Sökning: "limit of detection"
Visar resultat 21 - 25 av 284 avhandlingar innehållade orden limit of detection.
21. Diagnosability performance analysis of models and fault detectors
Sammanfattning : Model-based diagnosis compares observations from a system with predictions using a mathematical model to detect and isolate faulty components. Analyzing which faults that can be detected and isolated given the model gives useful information when designing a diagnosis system. LÄS MER
22. Compensation of Laser Phase Noise Using DSP in Multichannel Fiber-Optic Communications
Sammanfattning : One of the main impairments that limit the throughput of fiber-optic communication systems is laser phase noise, where the phase of the laser output drifts with time. This impairment can be highly correlated across channels that share lasers in multichannel fiber-optic systems based on, e.g. LÄS MER
23. Laser-based absorption spectrometry : development of NICE-OHMS towards ultra-sensitive trace species detection
Sammanfattning : Laser-based absorption spectroscopy (AS) is a powerful technique for qualitative and quantitative studies of atoms and molecules. An important field of use of AS is the detection of species in trace concentrations, which has applications not only in physics and chemistry but also in biology and medicine, encompassing environmental monitoring, regulation of industrial processes and breath analysis. LÄS MER
24. Development of Ultra-fast Biosensors for Detection of Non-electroactive Neurotransmitters
Sammanfattning : During neuronal communication neurotransmitters are released through the process exocytosis that occurs on the time scale of sub-milliseconds to milliseconds. Neuronal activity by neurotransmitters that are non-electroactive cannot easily be monitored due to limitations in the temporal resolutions of the sensor probes for these analytes. LÄS MER
25. Mid- and near-infrared NICE-OHMS : techniques for ultra-sensitive detection of molecules in gas phase
Sammanfattning : Noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) is a technique for ultra-sensitive detection of molecular absorption and dispersion. For highest performance, the technique combines cavity enhancement (CE) with frequency modulation (FM); while the former increases the effective interaction length between the light and the analyte by several orders of magnitudes, the latter removes the in-coupling of 1/f noise and makes the signals background free. LÄS MER