Relevant bibliographies by topics / Optical distance measurement / Dissertations / Theses
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Dissertations / Theses on the topic 'Optical distance measurement'

Author: Grafiati
Published: 28 June 2021
Last updated: 29 July 2025

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1

Veng, Mengkoung. "Self-mixing interferometry for absolute distance measurement : modelling and experimental demonstration of intrinsic limitations." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0077.

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La Self-Mixing Interférométrie (SMI) a été étudiée de manière approfondie au cours des cinq dernières décennies dans diverses applications. Les capteurs selon la technique SMI ont la diode laser comme la source de lumière, l'interféromètre et le détecteur. La lumière de la diode laser se propage vers une cible éloignée où elle est partiellement réfléchie ou rétrodiffusée avant d'être réinjectée dans la cavité active du laser. Lorsque la diode laser subit le retour optique externe, la lumière réfléchie imprimée avec des informations provenant de la cible éloignée ou du milieu de cavité externe
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2

Widjanarko, Taufiq. "Hyperspectral interferometry for single-shot profilometry and depth-resolved displacement field measurement." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8349.

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A new approach to the absolute measurement of two-dimensional optical path differences is presented in this thesis. The method, which incorporates a white light interferometer and a hyperspectral imaging system, is referred to as Hyperspectral Interferometry. A prototype of the Hyperspectral Interferometry (HSI) system has been designed, constructed and tested for two types of measurement: for surface profilometry and for depth-resolved displacement measurement, both of which have been implemented so as to achieve single shot data acquisition. The prototype has been shown to be capable of perf
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3

Nissinen, I. (Ilkka). "CMOS time-to-digital converter structures for the integrated receiver of a pulsed time-of-flight laser rangefinder." Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514295478.

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Abstract The aim of this thesis was to develop time-to-digital converters (TDC) for the integrated receiver of a pulsed time-of-flight (TOF) laser rangefinder aiming at cm-level accuracy over an input range of 10 m – 15 m. A simple structure, a high integration level and low power consumption are the desired features for such a TDC. From the pulsed TOF laser rangefinder point of view an integrated receiver consisting of both the TDC and the receiver channel on the same die offers the possibility of manufacturing these laser rangefinders with a high integration level and at a low pric
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4

Piracha, Mohammad Umar. "A laser radar employing linearly chirped pulses from a mode-locked laser for long range, unambiguous, sub-millimeter resolution ranging and velocimetry." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5372.

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Light detection and ranging (lidar) is used for various applications such as remote sensing, altimetry and imaging. In this talk, a linearly chirped pulse source is introduced that generates wavelength-swept pulses exhibiting ~6 nm optical bandwidth with > 20 km coherence length. The chirped pulses are used in an interferometric lidar setup to perform distance measurements with sub-millimeter resolution (using pulses that are a few meters long), at target distances > 10 km, with at least 25 dB signal-to-noise ratio at the receiver. A pulse repetition rate of 20 MHz provides fast update rates,
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5

Macháček, Jan. "Fokusovací techniky optického měření 3D vlastností." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442511.

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This thesis deals with optical distance measurement and 3D scene measurement using focusing techniques with focus on confocal microscopy, depth from focus and depth from defocus. Theoretical part of the thesis is about different approaches to depth map generation and also about micro image defocusing technique for measuring refractive index of transparent materials. Then the camera calibration for focused techniques is described. In the next part of the thesis is described experimentally verification of depth from focus and depth from defocus techniques. For the first technique are shown resul
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6

Clement, Pierre. "Solutions aux limites des interrogateurs B-OTDR pour la surveillance d'infrastructures : augmentation de la portée de mesure et décorrélation des paramètres de température et de déformation." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT042.

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Cette thèse porte sur l’étude des systèmes de mesure répartie de la rétrodiffusion Brillouin dans une fibre optique, que l’on nomme B-OTDR et qui sont sensibles à la température et à la déformation de la fibre. Les solutions d'interrogateurs actuelles permettent l'instrumentation de grandes infrastructures. Cependant, il existe des limites, inhérentes au phénomène physique utilisé, qui ne permettent pas d'adresser certaines applications spécifiques. Ces limites portent sur la distance de mesure maximale accessible par ces interrogateurs mais également sur la décorrélation de la mesure des para
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7

Fuhrland, Matthias. "Konzeption und Umsetzung neuer Technologien zur biaxialen Winkelmessung und elektrooptischen Pseudostreckenmessung." Doctoral thesis, München : Verl. der Bayerischen Akad. der Wiss, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1201784888043-41278.

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8

Fuhrland, Matthias. "Konzeption und Umsetzung neuer Technologien zur biaxialen Winkelmessung und elektrooptischen Pseudostreckenmessung." Doctoral thesis, München Beck, 2007. http://d-nb.info/988973138/04.

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9

Stefani, Mario Antonio. "Medidores de distância por triangulação a laser." Universidade de São Paulo, 1995. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-19032009-093741/.

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Os Medidores de Distância por Triangulação a Laser são sistemas optoeletrônicos destinados à medição de pequenas distâncias ou deslocamentos, sem contato físico direto. Estes equipamentos possuem um grande campo de aplicações industriais. Este trabalho descreve as diversas configurações que este equipamento pode se apresentar, discutindo suas vantagens relativas. São estudadas também as suas partes e os componentes mais indicados. O projeto detalhado de um medidor usando sensor tipo CCD, e apresentado. Algumas aplicações industriais deste modelo são relatadas e diversos métodos e sugestões de
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10

Génevé, Lionel. "Système de déploiement d'un robot mobile autonome basé sur des balises." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD024/document.

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Cette thèse s’inscrit dans le cadre d’un projet visant à développer un robot mobile autonome capable de réaliser des tâches spécifiques dans une zone préalablement définie par l’utilisateur. Afin de faciliter la mise en œuvre du système, des balises radiofréquences fournissant des mesures de distance par rapport au robot sont disposées au préalable autour du terrain. Le déploiement du robot s’effectue en deux phases, une première d’apprentissage du terrain, puis une seconde, où le robot effectue ses tâches de façon autonome. Ces deux étapes nécessitent de résoudre les problèmes de localisation
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11

Liao, Wen Pin, and 廖文賓. "Implementation of optical pick-up sensor for distance measurement." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/94716927460273382692.

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12

Majumdar, Ayan. "Development of optical fiber sensors for distance, refractive index and strain measurement." 2008. http://hdl.handle.net/10106/1641.

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13

Du, Plessis Jan Harm. "An all-fibre laser distance measurement system utilising figure-eight fibre lasers with electro-optic amplitude modulation." Thesis, 2010. http://hdl.handle.net/10210/3417.

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M.Ing.<br>The aim of this project is to research the feasibility of an all-fibre laser distance measurement device that utilises a figure-eight fibre laser (F8L), in the nonlinear amplifying loop mirror (NALM) configuration, as a light source and implements pulse compression to improve the accuracy and signal-to-noise ratio of the system. A figure-eight fibre laser in the NALM configuration for use in a laser distance measurement device is described. The theory of fibre lasers is discussed, including mode-locking and Qswitching, and the characteristics of a NALM loop are analysed. By varying t
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14

Chiang, Kuo-wei, and 江國維. "Electro-Optical System with Superheterodyne and Phase-detecting Techniques for Distance、Vibration and Acceleration Measurements." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/4up78v.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>90<br>This paper designs an Electro-Optical measuring system. The light source can use of Laser or LED, and I made choice of 880nm’s photodiode as the optical receiver. The Phase-Detecting theory is used in this measuring system. It transmits a continuous wave to measure the distance、vibration and acceleration. Then use superheterodyne theorem to mix the frequency and make it down to 10KHZ, which method can get the best resolution on Phase-detector’s result. This paper majors in the software and hardware design. The software contains ASSEMBLY, C language and VER
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15

Huang, Wen Xin. "A fibre optic based ranging sensor." Thesis, 1993. https://vuir.vu.edu.au/18178/.

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The remote determination of distance is an important requirement in a wide variety of technical and industrial applications. Ranging techniques have evolved from geometrical to bulk optical or radar methods. There is however a demand for low-cost short to medium range sensors, for operation in potentially hazardous environments, which may be satisfied by optical fibre based sensors. In this thesis the development of an optical ranging sensor, based on fibre optic technology, is described for range measurements over a few metres. Its operation requires an intensity modulated frequency-sw
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