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 20 of 123 for “"Optical Sensors"”.
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Development of novel optical sensors
A range of novel and innovative colourimetric optical indicators for commercially important analytes have been developed and characterised. Water-based colourimetric indicator films are shown to have increased operational lifetimes under ambient conditions compared to similar solvent-based …
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Sapphire fiber in optical sensors
The physical and optical properties of sapphire fiber has been investigated in an effort to create a high temperature optical fiber sensor. Sapphire fiber demonstrates high optical attenuation. This attenuation is very sensitive to injection conditions, and roughly proportional to the cube of the …
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Fingerprint testing protocols for optical sensors
… developing and validating testing protocols for optical fingerprint sensors. Angle of rotation, translation, lighting, and device placement have been identified in this work as variables potentially affecting system performance and protocols were developed to evaluate their effects on optical …
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Plasmonic Optical Sensors: Performance Analysis and Engineering Towards Biosensing
… focuses on performance analysis for plasmonic sensors and implementation of plamonic optical sensors with novel nanofabrication techniques. A universal performance analysis model is established for general two-dimensional plasmonic sensors. This model is based on the fundamental facts of …
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Low-power, low-complexity image classification with optical sensors
… scenarios, such as edge devices, IoT sensors, mobile embedded systems, because of high computational requirements and large memory footprint. Clearly, there is a growing need to investigate lightweight neural-network architectures designed to provide high performance at significantly …
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Development of optical sensors and diagnostics algorithms for aerospace systems
L'abstract è presente nell'allegato / the abstract is in the attachment
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Novel Optical Sensors for High Temperature Measurement in Harsh Environments
… often prevent conventional temperature sensors from being used or make them difficult to use. Novel sensor systems should not only provide accurate and reliable temperature measurements, but also survive the harsh environments through proper fabrication material selections and mechanical …
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Carbon nanotube-based optical sensors for pharmaceutical applications : theory and experiment
… molecule sensitivity, and ease of multiplexing. Sensors can be rendered selective via several detection modalities including the use of natural recognition elements (e.g., proteins) as well as the formation of synthetic molecular recognition sites from adsorbed heteropolymers. However, to date, …
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Optical Sensors for High-Temperature Pressure Measurement and Real-Time Particle Detection
… we report the development of two types of optical sensors, one for high temperature pressure measurements and the other for real-time particle detection. With a high melting temperature (over 2000°C), low optical loss, and excellent corrosion resistance, sapphire (α-Al₂O₃) is ideal for high …
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Optical sensors for the in vivo assessment of flap perfusion in plastic surgery
… was also constructed in order to drive the optical components on the sensor and to detect and pre-process the PPG signals. A Virtual Instrument (VI) was also implemented in LabVIEW in order to display, analyse and archive the PPG signals with the capability of real-time estimation of …
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Estimates of Phytoplankton carbon from high resolution optical sensors in the Southern Ocean
Phytoplankton is an important component of the oceanic carbon cycle, and deriving a good estimate of its carbon biomass (Cphyto) at ocean scale is difficult due to the lack of automatic sampling procedures. This is particularly difficult in the Southern Ocean, where winter conditions limit the …
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Management of stem rot of peanut using optical sensors, machine learning, and fungicides
… is needed. Previous studies have utilized optical sensors combined with machine learning analysis for the early detection of plant diseases, but these studies mainly focused on foliar diseases. Few studies have applied these technologies for the early detection of soilborne diseases in …
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Optical sensors for the location of buried optical cables and disturbances acting on extended lengths of optical fibre
… in this thesis, investigating two novel optical fibre sensor systems, was carried out as part of industrially sponsored (Radiodetection Ltd) and supported applied research project. The first sensor determines the longitudinal position of acoustic disturbances acting on an extended length …
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The Application of Laser Technology for Railroad Top of Rail (TOR) Friction Modifier Detection and Measurements
… examination of the application and accuracy of optical sensors for the purpose of determining rail lubricity of top-of-rail friction modifier is investigated in this research. A literature review of optical sensors as they relate to detecting thin layers is presented, as well as a literature …
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Ionic Self-Assembled Multilayers Adsorbed on Long Period Fiber Gratings for Use as Biosensors
Biosensors have widespread applications in many areas. Currently the Surface Plasmon Resonance (SPR) biosensor is one of the most prevalent types of biosensor. However, it has several disadvantages such as being delicate, expensive, and non-portable. Ionic Self-Assembled Multilayers (ISAMs) …
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Heterogene Sensordatenfusion zur robusten Objektverfolgung im automobilen Straßenverkehr
… a sensor data fusion of heterogenous sensors is therefore essential. Here the advantages of radar sensors measuring the dynamic properties of objects can be combined with the advantages of optical sensors measuring their geometric dimension. In order to achieve an optimal fusion, …
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The Development of Ionophore-Selective Based optical chemical sensors for the determination of heavy metal ions in aqueous environments
The development of optical sensors for in-situ, real-time and low-cost monitoring of heavy metal ions is a tremendously and fast growing area of research. This work presents several novel sensing strategies for developing optical chemical sensors that can be used as early warning devices for heavy …
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Investigation and application of the Frustrated-Total-Internal-Reflection phenomenon in optical fibers
All-fiber optical sensors have established themselves in the market for a decade. Among different categories of these sensors is the intensity-based type whose advantages make it suitable for many practical applications. Frustrated Total Internal Reflection (FTIR) is a phenomenon that shows a great …
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