Toppan Printing Co., Ltd.

Oxford University Innovation Limited

Andrew Briggs

Takashi Miyamoto

Yusuke Tsukahara

George L Smith

Kyriakos Porfyrakis

Holger Noerenberg

Edward Laird

An oscillation device, such as a frequency standard or 'atomic clock', is disclosed. The device comprises: a system capable of undergoing transitions between different energy states, the transitions defining at least a first resonance frequency and a second resonance frequency; an excitation device arranged to induce the system to undergo such transitions; a detection device arranged to detect a response of the system caused by the excitation device, to produce an output; and a controller arranged to receive the output, to control the excitation device to stimulate said transitions, and to obtain signals corresponding to at least the first and second resonance frequencies; wherein the controller is also arranged to process the obtained signals to produce a corrected output signal that is compensated against at least one influence on the resonance frequencies of the system.

Oscillation device

A method of measuring the rate of transmission of a vapor through a test sample using a mass spectrometer. The test sample is sealed to a gas cell defining a gas chamber, covering an opening in the gas chamber. A droplet of water including isotopes of mass number placed in the gas chamber and the gas cell is introduced into a vacuum chamber adjacent a mass spectrometer. After a sufficient time for evaporation of the liquid to saturate the gas chamber with vapor and for the output of the mass spectrometer to stabilize, the partial pressure of vapor in the vacuum chamber is measured using the mass spectrometer. The measure partial pressure is used to derive the rate of transmission of the vapor through the test sample.

Measurement method of the rate of transmission of a vapor through a sample

Growing community of inventors

Oxford, United Kingdom

Andrew Briggs