Height difference measurement in PTB’s liquid column manometer |
|---|
| Sven Ehlers |
- Abstract:
- A primary liquid column manometer (LCM) is under development at PTB for use in conducting low-pressure measurements up to 2 kPa in gauge and absolute pressure. To calculate pressure, all measured input quantities of the instrument, as there are liquid density, gravitational acceleration, and length, are traceable to the International System of Units (SI), thus making the LCM a primary pressure standard. The LCM is well suited to identifying small force-induced errors, particularly those of force-compensated pressure balances with non-rotating piston in their lower measurement range, and as such to disseminating the pascal, the SI unit of pressure.
This report focuses on the measurement of the height difference inside the instrument, where homodyne plane mirror interferometry is applied using the liquid’s free surface as the reflecting mirror for the laser beam. - Download:
- IMEKO-TC16-2023-12.pdf
- DOI:
- 10.21014/tc16-2023.12
- Event details
- IMEKO TC:
- TC16
- Event name:
- TC16 Conference 2023
- Title:
7th Conference on Pressure and Vacuum Measurement (together with the CCM - the Consultative Committee for Mass and Related Quantities of the BIPM)
- Place:
- Washington DC, UNITED STATES
- Time:
- 15 May 2023 - 19 May 2023