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https://www.readbyqxmd.com/read/28538695/a-new-calibration-method-for-commercial-rgb-d-sensors
#1
Walid Darwish, Shenjun Tang, Wenbin Li, Wu Chen
Commercial RGB-D sensors such as Kinect and Structure Sensors have been widely used in the game industry, where geometric fidelity is not of utmost importance. For applications in which high quality 3D is required, i.e., 3D building models of centimeter‑level accuracy, accurate and reliable calibrations of these sensors are required. This paper presents a new model for calibrating the depth measurements of RGB-D sensors based on the structured light concept. Additionally, a new automatic method is proposed for the calibration of all RGB-D parameters, including internal calibration parameters for all cameras, the baseline between the infrared and RGB cameras, and the depth error model...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538686/amorphous-in-ga-zn-o-powder-with-high-gas-selectivity-towards-wide-range-concentration-of-c%C3%A2-h%C3%A2-oh
#2
Hongxiang Chen, Wei Jiang, Lianfeng Zhu, Youwei Yao
Amorphous indium gallium zinc oxide (a-IGZO) powder was prepared by typical solution-based process and post-annealing process. The sample was used as sensor for detecting C₂H₅OH, H₂, and CO. Gas-sensing performance was found to be highly sensitive to C₂H₅OH gas in a wide range of concentration (0.5-1250 ppm) with the response of 2.0 towards 0.5 ppm and 89.2 towards 1250 ppm. Obvious difference of response towards C₂H₅OH, H₂, and CO was found that the response e.g., was 33.20, 6.64, and 2.84 respectively at the concentration of 200 ppm...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538685/the-effect-of-leaf-stacking-on-leaf-reflectance-and-vegetation-indices-measured-by-contact-probe-during-the-season
#3
Eva Neuwirthová, Zuzana Lhotáková, Jana Albrechtová
The aims of the study were: (i) to compare leaf reflectance in visible (VIS) (400-700 nm), near-infrared (NIR) (740-1140 nm) and short-wave infrared (SWIR) (2000-2400 nm) spectral ranges measured monthly by a contact probe on a single leaf and a stack of five leaves (measurement setup (MS)) of two broadleaved tree species during the vegetative season; and (ii) to test if and how selected vegetation indices differ under these two MS. In VIS, the pigment-related spectral region, the effect of MS on reflectance was negligible...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538681/human-thalamic-somatosensory-nucleus-ventral-caudal-vc-as-a-locus-for-stimulation-by-inputs-from-tactile-noxious-and-thermal-sensors-on-an-active-prosthesis
#4
REVIEW
Jui Hong Chien, Anna Korzeniewska, Luana Colloca, Claudia Campbell, Patrick Dougherty, Frederick Lenz
The forebrain somatic sensory locus for input from sensors on the surface of an active prosthesis is an important component of the Brain Machine Interface. We now review the neuronal responses to controlled cutaneous stimuli and the sensations produced by Threshold Stimulation at Microampere current levels (TMIS) in such a locus, the human thalamic Ventral Caudal nucleus (Vc). The responses of these neurons to tactile stimuli mirror those for the corresponding class of tactile mechanoreceptor fiber in the peripheral nerve, and TMIS can evoke sensations like those produced by the stimuli that optimally activate each class...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538680/diazonium-salt-based-surface-enhanced-raman-spectroscopy-nanosensor-detection-and-quantitation-of-aromatic-hydrocarbons-in-water-samples
#5
Inga Tijunelyte, Stéphanie Betelu, Jonathan Moreau, Ioannis Ignatiadis, Catherine Berho, Nathalie Lidgi-Guigui, Erwann Guénin, Catalina David, Sébastien Vergnole, Emmanuel Rinnert, Marc Lamy de la Chapelle
Here, we present a surface-enhanced Raman spectroscopy (SERS) nanosensor for environmental pollutants detection. This study was conducted on three polycyclic aromatic hydrocarbons (PAHs): benzo[a]pyrene (BaP), fluoranthene (FL), and naphthalene (NAP). SERS substrates were chemically functionalized using 4-dodecyl benzenediazonium-tetrafluoroborate and SERS analyses were conducted to detect the pollutants alone and in mixtures. Compounds were first measured in water-methanol (9:1 volume ratio) samples. Investigation on solutions containing concentrations ranging from 10(-6) g L(-1) to 10(-3) g L(-1) provided data to plot calibration curves and to determine the performance of the sensor...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538679/a-simple-drain-current-model-for-mos-transistors-with-the-lorentz-force-effect
#6
Hwang-Cherng Chow, Prasenjit Chatterjee, Wu-Shiung Feng
A novel concept of drain current modelling in rectangular normal MOS transistors with the Lorentz force has been proposed for the first time. The single-drain MOS transistor is qualified as a magnetic sensor. To create the Lorentz force, a DC loop current is applied through an on-chip metal loop around the device, and the relation between the applied loop current and the created magnetic field is assumed to be linear in nature. The drain current of the MOS transistor is reduced with the applied Lorentz force from both directions...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538668/biomechanical-modeling-of-pterygium-radiation-surgery-a-retrospective-case-study
#7
Bojan Pajic, Daniel M Aebersold, Andreas Eggspuehler, Frederik R Theler, Harald P Studer
Pterygium is a vascularized, invasive transformation on the anterior corneal surface that can be treated by Strontium-/Yttrium90 beta irradiation. Finite element modeling was used to analyze the biomechanical effects governing the treatment, and to help understand clinically observed changes in corneal astigmatism. Results suggested that irradiation-induced pulling forces on the anterior corneal surface can cause astigmatism, as well as central corneal flattening. Finite element modeling of corneal biomechanics closely predicted the postoperative corneal surface (astigmatism error -0...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538659/the-effects-of-dithiothreitol-on-dna
#8
Søren Fjelstrup, Marie Bech Andersen, Jonas Thomsen, Jing Wang, Magnus Stougaard, Finn Skou Pedersen, Yi-Ping Ho, Marianne Smedegaard Hede, Birgitta Ruth Knudsen
With the novel possibilities for detecting molecules of interest with extreme sensitivity also comes the risk of encountering hitherto negligible sources of error. In life science, such sources of error might be the broad variety of additives such as dithiothreitol (DTT) used to preserve enzyme stability during in vitro reactions. Using two different assays that can sense strand interruptions in double stranded DNA, we here show that DTT is able to introduce nicks in the DNA backbone. DTT was furthermore shown to facilitate the immobilization of fluorescent DNA on an NHS-ester functionalized glass surface...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538655/thermochemical-humidity-detection-in-harsh-or-non-steady-environments
#9
Devon Bridgeman, Francis Tsow, Xiaojun Xian, Qinan Chang, Yongming Liu, Erica Forzani
We present a new method of chemical quantification utilizing thermal analysis for the detection of relative humidity. By measuring the temperature change of a hydrophilically-modified temperature sensing element vs. a hydrophobically-modified reference element, the total heat from chemical interactions in the sensing element can be measured and used to calculate a change in relative humidity. We have probed the concept by assuming constant temperature streams, and having constant reference humidity (~0% in this case)...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538654/a-monitoring-system-for-laying-hens-that-uses-a-detection-sensor-based-on-infrared-technology-and-image-pattern-recognition
#10
Mauro Zaninelli, Veronica Redaelli, Fabio Luzi, Valentino Bontempo, Vittorio Dell'Orto, Giovanni Savoini
In Italy, organic egg production farms use free-range housing systems with a big outdoor area and a flock of no more than 500 hens. With additional devices and/or farming procedures, the whole flock could be forced to stay in the outdoor area for a limited time of the day. As a consequence, ozone treatments of housing areas could be performed in order to reduce the levels of atmospheric ammonia and bacterial load without risks, due by its toxicity, both for hens and workers. However, an automatic monitoring system, and a sensor able to detect the presence of animals, would be necessary...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538653/development-of-diamond-and-silicon-mems-sensor-arrays-with-integrated-readout-for-vapor-detection
#11
Maira Possas-Abreu, Farbod Ghassemi, Lionel Rousseau, Emmanuel Scorsone, Emilie Descours, Gaelle Lissorgues
This paper reports on the development of an autonomous instrument based on an array of eight resonant microcantilevers for vapor detection. The fabricated sensors are label-free devices, allowing chemical and biological functionalization. In this work, sensors based on an array of silicon and synthetic diamond microcantilevers are sensitized with polymeric films for the detection of analytes. The main advantage of the proposed system is that sensors can be easily changed for another application or for cleaning since the developed gas cell presents removable electrical connections...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28545245/multimodal-bio-inspired-tactile-sensing-module-for-surface-characterization
#12
Thiago Eustaquio Alves de Oliveira, Ana-Maria Cretu, Emil M Petriu
Robots are expected to recognize the properties of objects in order to handle them safely and efficiently in a variety of applications, such as health and elder care, manufacturing, or high-risk environments. This paper explores the issue of surface characterization by monitoring the signals acquired by a novel bio-inspired tactile probe in contact with ridged surfaces. The tactile module comprises a nine Degree of Freedom Microelectromechanical Magnetic, Angular Rate, and Gravity system (9-DOF MEMS MARG) and a deep MEMS pressure sensor embedded in a compliant structure that mimics the function and the organization of mechanoreceptors in human skin as well as the hardness of the human skin...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545239/lora-scalability-a-simulation-model-based-on-interference-measurements
#13
Jetmir Haxhibeqiri, Floris Van den Abeele, Ingrid Moerman, Jeroen Hoebeke
LoRa is a long-range, low power, low bit rate and single-hop wireless communication technology. It is intended to be used in Internet of Things (IoT) applications involving battery-powered devices with low throughput requirements. A LoRaWAN network consists of multiple end nodes that communicate with one or more gateways. These gateways act like a transparent bridge towards a common network server. The amount of end devices and their throughput requirements will have an impact on the performance of the LoRaWAN network...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545236/thermal-characterization-of-dynamic-silicon-cantilever-array-sensors-by-digital-holographic-microscopy
#14
Marjan Zakerin, Antonin Novak, Masaya Toda, Yves Emery, Filipe Natalio, Hans-Jürgen Butt, Rüdiger Berger
In this paper, we apply a digital holographic microscope (DHM) in conjunction with stroboscopic acquisition synchronization. Here, the temperature-dependent decrease of the first resonance frequency (S₁(T)) and Young's elastic modulus (E₁(T)) of silicon micromechanical cantilever sensors (MCSs) are measured. To perform these measurements, the MCSs are uniformly heated from T₀ = 298 K to T = 450 K while being externally actuated with a piezo-actuator in a certain frequency range close to their first resonance frequencies...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545235/a-high-sensitive-pressure-sensor-using-a-single-mode-fiber-embedded-microbubble-with-thin-film-characteristics
#15
Guanjun Wang, Xinglin Liu, Zhiguo Gui, Yongquan An, Jinyu Gu, Meiqin Zhang, Lu Yan, Gao Wang, Zhibin Wang
A new fiber pressure sensor is proposed and analyzed in this paper. A commercial arc fusion splicer and pressure-assisted arc discharge technology are used here to fabricate a silica hollow microbubble from a common glass tube with the characteristics of a thin film. Then the single mode fiber is embedded into the microbubble to form a fiber Fabry-Perot interferometer by measuring the reflected interference spectrum from the fiber tip and microbubble end. As the wall thickness of the micro-bubble can reach up to several micrometers, it can then be used for measuring the outer pressure with high sensitivity...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545232/sensors-and-actuators-on-determining-parameters-for-being-considered-in-selection-of-elastomers-for-biomimetic-hands
#16
Vlad Cârlescu, Dumitru N Olaru, Gheorghe Prisăcaru, Cezar Oprişan, José Machado
In this paper, the authors present a new methodology to study the viscoelastic behaviour of the human finger. The methodology is based on experimental research consisting of a finger's indentation with a small steel cylindrical object for various indentation speeds. The tests were realized on a CETR UMT-2 Tribometer for indentation speed between 0.02 mm/s and 4 mm/s with a normal load of up to 22 N. Using the force-deformation diagrams recorded at the smallest indentation speed determined the elastic modulus of the human finger according to an adapted Hertzian model...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545231/atmospheric-sampling-on-ascension-island-using-multirotor-uavs
#17
Colin Greatwood, Thomas S Richardson, Jim Freer, Rick M Thomas, A Rob MacKenzie, Rebecca Brownlow, David Lowry, Rebecca E Fisher, Euan G Nisbet
As part of an NERC-funded project investigating the southern methane anomaly, a team drawn from the Universities of Bristol, Birmingham and Royal Holloway flew small unmanned multirotors from Ascension Island for the purposes of atmospheric sampling. The objective of these flights was to collect air samples from below, within and above a persistent atmospheric feature, the Trade Wind Inversion, in order to characterise methane concentrations and their isotopic composition. These parameters allow the methane in the different air masses to be tied to different source locations, which can be further analysed using back trajectory atmospheric computer modelling...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545229/an-iterative-distortion-compensation-algorithm-for-camera-calibration-based-on-phase-target
#18
Yongjia Xu, Feng Gao, Hongyu Ren, Zonghua Zhang, Xiangqian Jiang
Camera distortion is a critical factor affecting the accuracy of camera calibration. A conventional calibration approach cannot satisfy the requirement of a measurement system demanding high calibration accuracy due to the inaccurate distortion compensation. This paper presents a novel camera calibration method with an iterative distortion compensation algorithm. The initial parameters of the camera are calibrated by full-field camera pixels and the corresponding points on a phase target. An iterative algorithm is proposed to compensate for the distortion...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545224/natural-inspired-intelligent-visual-computing-and-its-application-to-viticulture
#19
Li Minn Ang, Kah Phooi Seng, Feng Lu Ge
This paper presents an investigation of natural inspired intelligent computing and its corresponding application towards visual information processing systems for viticulture. The paper has three contributions: (1) a review of visual information processing applications for viticulture; (2) the development of natural inspired computing algorithms based on artificial immune system (AIS) techniques for grape berry detection; and (3) the application of the developed algorithms towards real-world grape berry images captured in natural conditions from vineyards in Australia...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28531164/dual-polarization-observations-of-slowly-varying-solar-emissions-from-a-mobile-x-band-radar
#20
Marco Gabella, Andreas Leuenberger
The radio noise that comes from the Sun has been reported in literature as a reference signal to check the quality of dual-polarization weather radar receivers for the S-band and C-band. In most cases, the focus was on relative calibration: horizontal and vertical polarizations were evaluated versus the reference signal mainly in terms of standard deviation of the difference. This means that the investigated radar receivers were able to reproduce the slowly varying component of the microwave signal emitted by the Sun...
May 22, 2017: Sensors
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