method screen items quantify dimensions...

In the field of precision measurements, highly sensitive interferometric fiber-optic gyroscopes (IFOGs) hold significant value. However, application IFOGs is constrained by intrinsic noise and environmental disturbances. This study conducts a comprehensive analysis based on conventional phase generated carrier (PGC) algorithm. On basis theory, an improved fusion algorithm proposed in conjunction with light source sharing configuration to suppress primary noise-relative intensity (RIN) reduce...

We report a design for gravity gradient measurements based on Sagnac interferometry. A structure with two masses is designed to convert the effect of gradients into rotational motion. interferometry optical fibers introduced probe its The systematic effects are analyzed theoretically and validated by static observation an experimental apparatus. In 37-day record, we achieve noise level <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">...

A high spatial resolution, velocity resolution all-fiber laser Doppler vibrometry (LDV) based on heterodyne detection for vibration measurements is reported. linewidth of 1-kHz single-mode continuous fiber laser, polarization-preserving fiber, and a telescope with 30-mm aperture are used in this LDV. With the inphase-quadrature circuit digital differentiating discriminator, 96.9 nm/s displacement 2.5 pm obtained simultaneously glass attached to piezoceramic transducer. These values...

The calcium terbium aluminate (CaTbAlO4) single crystal was grown by Czochralski method successfully for the first time.The structure of determined X-ray diffraction analysis.The transmission spectrum measured at room temperature wavelength 400-1500nm.The specific Faraday rotation surveyed 532nm, 633nm, and 1064nm respectively.The Verdet constants CaTbAlO4 are calculated results show that around 110% higher than TGG in visible near-infrared spectral region.Therefore,crystal can be promising...

A highly sensitive portable fiber optic gyroscope has significant value in inertial navigation and geophysical exploration. However, the excessive relative intensity noise (RIN) generated by broadband light sources degrades sensitivity of interferometric (IFOG). To suppress RIN, we propose cooperative four-state modulation scheme based on a source-sharing configuration. Reverse-phase square-wave signals are applied to two minimum configurations. The states configuration cooperatively...

Air pollution, particularly particulate matter (PM2.5), is linked to increased depression risk, according a study combining meta-analysis and Mendelian Randomization analysis. The research suggests potential causal relationship between outdoor air pollution exposure mental health disorders, highlighting the need for further investigation into environmental factors contributing depression.

A pulsed coherent Doppler lidar prototype at wavelength of 1064nm was developed to measure windshear in the lower troposphere layer. The laser transmitter an injection-seeded Nd:YAG with pulse energy 0.5mJ, duration 80ns and repetion rate 200Hz. Hard-target speed calibration expriments were carried out demonstrate measurement accuracy 0.23m/s for lidar. Then line-of sight atmosphre wind velocity 500m range 40m resolution implemented. is being optimized 2km away.

A dual-polarization fiber-optic gyroscope with a delay coil is realized. The bias instability reaches 5 × 10 -6 °/h. An earthquake an epicentral distance of 4200 km has been recorded, indicating the ability for precision measurement.

The fiber optic differential interferometer (FODI) is a sensor capable of direct detection temporal derivatives measured physical quantities. However, its phase sensitivity currently constrained by the presence relative intensity noise (RIN). In this study, disruptive effects RIN are evaluated through theoretical analysis. Based on analysis, novel dual-polarization (DP-FODI), in which front-end integrated with new sensing probe, proposed. mechanism for suppression comprehensively elucidated...

The degradation in the accuracy of interferometric fiber optic gyroscopes (IFOGs) complex environments has become a significant limiting factor for their practical applications. In this paper, we introduce novel IFOG configuration based on polarization multiplexing and dual optic-fiber coils. new leverages two orthogonal states within fiber, achieving double length coil. This not only achieves enhancement IFOG’s sensitivity but also effectively compensate suppress errors arising from...

The purpose of this study was to investigate the effects knowledge, attitude, and behavior (KAB) gastrointestinal endoscopy nurses on occupational protection against COVID-19. We analyzed influencing factors KAB provide a reference for training in endoscopic centers. A convenience sample 400 from 26 provinces cities China surveyed using questionnaire determine their about Job title an factor nurses' attitude toward type hospital, whether had received COVID-19, number courses received,...

A fiber optic gyroscope based on dual-polarization configuration's designed and realized. The 24-hour stability test shows a self-noise level of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="mm1" display="inline"> <mml:mrow> <mml:mn>3</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>9</mml:mn> </mml:msup> <mml:mi>r</mml:mi> <mml:mi>a</mml:mi> <mml:mi>d</mml:mi> <mml:mo>/</mml:mo> <mml:mtext>s</mml:mtext> <mml:msqrt>...

Objective To explore a PET probe, 11C-GF120918 in the assessing of function and significance P-glycoprotein (P-gp) breast cancer resistance protein (BCRP) . Methods The mice were injected with chemically synthesized 11C-GF120918. An automatic gamma counter was used to measure radiation intensity various organs at different times dosages. Simultaneously, HPLC employed detect metabolism brain blood mice. The four groups, namely, P-gp knockdown mice, BCRP P-gp/BCRP wild manually detected...