Method and apparatus for storing velocity data
US5130937A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1990 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Mar 7, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P2015/0817
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for determining a change in velocity of a body following a power disruptive event. An accelerometer (10, 50) includes quartz crystals (16 and 18, 60 and 62), which produce output signals indicative of the acceleration to which a body connected to the accelerometer is subjected. The acceleration measured is directed along the sensitive axis of the accelerometer. The quartz crystals are selected to have different scale factors, K.sub.1 and K.sub.2, which define the change in frequency of the quartz crystal from its no-load resonant frequency as a force is applied to it. The quartz crystals are connected between a supporting case (14) and a proof mass (12) so that a given acceleration applied to the proof mass along its sensitive axis causes one of the crystals to experience a tension force and the other to experience a compression force. A processor (86) determines the change in velocity of the body as a function of the change in phase of the signals produced by the quartz crystals at a time, t.sub.1, and a subsequent time, t.sub. 2, and further in response to the scale factors, K.sub.1 and K.sub.2. Since the quartz crystals continue to oscillate during a brief…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.