نتایج جستجو برای: diode detector

تعداد نتایج: 78175  

2001
K. K. Gan

An optical package of novel design has been developed for the ATLAS pixel detector. The package contains two VCSELs and one PIN diode to transmit and receive optical signals. The design is based on a simple connector-type concept and is made of radiation-hard material. Several packages have been fabricated and show promising results.

Journal: :Applied optics 1997
A V Krishnamoorthy T K Woodward K W Goossen J A Walker S P Hui B Tseng J E Cunningham W Y Jan F E Kiamilev D A Miller

We describe a smart-pixel circuit that permits the use of a GaAs/AlGaAs multiple quantum well diode to be used both as a detector for data input and a modulator for data output. The module provides the ability to double the number of inputs or outputs to the array and is well suited to cascaded optoelectronic system architectures that require bidirectional communition.

Journal: :Medical dosimetry : official journal of the American Association of Medical Dosimetrists 2010
Vladimir Feygelman D Opp K Javedan A J Saini G Zhang

The Delta4 biplanar diode array dosimeter was validated for helical tomotherapy delivery QA. The basic detector characteristics were found to be satisfactory in terms of short-term reproducibility (0.1%), linearity (<0.1%), dose rate dependence (0.4%), and absolute calibration accuracy (0.4% in the center of the phantom compared with the independently calibrated diode). Relative calibration of ...

Journal: :Cytometry 1993
R M Doornbos E J Hennink C A Putman B G De Grooth J Greve

A flow cytometer using a solid state light source and detector was designed and built. For illumination of the sample stream two types of diode lasers (670 nm and 780 nm) were tested in a set-up designed to differentiate human leukocytes by means of light scattering. The detector is an avalanche photodiode, which was used to detect the weak scattered light in the orthogonal direction. The new f...

1998
G. T. Foster S. L. Mielke L. A. Orozco

We couple noise into the driving current of a laser diode to produce correlated light. We characterize the intensity correlations of the laser with two different techniques: two detector photon coincidence and analysis of the photocurrent from a single detector. The light exhibits bunching with a magnitude and characteristic time set by the bandwidth and amplitude of the noise modulating the la...

Journal: :Molecules 2010
Vânia Aparecida de Freitas Formenton Macedo Dos Santos Daniela Pereira Dos Santos Ian Castro-Gamboa Maria Valnice Boldrin Zanoni Maysa Furlan

This work describes the isolation of the secondary metabolites identified as the quinonemethides maytenin (1) and pristimerin (2) from Maytenus ilicifolia extracts obtained from root barks of adult plants and roots of seedlings and their quantification by high performance liquid chromatography coupled to a diode array detector. The electrochemical profiles obtained from cyclic voltammetry and a...

Journal: :Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 2006
Carolyn McKerracher David I Thwaites

BACKGROUND AND PURPOSE Solid-state detectors such as diodes and diamonds are useful radiation detectors, particularly for small field measurements, such as in stereotactic dosimetry or in the small sub-field measurements required for intensity modulated radiotherapy (IMRT) . In all small field measurements, positioning of the detector is critical. Generally it is assumed that the center of the ...

2006
K. Eppinger R. Gernhäuser R. Krücken S. Schwertel

CVD-diamond is a detector material with fast signals, high charge carrier mobility, smallest lattice constant, and large band-gap [1] resulting in radiation hardness, very good timing and high count rate capability. These properties make it an ideal material for heavy ion tracking and TOF detectors. Polycrystalline diamond is successfully used as detector material at GSI for some years at sever...

2007
Jeffrey L. Hesler Thomas W. Crowe

Schottky barrier diodes can be used as direct detectors throughout the millimeterand submillimeterwave bands. When the diodes are optimized to have a low forward turn-on voltage, the detectors can achieve excellent frequency response and bandwidth, even with zero-bias. This paper reports on the characterization of VDI’s zerobias Schottky detectors. Responsivity typically ranges from 4,000 V/W a...

Journal: :Applied Physics Express 2022

Abstract We developed a novel terahertz-wave detector fabricated on SiC platform implementing an InP/InGaAs Fermi-level managed barrier (FMB) diode. The FMB diode epi-layers were transferred substrate, and waveguide coupler filters monolithically integrated with Then, the chip was assembled in fundamental mixer module WR-3 rectangular-waveguide-input port. It exhibited minimum noise equivalent ...

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