The Experts below are selected from a list of 397116 Experts worldwide ranked by ideXlab platform

Ningfang Song - One of the best experts on this subject based on the ideXlab platform.

  • a compact four axis interferometric fiber optic gyroscope based on multiplexing for Space Application
    Journal of Lightwave Technology, 2020
    Co-Authors: Jing Jin, Ningfang Song, Linghai Kong
    Abstract:

    A compact quad interferometric fiber optic gyroscope (IFOG) is demonstrated for attitude determination in Space Application, which combines efficiently multiplexing technology with redundancy technology. Compared with existing typical three-axis and four-axis systems, the IFOG not only reduces greatly the size, weight, power consumption and cost, but also improves dramatically the reliability. Based on the configuration, a multiplexing modulation method and a control method are proposed. A prototype is manufactured, which achieves the angle random walk of less than 0.025 deg/√h and the bias instability of less than 0.15 deg/h. The weight and power consumption of the prototype are 3.5 times and 2.6 times less than the existing system with roughly the same performance, respectively. The fault injection experiments are conducted and verify that the control method is available for fault recovery.

  • a novel interferometric fiber optic gyroscope with random walk fault diagnosis for Space Application
    Optics and Lasers in Engineering, 2012
    Co-Authors: Jing Jin, Song Lin, Ningfang Song
    Abstract:

    Abstract A novel interferometric fiber optic gyroscope (IFOG) for Space Application is presented. The IFOG is composed of two sources and four independent axes. The sources are shared by all axes to decrease power consumption and save cost. The redundant optical channels and components are applied to eliminate single point failures. A random walk coefficient (RWC) prediction model is developed using a radiation-induced attenuation model of fiber and a RWC expression. Based on the model and the IFOG structure, a failure diagnosis strategy and recovery processing are proposed, and verified by results of radiation tests and fault injection experiments.

Jing Jin - One of the best experts on this subject based on the ideXlab platform.

  • a compact four axis interferometric fiber optic gyroscope based on multiplexing for Space Application
    Journal of Lightwave Technology, 2020
    Co-Authors: Jing Jin, Ningfang Song, Linghai Kong
    Abstract:

    A compact quad interferometric fiber optic gyroscope (IFOG) is demonstrated for attitude determination in Space Application, which combines efficiently multiplexing technology with redundancy technology. Compared with existing typical three-axis and four-axis systems, the IFOG not only reduces greatly the size, weight, power consumption and cost, but also improves dramatically the reliability. Based on the configuration, a multiplexing modulation method and a control method are proposed. A prototype is manufactured, which achieves the angle random walk of less than 0.025 deg/√h and the bias instability of less than 0.15 deg/h. The weight and power consumption of the prototype are 3.5 times and 2.6 times less than the existing system with roughly the same performance, respectively. The fault injection experiments are conducted and verify that the control method is available for fault recovery.

  • a novel interferometric fiber optic gyroscope with random walk fault diagnosis for Space Application
    Optics and Lasers in Engineering, 2012
    Co-Authors: Jing Jin, Song Lin, Ningfang Song
    Abstract:

    Abstract A novel interferometric fiber optic gyroscope (IFOG) for Space Application is presented. The IFOG is composed of two sources and four independent axes. The sources are shared by all axes to decrease power consumption and save cost. The redundant optical channels and components are applied to eliminate single point failures. A random walk coefficient (RWC) prediction model is developed using a radiation-induced attenuation model of fiber and a RWC expression. Based on the model and the IFOG structure, a failure diagnosis strategy and recovery processing are proposed, and verified by results of radiation tests and fault injection experiments.

Linghai Kong - One of the best experts on this subject based on the ideXlab platform.

  • a compact four axis interferometric fiber optic gyroscope based on multiplexing for Space Application
    Journal of Lightwave Technology, 2020
    Co-Authors: Jing Jin, Ningfang Song, Linghai Kong
    Abstract:

    A compact quad interferometric fiber optic gyroscope (IFOG) is demonstrated for attitude determination in Space Application, which combines efficiently multiplexing technology with redundancy technology. Compared with existing typical three-axis and four-axis systems, the IFOG not only reduces greatly the size, weight, power consumption and cost, but also improves dramatically the reliability. Based on the configuration, a multiplexing modulation method and a control method are proposed. A prototype is manufactured, which achieves the angle random walk of less than 0.025 deg/√h and the bias instability of less than 0.15 deg/h. The weight and power consumption of the prototype are 3.5 times and 2.6 times less than the existing system with roughly the same performance, respectively. The fault injection experiments are conducted and verify that the control method is available for fault recovery.

Melissa G Trainer - One of the best experts on this subject based on the ideXlab platform.

  • decomposition of electron ionization mass spectra for Space Application using a monte carlo approach
    Rapid Communications in Mass Spectrometry, 2020
    Co-Authors: Thomas N Gautier, Joseph Serigano, Jeremy Bourgalais, Sarah M Horst, Melissa G Trainer
    Abstract:

    RATIONALE Quadrupole mass spectrometers equipped with an electron ionization (EI) sources have been widely used in Space exploration to investigate the composition of planetary surfaces and atmospheres. However, the complexity of the samples and the minimal calibration for the fragmentation of molecules in the ionization chambers have prevented the deconvolution of the majority of the mass spectra obtained at different targets, thus limiting the determination of the exact composition of the samples analyzed. We propose a Monte-Carlo approach to solve this issue mathematically. METHODS We decomposed simulated mass spectra of mixtures acquired with unit resolving power mass spectrometers and EI sources into the sum of the single components fragmentation patterns weighted by their relative concentration using interior-point least-square fitting. To fit compounds with poorly known fragmentation patterns, we used a Monte-Carlo method to vary the intensity of individual fragment ions. We then decomposed the spectrum thousands of times to obtain a statistical distribution. RESULTS By performing the deconvolution on a mixture of seven different molecules with interfering fragmentation patterns (H2 O, O2 , CH4 , Ar, N2 , C2 H4 , and C2 H6 ) we show that this approach retrieves the mixing ratio of the individual components more accurately than regular mass spectra decomposition methods that rely on fragmentation patterns from general databases. It also provides the probability density function for each species's mixing ratio. CONCLUSIONS By removing the solution degeneracy in the decomposition of mass spectra, the method described herein could significantly increase the scientific retrieval from archived Space flight mass spectrometry data, where calibration of the ionization source is no longer an option.

Dfh Satellite - One of the best experts on this subject based on the ideXlab platform.

  • biomimetic gecko micro nano structure adhesive array in Space Application
    Spacecraft Environment Engineering, 2013
    Co-Authors: Dfh Satellite
    Abstract:

    The gecko adhesive technology that mimics the ability of the gecko to adhere to a target, will be a new way of on-orbit docking. Firstly, the development of on-orbit docking technologies is discussed. The progress made in this domain both in China and abroad is reviewed, including the attachment and detachment mechanism of the biomimetic gecko micro/nano-structure adhesive array and the fabrication methods. Then, various possible Applications of the adhesive array in the Space technology are analyzed. Finally, the key technologies involved are proposed.