Time measuring apparatus
US4772843A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | May 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F10/105
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In order to accurately measure time interval Tx from time t.sub.j to time t.sub.k, the pulse widths of a start interpolation pulse and a stop interpolation pulse must be measured accurately. The invention uses two time-to-voltage converters, one for the start interpolation pulse and the other for the stop interpolation pulse, to convert these pulses to corresponding voltage signals to thereby measure the pulse widths. These converters each comprises a high speed circuit which comprises a current switch, a capacitor, a constant current source and a diode. Advantageously, even though the start and stop interpolation pulses occur close to each other, the pulses can be measured accurately. Also, even though the pulses occur at short intervals, the time interval Tx can be measured accurately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.