Tuning fork quartz manometer
US4995263A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Dec 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L21/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The tuning fork quartz manometer has a tuning fork quartz (2) mounted in a protective casing (3) which is in turn part of a self-oscillating feedback circuit. According to the invention the protective casing (3) is inserted by means of a sealing compound (4) or directly into a hosing (5) of a measuring head (1,6) or a mounting support (15a, 20') so that the mounting support can in turn be inserted in the measuring head (1,6) and, as desired, an ideal rigid or elastic suspension is provided. A measuring circuit (20) is located directly in the measuring head close to the tuning gork quartz (2) and is thermally coupled to the latter. The measuring circuit (20) preferably has a temperature correction network (R.sub.1, R.sub.2, 22) high frequency coupled from the feedback circuit containing the tuning fork quartz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.