Sensor and use thereof for measuring speed of sound in gaseous medium and method and apparatus for measurement of vapour sorption
US10983094B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2017 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Jul 12, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring the transit time of an ultrasonic wave in a medium, by passing an ultrasonic wave pulse through a timing path in the medium, receiving the ultrasonic wave pulse at the exit of the timing path and comparing a first signal representative of the ultrasonic wave pulse on entry to the timing path with a second signal representative of the ultrasonic wave pulse received at the exit of the timing path. At least one cycle and associated zero-crossing point of the first signal is correlated with a corresponding cycle and zero-crossing point of the second signal, and the time interval is measured between the zero crossing points, in order to determine the transit time of the ultrasonic wave through the medium. The method is useful in a sensor for measuring gas composition, as well as bulk gas flow velocity. The sensor and method may be used in a dual channel apparatus for investigating vapour sorption by a substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.