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Ryad Benosman - One of the best experts on this subject based on the ideXlab platform.

  • neutron induced single event effects on neuromorphic event based vision sensor a first step towards Space Applications
    arXiv: Computer Vision and Pattern Recognition, 2021
    Co-Authors: Seth Roffe, Himanshu Akolkar, Alan D George, B Linaresbarranco, Ryad Benosman
    Abstract:

    This paper studies the suitability of neuromorphic event-based vision cameras for Spaceflight, and the effects of neutron radiation on their performance. Neuromorphic event-based vision cameras are novel sensors that implement asynchronous, clockless data acquisition, providing information about the change in illuminance greater than 120dB with sub-millisecond temporal precision. These sensors have huge potential for Space Applications as they provide an extremely sparse representation of visual dynamics while removing redundant information, thereby conforming to low-resource requirements. An event-based sensor was irradiated under wide-spectrum neutrons at Los Alamos Neutron Science Center and its effects were classified. We found that the sensor had very fast recovery during radiation, showing high correlation of noise event bursts with respect to source macro-pulses. No significant differences were observed between the number of events induced at different angles of incidence but significant differences were found in the spatial structure of noise events at different angles. The results show that event-based cameras are capable of functioning in a Space-like, radiative environment with a signal-to-noise ratio of 3.355. They also show that radiation-induced noise does not affect event-level computation. We also introduce the Event-based Radiation-Induced Noise Simulation Environment (Event-RINSE), a simulation environment based on the noise-modelling we conducted and capable of injecting the effects of radiation-induced noise from the collected data to any stream of events in order to ensure that developed code can operate in a radiative environment. To the best of our knowledge, this is the first time such analysis of neutron-induced noise analysis has been performed on a neuromorphic vision sensor, and this study shows the advantage of using such sensors for Space Applications.

  • neutron induced single event effects on neuromorphic event based vision sensor a first step and tools to Space Applications
    IEEE Access, 2021
    Co-Authors: Seth Roffe, Himanshu Akolkar, Alan D George, B Linaresbarranco, Ryad Benosman
    Abstract:

    This paper studies the suitability of neuromorphic event-based vision cameras for Spaceflight and the effects of neutron radiation on their performance. Neuromorphic event-based vision cameras are novel sensors that implement asynchronous, clockless data acquisition, providing information about the change in illuminance $\ge 120dB$ with sub-millisecond temporal precision. These sensors have huge potential for Space Applications as they provide an extremely sparse representation of visual dynamics while removing redundant information, thereby conforming to low-resource requirements. An event-based sensor was irradiated under wide-spectrum neutrons at Los Alamos Neutron Science Center and its effects were classified. Radiation-induced damage of the sensor under wide-spectrum neutrons was tested, as was the radiative effect on the signal-to-noise ratio of the output at different angles of incidence from the beam source. We found that the sensor had very fast recovery during radiation, showing high correlation of noise event bursts with respect to source macro-pulses. No statistically significant differences were observed between the number of events induced at different angles of incidence but significant differences were found in the spatial structure of noise events at different angles. The results show that event-based cameras are capable of functioning in a Space-like, radiative environment with a signal-to-noise ratio of 3.355. They also show that radiation-induced noise does not affect event-level computation. Finally, we introduce the Event-based Radiation-Induced Noise Simulation Environment (Event-RINSE), a simulation environment based on the noise-modelling we conducted and capable of injecting the effects of radiation-induced noise from the collected data to any stream of events in order to ensure that developed code can operate in a radiative environment. To the best of our knowledge, this is the first time such analysis of neutron-induced noise has been performed on a neuromorphic vision sensor, and this study shows the advantage of using such sensors for Space Applications.

Liping Wang - One of the best experts on this subject based on the ideXlab platform.

  • Carbon-based solid-liquid lubricating coatings for Space Applications-A review
    Friction, 2015
    Co-Authors: Xiaoqiang Fan, Qun J.i. Xue, Liping Wang
    Abstract:

    Despite continuous improvements in machine elements over the past few decades, lubrication issues have impeded human exploration of the universe because single solid or liquid lubrication systems have been unable to satisfy the ever-increasing performance requirements of Space tribology. In this study, we present an overview of the development of carbon-based films as protective coatings, with reference to their high hardness, low friction, and chemical inertness, and with a particular focus on diamond-like carbon (DLC) films. We also discuss the design of carbon-based solid-liquid synergy lubricating coatings with regards to their physicochemical properties and tribological performance. Solid-liquid composite coatings are fabricated via spinning liquid lubricants on solid lubricating films. Such duplex lubricating coatings are considered the most ideal lubrication choice for moving mechanical systems in Space as they can overcome the drawback of adhesion and cold-welding associated with solid films under harsh Space conditions and can minimize the crosslinking or chain scission of liquid lubricants under Space irradiation. State of the art carbon-based solid-liquid synergy lubricating systems therefore holds great promise for Space Applications due to solid/liquid synergies resulting in superior qualities including excellent friction reduction and anti-wear properties as well as strong anti-irradiation capacities, thereby meeting the requirements of high reliability, high precision, high efficiency, and long lifetime for Space drive mechanisms.

  • novel dlc ionic liquid graphene nanocomposite coatings towards high vacuum related Space Applications
    Journal of Materials Chemistry, 2013
    Co-Authors: Xiufang Liu, Jibin Pu, Liping Wang, Qun J.i. Xue
    Abstract:

    It is currently a challenge for Space tribology to develop a long lifetime and high bearing capacity lubricant meeting the requirements of Space Applications. Herein, we dispersed graphene into ionic liquid, prepared novel composite coatings of diamond-like carbon (DLC)/ionic liquid (IL)/graphene with different graphene concentrations, and investigated its Space performance under high vacuum and Space radiation conditions. IL/graphene nanofluids with different concentrations were examined by Fourier transform infrared spectroscopy (FTIR). Furthermore, IL/graphene nanofluids after friction tests were investigated by X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM). The results showed that the graphene concentration would obviously affect the spatial tribology performance of the composite coatings. Because the excess graphene in the IL would tend to form irreversible agglomerates, leading to reduction of the effective graphene dose, an optimum graphene concentration (0.075 mg ml−1) in IL for the composite coatings was required to exhibit the lowest friction coefficient, the highest bearing capacity and the strongest anti-irradiation in a simulated Space environment. In addition, XPS spectra further confirmed that the formation of a fluorinated oil-containing carbon-rich tribofilm between the friction pairs further ensured the good antifriction and wear resistance performance of DLC/IL/graphene.

  • a novel carbon based solid liquid duplex lubricating coating with super high tribological performance for Space Applications
    Surface & Coatings Technology, 2011
    Co-Authors: Liping Wang
    Abstract:

    Abstract In this paper, we presented the fabrication of a carbon-based solid–liquid duplex lubricating coatings and their tribological behaviors and synergy lubrication mechanism under high vacuum condition were investigated. The carbon-based solid–liquid lubricating coating was composed of TiC/a-C:H solid coating as a supporting layer and a liquid lubricating film of MACs (multialkylated cyclopentanes) as upper layer. The friction and wear properties of the solid–liquid duplex coating, the bare TiC/a-C:H film and the MACs-lubricated steel in high vacuum were compared using a high vacuum wear tester. The results showed that the bare TiC/a-C:H solid lubricating films sliding against steel failed quickly at high vacuum condition, while the friction coefficient of the carbon-based solid–liquid duplex coatings sliding against steel ball was kept at a relatively stable value of 0.08 in high vacuum, which was reduced by 43% when compared with MACs-lubricated steel. Moreover, the wear rate of carbon-based solid–liquid lubricating coating was about 1.5 × 10 −8  mm 3 /Nm, which was nearly two orders of magnitude lower than that of the MoS 2 duplex lubricating coating (8.3 × 10 −7  mm 3 /Nm), and about three orders of magnitude lower than that of MACs-lubricated steel (9.27 × 10 −6  mm 3 /Nm). The carbon-based solid–liquid synergy lubrication model was established to explain the much more stable and lower friction as well as long wear life of solid–liquid lubricating coatings. Such carbon-based solid–liquid lubricating coating systems with excellent tribological performance are considered as potential lubricating and protective surfaces for moving mechanical assemblies and tribological components for long-term service in Space Applications.

Nirmala Sikder - One of the best experts on this subject based on the ideXlab platform.

Seth Roffe - One of the best experts on this subject based on the ideXlab platform.

  • neutron induced single event effects on neuromorphic event based vision sensor a first step towards Space Applications
    arXiv: Computer Vision and Pattern Recognition, 2021
    Co-Authors: Seth Roffe, Himanshu Akolkar, Alan D George, B Linaresbarranco, Ryad Benosman
    Abstract:

    This paper studies the suitability of neuromorphic event-based vision cameras for Spaceflight, and the effects of neutron radiation on their performance. Neuromorphic event-based vision cameras are novel sensors that implement asynchronous, clockless data acquisition, providing information about the change in illuminance greater than 120dB with sub-millisecond temporal precision. These sensors have huge potential for Space Applications as they provide an extremely sparse representation of visual dynamics while removing redundant information, thereby conforming to low-resource requirements. An event-based sensor was irradiated under wide-spectrum neutrons at Los Alamos Neutron Science Center and its effects were classified. We found that the sensor had very fast recovery during radiation, showing high correlation of noise event bursts with respect to source macro-pulses. No significant differences were observed between the number of events induced at different angles of incidence but significant differences were found in the spatial structure of noise events at different angles. The results show that event-based cameras are capable of functioning in a Space-like, radiative environment with a signal-to-noise ratio of 3.355. They also show that radiation-induced noise does not affect event-level computation. We also introduce the Event-based Radiation-Induced Noise Simulation Environment (Event-RINSE), a simulation environment based on the noise-modelling we conducted and capable of injecting the effects of radiation-induced noise from the collected data to any stream of events in order to ensure that developed code can operate in a radiative environment. To the best of our knowledge, this is the first time such analysis of neutron-induced noise analysis has been performed on a neuromorphic vision sensor, and this study shows the advantage of using such sensors for Space Applications.

  • neutron induced single event effects on neuromorphic event based vision sensor a first step and tools to Space Applications
    IEEE Access, 2021
    Co-Authors: Seth Roffe, Himanshu Akolkar, Alan D George, B Linaresbarranco, Ryad Benosman
    Abstract:

    This paper studies the suitability of neuromorphic event-based vision cameras for Spaceflight and the effects of neutron radiation on their performance. Neuromorphic event-based vision cameras are novel sensors that implement asynchronous, clockless data acquisition, providing information about the change in illuminance $\ge 120dB$ with sub-millisecond temporal precision. These sensors have huge potential for Space Applications as they provide an extremely sparse representation of visual dynamics while removing redundant information, thereby conforming to low-resource requirements. An event-based sensor was irradiated under wide-spectrum neutrons at Los Alamos Neutron Science Center and its effects were classified. Radiation-induced damage of the sensor under wide-spectrum neutrons was tested, as was the radiative effect on the signal-to-noise ratio of the output at different angles of incidence from the beam source. We found that the sensor had very fast recovery during radiation, showing high correlation of noise event bursts with respect to source macro-pulses. No statistically significant differences were observed between the number of events induced at different angles of incidence but significant differences were found in the spatial structure of noise events at different angles. The results show that event-based cameras are capable of functioning in a Space-like, radiative environment with a signal-to-noise ratio of 3.355. They also show that radiation-induced noise does not affect event-level computation. Finally, we introduce the Event-based Radiation-Induced Noise Simulation Environment (Event-RINSE), a simulation environment based on the noise-modelling we conducted and capable of injecting the effects of radiation-induced noise from the collected data to any stream of events in order to ensure that developed code can operate in a radiative environment. To the best of our knowledge, this is the first time such analysis of neutron-induced noise has been performed on a neuromorphic vision sensor, and this study shows the advantage of using such sensors for Space Applications.

A K Sikder - One of the best experts on this subject based on the ideXlab platform.

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