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- 摘要
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- 实验方案
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[IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Design of Compact and Vibration Resistant Receiver for Visible Light Communication Using MEMS mirror
摘要： We propose a compact and vibration-resistant receiver for visible light communication (VLC) between vehicles, where the vibration of the vehicle becomes a barrier for reliable communication. To address this problem, we designed a VLC receiver with a micro mirror, an inertial measurement unit (IMU), and an image sensor. A fast-blinking light is scanned by micro mirror and captured by image sensor efficiently, and the micro mirror controlled by IMU cancels the effect of motion of the vehicle. The performance of the proposed receiver is evaluated in experiments. The obtained results suggest that the proposed receiver is suitable for vibration environment.
关键词： Image sensor,Visible light communication,MEMS scanner mirror
更新于2025-09-04 15:30:14
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[IEEE 2018 1st International Cognitive Cities Conference (IC3) - Okinawa, Japan (2018.8.7-2018.8.9)] 2018 1st International Cognitive Cities Conference (IC3) - A Novel Image Analysis of Light Emitting Diode Array Biostimulation Applied on Microcirculation
摘要： A novel development platform of the specific microcirculation analysis was proposed in this study. This study was to observe the effect of the blood microcirculation with LED stimulation. The experiment involved the light emitting diode array (LEDA), the designed control board and the image processing algorithm on the platform. LEDA (six LEDs, wavelength 660 nm, operating frequency 8 - 15 Hz) was used to stimulate the palm of the subject, and then, the microcirculation images were analyzed by the image processing algorithm. The blood velocity on the ring finger was increased after LEDA stimulation, and it was approximately 1.7 times compared with and without the light stimulation. Thus, LEDA stimulation on the palm enhanced the microcirculation. Also, a specific platform of LEDA system with microcirculation measurement was developed in this study.
关键词： image processing algorithm,microcirculation,light emitting diode array
更新于2025-09-04 15:30:14
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Fast 3D reconstruction of dental cast model based on structured light
摘要： To quickly obtain accurate 3D data of dental cast model, this paper proposes a 3D reconstruction method for dental cast model based on structured light. This method combines the structured light with the motor turntable to obtain a group of 3D data for the dental cast model from multiple angles, and automatically registers the dental 3D data from multiple angles through the ball calibration of turntable. Compared with the real data of the dental cast model, the maximum error of the 3D reconstruction results in this paper is 0.115 mm. The reconstruction time of this process is about 130 s. The experimental results show that the method has high precision and high scanning speed for the 3D reconstruction of the dental cast model.
关键词： ball calibration,structured light,motor turntable,dental cast model,3D reconstruction
更新于2025-09-04 15:30:14
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Rotary photon drag in a Mach-Zehnder-type Sagnac interferometer
摘要： We theoretically investigate rotary photon drag in a Mach-Zehnder type Sagnac interferometer using a four level N-type atomic medium. Splitting of a single pulse of light into two pulses is observed at high strength of the control field both in absorption and dispersion spectra. Group index, relativistic velocities and rotary photon drag are examined as a function of probe field detuning Δp. Rotation angles of ± 2, ± 3, ± 4 and ± 6 micro radians are achieved for the two beams propagating in clockwise and counter clockwise direction by varying values of the probe field detuning as 0γ, 0.5γ and 1.5γ, respectively. The results obtained show potential applications in sensing technology, optical fibre communication technology as well as in perfect lens formation.
关键词： Rotary photon drag,Light propagation,Polarization,Quantum coherence,Interferometry,Electromagnetically induced transparency
更新于2025-09-04 15:30:14
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Distinguishing Refracted Features using Light Field Cameras with Application to Structure from Motion
摘要： To be effective, robots will need to reliably operate in scenes with refractive objects in a variety of applications; however, refractive objects can cause many robotic vision algorithms, such as structure from motion, to become unreliable or even fail. We propose a novel method to distinguish between refracted and Lambertian image features using a light field camera. While previous refracted feature detection methods are limited to light field cameras with large baselines relative to the refractive object, our method achieves comparable performance, and we extend these capabilities to light field cameras with much smaller baselines than previously considered, where we achieve up to 50% higher refracted feature detection rates. Specifically, we propose to use textural cross correlation to characterize apparent feature motion in a single light field, and compare this motion to its Lambertian equivalent based on 4-D light field geometry. For structure from motion, we demonstrate that rejecting refracted features using our distinguisher yields lower reprojection error, lower failure rates, and more accurate pose estimates when the robot is approaching refractive objects. Our method is a critical step toward allowing robots to operate in the presence of refractive objects.
关键词： Computer vision for automation,light fields,computational imaging,visual-based navigation
更新于2025-09-04 15:30:14
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Ultrathin Conductor Enabling Efficient IR Light CO2 Reduction
摘要： Concurrent transformation of carbon dioxide and water into hydrocarbons and oxygen by low-photonic-energy IR light still represents a huge challenge. Here, we design an ultrathin conductor system, in which the special partially occupied band serves as the mediator to simultaneously guarantee IR light harvesting and satisfied band-edge positions, while the ultrathin configuration improves charge separation rates and surface redox kinetics. Taking the low cost and earth abundant CuS as an example, we first fabricate ultrathin CuS layers, where temperature-dependent resistivities, valence-band spectrum and theoretical calculation affirm their metallic nature. Synchrotron-radiation photoelectron and ultraviolet-visible-near infrared spectra unveil metallic CuS atomic layers could realize a new cooperative intraband-interband transition under IR light irradiation, where the generated electrons and holes could simultaneously involve the carbon dioxide reduction and water oxidation reactions. As a result, CuS atomic layers exhibit nearly 100% selective CO production with an evolution rate of 14.5 μmol g-1 h-1 under IR light irradiation, while the catalytic performance shows no obvious decay after 96 h test. Briefly, benefiting from ultrahigh conductivity and unique partially occupied band, the abundant conductor materials such as conducting metal sulfides and metal nitrides hold great promise for applications as effective IR light responsive photocatalysts.
关键词： intraband-interband transition,ultrathin,CO2 reduction,conductor,IR light
更新于2025-09-04 15:30:14
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Catalytic deracemization of chiral allenes by sensitized excitation with visible light
摘要： Chiral compounds exist as enantiomers that are non-superimposable mirror images of each other. Owing to the importance of enantiomerically pure chiral compounds—for example, as active pharmaceutical ingredients—separation of racemates (1:1 mixtures of enantiomers) is extensively performed. Frequently, however, only a single enantiomeric form of a chiral compound is required, which raises the question of how a racemate can be selectively converted into a single enantiomer. Such a deracemization process is entropically disfavoured and cannot be performed by a conventional catalyst in solution. Here we show that it is possible to photochemically deracemize chiral compounds with high enantioselectivity using irradiation with visible light (wavelength of 420 nanometres) in the presence of catalytic quantities (2.5 mole per cent) of a chiral sensitizer. We converted an array of 17 chiral racemic allenes into the respective single enantiomers with 89 to 97 per cent enantiomeric excess. The sensitizer is postulated to operate by triplet energy transfer to the allene, with different energy-transfer efficiencies for the two enantiomers. It thus serves as a unidirectional catalyst that converts one enantiomer but not the other, and the decrease in entropy is compensated by light energy. Photochemical deracemization enables the direct formation of enantiopure materials from a racemic mixture of the same compound, providing a novel approach to the challenge of creating asymmetry.
关键词： chiral sensitizer,triplet energy transfer,deracemization,chiral compounds,visible light,enantiomers,photochemical
更新于2025-09-04 15:30:14
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An Experimental Cell for a Radio Light Receiver
摘要： The problem of creating a receiver for incoherent microwave radiation from sources realized on the basis of ultra-wideband oscillators of chaotic oscillations and objects and surfaces “illuminated” by these sources has been considered. The structure of the device is proposed, the experimental sample is described, and its ability to register sources of incoherent microwave radiation with an integrated output power of ~2 mW at a distance of more than 100 m is shown.
关键词： incoherent microwave radiation,chaotic oscillations,ultra-wideband oscillators,radio light receiver
更新于2025-09-04 15:30:14
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Low Photon Count Phase Retrieval Using Deep Learning
摘要： Imaging systems’ performance at low light intensity is affected by shot noise, which becomes increasingly strong as the power of the light source decreases. In this Letter, we experimentally demonstrate the use of deep neural networks to recover objects illuminated with weak light and demonstrate better performance than with the classical Gerchberg-Saxton phase retrieval algorithm for equivalent signal over noise ratio. The prior contained in the training image set can be leveraged by the deep neural network to detect features with a signal over noise ratio close to one. We apply this principle to a phase retrieval problem and show successful recovery of the object’s most salient features with as little as one photon per detector pixel on average in the illumination beam. We also show that the phase reconstruction is significantly improved by training the neural network with an initial estimate of the object, as opposed to training it with the raw intensity measurement.
关键词： low light,phase retrieval,shot noise,Gerchberg-Saxton algorithm,deep neural networks
更新于2025-09-04 15:30:14
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[IEEE 2018 Pacific Neighborhood Consortium Annual Conference and Joint Meetings (PNC) - San Francisco, CA, USA (2018.10.27-2018.10.30)] 2018 Pacific Neighborhood Consortium Annual Conference and Joint Meetings (PNC) - Robot Indoor Navigation Using Visible Light Communication
摘要： This work developed a robot indoor navigation system using visible light communication (VLC) technique. The movement direction of the robot is followed by the movement control signal transmitted from each VLC LED Lamp. The route planning system calculates the path from the user's location and the destination and the selected points, and based on the user's setting is shortest distance or priority path. The system contains several VLC LED Lamps, a VLC robot, a smart phone with Robot control App, and a server.
关键词： Indoor Navigation,Visible light communication (VLC)
更新于2025-09-04 15:30:14