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You searched for subject:( risetime). Showing records 1 – 3 of 3 total matches.

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University College London (University of London)

1. Smith, Andrew James Alan. Fast waveform metrology : generation, measurement and application of sub-picosecond electrical pulses.

Degree: 1996, University College London (University of London)

This thesis describes work performed at the National Physical Laboratory to improve the electrical risetime calibration of instruments such as fast sampling oscilloscopes. The majority of the work can be divided into four sections: development of an ultrafast optoelectronic pulse generator; measurement of fast electrical pulses with an electrooptic sampling system; de-embedding of transmission line and transition effects as measured at different calibration reference planes; and calibration of an oscilloscope. The pulse generator is a photoconductive switch based on low-temperature Gallium Arsenide, which has a very fast carrier recombination time. Sub-picosecond electrical pulses are produced by illuminated a planar switch with 200 fs optical pulses from a Ti: sapphire laser system. The pulses are measured using a sampling system with an external electro-optic probe in close proximity to the switch. The electro-optic sampling system, with a temporal resolution better than 500 fs, is used to measure the electrical pulses shape at various positions along the planar transmission line. The results are compared to a pulse propagation model for the line. The effects of different switch geometries are examined. Although the pulse generator produces sub-picosecond pulses near to the point of generation, the pulse is shown to broaden to 7 ps after passing along a length of transmission line and a coplanar-coaxial transition. For a sampling oscilloscope with a coaxial input connector, this effect is significant. Frequency-domain measurements with a network analyser, further electro-optic sampling measurements, and the transmission line model are combined to find the network transfer function of the transition. Using the pulse generator, the electro-optic sampling system and the transition knowledge, a 50 GHz sampling oscilloscope is calibrated. The determination of the instrument step response(nominal risetime 7 ps) is improved from an earlier value of 8.5 -3.5 / +2.9 ps to a new value of 7.4 -2.1 / +1.7 ps with the calibration techniques described.

Subjects/Keywords: 530.8; Electrical risetime calibration; Oscilloscopes

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Smith, A. J. A. (1996). Fast waveform metrology : generation, measurement and application of sub-picosecond electrical pulses. (Doctoral Dissertation). University College London (University of London). Retrieved from http://discovery.ucl.ac.uk/1349613/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362872

Chicago Manual of Style (16th Edition):

Smith, Andrew James Alan. “Fast waveform metrology : generation, measurement and application of sub-picosecond electrical pulses.” 1996. Doctoral Dissertation, University College London (University of London). Accessed October 14, 2019. http://discovery.ucl.ac.uk/1349613/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362872.

MLA Handbook (7th Edition):

Smith, Andrew James Alan. “Fast waveform metrology : generation, measurement and application of sub-picosecond electrical pulses.” 1996. Web. 14 Oct 2019.

Vancouver:

Smith AJA. Fast waveform metrology : generation, measurement and application of sub-picosecond electrical pulses. [Internet] [Doctoral dissertation]. University College London (University of London); 1996. [cited 2019 Oct 14]. Available from: http://discovery.ucl.ac.uk/1349613/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362872.

Council of Science Editors:

Smith AJA. Fast waveform metrology : generation, measurement and application of sub-picosecond electrical pulses. [Doctoral Dissertation]. University College London (University of London); 1996. Available from: http://discovery.ucl.ac.uk/1349613/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362872


Brno University of Technology

2. Bančák, Matej. Snímání signálu akustické emise s využitím vlnovodů .

Degree: 2015, Brno University of Technology

Bakalárska práca sa zaoberá problematikou snímania akustických emisií z povrchu telesa a snímania za pomoci akustického vlnovodu umiesteného na telese. Práca obsahuje súčasný prehľad spôsobov snímania akustických emisií, možnosti inštalácie vlnovodu a šírenie vĺn. Praktická časť je zameraná na experiment, ktorý porovnáva namerané hodnoty z povrchu skúšaného telesa a z vlnovodu. Meranie bolo realizované na oceli bežnej akosti za pomoci meracieho prístroju Dakel Xedo. Ďalším cieľom práce je pokúsiť sa utlmiť odrazený signál, ktorý vzniká pôsobením sily na skúšané teleso.; Bachelor thesis is focused on the issue of scanning acoustic emissions from the surface of solid body and scanning with the help of acoustic waveguide placed on the solid body. The work includes the review of the present ways of scanning acoustic emissions, options of installation waveguide and propagation of waves. The practical part is focused on the experiment, which compares measured values from the surface of the test body and from the waveguide. The measurement was realized on steel of the standard quality for using a measuring instrument Dakel Xedo. The next object of this work was try to attenuate the reflected signal, which is produced by the action of force on the test body. Advisors/Committee Members: Mazal, Pavel (advisor).

Subjects/Keywords: akustická emisia; diagnostika; akustický vlnovod; doba nábehu; Acoustic emission; diagnostics; acoustic waveguide; risetime

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bančák, M. (2015). Snímání signálu akustické emise s využitím vlnovodů . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/39619

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bančák, Matej. “Snímání signálu akustické emise s využitím vlnovodů .” 2015. Thesis, Brno University of Technology. Accessed October 14, 2019. http://hdl.handle.net/11012/39619.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bančák, Matej. “Snímání signálu akustické emise s využitím vlnovodů .” 2015. Web. 14 Oct 2019.

Vancouver:

Bančák M. Snímání signálu akustické emise s využitím vlnovodů . [Internet] [Thesis]. Brno University of Technology; 2015. [cited 2019 Oct 14]. Available from: http://hdl.handle.net/11012/39619.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bančák M. Snímání signálu akustické emise s využitím vlnovodů . [Thesis]. Brno University of Technology; 2015. Available from: http://hdl.handle.net/11012/39619

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


McMaster University

3. Joseph, Wai-Ting. Design and Modeling of Schottky Barrier Photodiodes.

Degree: ME, 1981, McMaster University

The computer program developed by T.B. Remple for the analysis of PiN photodiodes has been modified to handle Schottky barrier cases. The fundamental physics involved in the original model is summarized and the theories for a metal-semiconductor interface are presented. The boundary values for n, p, and ψ are then defined in such a way that ψ (x) would be in agreement with the thermionic-diffusion theory. An equivalent circuit approach is used to determine the RC response of the photodetector. While the modified version of the computer model provides very detailed analysis of the device, it is also very expensive to run. A simplified model is therefore employed for the design process. The objective is to design an Au-nGe photodiode with a risetime less than 50 psecs. The set of optimum design parameters obtained with the simplified model is then taken as the input to the modified version of Remple's program for further analysis. The theoretical risetime of the optimum design is found to be about 45 psecs.

Thesis

Master of Engineering (ME)

Advisors/Committee Members: Marton, J.P., Engineering Physics.

Subjects/Keywords: analysis, PiN photodiodes, Schottky, barrier, risetime; T.B. Remple, Thermionic-diffusion theory

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Joseph, W. (1981). Design and Modeling of Schottky Barrier Photodiodes. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/18527

Chicago Manual of Style (16th Edition):

Joseph, Wai-Ting. “Design and Modeling of Schottky Barrier Photodiodes.” 1981. Masters Thesis, McMaster University. Accessed October 14, 2019. http://hdl.handle.net/11375/18527.

MLA Handbook (7th Edition):

Joseph, Wai-Ting. “Design and Modeling of Schottky Barrier Photodiodes.” 1981. Web. 14 Oct 2019.

Vancouver:

Joseph W. Design and Modeling of Schottky Barrier Photodiodes. [Internet] [Masters thesis]. McMaster University; 1981. [cited 2019 Oct 14]. Available from: http://hdl.handle.net/11375/18527.

Council of Science Editors:

Joseph W. Design and Modeling of Schottky Barrier Photodiodes. [Masters Thesis]. McMaster University; 1981. Available from: http://hdl.handle.net/11375/18527

.