Sensing Technologies + Applications最新文献_第9页

Growth and morphology of lead tin selenide for MWIR detectors 用于MWIR探测器的硒化铅锡的生长和形貌

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2179724

Christopher E. Cooper, Pietro Strobbia, Emily Schultheis, N. Prasad, B. Arnold, F. Choa, N. Singh

引用次数: 4

Fiber optic anemometer based on silicon Fabry-Pérot interferometer 基于硅法布里-普氏干涉仪的光纤风速计

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2180258

Guigen Liu, W. Hou, W. Qiao, M. Han

{"title":"Fiber optic anemometer based on silicon Fabry-Pérot interferometer","authors":"Guigen Liu, W. Hou, W. Qiao, M. Han","doi":"10.1117/12.2180258","DOIUrl":"https://doi.org/10.1117/12.2180258","url":null,"abstract":"Flowmeters have been finding vast applications in all kinds of industrial processes, such as process control, food quality surveillance, wind turbines, environment monitoring, etc. In this paper, we propose a new anemometer which consists of a Fabry-Pérot interferometer (FPI) implemented using a thin silicon mounted on the tip of an optical fiber. The anemometer takes advantage of the superior thermal and optical properties of silicon. Silicon is transparent to infrared wavelength, while it absorbs visible light. Thus, the silicon FPI can be heated by a beam injected from a red diode laser while the infrared signals go through it without any interference from the heating light. The heat loss from the silicon film will increase when the sensor is placed in stronger flow (wind), which induces a decrease in the optical path of the silicon FPI, which lead to blueshifts the output spectrum. A higher wind speed corresponds to a larger wavelength shift. By tuning the heating power, the response range and sensitivity of the anemometer is changed. Experimental results demonstrate that a wavelength shift -0.574 nm was observed for a wind speed of 4 m/s. Better sensitivity is to be expected when stronger heating applied. The proposed sensor also features simple structure, low cost and fast response.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"44 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":"127595730","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: 1

Chemical agent registration method on the basis of surface optical sensitization and surface plasmon resonance 基于表面光敏和表面等离子体共振的化学药剂配准方法

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2176765

S. Vinogradov, M. Kononov

引用次数: 0

MCT as sub-terahertz and infrared detector MCT是次太赫兹和红外探测器

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2176854

F. Sizov, V. Zabudsky, S. Dvoretsky, Vladimir A. Petryiakov, A. Golenkov, K. Andreyeva, Z. Tsybrii, A. Shevchik-Shekera, E. Dieguez

引用次数: 3

Gun muzzle flash detection using a single photon avalanche diode array in 0.18µm CMOS technology 使用0.18µm CMOS技术的单光子雪崩二极管阵列进行枪口闪光检测

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2180334

V. Savuskan, Claudio Jakobson, Tomer Merhav, A. Shoham, I. Brouk, Y. Nemirovsky

{"title":"Gun muzzle flash detection using a single photon avalanche diode array in 0.18µm CMOS technology","authors":"V. Savuskan, Claudio Jakobson, Tomer Merhav, A. Shoham, I. Brouk, Y. Nemirovsky","doi":"10.1117/12.2180334","DOIUrl":"https://doi.org/10.1117/12.2180334","url":null,"abstract":"In this study, a CMOS Single Photon Avalanche Diode (SPAD) 2D array is used to record and sample muzzle flash events in the visible spectrum, from representative weapons. SPADs detect the emission peaks of alkali salts, potassium or sodium, with spectral emission lines around 769nm and 589nm, respectively. The alkali salts are included in the gunpowder to suppress secondary flashes ignited during the muzzle flash event. The SPADs possess two crucial properties for muzzle flash imaging: (i) very high photon detection sensitivity, (ii) a unique ability to convert the optical signal to a digital signal at the source pixel, thus practically eliminating readout noise. The sole noise sources are the ones prior to the readout circuitry (optical signal distribution, avalanche initiation distribution and nonphotonic generation). This enables high sampling frequencies in the kilohertz range without significant SNR degradation, in contrast to regular CMOS image sensors. This research will demonstrate the SPAD’s ability to accurately sample and reconstruct the temporal behavior of the muzzle flash in the visible wavelength, in the presence of sunlight. The reconstructed signal is clearly distinguishable from background clutter, through exploitation of flash temporal characteristics and signal processing, which will be reported. The frame rate of ~16 KHz was chosen as an optimum between SNR degradation and temporal profile recognition accuracy. In contrast to a single SPAD, the 2D array allows for multiple events to be processed simultaneously. Moreover, a significant field of view is covered, enabling comprehensive surveillance and imaging.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"146 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":"133864323","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

Imaging through turbid media via sparse representation: imaging quality comparison of three projection matrices 稀疏表示浑浊介质成像:三种投影矩阵成像质量比较

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2176733

Xiaopeng Shao, Huijuan Li, Tengfei Wu, Weijia Dai, Xiangli Bi

{"title":"Imaging through turbid media via sparse representation: imaging quality comparison of three projection matrices","authors":"Xiaopeng Shao, Huijuan Li, Tengfei Wu, Weijia Dai, Xiangli Bi","doi":"10.1117/12.2176733","DOIUrl":"https://doi.org/10.1117/12.2176733","url":null,"abstract":"The incident light will be scattered away due to the inhomogeneity of the refractive index in many materials which will greatly reduce the imaging depth and degrade the imaging quality. Many exciting methods have been presented in recent years for solving this problem and realizing imaging through a highly scattering medium, such as the wavefront modulation technique and reconstruction technique. The imaging method based on compressed sensing (CS) theory can decrease the computational complexity because it doesn't require the whole speckle pattern to realize reconstruction. One of the key premises of this method is that the object is sparse or can be sparse representation. However, choosing a proper projection matrix is very important to the imaging quality. In this paper, we analyzed that the transmission matrix (TM) of a scattering medium obeys circular Gaussian distribution, which makes it possible that a scattering medium can be used as the measurement matrix in the CS theory. In order to verify the performance of this method, a whole optical system is simulated. Various projection matrices are introduced to make the object sparse, including the fast Fourier transform (FFT) basis, the discrete cosine transform (DCT) basis and the discrete wavelet transform (DWT) basis, the imaging performances of each of which are compared comprehensively. Simulation results show that for most targets, applying the discrete wavelet transform basis will obtain an image in good quality. This work can be applied to biomedical imaging and used to develop real-time imaging through highly scattering media.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"41 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":"134312297","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

Growth dependent optical properties of ZnMgO at THz frequencies 太赫兹频率下氧化锌（ZnMgO）随生长变化的光学特性

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2182838

A. Rivera, A. Mazady, Kiarash Ahi, M. Anwar

{"title":"Growth dependent optical properties of ZnMgO at THz frequencies","authors":"A. Rivera, A. Mazady, Kiarash Ahi, M. Anwar","doi":"10.1117/12.2182838","DOIUrl":"https://doi.org/10.1117/12.2182838","url":null,"abstract":"A relatively high Mg mole fraction of 7% is achieved using the cavitation effect under sonication to overcome the low solubility of ZnO-MgO at low temperature. The Mg mole fraction is confirmed by shift in the near band emission of free exciton under photoluminescence spectroscopy at room temperature. The x-ray diffraction pattern has a large peak associated to ZnO (002) from which the c-lattice constant is calculated to be 5.1967Ǻ. The nanorods (NRs) grown via sonochemical are compared to nanowires (NWs) grown using metal organic chemical vapor deposition (MOCVD) and hydrothermal synthesis. Also, the effect of the ZnO film used as seed layer is described and compare to a simple spin coated layer. Terahertz (THz) index of refraction and dielectric constant of wurtzite Zn1-xMgxO NWs with Mg mole fraction of 7% via sonochemical are determined using THz time domain spectroscopy (THz-TDS). The results are compared with ZnO and ZnMgO NWs with 10% Mg mole fraction grown using MOCVD. The successful growth of Zn1-xMgxO with wurtzite structure at low temperature permits realization of the growth of heterostructures, quantum well, nanowires and nanorods on flexible substrates providing lower cost, optical and carrier confinement necessary in advanced light emitting diodes (LEDs), laser diodes (LDs) and high efficiency solar cells.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"25 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":"131530389","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: 4

3D noninvasive, high-resolution imaging using a photoacoustic tomography (PAT) system and rapid wavelength-cycling lasers 三维无创，高分辨率成像使用光声断层扫描(PAT)系统和快速波长循环激光器

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2177602

A. Sampathkumar, D. Gross, M. Klosner, Gary Chan, C. Wu, D. Heller

{"title":"3D noninvasive, high-resolution imaging using a photoacoustic tomography (PAT) system and rapid wavelength-cycling lasers","authors":"A. Sampathkumar, D. Gross, M. Klosner, Gary Chan, C. Wu, D. Heller","doi":"10.1117/12.2177602","DOIUrl":"https://doi.org/10.1117/12.2177602","url":null,"abstract":"Globally, cancer is a major health issue as advances in modern medicine continue to extend the human life span. Breast cancer ranks second as a cause of cancer death in women in the United States. Photoacoustic (PA) imaging (PAI) provides high molecular contrast at greater depths in tissue without the use of ionizing radiation. In this work, we describe the development of a PA tomography (PAT) system and a rapid wavelength-cycling Alexandrite laser designed for clinical PAI applications. The laser produces 450 mJ/pulse at 25 Hz to illuminate the entire breast, which eliminates the need to scan the laser source. Wavelength cycling provides a pulse sequence in which the output wavelength repeatedly alternates between 755 nm and 797 nm rapidly within milliseconds. We present imaging results of breast phantoms with inclusions of different sizes at varying depths, obtained with this laser source, a 5-MHz 128-element transducer and a 128-channel Verasonics system. Results include PA images and 3D reconstruction of the breast phantom at 755 and 797 nm, delineating the inclusions that mimic tumors in the breast.","PeriodicalId":438348,"journal":{"name":"Sensing Technologies + Applications","volume":"51 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":"132620829","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

The Ad5 [E1-, E2b-]-based vector: a new and versatile gene delivery platform 基于Ad5 [E1-， E2b-]的载体:一种新的多功能基因传递平台

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2183244

F. Jones, E. Gabitzsch, J. Balint

引用次数: 0

Near-infrared absorption fiber-optic sensors for ultra-sensitive CO2 detection 用于超灵敏二氧化碳探测的近红外吸收光纤传感器

Sensing Technologies + Applications Pub Date : 2015-05-13 DOI: 10.1117/12.2178072

Xinyuan Chong, Ki-Joong Kim, P. Ohodnicki, Chih-hung Chang, Alan X. Wang

引用次数: 0