Microwavephysics and Atmospheric Physics
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Biomedizinische Photonik
Ultrafast Science and Technology
Last update: 02.11.2018
HS 2017: Seminare über Microwavephysics and Atmospheric Physics
Friday 10-12
Vorträge, die innerhalb der nächsten Tage stattfinden, sind speziell markiert.
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Freitag, 22.09.2017

PhD Defense: Trend and oscillations in middle atmospheric ozone observed by a ground-based microwave radiometer

Zeit: 14:15 Uhr
Hörsaal: B5
Lorena Moreira Méndez
Institute of Applied Physics
University of Bern

Freitag, 20.10.2017

Characterization of low-loss reflectors for spaceborne microwave radiometers

Zeit: 10:15 Uhr
Hörsaal: A97
Dr. Axel Murk
Institute of Applied Physics
University of Bern

Every reflector of a microwave radiometer will introduce a certain loss which affects the sensitivity and radiometric accuracy of the instrument. These losses depend on material properties of the reflector, the frequency, as well as on the incidence angle and polarization. An accurate measurement of the losses is required in order to select the optimum reflector coating and to correct the losses in the calibration process.

We characterized different reflector samples of the Ice Cloud Imager (ICI, 183-670 GHz) and Microwave Sounder (MWS, 23-230 GHz) instruments of the Meteorological Operational Satellite - Second Generation (MetOP-SG). In order to achieve the required measurement accuracy in the order of 0.1% in the different frequency bands we used a circular waveguide cavity and a free space resonator technique. The talk will give an introduction to the theory of reflector losses and the used resonators. After an overview of the test results it will discuss the consequences for the MetOP-SG instruments and for the ground based instruments of IAP.

Freitag, 27.10.2017

Identification and quantification of aerial bio-scatterer by radar in near real time

Zeit: 10:15 Uhr
Hörsaal: A97
Dr. Felix Liechti
Swiss Ornithological Institute Sempach

Billions of insects, birds and bats use the aerosphere for migration, dispersive movements or foraging. This enormous movement of biomass plays a key role in ecology. Monitoring aerial movements is technically challenging. Individual tracking devices have been increasingly used over the last decade but these are currently only suitable for relatively large organisms, and the associated costs limits monitoring to a very small sample. Radars provide a tool for investigating and quantifying movement patterns for a wide range of flying organisms (birds, bats and insects). This talk presents the ongoing research at the Swiss Ornithological institute on this topic. More than 40 years ago, we started with manual tracking of single targets and using “human brain classifier” to identify targets based on the radar signatures. Nowadays, we are developing automated recording systems with machine-learning tools to identify and quantify bird and insect movements in near real-time. Only recently, data from networks of weather radars systems are available for the scientific community, enabling monitoring the spatial and temporal movement patterns on a continental scale. In addition, we also apply miniaturized data-loggers on individual migratory birds to track their year-round movements to Africa and back. Altogether, we are aiming on using the recent technological progress to monitor the movement of birds (and others) in the aerosphere to improve our understanding of biological processes. The talk will give the biological background, but will have a main focus on the technology applied.

Freitag, 03.11.2017

AWK the project factory - insights to IT in Swiss organisations

Zeit: 10:15 Uhr
Hörsaal: A97
Dr. Ansgar Schanz
AWK Group AG
3008 Bern

As an independent Swiss company, AWK Group advises its clients on matters relating to information technology and leads demanding projects along the path to success, as demonstrated by more than 4000 successfully implemented projects in various sectors. AWK has more than 220 employees at four locations and is among the most attractive Swiss employers for engineers, computer scientists, physicists and economists. The unique combination of expertise in consulting, engineering and project management enables AWK to offer comprehensive support to its clients. Examples include strategy development, system procurement and management of large-scale projects.

The seminar gives an authentic insight to the work as IT Consultant at AWK Group in Switzerland.

Freitag, 10.11.2017

From academia to business: A culture shock?

Zeit: 10:15 Uhr
Hörsaal: A97
Dr. Dominik Scheiben
Casualty Risk Engineer
Global Casualty Risk Engineering
Insurance XL Catlin

I have graduated from the Institute of Applied Physics as PhD in 2013 and soon after started my work life outside of academia in the insurance industry. XL Catlin is a global insurance company with approximately 7400 employees and more than 100 offices in Africa, Asia, Australia, Europe, North America and South America. The core competence of XL Catlin is industrial liability and property insurance. Our clients range from small family-run companies to large multinational corporations of every type of industry. I am working at XL Catlin within the Casualty Risk Engineering group. We are a group of engineers and scientists, each with a different background. We act as consultants for our underwriters to analyse and assess the liability risks of our clients from a technical perspective. Part of our job is the development of tools and scientific models for risk assessment and evaluation. This seminar will provide an insight on the transition from academia into the private sector and will show that natural scientists are valuable professionals even in non-technical businesses such as in the insurance industry.

Freitag, 17.11.2017

Lagrangian Analysis of Weather Systems

Zeit: 10:15 Uhr
Hörsaal: A97
Dr. Michael Armand Sprenger, Institut für Atmosphäre und Klima, ETH Zürich

The dynamical tropopause of the extra-tropics acts as a barrier to stratosphere–troposphere mass exchange (STE). Any transport across this barrier is necessarily associated with diabatic or frictional processes such as turbulence, radiative forcing or condensational heating. Most of these processes are linked to distinct flow phenomena and hence with distinct signatures of the velocity and other meteorolocical fields. This presentation provides a Lagrangian methodology how to diagnose STE and discusses the structure and the dynamics of the tropopause related to this exchange. In particular, a 30-year global climatology of STE will be shown, and distinct case studies will be used to study the dynamical processes at the tropopause.

Donnerstag, 30.11.2017

Full day excursion to the World Radiation Center in Davos

Zeit: 07:30 Uhr
Hörsaal: Davos
Christine Aebi

Freitag, 22.12.2017

Millimetre Wave Radar: Research with Security Scanners, Boats, Volcanoes, Drones, Frogs & Geckos

Zeit: 10:15 Uhr
Hörsaal: A97
Dr David MacFarlane
Millimetre Wave and EPR Group, School of Physics and Astronomy
University of St Andrews, Scotland

Over the last 15 years the Millimetre Wave group at the University of St Andrews, Scotland, have designed, built and deployed millimetre wave radar systems for field use by a wide variety of academic and commercial partners. Millimetre wave radar offers the ability to gather high resolution remote sensing data using a portable ground based instrument in conditions where optical techniques fail. In this talk I will give an introduction to low power FMCW radar theory and show how our radars have been developed to maximise performance using this technique. Working at frequencies from 30 to 300 GHz for applications varying from close range, high resolution, real time security scanning to telemetered long range 3D topographic survey of volcanic lava domes, I will then give an overview of our radar projects past, present and future.

Freitag, 12.01.2018

Research and Prospect of Geostationary Orbit Microwave Sounding Technology

Zeit: 10:15 Uhr
Hörsaal: A97
Mr. Zhenchao Xie
Mr. Lifei Jiang
Shanghai Spaceflight Institute, China

There is no geostationary orbit microwave sounding instrument working in the space. The meterological requirement of Geostationary orbit microwave sounding was analyzed. The comparison between real aperture and synthetic aperture design was shown in detail. An 1m aperture prototype was manufactured to verify the design. A 25kg microwave radiometer was installed in FY-4A and lauched into GEO to carry out experiments. The observation of its data was analyzed. The full aperture radiometer was designed and some subsystem was manufactured and tested.

New Concept of Spaceborne Terahertz Sounding

The progress in the studies of ice cloud and atmospheric trace gases detection was introduced. According to the application requirements, an integrated detector of ice cloud and atmosphere trace gas was designed to improve the retrieval accuracy through the integrated detection. The detector can meet all the high-precision detection demand of climate and weather forecast in the future.