Showing 1-25 of 13,873 resultsfor "Index Terms":Absorption Process
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SiC waveguide based all-optical data processing
2018 27th Wireless and Optical Communication Conference (WOCC)
Year: 2018 | Conference Paper |
The SiC waveguide employed to the all-optical data processing is demonstrated by using two-photon absorption induced free-carrier absorption and nonlinear Kerr effect induced refractive index switching. The composition ratio and structure of the SiC material can be detuned to change its nonlinear absorption as well as refractive index. The free-carrier absorption provides a transient pump-to-probe...Show More
Study of Data Processing Based on Differential Optical Absorption Spectroscopy
2008 IEEE Pacific-Asia Workshop on Computational Intelligence and Industrial Application
Year: 2008 | Conference Paper |
Differential optical absorption spectroscopy (DOAS) is widely used to measure trace gases in the atmosphere and flue gas from stationary pollution. The technique is based on the recording of differential absorption, the difference between local maxima and minima in the absorption spectrum of the probed gas species. The key procedures in the retrieval algorithms of the recorded DOAS spectra are the...Show More
Measurement of CH4 by differential infrared optical absorption spectroscopy
2009 9th International Conference on Electronic Measurement & Instruments
Year: 2009 | Conference Paper |
To solve the problem that the current use of optical methods used to detect various gases existing in sensors and signal processing was too complicated, detection sensitivity was not high, detection of the type of gases was single. We used optical phase-shifted grating laser window adjust the differential infrared absorption spectrometry and studied spectrum adjustment and detection signal process...Show More
Broadband and picosecond intraband absorption in lead based colloidal quantum dots
Bram De Geyter;Pieter Geiregat;Yunan Gao;Sybren ten Cate;Arjan J. Houtepen;Juleon M. Schins;Dries Van Thourhout;Laurens D.A. Siebbeles;Zeger Hens
2012 14th International Conference on Transparent Optical Networks (ICTON)
Year: 2012 | Conference Paper |
Using femtosecond transient absorption spectroscopy we demonstrate that lead chalcogenide nanocrystals show efficient, photoinduced absorption (PA) in a broad wavelength range starting just below the bandgap. The time-dependent decay of the PA signal correlates well with the recovery of the band gap absorption. Therefore, the same carriers are involved, which decay with the typical Auger recombina...Show More
Quantitative Detection of SO2 H2S and CS2 Based on Ultraviolet Absorption Spectrometry and Least Squares Algorithm
2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
$SO_{2}, CS_{2}$ and $H_{2}S$ are important decomposition gases of $SF\epsilon$. Their kinds and contents are of great significance for the diagnosis of $SF\epsilon$ gas insulation equipment. In this paper, a method combining UV absorption spectroscopy with least square fitting is proposed for the quantitative calculation of three kinds of $SF\epsilon$ decomposition components. Therefore, we have ...Show More
Power and composition dependent non linear optical switching of TiO2-SiO2 nano composites
S. Divya;Indu Sebastian;V. P. N. Nampoori;P. Radhakrishnan;A. Mujeeb
2012 International Conference on Optical Engineering (ICOE)
Year: 2012 | Conference Paper |
Linear as well as nonlinear absorption of TiO2-SiO2 nanocomposites prepared by sol gel process has been reported. To investigate the nonlinear properties, Z Scan technique was employed with 532 nm as the excitation wavelength followed by the calculation of the nonlinear optical constants. Z-scan experiments showed that when the excitation energy increased, the nonlinear absorption of the nanocompo...Show More
Absorptive capacity of information technology and its conceptual model
Tsinghua Science and Technology
Cited by: Papers (1)
In order to examine the problem of how to improve the use of information technology (IT) in enterprises, this paper makes an exploration from the perspective of organizational absorptive capacity. We propose the concept of IT absorptive capacity from an organizational level. A dynamic process model is developed to further analyze IT absorption. IT absorptive capacity of this process is embodied as...Show More
Nonlinear Absorption at Optical Telecommunication Wavelengths of InN Films Deposited by RF Sputtering
Sirona Valdueza-Felip;Laura Monteagudo-Lerma;Juliette Mangeney;Miguel Gonzalez-Herraez;François H. Julien;Fernando B. Naranjo
IEEE Photonics Technology Letters
Cited by: Papers (4)
We report on the nonlinear optical absorption of InN films deposited on GaN templates by radio-frequency (RF) sputtering. The layers are characterized through the pump-probe technique at 1.55 μm, by obtaining a nonlinear absorption coefficient of 167±30 cm/GW with a nonlinear response recovery time of 380 fs. This nonlinear behavior is attributed to a two-photon absorption process followed by a fr...Show More
Fractal Approach to Sound Absorption Behavior in Nonwoven
2010 International Conference on Artificial Intelligence and Computational Intelligence
Year: 2010 | Conference Paper |
Cited by: Papers (3)
Sound absorption property in nonwovens requires specifying relationship with structural characteristic. Fractal approach seems to be a potentially useful tool to describe hierarchical systems and is suitable to link the structure and acoustic properties of nonwovens. In this paper, the pore area fractal dimension of nonwoven is calculated, and the sound absorbing behavior of nonwoven is measured. ...Show More
We have proposed and theoretically analyzed nonmetallic broadband visible-light absorbers based on alternating SiO2/InAs thin films on SiO2 substrate. Compared with the conventional absorbers, the proposed SiO2/InAs structure can achieve excellent absorption within a smaller volume. The average absorption can exceed 97% in the wavelength range of 300–850 nm. With a two-dimensional InAs grating ato...Show More
Measurement of the thermal absorption cross section in lucite using fermi age theory
Rene G. Sanchez;David K. Hayes;Travis J. Grove;Jesson D. Hutchinson;Jennifer J. Ong;Fredrik K. Tovesson
2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications
Year: 2009 | Conference Paper |
The diffusion processes of neutrons in Lucite have been investigated. The mechanisms of these processes have been described as having two steps. In the first step, the fast neutrons collide with the nuclei of Lucite, losing energy until they reach thermal energies, In the second step of the diffusion process, the thermal neutrons continue to diffuse through the Lucite without any significant loss ...Show More
Ultrafast Photonic Logic Gates with Organic Chromophore Molecules
2023 IEEE Workshop on Recent Advances in Photonics (WRAP)
Year: 2023 | Conference Paper |
Ultrafast reverse saturable absorption has been analyzed in detail in chromophore-based borondipyrromethenes (BODIPYs) derivatives with femtosecond (fs) laser pulses at 800 nm and 850 nm. The effect of pulse intensity, pulse-width, thickness, concentration, nonlinear absorption coefficients and laser pulse shaping on transmittance has been studied and optimized for the all-optical switching in rec...Show More
Investigation of InGaAsP Quantum-Well EAM Based Pump-Probe Configuration for Ultrafast Optical Signal Processing
Bingbing Wu;Yuanbing Cheng;Songnian Fu;Jian Wu;Chen Yao;Shile Wei;Lanlan Li;Yitang Dai;Ping Shum
A comprehensive theoretical model for analyzing both static and dynamic properties of arbitrary composition ${\rm In}_{1-x}{\rm Ga}_{x}{\rm As}_{y}{\rm P}_{1-y}$ quantum-well (QW) electro-absorption modulator (EAM) is proposed. Optical absorption spectra of the QW-EAM considering both excitonic transitions and continuum conduction-band to valence-band transitions are included to evaluate the QW-EA...Show More
Nonlinear Absorption of Terahertz Radiation in Semiconductor Heterojunctions
Conference on Optoelectronic and Microelectronic Materials and Devices, 2004.
Year: 2004 | Conference Paper |
By considering multiple photon process and conduction-valence interband impact ionization (II), we have calculated nonlinear free-carrier absorption of terahertz radiation in InAs/AlSb heterojunctions. It is shown that (i) electron-disorder scatterings are important at low to intermediate field, and (ii) most importantly, the high field absorption is dominated by II processes. The calculated resul...Show More
Temperature influence over the absorption process of CO2 in octane
2015 Conference Grid, Cloud & High Performance Computing in Science (ROLCG)
Year: 2015 | Conference Paper |
Cited by: Papers (1)
The paper presents a solution for modeling and simulation of the CO2 absorption process in octane. In this approach, the main input signal is considered the temperature at which the absorption phenomenon takes place. Also, the absorption process is treated as a non-linear process, the proposed mathematical model being an original one. In order to simulate the evolution in time of the absorbed CO2 ...Show More
Improved Hardness of Single-Crystal ${\rm Nd}^{3+}:{\rm YAG}$ to Ionizing Radiation via Co-Doping with ${\rm Cr}^{3+}$
Boris L. Glebov;Kelly Simmons-Potter;Brian P. Fox;Dorothy C. Meister
The proliferation of optical elements in systems that are subject to harsh ionizing radiation environments prompts the need for commercially available radiation-hard materials, such as laser materials. In the present study, changes in the material optical absorption are compared for a suite of single-crystal YAG, Nd3+:YAG, and Cr3+,Nd3+:YAG laser materials in response to high-dose-rate gamma radia...Show More
Research on On-line Detection Method and Device Development of HF and Micro Water Content with Optical Image Processing
2022 7th International Conference on Image, Vision and Computing (ICIVC)
Year: 2022 | Conference Paper |
In this paper, the infrared absorption spectrum characteristics of H2O and HF are studied in detail. The subsequent experimental research is carried out at the wave number of 1392nm for H2O and 1278nm for HF. A spectral analysis system based on the FTIR infrared spectrometer is established to study the spectral absorption characteristics of H2O and HF with temperature and pressure. The TDLAS exper...Show More
Fabrication and characterization of solution-processed perovskite photodetector
Aditi Upadhyaya;Chandra Mohan Singh Negi;Ajay Singh Verma;Saral K Gupta
2018 3rd International Conference on Microwave and Photonics (ICMAP)
Year: 2018 | Conference Paper |
The present study reports Perovskite nanoparticles as active layer in solution processed photodetector. Perovskite nanoparticles (CHjNHPbLj) were synthesized by chemical route and their properties were investigated by UV-Vis absorption spectroscopy and field emission scanning electron microscopy measurements. The dark current-voltage characteristics of the device exhibit rectifying behavior. Photo...Show More
Estimation of gel fraction of polyethylene cross-linked with silane by far-infrared absorption spectroscopy
Far-infrared absorption spectra were measured for low density polyethylene in a frequency range from 3.0 to 120 THz. When the polyethylene was cross-linked using vinyl silane, the absorption was found to increase in proportion to the cross-linking degree at 13.2, 30.9, and 32.7 THz, where absorption attributable to Si-O bonds appears. Therefore, the degree of cross-linking of polyethylene by vinyl...Show More
Study on Computer Simulation Prediction of the Feasibility of Heme Determination of Pb
Xiaofeng Wang;Wenbo Lan;Liping He;Binbin Wang;Yuzhu Wang;Liping Wang;Zhijian Bu;Jianhuang Li;Yanbin Meng;Changming Nie
2022 7th International Conference on Intelligent Computing and Signal Processing (ICSP)
Year: 2022 | Conference Paper |
In order to explore why heme can be used for the determination of lead, the central iron atom (Fe) of heme was replaced with lead atom (Pb). The structural characteristics and spectral characteristics of the molecules before and after the substitution, as well as the binding ability of the heme ligand to the central atom and the stability of the formed complex were compared. The results show that ...Show More
Process integration and operation optimization of Absorption-Stabilization System
2011 International Conference on Materials for Renewable Energy & Environment
Year: 2011 | Conference Paper |
More emission of high-value C3/C3+ components and higher energy consumption has been troubling the Absorption-Stabilization System in an oil refinery. In this paper, a brand-new process and operation case has been suggested based on the process integration, resulting significant energy save and C3/C3+ recovery. Where, the condensed oil tank to be operated in higher temperature; the stripper to be ...Show More
Design of Ultra-Broadband Metamaterial Absorber from Infrared to Terahertz
Xiangze Liu;Wenbin Zhou;Tiantian Shi;Yiming Liao;Feng Yan;Xiaoli Ji
2024 IEEE 17th International Conference on Solid-State & Integrated Circuit Technology (ICSICT)
Year: 2024 | Conference Paper |
Microbolometers can operate in the infrared to terahertz regions and have important applications in high-definition imaging, temperature measurement, and ranging. However, these detectors face technical bottlenecks in the transition region from farinfrared to terahertz, such as weak spectral absorption capability, narrow bandwidth, and manufacturing difficulties. This paper designs a metamaterial ...Show More
Signal processing method of ambient trace-gas monitoring with tunable diode laser absorption spectroscopy
2009 IEEE Youth Conference on Information, Computing and Telecommunication
Year: 2009 | Conference Paper |
Tunable diode laser absorption spectroscopy (TDLAS) is a new method to detect trace-gas qualitatively or quantificationally based on the scan characteristic of the diode laser to obtain the absorption spectroscopy in the characteristic absorption region. It needs to combine with a long absorption path in the ambient trace-gas measurements. TDLAS has a significant advantage not only in sensitivity ...Show More
Nonlinear Organic Liquid-Cored Fiber Array for All-Optical Switching and Sensor Protection Against Short-Pulsed Lasers
A nonlinear fiber array capable of large-field-of-view visible image transmission and all-optical switching of subnano and nanoseconds laser pulses is described. The transparent fiber core liquid is found to possess large effective nonlinear absorption coefficients arising from two-photon and excited state absorptions. These multiphoton absorption characteristics are further enhanced by the fiber ...Show More
Mid-Infrared Absorption Spectroscopy for Gas Sensing and Application
Yiding Wang;Kaiyuan Zheng;Fang Song;Frank K. Tittel;Chuantao Zheng
2020 IEEE 5th Optoelectronics Global Conference (OGC)
Year: 2020 | Conference Paper |
Cited by: Papers (3)
Gas sensors play an important role in many applications ranging from chemical processing analysis, medical diagnostics to atmospheric pollution monitoring. The application of sensitive mid-infrared (MIR) absorption spectroscopy technique was reported for multiple gas detection, including methane (CH4), carbon monoxide (CO) and carbon dioxide (CO2). With respect to CH4 detection, a direct laser abs...Show More
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- NIST
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- calibration
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- combined standard uncertainty $(\mathbf{u}_{\mathbf{c}})$
- containerized source
- conventional true value
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- efficiency
- field conditions
- field of view (FOV)
- full-energy peak
- high energy
- in-situ measurement
- infinite half-space
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