Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sound Filters Light

01.11.2004


Russian researchers have developed a small, smart and tolerant to vibrations spectrometer, which is equally reliable in the outer space and in oceanic depths. The development was performed with financial support from the Russian Foundation for Basic Research (RFBR) and the Foundation for Assistance to Small Innovative Enterprises (FASIE). The unique device is based on a completely new principle: the light goes through an acoustooptical filter in the device.



Specialists of the Scientific & Technical Center for Unique Instrument-Making produce unique devices with enviable regularity. The new spectrometer developed with support the RFBR and FASIE by a group under the direction of Vladislav Pustovoit, academy member, is also unique. Such spectrometer would not have to spend precious seconds to switch over from, for example, one wave-length to another – this is inevitable evil of similar classical devices for measuring light intensity at different wave-lengths. The device is tolerant to shaking and takes up little space, therefore it can be taken on board the spaceship, let alone a small search aircraft. The device can be even carried in a pocket.

Such a device due to its compactness and high sensitivity can be applied in multiple areas: from industrial processes control through biomedical applications. For example, the device may be useful for ecologists. It allows to determine instantly what unscrupulous enterprises contaminate water and air with. The device can do that in complicated conditions – at a distance, upon quick reciprocal movement of the carrier and the object. Thus, flying over the sea, the pollution source may be quickly found by reflected light. The device would help to find the pipe from which poisonous drainage gets to the sea and to determine what contaminating agents are pored into the sea from that pipe. This can be done without water sampling and other routine analysis.


The device action is based on a new principle – phenomenon of light diffraction on acoustic waves in crystals. It is known that the crystal refraction index is a constant value for each specific transparent medium. However, if a sound-wave acts upon such transparent medium, then the refraction index will slightly change. If a sound-wave diffuses in the crystal, then occurs the space-periodic structure of the medium refraction index alteration, and then the fireballs incident from the outside will diffract on that structure. Diffraction efficiency depends on the sound-wave amplitude. Consequently, arousing a sound-wave in the crystal can manage its optical properties. The spectrometer action is based on this principle.

The critical part of any spectrometer is the optical filter or gitter, which singles out the light of a certain wave-length from the entire radiation spectrum. In the majority of cases, complicated mechanical tunable devices are used for this purpose. Time is always required to switch the device over from one wave-length to another, retuning may take as long as several dozens of seconds.

The device developed by the Scientific & Technical Center for Unique Instrument-Making (Russain Academy of Sciences) does not suffer from sluggishness. Electric signal instantly makes the piezo-crystal plate vibrate at intended frequency, thus arousing a sound-wave in the crystal, and electric signal’s frequency alteration immediately results in alteration of the acoustic wave period. That also results in a quick alteration of the crystal’s optical properties. Thus, a tunable optical filter (the so-called acousto-optical filter) is in place, it is easy to manage and retune.

One more advantage of the optoacoustic spectrometer is high resolution and the ability to register very weak radiation. As such spectrometer has no mechanically moving parts, it is not afraid of vibrations and shaking. Besides, it is much lighter and smaller than ordinary spectrometers. So, it can really be taken on board the spaceship to investigate, for example, the spectrum of sunlight reflected from the ocean surface or the spectrum of any other radiation.

Sergey Komarov | alfa
Further information:
http://www.informnauka.ru

More articles from Physics and Astronomy:

nachricht Tracing aromatic molecules in the early universe
23.03.2017 | University of California - Riverside

nachricht New study maps space dust in 3-D
23.03.2017 | DOE/Lawrence Berkeley National Laboratory

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

When Air is in Short Supply - Shedding light on plant stress reactions when oxygen runs short

23.03.2017 | Life Sciences

Researchers use light to remotely control curvature of plastics

23.03.2017 | Power and Electrical Engineering

Sea ice extent sinks to record lows at both poles

23.03.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>