Airplanes generate trailing wake vortices which can be dangerous for following aircraft, especially on takeoff and landing. An onboard laser measuring device scans the air space in front of the plane, recognizes turbulence and will inform the pilot.
The volume of air traffic is constantly rising - many air routes are already overloaded. Frequent delays are encountered when machines are taking off and landing at major airports. The frequency of aircraft cannot be increased because they have to maintain a safety distance of up to six miles (11.1 kilometers). It is to ensure that the following airplane is not endangered by the vortex drag of the machine in front. This across-the-board safety distance is often more generous than required. If the position and the actual extent of the air vortex could be directly measured, the safety distance could be adjusted to the actual circumstances and shortened. Airports could then use their capacity to better effect.
“In the EU project I-Wake we are cooperating with eight teams from four different countries to develop a sensor which can determine whether the air is calm enough for a safe takeoff,” explains Thomas Peschel from the Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena. “The optical scanner can recognize any turbulence and in future could deliver rapid and reliable measured results on board commercial aircraft. A prototype is currently being tested on a small Cessna plane.” The measurement principle is relatively simple: A laser sends pulses into the air space in front of the aircraft. The light is scattered on aerosol or dust particles and registered by a detector. As a result of the Doppler effect, the wavelength of the incoming laser pulses is shifted according to whether the airborne particles are moving towards or away from the beam. From the difference relative to the incident wavelength, a software system calculates the strength of air turbulences within fractions of a second.
Johannes Ehrlenspiel | alfa
New players, standardization and digitalization for more rail freight transport
16.07.2018 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
A helping (Sens)Hand
11.04.2018 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO
Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz (Germany) together with scientists from Dresden, Leipzig, Sofia (Bulgaria) and Madrid (Spain) have now developed and characterized a novel, metal-organic material which displays electrical properties mimicking those of highly crystalline silicon. The material which can easily be fabricated at room temperature could serve as a replacement for expensive conventional inorganic materials used in optoelectronics.
Silicon, a so called semiconductor, is currently widely employed for the development of components such as solar cells, LEDs or computer chips. High purity...
Augsburg chemists present a new technology for compressing, storing and transporting highly volatile gases in porous frameworks/New prospects for gas-powered vehicles
Storage of highly volatile gases has always been a major technological challenge, not least for use in the automotive sector, for, for example, methane or...
When we put water in a freezer, water molecules crystallize and form ice. This change from one phase of matter to another is called a phase transition. While this transition, and countless others that occur in nature, typically takes place at the same fixed conditions, such as the freezing point, one can ask how it can be influenced in a controlled way.
We are all familiar with such control of the freezing transition, as it is an essential ingredient in the art of making a sorbet or a slushy. To make a cold...
Thin organic layers provide machines and equipment with new functions. They enable, for example, tiny energy recuperators. In future, these will be installed...
Das Zusammenspiel aus Struktur und Dynamik bestimmt die Funktion von Proteinen, den molekularen Werkzeugen der Zelle. Durch Fortschritte in der...
17.10.2018 | Event News
16.10.2018 | Event News
02.10.2018 | Event News
22.10.2018 | Ecology, The Environment and Conservation
22.10.2018 | Physics and Astronomy
22.10.2018 | Medical Engineering