Charge coupled device (Total 1319434 Papers Found)

The description and development are described of a multidimensional continuous wavelet transform for synthetic aperture radar (SAR) image analysis, especially for the analysis of ‘dispersive’ reflectors located on a ground illuminated by a SAR. The usual imaging process makes the assumption that the reflectors are isotropic (i.e. that they behave the same way regardless of the angle from which they are viewed) and white (they have the same properties within the emitted frequency bandwidth). ...
We have built an 80-mega pixels (10240×8192) mosaic CCD camera, called Suprime-Cam, for the widefield prime focus of the 8.2 m Subaru telescope. Suprime-Cam covers a field of view 34’×27’, a unique facility among the the 8-10 m class telescopes, with a resolution of 0.”202 per pixel. The focal plane consists of ten high-resistivity 2k×4k CCDs developed by MIT Lincoln Laboratory, which are cooled by a large stirling-cycle cooler. The CCD readout electronics was designed to be scalable, w ...
In this report we present a new calibration technique for off-the-shelf CCD cameras and acquisition systems. The estimated camera model includes 6 extrinsic and up to 8 intrinsic model parameters including radial and tangential distortion. Also an inverse distortion function for correction of distortion effects can be estimated. Planar and non-planar objects can be used as previously measured calibration targets. The method is suitable for single image and multiple image input datasets. Tools fo ...
A complete sample of 659 field galaxies with 17.0<U≤21.1, each with U-B-VR-I7500-I8600 photometry, has been selected from a deep field survey which covers 0.83 deg2 along six lines of sight (Hall et al. 1996a). Each galaxy’s spectral type and redshift has been estimated using a multicolor photometric technique (Liu & Green 1998). Total number counts of the galaxies in the U-band give a count slope d(logN)/dM = 0.55 ± 0.05, consistent with previous studies. The 545 galaxies in the sample ...
Abstract— In this paper we present a broadband matching technique for the design of low noise amplifiers. This technique is based on the use of coupled lines filters and quarter wave transformers for the adaptation and stabilization of these amplifiers, presenting the theory and the design process of these circuits. The type of transistors used for modeling this amplifier is the HEMT of Alpha Industries. The results we found show that this amplifier is unconditionally stable with a satisfactor ...
The low dispersion STIS spectrophotometric flux calibration must account for all instrumental non-linearities and all changes in sensitivity with time and temperature. An empirical algorithm for CCD Charge Transfer Efficiency (CTE) is presented along with the wavelength dependent sensitivity changes. Precise STIS spectrophotometry includes corrections for CTE losses as large as 20% for faint signals and low sky, for MAMA non-linearities of ∼ 2%, and for loss in system throughput that currently ...
Delta-doped CCDs have achieved stable quantum efficiency, at the theoretical limit imposed by reflection from the Si surface in the near UV and visible. In this approach, an epitaxial silicon layer is grown on a fully-processed CCD using molecular beam epitaxy. During the silicon growth on the CCD, 300/o of a monolayer of boron atoms are deposited nominally within a single atomic layer, resulting in the effective elimination of the backside potential well. In this paper, we will briefly discuss ...
Neutron radiography systems based on Gd, Dy and In metallic foils and X-ray films have been used at this centre since early seventies for various NDT and R&D work in nuclear, defense and aerospace industries. In recent years use of digital detection systems such as neutron scintillator and CCD based imaging systems and photostimulated luminescence based phosphor imaging plate systems have been introduced in our work. This has enabled to achieve higher sensitivities and dynamic ranges of recordin ...
Dogs naturally suffer the same complex diseases as humans, including mental illness. The dog is uniquely suited as a model organism to explore the genetics of neuropsychiatric disorders. Historical breed demographics have enriched purebred populations for founder effect mutations with tractable architectures, making genotypic analyses advantageous. Over a pet’s lifetime, owners observe the animal’s stress tolerance, arousal, and anxiety, and can inform on rich behavioral profiles for phenoty ...
Vision-based robotic tracking, fixating and grasping control depends on many environmental factors in an unknown environment. The robot control systems lack robustness, and the calibration of the CCD cameras is very slow and tedious in the existing methods. Although the binocular cameras can solve some of these problems, it is necessary to rely on the time consuming and complicated 3-D reconstruction algorithms (8)-(9). Therefore, it is necessary to develop a more effective vision-based robotic ...
A simple method for the synthesis of rectangular and circular antenna arrays with independently specified beamwidth and sidelobe level is presented. It makes use of the Taylor one-parameter design method, and thus the resulting arrays have decaying sidelobes. Knowing that the array factor of the rectangular array is the product of the array factors of two linear arrays, the rectangular array is obtained by separately designing the two constituent linear arrays, each with the desired beamwidth an ...
How large disk galaxies have evolved in, and out of, the blue cloud of actively star-forming galaxies as a function of environment and time is an outstanding question. Some of the largest disks become systems like M31, M33 and the Milky Way today. In denser environments, it appears they transform onto the red sequence. Tracking disk systems since z<0.5 as a function H I mass, dynamical mass, and environment should be possible in the coming decade. H I and optical data combined can sample oute ...
We present new broadband optical and near-infrared CCD imaging together with deep optical intermediateresolution spectroscopy of the Hickson Compact Group 31. We analyze the morphology and colors of the stellar populations of the galaxies, as well as the kinematics, physical conditions, and chemical composition of the ionized gas in order to get a more complete view on the origin and evolution of the system. We estimate the ages of the most recent star formation bursts of the system, finding an ...
A double-shot inverse-phase color fringe projection profilometry is proposed to measure 3D shape information by using two-step phase shifting. Each of these two patterns encoded with two sinusoidal patterns and one uniform intensity pattern is projected by a digital projection and recorded by a color CCD camera. Firstly, the captured color fringe patterns are separated into its RGB components and two-step phase shifting is composed with red and blue components. Secondly, the dominant error sourc ...
Bonded anchors are used in several civil engineering applications, whose performance needs to be investigated. This paper discusses some experimental investigations on the strength and failure modes of bonded anchors in concrete, without and with confinement reinforcement. The effect of strength of concrete, embedment length and diameter of anchors has been studied. The important parameters influencing the strength of anchorage system are compressive strength of concrete and the embedment depth ...
The integration of all devices under one coherent control system based on EPICS is an important consideration at the SLS. On the other hand, image acquisition and processing is a daily activity for devices in the accelerators, beamlines and experimental stations. Currently, we have developed two approaches, under EPICS, for image acquisition and processing. One is based on an analogue camera with a VME frame grabber connection, and the other is a Firewire (IEEE1394) CCD camera interfaced to a Li ...
In November of 1998, an expedition from Carnegie Mellon University travelled to the Patriot Hills, Antarctica. The purpose of the expedition was to demonstrate autonomous navigation and robotic classiication of meteorites and the characterization of various robotics technologies in a harsh, polar setting. This paper presents early results of experiments performed on this expedition with CCD cameras and laser range nders. It evaluates the ability of these sensors to characterize polar terrain. Th ...
Hardware-in-the-loop transmission testing requires precise speed and torque tracking of the actuators that emulate the engine and vehicle dynamics. System-inversion-based feedforward controllers offer a solution, but they do not work for non-minimum-phase systems. Preview filters can provide stable approximate inversion of non-minimum-phase systems, but they require future values, which are not available in hardware-in-the-loop tests. This article develops a simple but effective controller to en ...
A theoretical study of a thermal neutron radiography system for non-destructive testing of steel pipes as used in power plants was carried out. The system uses a neutron detecting scintillator screen and a cooled CCD-camera connected to a small computer as imaging devices. All components of the system are described by a set of equations representing the physical and optical properties. The equations are incorporated into a computer spreadsheet program to model the system. The input parameters ar ...
A family of carotenoid cleavage dioxygenases (CCDs) produces diverse apocarotenoid compounds via the oxidative cleavage of carotenoids as substrates. Their types are highly dependent on the action of the CCD family to cleave the double bonds at the specific position on the carotenoids. Here, we report in vivo function of the AtCCD4 gene, one of the nine members of the Arabidopsis CCD gene family, in transgenic rice plants. Using two independent single-copy rice lines overexpressing the AtCCD4 tr ...
Cyanobacterial blooms often occur in aquaculture wastewater in China. A floating plant, water hyacinth has been widely used to treat this wastewater. Little is known, however, about bacterial community characteristics and the risk of potential pathogens in cyanobacteria-blooming aquaculture wastewater remediated by water hyacinth. In wastewater treated with water hyacinth, we used culture enumeration and high-throughput sequencing to explore the characteristics of bacterial communities, the stat ...
The problem of synthesizing a linear array generating a shaped beam pattern with M filled nulls has 2/sup M/ alternative solutions. In this study we examined their bandwidths as regards compliance with pattern quality or input impedance requirements in the presence and absence of a backing ground plane. Placing a ground plane behind the antenna almost doubles sidelobe level bandwidth. ...
We propose a fast effective intracavity technique for optical shuttering and wavelength selection in copper vapor lasers and copper bromide lasers by inserting a polychromatic acoustooptic modulator in a low-intensity section of a classical negative branch unstable resonator. Single-pulse or multiple-pulse operation in one- or two-wavelength emission was achieved in a CuBr laser system. The spatial distributions of the output laser beam as recorded by a CCD camera showed neither power losses nor ...
This paper describes the use of the Design of Experiments (DOE) technique with an accurate and efficient physical model. This approach allows for the systematic study of the effects of device geometry and process variations on electrical performance and demonstrates efficiently which parameters have the largest effect on device performane as well as showing any significant interaction between the effects. The model is used to show the variation in performance for a double recessed device. ...
The AMRL flyer sensitivity test apparatus (FSTA) uses the electric gun technique to accelerate 50 pm thick plastic flyer plates of about 3.5 mm in diameter to high velocity. Impacting high explosives with the flyer plates generates short duration shock pulses with sufficient energy to cause ignition. By varying the charge voltage, and hence the flyer velocity, the relative shock sensitivity of explosives can be measured. Detonation or non-detonation of the explosive is indicated by the level of ...
We continue our study of rich Galactic clusters by presenting deep CCD observations of both NGC 2168 (M35) and NGC 2323 (M50). Both clusters are found to be rich (NGC 2168 contains at least 1000 stars brighter than V = 22 and NGC 2323 contains ∼2100 stars brighter than our photometric limit of V ∼ 23) and young (age of NGC 2168 = 180 Myrs, age of NGC 2323 = 130 Myrs). The color-magnitude diagrams for the clusters exhibit clear main sequences stretching over 14 magnitudes in the V , B−V pla ...
We present a compact hyperspectral imaging system consisting of a combined refractive-diffractive optical element for extended longitudinal chromatic aberration, which provides spectrally resolved information of an object. This fully integrated hybrid device features a diffractive optical element (DOE) acting as a positive lens, a tunable concave liquid-filled membrane lens, and integrated magnetic actuation for hydraulically tuning the focal length of the membrane lens. The lens system is demon ...
We compare the ratio of the strong coupling Q, measured in Z” --) b8 events to that measured in Z” -+ qq (q=u,d,a,c) in the SLD experiment at SLAC. Z” -* b6 events are identified with the aid of a precision silicon vertex detector by requiring that at least thiee charged tracks pass more than 3.017 from the Z” decay vertex. This method has an estimated efficieticy of 54% with a purity of 71%. Jets are identified and counted by clustering charged tracks according to the JADE algorithm. By ...
The structure of uranopilite, [(UO2)6(SO4)O2(OH)6(H2O)6](H2O)8, space group P1̄, a 8.896(2), b 14.029(3), c 14.339(3) Å, 96.610(4), 98.472(4), 99.802(4)°, V 1726.1(4) Å3, Z = 2, has been solved and refined on the basis of F2 for all unique data collected with monochromatic MoK X-radiation and a CCD-based detector to an agreement factor (R1) of 7.0%, calculated using 3907 unique observed reflections (Fo ≥ 4 F). The structure contains six symmetrically distinct U6+ cations, each of which is ...
3D building modeling can be more easily generated with several methods. LIDAR data have high potential of automation; though they have such disadvantages as low resolution and no texture. On the other hand, generally, a resolution of the aerial images is higher than that of LIDAR data. The extraction of buildings from aerial images in dense urban environment is easier from aerial images than from LIDAR data. However, the fully automated 3D modeling of buildings from aerial images in dense urban ...
A field effect transistor channel charge partitioning scheme is proposed that explains small-signal port parameters associated with the source and drain terminals. The scheme starts with the channel charge, that can be readily extracted from measurement, and defines source charge as that for a drainless channel. The drain charge is the difference required for neutrality. This new approach is a contrast to alternative schemes that apportion part of the channel charge to the source. A significant ...
According to the morphologic character of cells, a simple way based on the circular aperture diffraction is put forward in the paper. Cells in different states, such as normal living cells, apoptosis cells, necrosis cells, can be differentiated easily and the quantities and the quantities ratio of cells in different states can be got in this way. The diameter of sample cell can be measured accurately by the circular aperture diffraction combined with CCD. The frame diagram of measuring the size ...
The paper presents a fresh linear barcode scanning system based on hybrid template matching scheme. In current area, charge coupled device based scanning skills are not talented of handling motion blur image and trust severely on camera systems for capturing good quality, well focused barcode images which are due to the lack of selfcontrolled and proficient mechanisms. The proposed system is capable of understanding barcodes from lowresolution images containing severe motion blur and works total ...
The current study aimed to improve riboflavin production by native bacterial isolates and medium components. Bacterial species Bacillus subtilis ASU8 (KU559874) and Bacillus tequilensis ASU9 (KU559876) showed high potentiality for riboflavin production. The optimal growth and riboflavin production were achieved after 48 h. The impact of glycine addation to the basal medium was explored by applying different concentrations (0.1-3 g/l). The addition of glycine was effective and the influencing con ...
In this article, we approach the problem of accurately estimating the motion of a multi-ocular camera system from the analysis of point-like features extracted from the acquired images. We propose a method based on optimal 3D data fusion, and compare it with an approach based on projective constraints. We also assess the critical problem of the accurate feature localization on the image planes. The performance of the proposed solutions is here evaluated through simulation tests and through exper ...
The active pixel sensor technology promises high performance than conventional CCD imagers. This paper reports a new high resolution CMOS imager with one transistor active pixel sensing based on capacitorcoupled bipolar action. The base capacitor is pulsed negatively for image integration and positively for image sensing. The pixel size is 5.9um x 5.9um (on 0.8um design rule). The prototype imager has an array of 480 x 640 and operating at 5v Vcc. This active pixel structure is promising for fut ...
Capacitively coupled electrocardiography (cECG) is a means of measuring the electrocardiogram (ECG) unobtrusively. Thus, it has a substantial advantage over the standard ECG using galvanic electrodes, which have to be placed directly on the skin of the patient potentially causing skin irritations and inconvenience. Nevertheless, cECG has multiple drawbacks concerning signal quality and is therefore not used in a clinical environment yet. One of the problems regarding cECG is the different morpho ...
A recursive estimator providing the best linear mean square estimate of an arbitrary signal is derived in a form which is readily implemented using a charge coupled device (CCD) realization of the sliding chirp-z-transform (CZT). This estimator forms the basis of the adaptive matched filter which is being developed for electro-optical sensor applications. A microprocessor is utilized to calculate the frequency domain filter characteristic based on updated noise spectrum estimates. In this manner ...
The Texas Instruments “Virtual Phase” CCD has been the basis of an ambitious design for a precision vertex detector to be used at the Stanford Linear Collider. The performance of this chip shows promise for future use in electron linear colliders. Experimental results are reported in addition to descriptions of the electronic readout and preliminary mechanical design. Submitted to Nuclear Instruments & Methods in Physics Research *Work supported by the Department of Energy, contracts DE-AC02 ...
In this paper, we discuss different modes of coupling photovoltaic detectors to a readout silicon CCD in infrared hybrid arrays, and we analyze, for different types of application, the critical parameters and the related structures. We also give experimental results for the readout of Pb<inf>0.80</inf>Sn<inf>0.20</inf>Te detectors (sensitive in the 8-12-µm range) operated at 77 K, direct-injection coupled to a linear multiplexing silicon CCD. The measured injection e ...
We present a novel thermoreflectance technique to visualise quasi-static Peltier and Joule thermal distributions simultaneously, enabling side-by-side comparison in situ. The main principle is an extension of so called ’-bucket’ imaging techniques well documented in the literature. The method is particularly advantageous in improving both the reliability and turnaround time for the characterisation of thermoelectric materials and related devices such as microcoolers. In essence, separatio ...
We describe the design of a new CCD system delivered to the Automated Patrol Telescope at Siding Springs NSW Australia operated by UNSW. A very fast beam (f/1) with a mosaic of two MITLL CCID-34 detectors placed only 1 mm behind the field flattener which also serves as the dewar window, have called for innovative engineering solutions. This paper describes the design and procedure of the field-flattener mounting, differential screw adjustable detector mount and dewar suspension on the external r ...
A CCD imager which is composed of an interline transfer type scanner in the imaging area and a thin-film photodetector of a heterojunctjon ZnSe-Zn<inf>1-x</inf>Cd<inf>x</inf>Te has been developed. The array consists of<tex>506^{V} \times 404^{H}</tex>picture elements. The imaging area is about<tex>6.7^{V} \times 9.0^{H}</tex>mm<sup>2</sup>in size which corresponds to that of a 2/3-in vidicon. For the device to achieve high performance, ...
CCD detectors used in direct digital intraoral radiography have a linear dose response. When images are displayed on computer monitors a linear display function is also most often employed. Dentists using digital radiography have pointed out that the visual characteristics of such images are different from those of film based images. The aim of the present work was to study the effects of curving the display function. For this purpose 30 digital radiographs were selected, and a computer program ...
'Valencia' sweet orange (Citrus sinensis (L) Osb.) on Rangpur lime (Citrus limonia Osb.) trees with blightlike symptoms showed accumulation of zinc in the bark and re stricted trunk water uptake when compared to healthy trees. A 1982 survey of 215 acres in one location in Sao Paulo re vealed 24%, 10% and 0% blight in 'Valencia' trees on Rang pur lime, trifoliata (Poncirus trifoliata (L) Raf.) and Valencia sweet orange rootstocks, respectively. Blight incidence for trees on Rangpur lime in 1982 i ...
This paper describes an autonomous eye-in-hand coordination application of security robot for services in a variety of applications. We have designed an autonomous mobile security robot called ldquoSecurity Warriorrdquo, which equipped with arms and embedded motion controller combines the non-specific environment of vision system with the robust inverse kinematics computation. In order to reduce the cost and volume, we design an embedded control system for 14 servo motor of robot arms. Besides, ...
The spatial distribution of electron-hole pairs in SiO/sub 2/, induced by electrons and protons, was simulated using a new Monte Carlo (MC) code which calculates the full track structure with parameters found using the complex dielectric function theory for electron energies above 50 eV. For electrons below 50 eV, we included interactions with phonons. Track structure calculations were used to find the spatial distribution of the electron-hole pairs. The charge-yield for electrons and protons un ...
The charge profile of thermally poled electrets has been studied using two different methods, laser induced pressure pulse (LIPP) and pulsed electroacoustic (PEA), to gain insight into the mechanisms that are activated and assess which is the most appropriate method to study the charge profile. Disc–shaped PET samples have been conventionally poled to activate both the α and the ρ relaxation and, right after, partially discharged up to a temperature Tpd. In this way, samples with a different ...