national metrology institutes

Software for equalizing ultrasound signals – PTB.de

March 8, 2022 Office

PTBnews 1.2022 – With its interactive software that can be used to correct measured ultrasound signals, PTB is intending to make its signal deconvolution procedure available to a larger group of users and thus to […]

JILA Atomic Clocks Measure Einstein’s General Relativity at Millimeter Scale | NIST News

February 16, 2022 Office

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 […]

New record for comparison of distant ultrastable lasers | NPL News

January 11, 2022 Office

Using cutting-edge optical frequency standards developed at PTB and NPL, the team has been able to demonstrate that their measurement precision is preserved even when transmitted across thousands of kilometers of optical fibre. Source: New […]

Diode lasers for optical metrology | PTB.de

November 4, 2021 Office

PTBnews 03.2021 — In collaboration with an industrial partner, PTB has developed and assessed a very compact wavelength standard. This standard is based on a diode laser whose frequency is stabilized to transitions of the […]

On the path to a “nanometer standard” | PTB.de

November 4, 2021 Office

PTBnews 3.2021 — At PTB, absolute length measurements on a single-crystal silicon gauge block have been performed using imaging interferometry. These measurements have a smaller measurement uncertainty than all previous measurements. They provide more accurate […]

Software for equalizing ultrasound signals – PTB.de

JILA Atomic Clocks Measure Einstein’s General Relativity at Millimeter Scale | NIST News

New record for comparison of distant ultrastable lasers | NPL News

Diode lasers for optical metrology | PTB.de

On the path to a “nanometer standard” | PTB.de

Testing 1-2: New Laser-Based Microphone Calibration Measures Up | NIST

NIST-Led Study Finds Variations in Quantitative MRI Scanners’ Measurements | NIST

Escape From Flatland: Calibration Method Enables Microscopes to Make Accurate Measurements in All 3 Dimensions | NIST