December 1, 2025 Ask someone on Earth for the time and they can give you an exact answer, thanks to our planet’s intricate timekeeping system, built with atomic clocks, GPS satellites and high-speed telecommunications networks. […]
December 23, 2024 For more than three decades, the National Institute of Standards and Technology (NIST) has calibrated the wavelengths of lasers used in industry, academia, and government laboratories. NIST has now expanded its service […]
An improvement to a Nobel Prize-winning technology called a frequency comb enables it to measure light pulse arrival times with greater sensitivity than was previously possible — potentially improving measurements of distance along with applications […]
by Nadya Goldovsky Measurement uncertainty for a GPS receiver depends on the receiver’s design and on the measurement method used. The majority of clients’ GPS receivers operate with C/A code and use the one-way method […]
JILA physicists have measured Albert Einstein’s theory of general relativity, or more specifically, the effect called time dilation, at the smallest scale ever, showing that two tiny atomic clocks, separated by just a millimeter or […]
In a significant advance toward the future redefinition of the international unit of time, the second, a research team led by the National Institute of Standards and Technology (NIST) has compared three of the world’s […]
by Michael Lombardi Volume 3:2, Mar-Apr 1996 This article is part II of a two-part series on frequency calibrations. Part I introduced the topic of frequency calibrations, discussed the specifications involved, and described several types […]
by Michael Lombardi Volume 3:1, Jan-Feb 1996 This article is part I of a two-part series on frequency calibrations. Part I introduces the topic of frequency calibrations, discusses the specifications involved, and describes the different […]
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