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Tapered anechoic chamber - Patent 6437748 A tapered anechoic chamber according to claim 3 wherein said periodic pattern is selected from the group consisting of sinusoidal patterns, semi-sinusoidal patterns, and Chebyshev patterns. A tapered anechoic chamber according to claim 1 wherein said at least one portion of said electromagnetic energy absorbing material comprises the inner surfaces of said four tapered side walls. A tapered anechoic chamber according to claim 19 wherein said periodic pattern is selected from the group consisting of sinusoidal patterns, semi-sinusoidal patterns, and Chebyshev patterns. www.freepatentsonline.com /6437748.html   (4770 words)

Microwave program - Anechoic chamber The idea to design and build a microwave anechoic chamber and antenna data acquisition system for teaching and research in the areas of Antennas, EMC, and EMI was actively pursued in the spring semester of 1996. It was decided that the design and construction of the anechoic chamber and antenna data acquisition system shall be accomplished by the students and faculty members of the department of Electrical and Computer Engineering. The anechoic chamber and the antenna data acquisition system is being used for instruction in the Microwave and Wireless Engineering laboratory course and, graduate and senior undergraduate capstone projects. cegt201.bradley.edu /rfpage/anechoic/anechoic.shtml   (331 words)

Anechoic chamber An anechoic chamber is a room that is isolated from external sound or electromagnetic radiation sources, sometimes using sound proofing, and prevents the reflection of wave phenomena (reverberation). Anechoic chambers are widely used for measuring the acoustic properties of acoustic instruments, measuring the transfer functions of electro-acoustic devices, testing microphones and performing psychoacoustics experiments (such as measuring the quality of audio codecs or measuring head-related transfer functions). Anechoic chambers for electromagnetic radiation absorption are used in the aerospace industry for radar cross section measurement, among other areas. www.xasa.com /wiki/en/wikipedia/a/an/anechoic_chamber.html   (303 words)

EM Simulation Software Helps Optimize EMC Anechoic Chamber Anechoic chambers equipped with absorber material to dampen the reflection of electromagnetic waves are used to qualify electronic devices for radiated interference and susceptibility. The challenge in designing an anechoic chamber is to minimize the dimensions without increasing the wall reflection of the test chamber. Engineers simulating the chamber must deal with the large dimensions of the structure in comparison with the wavelength and the complexity of the biconical antenna used. www.rfglobalnet.com /content/news/article.asp?docid=43daf212-362c-4d46-9d11-84daff93abf0   (471 words)

Acoustics: Anechoic Chamber The Murray Hill anechoic chamber, built in 1940, is the world's oldest wedge-based anechoic chamber. Most current anechoic chambers utilize the alternating wedge pattern that was first used in the Murray Hill chamber. The anechoic chamber has been used to for psychoacoustic work relating to loudness. www.bell-labs.com /org/1133/Research/Acoustics/AnechoicChamber.html   (339 words)

Acoustic Test Chambers and Environments- Developer Zone - National Instruments Steel panel chambers are, however, not exceptionally effective for sound absorption testing: the elevated sound absorption at low frequencies may approach the limits tolerated by the standards, and may make it difficult to resolve low sound absorption values which are typical at low frequency. A free-field chamber is an approximation of a hemi-anechoic chamber. Free-field chambers are also used for sound intensity testing, where their primary function is to control ambient noise and to increase the accuracy of intensity measurements by reducing sound reflections. zone.ni.com /devzone/cda/tut/p/id/264   (3154 words)

Randtron Antenna Systems Anechoic Chambers Anechoic Chamber facilities are specially designed and automated, achieving the convenience and speed required for accurate data gathering and reduction. Our anechoic chambers are equipped with a unique, low reflection model tower used for antenna mounting when conical patterns are required in aircraft coordinates. All chambers are equipped with very wideband, rotatable, linear polarized horns, which have the capability of automatic selection of horizontal, vertical, slant, and rotating linear polarization. www.l-3com.com /randtron/chambers.htm   (1081 words)

Oshex Associates - Anechoic Chambers Anechoic Chambers are echo-free enclosures with a sound energy absorption level of 99% to 100%, or a reflected sound pressure level of 10% or less. Chamber linings are installed on roll formed wedge tracks attached to wall and ceiling surfaces by means of a "Z" bar mounting system. Anechoic wedges are mounted on the interior surface of the cabinet. www.oshex.com /anechoicchambers.asp   (1885 words)

Anechoic chamber - Institute for Microstructural Sciences The anechoic chamber is a testing facility intended to reproduce acoustic free-field conditions in a controlled environment. The chamber consists of an outer shell of concrete block and reinforced concrete surrounding an inner room of steel-panel contruction which is mounted on springs to isolate it from the effects of vibration. The walls inside the chamber are lined with fibreglass wedges with a square base measuring 61 cm on each side and 82 cm in length. ims-ism.nrc-cnrc.gc.ca /asp/chamber_e.html   (230 words)

Anechoic chamber - Definition, explanation John Cage, a 20th century composer, cited his experience in Harvard University's anechoic chamber in the 1940s — a room in which he expected to hear nothing, but heard instead the sound of his own blood and nervous system — as the inspiration for his famous "silent" composition, 4' 33". We are manufacturer for anechoic chamber and other acoustics room also in the noise control application. We are manufacturer for anechoic chamber and other acoustics room also in the noise... www.calsky.com /lexikon/en/txt/a/an/anechoic_chamber.php   (424 words)

IIT/FDRC (HSJF) anechoic chamber shadowgraph/schlieren   (Site not responding. Last check: ) The anechoic chamber is 176 inches in length from inlet to exit and has a square cross-section of 100 inches. The inner chamber surfaces and the laboratory walls outside the open ends of the chamber are lined with sound absorbing acoustic foam. The chamber has a total of 6 removable sections, two of which have optical inserts to allow access for the shadowgraph/schlieren flow visualization system. fdrc.iit.edu /hsjet/acss.html   (151 words)

Anechoic Chamber Construction The Anechoic Chamber entrance sound attenuating doors can be fabricated in a variety of designs, including swing-in or swing-out hinged type, sliding-wall type, or track-riding type. Electrical power, wiring, and other services are introduced into the anechoic chamber by pipe sleeves that pass through the basic structure and wedges. Anechoic Chambers shall be isolated from structural vibration by one of the following systems. www.eckeleurope.co.uk /cons.htm   (766 words)

ANECHOIC Wedge & Chamber Construction Since Anechoic Chamber Wedges are not designed to support heavy loads, a working floor must be provided over the top of the floor wedge points. The ventilation system in the Eckel anechoic chamber is designed to maintain a uniform temperature, provide fresh air for humans and/or animals and facilitate proper combustion in air-consuming equipment. Eckel provides engineering or design data pertinent to the support of any type of equipment within an anechoic chamber upon request to the purchasers, and their consultants or engineers. www.collhealth.com /accoustical_sales/anechoic_wedge_Chmb_const.html   (726 words)

University of Nevada, Reno -- Department of Electrical Engineering [UNR Anechoic Chamber] The University of Nevada, Reno has one of the largest university antenna anechoic chambers in the western United States. The instrumented facilities are available to interested parties for both antenna pattern measurement and electromagnetic compatibility and susceptibility measurements on either a lease or research contract basis. The facility is 15 by 30 by 11 feet in size with an adjacent 9.5 by 12 foot screen room with instrumentation. www.ee.unr.edu /chamber.html   (162 words)

Software predicts anechoic chamber performance: News from Flomerics Simulation accuracy is critical in designing anechoic chambers because the ANSI C63-4 and EN50147-2 standards used for electromagnetic compatibility (EMC) require that the finished chamber be able to duplicate the performance of an open area test site within +/-4dB. Anechoic chamber manufacturer Siepel has validated the ability of MicroStripes software to meet the accuracy requirements while reducing compute time to only 5% of the time required by the software used in the past. Anechoic chambers equipped with absorber material to dampen the reflection of electromagnetic waves are used to qualify electronic devices for radiated interference and susceptibility. www.electronicstalk.com /news/flo/flo173.html   (581 words)

McIntosh Anechoic Chamber The purpose of an anechoic chamber is to provide a reflection free environment for acoustic tests. A similar arrangement at the opposite diagonal of the chamber is for the air input to the chamber. The free field characteristics of the chamber were confirmed by placing a wide-range coaxial sound source at one end of the chamber and the microphone at the other end. www.roger-russell.com /cham2pg.htm   (2229 words)

What is an Anechoic Chamber? An anechoic chamber is a room with special walls that absorb as much sound as possible. Anechoic chambers are frequently used for testing microphones, measuring the precise acoustic properties of various instruments, determining exactly how much energy is transferred in electro-acoustic devices, and performing delicate psychoacoustic experiments. Research in anechoic chambers regarding the specific ways in which the human head reflects sound energy has lead to the development of speakers that project virtual sound around the listener. www.wisegeek.com /what-is-an-anechoic-chamber.htm   (394 words)

Radiometrics Midwest Corp. The chamber boasts a 20-foot turntable with a load capacity in excess of 25,000 lbs. For vehicle and large heat generating equipment it is equipped with a 25,000 CFM air handler and a separate exhaust handler. The chamber fully meets the Normalized Site Attenuation (NSA) requirements and is used for most 3 meter measurements take at Radiometrics. www.radiomet.com /facilities/largeSemiAnechoicChamber.html   (132 words)

Microwave program - Anechoic chamber Work on the characterization of the anechoic chamber is in progress. The intent was to measure the capabilities of the anechoic chamber by determining the extent of the quiet zone and other specifications. The radiation characteristics of a horn antenna was measured in the chamber. cegt201.bradley.edu /rfpage/anechoic/Characterization.shtml   (62 words)

Spaceflight Now | Breaking News | X-43A vehicle tested in largest anechoic chamber Housed in the BAF is the anechoic chamber, a building within a building. Anechoic chambers are specialized facilities that provide an electromagnetically controlled test environment. Measuring 264 x 250 x 70 feet, the BAF's anechoic chamber is the largest in the world, capable of testing planes as big as the B-52 and C-17. www.spaceflightnow.com /news/0002/16x43aanechoic/index.html   (532 words)

Sonex Super is an anechoic wedge foam used primarily in rooms and chanbers to create ideal testing anvironments. Sonex Super is an anechoic wedge foam used primarily in rooms and chanbers to create ideal testing anvironments. Anechoic chambers are used to achieve free field conditions. Anechoic wedge foam can be used in a variety of industries that require extremely high levels of sound absorption. www.sonexfoam.com /applications/anechoic_chambers.html   (119 words)

C.S.S.L. Anechoic Chamber Instructional Work   (Site not responding. Last check: ) The anechoic chamber is being used in 402W; this is a design and writing course for the electromagnetics and optics area. The chamber, which is located in Room 329 E.E. East, provides a quiet, free-space like environment for testing the radiation patterns of antenna designs. The antenna is constructed and the actual pattern is measured with the antenna mounted in the chamber. www.engr.psu.edu /ee/cssl/anechoic_chamber/Inst_use.html   (195 words)

Oticon International - The anechoic chamber   (Site not responding. Last check: ) This chamber is designed to minimize sound reflections as well as external noise. External sound is excluded by physical isolation of the structure, by elaborate acoustic filters in the ventilation ducts, and by thick masonry walls. Sound reflection can be reduced to one part in 1,000 in such a room, thus simulating the acoustical conditions of unobstructed free space. www.oticon.com /eprise/main/Oticon/com/SEC_AboutUs/AboutEriksholm/CNT01_AnechoicChamber   (106 words)

NIOSH Mining: Facility - Anechoic Chamber | CDC/NIOSH The chamber was recently used in an experiment to determine the effects of sound source position on measured noise exposure. For the experiment, it was necessary to insure that measurements were made in an environment that was free of acoustic reflections down to 150 Hz. The chamber can also be used for measuring the sound power of small devices. www.cdc.gov /niosh/mining/aboutus/facilitydetails16.htm   (110 words)

Meyer Sound : The Anechoic Chamber Most anechoic chambers of any meaningful size and quality are owned by universities, or by government agencies such as NASA and the military. An anechoic chamber is still the only way to reliably gather this data. The effectiveness of an anechoic chamber is measured in dB of rejection,which is the ratio of direct sound to reflected sound inside the room. www.meyersound.com /products/technology/chamber.htm   (1557 words)

Anechoic Chambers: Interesting Thing of the Day Because the floor, ceiling, and even the door of an anechoic chamber must be kept as free as possible of reflective surfaces, the working area is a small stage suspended in the very center of the room, accessed by a long walkway. But the important thing for the technicians testing audio equipment in the chamber is that if they’re measuring the sensitivity of a microphone or the output of a speaker, they can be certain that only the sounds they deliberately generate inside the room have an effect on their test equipment. Although anechoic chambers were originally designed as places free of sound echoes, the term “anechoic chamber” is also used to describe a type of room specially designed and shielded to prevent the reflection of radio waves and other electromagnetic radiation. itotd.com /articles/338/anechoic-chambers   (1323 words)

anechoic chamber free to good home A friend of one of our club members, is closing an antenna business he has had for many years, and is donating much of the test equipment to our club. Of course, each wall section has anechoic foam attached, and so handling each section has to be done with some care. In the meantime, the individual who owns all this, has to be off the property by the 15th of November, so fast action is definitely required. www.amsat.org /amsat/archive/amsat-bb/200311/msg00045.html   (361 words)

Sacramento State - Department of Physics and Astronomy The Sacramento State anechoic chamber and associated acoustics capability is a major, unique facility of the Department of Physics and Astronomy. This two-story, walk-in chamber is used to conduct accurate sound measurements. The chamber is floating on an independent foundation, further decoupling it from building vibrations. www.csus.edu /physics/facilities/anechoicchamber.stm   (134 words)

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