Sensing Technologies + Applications最新文献_第10页

Multispectral light scattering imaging and multivariate analysis of airborne particulates 大气颗粒物多光谱散射成像及多变量分析

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2177581

S. Holler, Charles R. Skelsey, S. Fuerstenau

{"title":"Multispectral light scattering imaging and multivariate analysis of airborne particulates","authors":"S. Holler, Charles R. Skelsey, S. Fuerstenau","doi":"10.1117/12.2177581","DOIUrl":"https://doi.org/10.1117/12.2177581","url":null,"abstract":"Light scattering patterns from non-spherical particles and aggregates exhibit complex structure that is only revealed when observing in two angular dimensions. However, due to the varied shape and packing of such aerosols, the rich structure in the two-dimensional angular optical scattering (TAOS) pattern varies from particle to particle. We examine two-dimensional light scattering patterns obtained at multiple wavelengths using a single CCD camera with minimal cross talk between channels. The integration of the approach with a single CCD camera assures that data is acquired within the same solid angle and orientation. Since the optical size of the scattering particle is inversely proportional to the illuminating wavelength, the spectrally resolved scattering information provides characteristic information about the airborne particles simultaneously in two different scaling regimes. The simultaneous acquisition of data from airborne particulate matter at two different wavelengths allows for additional degrees of freedom in the analysis and characterization of the aerosols. Whereas our previous multivariate analyses of aerosol particles has relied solely on spatial frequency components, our present approach attempts to incorporate the relative symmetry of the particledetector system while extracting information content from both spectral channels. In addition to single channel data, this current approach also examines relative metrics. Consequently, we have begun to employ multivariate techniques based on novel morphological descriptors in order to classify “unknown” particles within a database of TAOS patterns from known aerosols utilizing both spectral and spatial information acquired. A comparison is made among several different classification metrics, all of which show improved classification capabilities relative to our previous approaches.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117162869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of dynamic thermal effects on durability of optical fiber in the fiber-optic temperature sensor 光纤温度传感器中动态热效应对光纤耐久性的影响

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2176921

A. V. Polyakov

引用次数: 0

Insight into fiber Bragg sensor response at 100-MHz interrogation rates under various dynamic loading conditions 洞察光纤Bragg传感器在各种动态加载条件下的100 mhz询问率响应

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2086707

G. Rodriguez, M. Jaime, C. Mielke, F. Balakirev, A. Azad, R. Sandberg, B. Marshall, B. L. La Lone, B. Henson, L. Smilowitz, M. Marr‐Lyon, Tom Sandoval

{"title":"Insight into fiber Bragg sensor response at 100-MHz interrogation rates under various dynamic loading conditions","authors":"G. Rodriguez, M. Jaime, C. Mielke, F. Balakirev, A. Azad, R. Sandberg, B. Marshall, B. L. La Lone, B. Henson, L. Smilowitz, M. Marr‐Lyon, Tom Sandoval","doi":"10.1117/12.2086707","DOIUrl":"https://doi.org/10.1117/12.2086707","url":null,"abstract":"A 100 MHz fiber Bragg grating (FBG) interrogation system is described and applied to strain, pressure, and shock position sensing. The approach relies on coherent pulse illumination of the FBG sensor with a broadband short pulse from a femtosecond modelocked erbium fiber laser. After interrogation of the FBG sensor, a long multi-kilometer run of single mode fiber was used for chromatic dispersion to temporally stretch the spectral components of the reflected pulse from the FBG sensor. Dynamic strain or pressure induced spectral shifts in the FBG sensor were detected as a pulsed time domain waveform shift after encoding by the chromatic dispersive line. Signals were recorded using a single 35 GHz photodetector and a 25 GHz bandwidth digitizing oscilloscope. Application of this approach to high-speed strain sensing of magnetic materials in pulsed magnetic fields to ~150 T is demonstrated. The FBG wavelength shifts were used to study magnetic field driven magnetostriction effects in LaCoO3. A sub-microsecond temporal shift in the FBG sensor wavelength attached to the sample under first order phase change appears as a fractional length change (strain: ΔL/L<10-4) in the material. A second application to FBG sensing of pressure dynamics to nearly 2 GPa in the thermal ignition of the high explosive PBX-9501 is also demonstrated. Then, as final demonstration, we use a chirped FBG (CFBG) to resolve shock propagation dynamics in 1-D from an explosive detonation that produces fragmentation in an inert confinement vessel. These applications demonstrate the use of this FBG interrogation system in dynamical extreme conditions that would otherwise not be possible using traditional FBG interrogation approaches that are deemed too slow to resolve such events.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132138705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Development of differential absorption lidar (DIAL) for detection of CO2, CH4 and PM in Alberta 差分吸收激光雷达(DIAL)在艾伯塔省检测CO2, CH4和PM的发展

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2176984

M. Wojcik, B. Crowther, R. Lemon, Prasad Valupadas, L. Fu, Bonnie O. Leung, Zheng Yang, Quamrul Huda, A. Chambers

{"title":"Development of differential absorption lidar (DIAL) for detection of CO2, CH4 and PM in Alberta","authors":"M. Wojcik, B. Crowther, R. Lemon, Prasad Valupadas, L. Fu, Bonnie O. Leung, Zheng Yang, Quamrul Huda, A. Chambers","doi":"10.1117/12.2176984","DOIUrl":"https://doi.org/10.1117/12.2176984","url":null,"abstract":"Rapid expansion of the oil and gas industry in Alberta, including the oil sands, has challenged the Alberta Government to keep pace in its efforts to monitor and mitigate the environmental impacts of development. The limitations of current monitoring systems has pushed the provincial government to seek out advanced sensing technologies such as satellite imagery and laser based sensors. The Space Dynamics Laboratory (SDL) of Utah State University, in cooperation with Alberta Environmental Monitoring, Evaluation and Reporting Agency (AEMERA), has developed North America’s first mobile differential absorption lidar (DIAL) system designed specifically for emissions measurement. This instrument is housed inside a 36’ trailer which allows for mobility to travel across Alberta to characterize source emissions and to locate fugitive leaks. DIAL is capable of measuring concentrations for carbon dioxide (CO2) and methane (CH4) at ranges of up to 3 km with a spatial resolution of 10 meters. DIAL can map both CO2 and CH4, as well as particulate matter (PM) in a linear fashion; by scanning the laser beam in both azimuth and elevation DIAL can create images of emissions in two dimensions. DIAL imagery may be used to understand and control production practices, characterize source emissions, determine emission factors, locate fugitive leaks, assess plume dispersion, and confirm air dispersion modeling. A system overview of the DIAL instrument and some representative results will be discussed.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116131457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Experimental determination of terahertz atmospheric absorption parameters 太赫兹大气吸收参数的实验测定

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2176455

David M. Slocum, T. Goyette, R. Giles, W. Nixon

{"title":"Experimental determination of terahertz atmospheric absorption parameters","authors":"David M. Slocum, T. Goyette, R. Giles, W. Nixon","doi":"10.1117/12.2176455","DOIUrl":"https://doi.org/10.1117/12.2176455","url":null,"abstract":"The terahertz frequency regime is often used as the ‘chemical fingerprint’ region of the electromagnetic spectrum since many molecules exhibit a dense selection of rotational and vibrational transitions. Water is a major component of the atmosphere and since it has a large dipole moment the propagation of terahertz radiation will be dominated by atmospheric effects. This study will present the results of high-‐resolution broadband measurements of the terahertz atmospheric absorption and detail the technique for directly measuring the pressure broadening coefficients, absolute absorption coefficients, line positions, and continuum effects. Differences between these measured parameters and those tabulated in HITRAN will be discussed. Once the water vapor absorption was characterized, the same technique was used to measure the line parameters for methanol, a trace gas of interest within Earth’s atmosphere. Methanol has a dense absorption spectrum in the terahertz frequency region and is an important molecule in fields such as environmental monitoring, security, and astrophysics. The data obtained in the present study will be of immediate use for the remote sensing community, as it is uncommon to measure this many independent parameters as well as to measure the absolute absorption of the transitions. Current models rely on tabulated databases of calculated values for the line parameters measured in this study. Differences between the measured data and those in the databases will be highlighted and discussed.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123755643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Terahertz metamaterials for modulation and detection 调制和探测用太赫兹超材料

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2182471

S. Sonkusale, Wangren Xu, S. Rout, Guoqing Fu, Pramod K. Singh

引用次数: 2

High frequency strain measurements with fiber Bragg grating sensors 光纤光栅传感器的高频应变测量

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2183324

J. Koch, M. Angelmahr, W. Schade

{"title":"High frequency strain measurements with fiber Bragg grating sensors","authors":"J. Koch, M. Angelmahr, W. Schade","doi":"10.1117/12.2183324","DOIUrl":"https://doi.org/10.1117/12.2183324","url":null,"abstract":"In recent years fiber Bragg grating sensors gained interest in structural health monitoring and concepts for smart structures. They are small, lightweight, and immune to electromagnetic interference. Using multiplexing techniques, several sensors can be addressed by a single fiber. Therefore, well-established structures and materials in industrial applications can be easily equipped with fiber optical sensors with marginal influence on their mechanical properties. In return, critical components can be monitored in real-time, leading to reduced maintenance intervals and a great reduction of costs. Beside of generally condition monitoring, the localization of failures in a structure is a desired feature of the condition monitoring system. Detecting the acoustic emission of a sudden event, its place of origin can be determined by analyzing the delay time of distributed sensor signals. To achieve high localization accuracies for the detection of cracks, breaks, and impacts high sampling rates combined with the simultaneous interrogation of several fiber Bragg grating sensors are required. In this article a fiber Bragg grating interrogator for high frequency measurements up to the megahertz range is presented. The interrogator is based on a passive wavelength to intensity conversion applying arrayed waveguide gratings. Light power fluctuations are suppressed by a differential data evaluation, leading to a reduced signal-to-noise ratio and a low strain detection limit. The measurement system is used to detect, inter alia, wire breaks in steel wire ropes for dockside cranes.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116526048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Cutting the cord: toward wireless optical intensity interferometry 剪线:走向无线光强干涉测量

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2179146

E. Horch

引用次数: 5

Mathematical modeling of Chikungunya fever control 基孔肯雅热控制的数学建模

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2177066

D. Hincapié-Palacio, J. Ospina

{"title":"Mathematical modeling of Chikungunya fever control","authors":"D. Hincapié-Palacio, J. Ospina","doi":"10.1117/12.2177066","DOIUrl":"https://doi.org/10.1117/12.2177066","url":null,"abstract":"Chikungunya fever is a global concern due to the occurrence of large outbreaks, the presence of persistent arthropathy and its rapid expansion throughout various continents. Globalization and climate change have contributed to the expansion of the geographical areas where mosquitoes Aedes aegypti and Aedes albopictus (Stegomyia) remain. It is necessary to improve the techniques of vector control in the presence of large outbreaks in The American Region. We derive measures of disease control, using a mathematical model of mosquito-human interaction, by means of three scenarios: a) a single vector b) two vectors, c) two vectors and human and non-human reservoirs. The basic reproductive number and critical control measures were deduced by using computer algebra with Maple (Maplesoft Inc, Ontario Canada). Control measures were simulated with parameter values obtained from published data. According to the number of households in high risk areas, the goals of effective vector control to reduce the likelihood of mosquito-human transmission would be established. Besides the two vectors, if presence of other non-human reservoirs were reported, the monthly target of effective elimination of the vector would be approximately double compared to the presence of a single vector. The model shows the need to periodically evaluate the effectiveness of vector control measures.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134187965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

An agent-based mathematical model about carp aggregation 基于智能体的鲤鱼聚集数学模型

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2180323

Yu Liang, Chao Wu

引用次数: 2