Search for dissertations about: "cavity noise"

Showing result 1 - 5 of 28 swedish dissertations containing the words cavity noise.

  1. 1. Low phase noise voltage controlled micro- and millimeter wave oscillators

    University dissertation from Chalmers University of Technology

    Author : Stefan Andersson; Chalmers tekniska högskola.; Chalmers University of Technology.; [1998]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; phase noise; FM noise; PM noise; noise; microwave; millimetre wave; mm-wave; radio; RF; oscillator; VCO; 1 f noise; oscillation criteria; resonator; delay line; stabilised; quarts crystal; phase error; microstrip resonator; cavity resonator; dielectric resonator; DR; DRO; surface acoustic wave; SAW; sapphire resonator; whispering gallery mode; YIG sphere; YIG film; fibre optic; Fabry-Perot resonator; device; silicon bipolar transistor; Si BJT; gunn diode; MESFET; HEMT; HFET; PHEMT; HBT; amplitude limiter; automatic gain control; AGC; clipping diode; varactor; anti series; piezo electric; magnetostrictive; terfenol; multiplier; phase locked loop; PLL; frequency discriminator; balanced oscillator; transposed gain; laser;

    Abstract : .... READ MORE

  2. 2. Predictions of Aerodynamically Induced Wind Noise Around Ground Vehicles

    University dissertation from Chalmers University of Technology

    Author : Jonas Ask; Chalmers tekniska högskola.; Chalmers University of Technology.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningsmekanik; Fluid mechanics; CAA; LES; Curle; low Mach number; incompressibility; air rush noise; cavity; side mirror; ground vehicle;

    Abstract : Over the last decade wind noise has with few exceptions consistently generated a constant or even growing level of customer complaints to automotive companies world-wide. This can partly be explained by a relatively greater focus on engine, power-train and tire noise combined with a growing need to reduce weight in future cars. READ MORE

  3. 3. Modal Dynamics of Vertical-Cavity Surface-Emitting Lasers

    University dissertation from Chalmers University of Technology

    Author : Johan S. Gustavsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2003]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; Semiconductor laser; vertical-cavity surface-emitting laser; modeling; dynamics; transverse modes; noise;

    Abstract : In this work, a comprehensive dynamic model has been developed for simulating a novel semiconductor laser type, referred to as the Vertical-Cavity Surface-Emitting Laser (VCSEL). The high-speed behavior was simulated and compared to experiments, where excellent agreement was found. READ MORE

  4. 4. Fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry

    University dissertation from Umeå : Umeå University

    Author : Aleksandra Foltynowicz; Umeå universitet.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; absorption spectrometry; frequency modulation; cavity enhancement; NICE-OHMS; Laser frequency stabilization; fiber laser; Fabry-Perot cavities; sub-Doppler spectroscopy; trace gas detection; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; NATURAL SCIENCES Physics Atomic and molecular physics Molecular physics; NATURVETENSKAP Fysik Atom- och molekylfysik Molekylfysik; fysik; Physics;

    Abstract : Noise-immune cavity-enhanced optical heterodyne molecular spectro-metry (NICE-OHMS) is one of the most sensitive laser-based absorption techniques. The high sensitivity of NICE-OHMS is obtained by a unique combination of cavity enhancement (for increased interaction length with a sample) with frequency modulation spectrometry (for reduction of noise). READ MORE

  5. 5. The influence of tyre air cavities on vehicle acoustics

    University dissertation from Stockholm : KTH

    Author : Èric Torra i Fernàndez; KTH.; [2006]
    Keywords : acoustics; tyre-road noise; tyre; air cavity resonances; interior noise; aluminium foams; TECHNOLOGY Engineering physics Acoustics; TEKNIKVETENSKAP Teknisk fysik Akustik;

    Abstract : The tonal character of the low frequency internal noise in cars is often due to energy transmission through the tyre at the first few eigenfrequencies of the air cavity of the tyre. The first acoustic mode in the air cavity of a typical stationary car tyre is approximately 224 Hz. READ MORE