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Topic: Ring laser gyroscope

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Laser science

Laser

Inertial platform

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Sagnac interferometer

Inertial guidance system

Gyroscope

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Interference

Vibrating structure gyroscope

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Angular momentum

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	Ring laser gyroscope - Wikipedia, the free encyclopedia
		Physically, an RLG is composed of segments of transmission paths configured as either a square or a triangle and connected with mirrors.
		A laser is launched into the transmission path in both directions, establishing a standing wave resonant with the length of the path.
		A related device is the fiber optic gyroscope which operates similarly to the ring gyro, but implementing transmission paths with a coiled fiber optic cable.
	en.wikipedia.org /wiki/Ring_laser_gyroscope (458 words)

	Gyroscope - Wikipedia, the free encyclopedia
		A gyroscope is a device for measuring or maintaining orientation, based on the principle of conservation of angular momentum.
		The gyroscope effect was discovered in 1817 by Johann Bohnenberger and invented and named in 1852 by Léon Foucault for an experiment involving the rotation of the Earth.
		Gyroscopes can be used to construct gyrocompasses which complement or replace magnetic compasses (in ships, aircraft and spacecraft, vehicles in general), to assist in stability (bicycle, Hubble Space Telescope, ships, vehicles in general) or be used as part of an Inertial guidance system.
	en.wikipedia.org /wiki/Gyroscopes (1476 words)

	Wikinfo \| Gyroscope (Site not responding. Last check: 2007-09-07)
		A gyroscope is a device which demonstrates the principle of conservation of angular momentum, in physics.
		Gyroscopes can be used to construct gyrocompasses which replace magnetic compasses (in aircraft and spacecraft), to assist in stability (bicycle, Hubble space telescope), as a repository for angular momentum (momentum wheels) and as a means to conserve and deliver energy (flywheel energy storage) in some machines.
		where the vectors τ and L are the torque on the gyroscope and its angular momentum, the scalar I is its moment of inertia, the vector ω is its angular velocity, and the vector α is its angular acceleration.
	www.wikinfo.org /wiki.php?title=Gyroscope (517 words)

	Science and Technology Perspectives (Site not responding. Last check: 2007-09-07)
		The key properties of the laser that make the laser gyroscope possible are the laser's coherent light beam, its single frequency, its small amount of diffusion, and its ability to be easily focused, split, and deflected.
		In the laser gyroscope, the two counterrotating laser beams travel around a closed circuit or ring, which is usually rectangular or triangular.
		The laser gyroscope is a viable contender for almost all military and commercial applications, including military and commercial aircraft, tactical and strategic missiles, naval and marine vehicles, land vehicles and weapon platforms, and spacecraft.
	www.airpower.maxwell.af.mil /airchronicles/aureview/1985/may-jun/siuru.html (1557 words)

	SCHOTT AG - - Online Magazine - English - Info95 - Si095_04_laser
		Ring lasers are such an alternative — although not of the type that is used in compass systems for airplanes.
		Schreiber: “With the ring laser we were able to “see” the disastrous earthquake that occurred last year in Turkey — in spite of the fact that it occurred on the opposite side of the globe.
		However, the thermal expansion of the 4.25 meter diameter monolith for the Wettzell ring laser had to be smaller than that of the prototype.
	www.schott.com /magazine/english/info95/si095_04_laser.html (1164 words)

	Wikinfo \| Laser (Site not responding. Last check: 2007-09-07)
		Lasers are classified by wavelength and maximum output power into safety classes, from class I (inherently safe; no possibility of eye damage even from hours of direct exposure) to class IV (highly dangerous; even non-direct scattering of light from the beam can blind).
		Holmium-doped glass, a high-power laser operating in the infrared, it is explosively absorbed by water-bearing tissues in sections less than a millimeter thick.
		Laser is a resin produced by the silphium plant, also called laserwort, and a genus of the family Apiaceae.
	www.wikinfo.org /wiki.php?title=laser (1036 words)

	Solid state fiber optic semiconductor ring laser gyro apparatus with non-optical readout - Patent 4913548
		The present invention generally relates to ring laser gyroscopes, and more particularly, relates to fiber optic ring laser gyros, and even more particularly, is concerned with solid state semiconductor fiber optic ring laser gyroscopes with non-optical readouts.
		Fiber optic ring laser gyros typically have as one of their components, an optical readout device for analyzing the frequency of light signals that are split off from the ring.
		1 is a schematic representation of a fiber optic ring laser gyro, of the prior art, which utilizes a optical detector in conjunction with a fiber optic directional coupler.
	www.freepatentsonline.com /4913548.html (1600 words)

	armada international: 1/00-002 (Full Article)
		Development of ring laser angular rate sensors (usually referred to as ring laser gyros, although they lack the traditional rotating mass of the mechanical gyroscope) started in the mid?1960s, when the technology was seen as a potentially more reliable replacement for the mechanical gyroscope.
		Ring laser angular rate sensors generally take the form of a laser operating within a ring-shaped conduit within a monolithic solid block of glass.
		The shortcomings of the mechanically dithered gyroscope led several companies to devote extensive research to the possibility of creating an alternative RLG configuration known as a 'multi-oscillator', in which the clockwise and counter-clockwise beams would be at separate frequencies.
	www.armada.ch /00-1/002.htm (3529 words)

	04.10.97 - UC Berkeley physicists develop ultrasensitive gyroscope based on superfluid helium
		Their prototype superfluid gyroscope already is quite sensitive and they believe its sensitivity will eventually surpass that of the ring laser gyroscope, a highly sensitive device used in advanced commercial aircraft inertial guidance systems.
		The gyroscope is based on the fact that superfluids such as helium-4 have an uncanny ability to sense absolute rotation.
		The superfluid gyroscope works because of a well-known property of superfluids: if you travel around any closed loop in the fluid you find that the net flow is zero.
	www.berkeley.edu /news/media/releases/97legacy/gyroscope.html (1158 words)

	ECE Alumni News - Winter 2002-03 - Killpatrick: A pioneer in developing the ring laser gyroscope
		Killpatrick and his fellow Honeywell team members formulated and patented a new design for the laser gyro, resulting in a self-contained, inertial sensing device that turned out to be very reliable.
		The laser gyroscope provides data regarding the aircraft's pitch and roll, location over the earth's surface, and flight accuracy.
		Nearly 40 of those years were concentrated on the laser gyro and three fourths of Killpatrick's 44 patents have to do with the laser gyro development.
	www.ece.uiuc.edu /alumni/w02-03/killpatrick.html (736 words)

	BSSA, Volume 88:6 (Site not responding. Last check: 2007-09-07)
		Coupling mechanisms and detection thresholds are discussed for ring laser gyroscope measurement of seismic rotation, and simultaneous records from a ring laser and a standard EARSS seismograph 230 km from an M
		Power spectral densities for the ring laser and for the seismograph signals are enhanced in the 0.2- to 10-Hz range by up to 18 and 60 dB, respectively, over the noise floors (-160 dB, of order nanoradians per second, and -130 dB, respectively).
		These ring laser signals have magnitudes consistent with the amplitude of the standard seismograph record.
	www.seismosoc.org /publications/BSSA_html/bssa_88-6/98015.HTM (115 words)

	Laser Gyroscope Directory - Laser Gyroscope Portal (Site not responding. Last check: 2007-09-07)
		In the ring laser gyroscope, laser beams are split.
		Researchers in new mexico have designed and fabricated a pair of semiconductor ring lasers on a single chip and have observed a beat note when the outputs.
		A small mass imbalance defines the shape of the modes in that it causes the node lines of the vibrational pattern to lie along 1 a line that runs through the geometric center of the structure and the location of the mass imbalance and 2 a line perpendicular to the aforementioned line.
	www.gyroscope-resource.info /laser-gyroscope.html (848 words)

	How the ringlaser gyroscope work? (Site not responding. Last check: 2007-09-07)
		The measurement principle of the ring laser gyroscope is based on two laser beams that are deflected by three mirrors along a triangular route.
		As long as this construction remains at rest, both laser beams require exactly the same time for the cycle.
		If, however, the system is rotated, the rotational path for one of the two laser beams is then shortened, while the path of the other beam lengthens.
	www.pruftechnik.com /alignment/products/paralign/paralign6.htm (99 words)

	Roller alignment with PARALIGN
		When the gyroscope is rotated on its axis, one of the lasers’ rotational paths is shortened while the other beams’ path is lengthened.
		PARALIGN consists of three ring laser gyroscopes, enabling is to take measurements in three-dimensional space.
		the laser gyroscopes are adjusted for the earth's rotation.
	www.pruftechnik.com /alignment/products/paralign/paralign_faq.htm (1082 words)

	Sam's Laser FAQ - Laser Instruments and Applications
		If a laser beam is scanned across a 3-D object, and the spot is viewed (by optical sensors) from two different locations, it is possible to determine the instantaneous distance to the spot (on the object).
		Laser Atlanta Optics is an example of a company that specializes in laser based distance and speed measureing technology.
		An alternative is to take a laser, collimate the light to obtain plane wave illumination, place the image anywhere between the source and the lens, and find the FT plane at the focal distance on the other side of the lens.
	www.kellerstudio.de /repairfaq/sam/laserlia.htm (20415 words)

	[No title]
		The C-II ring laser project involves a multinational and multi-institutional collaboration (as detailed in the acknowledgements).
		These results, and in particular the reduction of drift to a few millihertz, are reassuringly close to the original projections, and augur well for the eventual performance of C-II reaching the parts-per-million level (of the Sagnac frequency) precision as proposed in its original conception.
		This indicates that the C-II laser system is fulfilling its intended purpose of acting as a prototype and testbed for the much larger (4 m x 4 m) laser G, itself proposed for the detection of short-term fluctuations in Earth rotation (Bilger et al.
	www.phys.canterbury.ac.nz /research/laser/stuttgart97.shtml (1297 words)

	Canterbury Ring Laser Project - Physics and Astronomy - University of Canterbury
		On the detectability of the Lense-Thirring field from rotating laboratory masses using ring laser gyroscope interferometers,
		Laser stability and beam steering in a nonregular polygonal cavity,
		Ring laser for precision messurement of non-reciprocal phenomenas,
	www.phys.canterbury.ac.nz /research/laser/ring_publications.shtml (1050 words)

	Laser (Site not responding. Last check: 2007-09-07)
		Laser (US Air Force) A laser ('''Light Amplification by Stimulated Emission of Radiation''') is a device which uses a quantum mechanical effect, stimulated emission, to generate a coherent beam of light from a lasing medium of controlled purity, size, and shape.
		By contrast, a Laser generally emits photons in a narrow, well-defined, polarized, coherent beam of near-monochromatic light, consisting of a single wavelength or hue.
		In 1964, Charles Townes, Nikolai Basov and Alexandr Prokhorov shared a Nobel Prize in Physics "for fundamental work in the field of quantum electronics, which has led to the construction of oscillators and amplifiers based on the maser-laser principle." Laser Light can be highly intense&8212;able to cut steel and other metals.
	laser.iqnaut.net (2162 words)

	General Optics: A World of Ultra Precision Optics
		General Optics has been a premier supplier of ring laser gyroscope (RLG) optics and frames since this industry was first commercialized.
		These critical optical components have been utilized in defense and aerospace platforms and are crucial to the precise navigation of many land and air devices.
		The requirements for these components are very stringent and only optical manufacturers that have mastered super-polishing, optical contacting, precision optical machining, and high reflectivity IBS coatings are capable of serving this industry.
	www.generaloptics.com /products/ring.php (274 words)

	The Linear Sagnac Effect and Freefall Accelerometer
		The linear laser is easier to handle compared to a ring laser.
		It consists of two lasers L1 and L2 with semitransparent mirrors M2 and M3, beam splitter BS and two photodiodes PD1 and PD2 based on a solid platform.
		The use of two lasers eliminates the lock-in of the frequencies allowing measurement of very low beat frequencies.
	www.wbabin.net /yuri/keilman5.htm (1044 words)

	UNM 5,650,850 (Site not responding. Last check: 2007-09-07)
		Current laser gyroscopes are large, expensive, complex, and require a constant mechanical motion to respond to all rotations.
		The present invention is a miniature laser gyroscope that has no moving parts, and thus is inexpensive and has a long lifetime.
		It uses semiconductor rather than gas lasers, and is not subject to lock-in effects.
	www.unm.edu /~scitech/5650850.html (88 words)

	OPTICAL BIASING OF RING LASER GYROSCOPE BY QUANTUM WELL MIRROR,
		The purpose of the QWM is to optically bias the ring gyroscope (RLG) out of the lock-in region.
		This is accomplished by shifting the apparent plane of reflection within the QWM by applying a voltage to the electrodes which control the optical filter.
		This device will reduce cost of the RLG by Removal of the mechanical dither hinge assemblies Removal of the high voltage circuitry used to drive the dither hinge Removal of the path length controller assemblies.
	quanterion.com /Documents/Documents.asp?ArgVal=709 (194 words)

	[No title]
		Bidirectional operation and gyroscopic properties of an homogeneously broadened ring laser.
		Frequency locking and unlocking in a femtosecond ring laser with the application to intracavity phase measurements.
		Short pulse ring lasers to create an atomic clock combining a wavelength and time standard in a sensitive gyro.
	www.chtm.unm.edu /diels/newpublications.html (1565 words)

	04.23.97 - Turn, Turn, Turn
		An ultrasensitive, superfluid gyroscope developed by physicists here has the potential to surpass today's most sensitive devices for measuring absolute rotation or spin.
		In a paper in an April issue of Nature, physics professor Richard Packard and his colleagues, graduate students Keith Schwab and Niels Bruckner, report a proof-of-principle demonstration of the new device.
		He predicts that, if he and his colleagues can boost sensitivity by very large factors, the superfluid gyroscope may be able to detect some of the strange effects of general relativity predicted by Albert Einstein more than half a century ago, such as gravitomagnetism.
	www.berkeley.edu /news/berkeleyan/1997/0423/turn.html (642 words)

	Earth tide and tilt detection by a ring laser gyroscope
		An Earth tide signal at the lunar tidal period of 12 hours 25 min has been detected in the Sagnac frequency record of the C-II ring laser 30 m underground at Christchurch, New Zealand.
		Its amplitude, one part per million of the Earth rotation signal, is much greater than the value of 40 parts per billion expected.
		Citation: Schreiber, K. Klügel, and G. Stedman (2003), Earth tide and tilt detection by a ring laser gyroscope, J.
	www.agu.org /pubs/crossref/2003/2001JB000569.shtml (216 words)

	Ring Laser Gyroscope Encyclopedia Articles @ LaunchBase.org (Launch Base) (Site not responding. Last check: 2007-09-07)
		Ring Laser Gyroscope Encyclopedia Articles @ LaunchBase.org (Launch Base)
		Find More Information about "Ring laser gyroscope" in LaunchBase.org's:
		"Ring laser gyroscope" results in these other popular encyclopedia sites:
	www.launchbase.org /encyclopedia/Ring_laser_gyroscope (573 words)

	Air Force Technology - Merlin - ASW/Transport Helicopter
		The helicopter is equipped with a Smiths Industries OMI SEP 2 dual redundant digital air flight control system with an Alenia Marconi Systems aircraft management computer.
		The suite of sensors includes: BAE SYSTEMS LINS300 ring laser gyroscope inertial reference unit, LISA-4000 strapdown attitude heading reference system, Thales 91E doppler velocity sensor, Cossor Global Positioning Sensor, two Thales AHV-16 radar altimeters and a BAE SYSTEMS low airspeed sensor and air data system.
		A dual redundant aircraft management computer carries out a range of functions, including navigation, cockpit display management, performance monitoring, health and usage monitoring of engines, drives, avionics, utilities, and control of the 1553 data bus.
	www.airforce-technology.com /projects/merlin (1021 words)

	Laser Gyroscopy
		Technical Resources Directory > Instruments > Laser Gyroscopy
		Results 1 - 6 of 7 found in "Laser Gyroscopy":
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	www.optics.net /directory/index.php?c=140 (41 words)

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