Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"heterodyning"”.
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Microwave Signal Generation Using Self-Heterodyning of a Fast Wavelength Switching SG-DBR Laser
Microwave signal generation is demonstrated using a single-chip fast wavelength-tunable SG-DBR laser. Microwave signals are established by a delayed self-heterodyne technique. The optical frequency of the laser is square-wave modulated between two closely spaced wavelengths. These two wavelengths …
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Novel Optical Technique for Real-Time Pattern/Image Recognition
… (JTC). The technique employs acousto-optic heterodyning scanning. The proposed real-time JTC system does not require a SLM in the Fourier plane as in conventional real-time JTC systems. This departure from the conventional scheme is extremely important, as the proposed approach does not …
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Investigation of Microwave Transducer for Linearity Dependence and Applications in Quantum Networking
… microwave transducer is created using the heterodyning beat method. A high-speed MUTC photodiode designed for cryogenic temperatures is tested as the transducer and characterized with a spectrum analyzer. The linearity of the device is also tested at bias voltages of 0 V and −5 V, …
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ΘΕΩΡΙΑ ΤΩΝ ΠΕΠΙΕΣΜΕΝΩΝ (SQUEEZED) ΚΑΤΑΣΤΑΣΕΩΝ ΚΑΙ ΕΦΑΡΜΟΓΕΣ ΣΤΗΝ ΚΒΑΝΤΙΚΗ ΟΠΤΙΚΗ
… AND AMPLITUDE MODULATED FIELD AND WE STUDIED THE HETERODYNING INTERFERENCE THEORY. WE ALSO STUDIED THE OFF-RESONANCE NONDEGENERATE PARAMETRIC AMPLIFIER AND UNDER WHICH CONDITIONS THERE IS QUANTUM NOISE SQUEEZING PHENOMENON.
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Time-Offset Fractional-N PLLs for Heterodyne FMCW SAR
… PLLs for waveform synthesis to enable low-cost heterodyning and simplify filter-based feed-through suppression. This system architecture is revealed to be susceptible to swept-offset spurii termed spur chirps which hinder the sensor's performance. While integer boundary spurs and phase detector …
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The application of laser doppler technique to vibration measurement and position control.
… motion. The magnitude was found by standard heterodyning techniques, mixing light scattered from the target with a part of the original laser output in a controlled manner. A phase quadrature method was used to identify the direction of the target. This differs from the more usual method of …
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The NICE-OHVMS technique: realizing the full potential of precision molecular ion spectroscopy
… through the absorber, frequency modulation (heterodyning) encodes the detected signal at radio frequencies to minimize the 1/f noise, and velocity modulation makes the technique specific to ions. The optical cavity also results in a large power enhancement through the absorber which can …
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Studies of Interactions Between Rod-like Celulose Nanocrystals and Xylan and Pullulan Derivatives: A Light Scattering Study
… functions from Hv and Vv mode exhibited partial heterodyning. Decay time distributions of the binary and ternary systems showed that aggregates existed in the binary system but disappeared in the ternary system. These observations revealed that HPMAX adsorbed onto a fraction of the cellulose …
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Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… the conceptual differences between optical heterodyning of SHG signals and our presented "stimulation" framework. In the second half of Chapter 4, we use the additional field to resolve the SHG signal phase revealing the sign and magnitude of the sample nonlinear susceptibility. We perform …
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X-ray microscope performance enhancement through control architecture change
The goal of this thesis is to apply control algorithms to improve the performance of nanopositioning devices used on the beamline in Advanced Photon Source (APS) at Argonne National Laboratory (ANL). A prototype device, better known as the Early User Instrument (EUI) was the subject of this work. …