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Topic: Atomic clock

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In the News (Tue 22 Jan 19)

  NIST Unveils Chip-Scale Atomic Clock
Atomic clocks long have provided the most accurate realizations of both of these quantities but also have traditionally been large—up to two meters in height—as well as power-hungry and expensive to build.
The new clock is based on the same general idea as other atomic clocks such as the NIST-F1 fountain clock—measuring time by the natural vibrations of cesium atoms, at 9.2 billion “ticks” per second—but uses a different design.
The "physics package" of the chip-scale atomic clock includes (from the bottom) a laser, a lens, an optical attenuator to reduce the laser power, a waveplate that changes the polarization of the light, a cell containing a vapor of cesium atoms, and (on top) a photodiode to detect the laser light transmitted through the cell.
www.nist.gov /public_affairs/releases/miniclock.htm   (800 words)

 Atomic clock to sync handhelds TRN 100604
The chip-scale atomic clock consumes 73 thousandths of a watt, which is comparable to common quartz crystal oscillators.
The researchers are working on making the clock accurate to one microsecond per day, or one second in 3,171 years, dropping its power consumption to 30 milliwatts, and putting it in a package that, including an oscillator and control electronics, would measure one cubic centimeter, said Hollberg.
"Compared to the smallest commercial atomic clocks this would be a volume reduction by a factor of about 50 times, and a reduction in power consumption by about 100 times," he said.
www.trnmag.com /Stories/2004/100604/Atomic_clock_to_sync_handhelds_100604.html   (644 words)

  Atomic clock
The most accurate atomic clocks are moderated by precise astronomical measurements and the insertion and removal of leap seconds at the very end of June and December.
The first atomic clock was built in 1949 at the U.S. National Bureau of Standards.
U.S. Broadcasts: The U.S.'s NIST clocks are also available on longwave radio, station WWVB at 60KHz (binary coded decimal only) at 30,000W, and by shortwave radio stations WWV (Fort Collins, Colorado) and WWVH (Kekaha, Hawaii, on Kauai) at 2.5, 5, 10 and 15 Mhz at 20,000W and 10,000W respectively.
www.ebroadcast.com.au /lookup/encyclopedia/at/Atomic_clock.html   (911 words)

  Atomic clock Summary
For example, atomic clocks are often used in navigation systems: the distance and position of a vessel can be precisely defined by measuring the difference between the time it takes for two signals to reach it; this difference is usually very small, and so a very accurate timing device is essential.
The first accurate atomic clock, based on the transition of the caesium-133 atom, was built by Louis Essen in 1955 at the National Physical Laboratory in the UK.
The core of the atomic clock is a microwave cavity containing the ionized gas, a tunable microwave radio oscillator, and a feedback loop which is used to adjust the oscillator to the exact frequency of the absorption characteristic defined by the behavior of the individual atoms.
www.bookrags.com /Atomic_clock   (1973 words)

 What is atomic clock? - a definition from Whatis.com - see also: NIST-F1
An atomic clock is the most accurate type of timepiece in the world, designed to measure time according to vibrations within atoms.
Atomic clocks are used to coordinate systems that require extreme precision, such as Global Positioning System (GPS) navigation and the Internet.
Like a regular clock, an atomic clock keeps time according to oscillation, which is a periodic variation or movement between two entities or between two states of a single entity, created by changes in energy.
whatis.techtarget.com /definition/0,,sid9_gci1021158,00.html?track=NL-34&ad=496484   (505 words)

 Atomic Clocks   (Site not responding. Last check: )
Such clocks have provided the accuracy necessary to test general relativity and to track variations in the frequencies of pulsars.
Atomic clocks are integral parts of the Global Positioning System since extreme accuracy in timing is necessary for the triangulation involved.
The frequency of this atomic clock is in the microwave region of the electromagnetic spectrum and is a convenient one for locking a microwave oscillator.
hyperphysics.phy-astr.gsu.edu /hbase/acloc.html   (296 words)

 Atomic Clock Information
Without the atomic clock, GPS navigation would be impossible, the Internet would not synchronise, and the position of the planets would not be known with enough accuracy for space probes and landers to be launched and monitored.
The big difference between a standard clock in your home and an atomic clock is that the oscillation in an atomic clock is between the nucleus of an atom and the surrounding electrons.
The Rubidium atomic clock, the simplest and most compact of all, use a glass cell of rubidium gas that changes its absorption of light at the optical rubidium frequency when the surrounding microwave frequency is just right.
www.atomic-clock.galleon.eu.com /atomic-clock/atomic-clock.htm   (3506 words)

 CNN.com - Atomic clock gets mini-makeover - Oct 20, 2004
By contrast, the atomic clock would be accurate to within a second every 300 years, making it more than 1,000 times more reliable than a very good wristwatch.
Atomic clocks can be several meters tall, expensive to build and power-hungry, making them extremely impractical for commercial use.
Atomic clocks work by measuring the frequency of cesium atoms, which vibrate almost 9.2 billion times a second.
www.cnn.com /2004/TECH/10/14/atomic.clock/index.html   (680 words)

 Atomic Clocks
Atomic Clocks set themselves by listening for the radio signals of the NIST Atomic Clock in Fort Collins, Colorado.
As soon as the Atomic Clock caches the signal, the hands will spin at 20 times their normal rate and the time is adjusted to accuracy with less than a one-second deviation in one million years!
These clocks receive a radio signal from the most accurate clock in the world, the cesium atomic clock, transmitted from the National Institute of Standards in Fort Collins, CO. You’ll never have to reset the clock, even for daylight-savings time.
www.theclockdepot.com /atomic_clocks.html   (757 words)

 BBC NEWS | Science/Nature | Atomic ticker clocks up 50 years
Atomic clocks are still much more constant than any other current method of time-keeping, although they are sensitive in a very small way to changes in electric and magnetic fields.
Atomic time is crucial for a plethora of telecommunications and computing applications, such as coordinating packets of data which are transferred across the net, global positioning satellite (GPS) systems and mobile telephony.
As optical atomic clocks develop, however, they may start to appear in ground stations, then in future generations of satellite systems, which then means sub-metre precision location, even when an object or person is on the move.
news.bbc.co.uk /1/hi/sci/tech/4587919.stm   (1088 words)

 Mercury Atomic Clock Keeps Time With Record Accuracy
The improved version of the mercury clock is the most accurate to date of any atomic clock, including a variety of experimental optical clocks using different atoms and designs.
Clock Comparison Yields Clues To 'Constant' Change (Feb. 18, 2007) —; Years of comparisons among the world's best atomic clocks -- based on different atoms -- have established the most precise limits ever achieved in the laboratory for detecting possible changes in...
Strontium Atomic Clock Demonstrates Super-fine 'Ticks' (Dec. 1, 2006) — Using an ultra-stable laser to manipulate strontium atoms trapped in a "lattice" made of light, scientists at JILA (a joint institute of NIST and the University of Colorado at Boulder) have...
www.sciencedaily.com /releases/2006/07/060715104136.htm   (965 words)

 Galleon Atomic Clock Time Synchronisation
Atomic Clock Time Synchronisation for, computers, computer networks; CCTV (Close Circuit Television) security surveillance, heating systems and time registration equipment, is supplied by Galleon Systems.
Atomic Clocks enable a computer to operate using time accurate to one second in 1,000,000 years, with automatic correction for summer/winter time.
Atomic Clocks are the most accurate clocks in the world and are used by government bodies to define the absolute time.
www.galleon.eu.com /atomic-clock.htm   (383 words)

 Atomic Clock Synch, Atomic Clock Synchronization, Atomic Digital Clocks, Atomic Radio Controlled Clock, How An Atomic ...
Atomic digital clocks works great, as is evident by the hundreds of thousands of units that have been sold throughout the United States.
However if a problem with atomic clock synchronization is suspected, the clock should first be checked by using the NIST atomic clock on the internet or by listening to NIST radio station WWV using a shortwave radio or telephone (dial 303-499-7111).
Not all atomic digital clocks have this feature and another time zone may have to be selected in order to make the clock display the correct time when DST is in effect.
www.weathershack.com /education/atomic-clock-synch.html   (831 words)

 NIST unveils smallest atomic clock (September 2004) - News - PhysicsWeb
The precision of atomic clocks could soon be available in handheld devices such as cell phones, radios and GPS receivers thanks to a breakthrough at the US National Institute of Standards and Technology (NIST) in Boulder, Colorado.
For more than 50 years, atomic clocks have set the gold standard for time and frequency measurement but their applications have been limited by their complexity, size and expense.
The clock is stable to one part in 10 billion, equivalent to 1 second in 300 years -- a long-term stability which is several orders of magnitude better than competing portable units such as temperature-compensated quartz crystal oscillators.
physicsweb.org /articles/news/8/9/2/1   (410 words)

 Atomic Clock Synchronization using the WWVB time signal from Colorado
Accurate time using Atomic Clock accuracy is available across North America using the WWVB Atomic Clock time signal transmitted from Colorado, it provides the ability to synchronize the time on computers and other electrical equipment.
Atomic clocks achieve accurate time because they are controlled by radio transmitters which themselves receive their time signals from amazingly accurate timepieces, Cesium Atomic Clocks.
In operation, the clocks are based upon the characteristics of the Cesium 133 atom, whose single electron is known to vibrate at a standard 9,192,631,770 times a second.
www.ntp-time-server.com /atomic-clock.htm   (1132 words)

 Atomic Clock Sync Information from worldtimeserver.com
Atomic clock servers are operated by many governments and some large organizations.
These atomic clock servers can be contacted to synchronize a local time with the server's time.
There are many programs to perform an atomic clock sync available for older operating systems which do not have synchronation built in.
www.worldtimeserver.com /atomic-clock   (775 words)

 Atomic Clock w/Thermometer - WT-3181P
Just insert the battery, select a time zone with a press of a button, and the clock's hands will move into place by themselves when it receives the nightly radio signals regulated by the U.S. Atomic Clock in Colorado.
The clock even self-adjusts for Daylight Saving Time within 5 days, although this feature can be disabled if you live in an area that doesn't change clock settings twice a year.
The Atomic Clock w/Thermometer has two analog sensors that measure the surrounding temperature and humidity.
www.smarthome.com /19415.html   (242 words)

The government owns and operates an "atomic clock" that is located in Colorado.
The clock is hooked up to a huge radio antenna which sends out a strong signal across the US.
These clocks tune into that radio signal's frequency, decode the signal, and untimely set its time to the US atomic clock.
www.atomicclocksale.com /faq.html   (2010 words)

 "Atomic" Clock
In many contemporary clocks, it is an oscillating crystal of quartz that keeps the beat of passing time in a precise and periodic way.
The first atomic clock was built using microwave resonance in ammonia molecules for the frequency standard.
The atomic clocks we've been talking about may be the most accurate timekeepers on the planet, but they aren't very useful unless their information (time signals) are widely communicated.
www.4physics.com /phy_demo/at_clock/at_clock.htm   (1626 words)

 Atomic Watches USA | FAQ
All watches receive a radio signal from the Caesium atomic, the world's most precise clock, accurate to 1 second in 1 million years.
The signal originates from the WWVB transmitter in Fort Collins, Colorado and is transmitted on a frequency of 60 kHz.
No, the atomic Junghans watches are equipped with an exclusive world wide patented system which remembers the 12 o'clock position of the watch.
www.atomicwatchesusa.com /About_Atomic_Watches.htm   (1857 words)

 Attache Transparent Atomic Clock with fully customizable shape, alarms, and atomic clock time
Attache Clock may be used as an alarm-clock/reminder, to help you stop forgetting your friends' birthdays and other important but not so easy to memorize events.
The clock face can also be attached to a window so that when you move or resize the window, the clock automatically moves to a specified position.
You can synchronize your computer's system clock with highest precision atomic clock servers, customize the process of automatic system time adjustment and find the clock servers are most easily accessible from your segment of the Internet.
www.softdemon.com /clock   (457 words)

 First Atomic Clock Wristwatch
The many "atomic time" wristwatches you see on the market today are merely cheap quartz wristwatches with a built-in radio receiver.
The definition of a wrist watch is a time piece that can be worn on the wrist, no? Below is my brother-in-law, Bill, a professional construction contractor, proving that a HP 5071A Cesium Beam Primary Frequency Reference can in fact be used as a wrist watch.
There are no adjustments for daylight saving time; however the clock does handle leap seconds and keeps track of the [Modified Julian] date.
www.leapsecond.com /pages/atomic-bill   (310 words)

 NIST-F1 - Cesium Fountain Atomic Clock
NIST-F1, the nation's primary time and frequency standard, is a cesium fountain atomic clock developed at the NIST laboratories in Boulder, Colorado.
During the trip, the atomic states of the atoms might or might not be altered as they interact with the microwave signal.
Those atoms whose atomic state were altered by the microwave signal emit light (a state known as fluorescence).
tf.nist.gov /cesium/fountain.htm   (683 words)

 The "Atomic Age" of Time Standards
The first practical cesium atomic frequency standard was built at the National Physical Laboratory in England in 1955, and in collaboration with the U.S. Naval Observatory (USNO), the frequency of the cesium reference was established or measured relative to astronomical time.
Called NIST-F1, it is the 8th of a series of cesium clocks built by NIST and NIST's first to operate on the "fountain" principle.
Other kinds of atomic clocks have also been developed for various applications; those based on hydrogen offer exceptional stability, for example, and those based on microwave absorption in rubidium vapor are more compact, lower in cost, and require less power.
physics.nist.gov /GenInt/Time/atomic.html   (560 words)

 SPACE.com -- Why the World Runs Like Clockwork
The hodge-podge aesthetics betray this chronometer's significance: The F-1 Cesium Fountain Atomic Clock, in partnership with another much like it in Paris, synchronize all the clocks of the world by defining the length of a second as accurately as possible to keep the modern world running like, well, clockwork.
The astronomer whose clock can most accurately measure the time a signal was sent, and the time it was received, will best know where that instrument is in space.
The clock's purpose is to measure the length of a second as it is internationally defined: the moment that passes while a cesium atom oscillates between its two lowest levels of excitement 9,192,631,770 times.
www.space.com /scienceastronomy/generalscience/time_scitues_020430-1.html   (835 words)

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