نتایج جستجو برای: optical voltage transducer

تعداد نتایج: 388587  

Journal: :Sensors and Actuators A-physical 2023

Caries and periodontitis affect the majority of adults during their lifetime. Piezoelectric ultrasonic scalers offer great benefits prevention treatment periodontal diseases. Our group developed a novel scaler based on planar piezoelectric transducer. However, similar to other configurations, transducer’s characteristics are strongly influenced by operation conditions. In this study, we investi...

2016
Gregor Thalhammer Craig McDougall Michael Peter MacDonald Monika Ritsch-Marte

Many applications in the life-sciences demand non-contact manipulation tools for forceful but nevertheless delicate handling of various types of sample. Moreover, the system should support high-resolution optical imaging. Here we present a hybrid acoustic/optical manipulation system which utilizes a transparent transducer, making it compatible with high-NA imaging in a microfluidic environment....

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی برق و کامپیوتر 1391

this thesis is presented 10 ghz voltage controlled ring oscillator for high speed application. the voltage controlled ring oscillator was designed and fabricated in 0.13یm cmos technology. the oscillator is 7-stages ring oscillator with one inverter replaced by nand-gate for shutting down in the ring oscillator during idle mode. tri-state inverter was used to control of 126 bit vector in ri...

1999
Simona Bauer-Gogonea Siegfried Bauer Reimund Gerhard-Multhaupt

Mono-, bi-, and multimorphs are poled electrets with +/0, +/-, and more complicated alternatingpolarity dipole-orientation patterns, respectively. Because of their unusual macroscopic piezoand pyroelectrical as well as nonlinear optical properties, such structures are of particular interest for special transducer and optical waveguide applications. In this contribution, the preparation of such ...

2014
Estefanía Ortega Javier Galbán Susana de Marcos

In spite of the substantial amount of work done in optical sensor research, it is difficult to find a biochemical receptor/optical transducer scheme, which can be used for a device permitting the continuous monitoring of a chemical compound in clinical or environmental samples. Perhaps one of the most interesting alternatives is based on using biochemical receptors that, in the appropriate conc...

2009
R. Hui I. Maio I. Montrosset

Semiconductor laser amplifiers have been subject of great interest for several years now. Travelling wave semiconductor laser amplifiers have recently been implemented in optical fibre communication systems as optical repeaters and optical preamplifiers. Automatic gain control (AGC) of laser amplifiers is required in more reliable optical communication systems to compensate for the effect relat...

2012
Tatiana Novikova Olga Barinova Pushmeet Kohli Victor S. Lempitsky

This paper proposes a new model for the task of word recognition in natural images that simultaneously models visual and lexicon consistency of words in a single probabilistic model. Our approach combines local likelihood and pairwise positional consistency priors with higher order priors that enforce consistency of characters (lexicon) and their attributes (font and colour). Unlike traditional...

2003
Shigeaki Matsumoto

The shape of a dew droplet deposited on the mirror surface of a copper plate was measured accurately using an interference microscope that employed a phase-shift technique. The microscope was constructed by adding a piezoelectric transducer to an interference microscope. A simple method that uses a conventional speaker horn and an optical fibre cable was used to depress any speckle noise. The s...

Journal: :Neurophotonics 2015
Walther Akemann Chenchen Song Hiroki Mutoh Thomas Knöpfel

The invention of membrane voltage protein indicators widens the reach of optical voltage imaging in cell physiology, most notably neurophysiology, by enabling membrane voltage recordings from genetically defined cell types in chronic and life-long preparations. While the last years have seen a dramatic improvement in the technical performance of these indicators, concomitant innovations in opto...

Journal: :Journal of biomedical optics 2011
Patrick D Kumavor Chen Xu Andres Aguirre John Gamelin Yasaman Ardeshirpour Behnoosh Tavakoli Saeid Zanganeh Umar Alqasemi Yi Yang Quing Zhu

We present a photoacoustic tomography-guided diffuse optical tomography approach using a hand-held probe for detection and characterization of deeply-seated targets embedded in a turbid medium. Diffuse optical tomography guided by coregistered ultrasound, MRI, and x ray has demonstrated a great clinical potential to overcome lesion location uncertainty and to improve light quantification accura...

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