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https://www.nist.gov/pml
Physical Measurement Laboratory
PML is a world leader in the science of measurement. We determine the definitive methods for nearly every kind of measurement employed in commerce and research, provide NIST-traceable calibrations, and disseminate standards and best practices throughout the nation. At the same time, PML works continuously at the outermost frontiers of metrology, devising tools and techniques to meet the ever-changing demands of American industry and science.
Microcombs – chip-scale devices that generate and measure frequencies of light with exquisite accuracy – have transformed timekeeping and boosted optical
The theme for the 2024 World Metrology Day (on May 20) is "Sustainability," which raises awareness of the need for accurate measurements in the development of a
OWM's National Legal Metrology Program (NLMP) is pleased to launch a new series of Weights and Measures Information Hours. Each "Info Hour" session (1-hour
By modifying a refrigerator commonly used in both research and industry, researchers at the National Institute of Standards and Technology (NIST) in the US have
A simple modification to a popular type of cryogenic cooler could save $30 million in global electricity consumption and enough cooling water to fill 5000
In a proof-of-concept study, researchers at the National Institute of Standards and Technology (NIST) used a smartphone’s built-in magnetometer, combined with
A method of designing a continuous-wave laser source having a target output wavelength and an input laser with a wavelength different from the target output wavelength includes the steps of receiving the target output wavelength, and subordinate properties of the laser source; determining a
A hyperpolarization micro-magnetic resonance imager for three-dimensional imaging of a biological composition with cellular resolution includes a hyperpolarizer source, hyperpolarizer transmission line, an NMR console, a nuclear magnetic resonance tuned circuit, an imaging cell, a magnet, a gradient
Richard A. Allen
,
Randall P Wagner
,
Benjamin Reschovsky
and
Akobuije Chijioke
A sound pressure metrology instrument determines sound pressure from index of refraction and includes: a light source that produces source light; the optical cavity that: receives an acoustic field from the sound source; receives the source light from the light source; produces acoustic-modified
Paul Patrone
,
Gregory A Cooksey
and
Matthew DiSalvo
A spatio-temporal profilometer performs time-resolved spatial profilometry and includes a substrate, a tapered optical collimator waveguide, a fluid channel, and a light-fluid interaction volume. The tapered optical collimator waveguide receives diverging light, internally reflects it, and