Device for precisely measuring the duration of a time interval
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United States of America Patent
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Jun 15, 1999
Grant Date -
N/A
app pub date -
Feb 28, 1997
filing date -
Mar 1, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a device for measuring the duration of a time interval between a start signal (D) and an end signal (F) comprising: a clock (H) supplying pulses with a period T, a digital circuit (2, 3, 4) to carry out a coarse measurement of the number of clock pulses between D and F, an analog circuit (6, 8, 10, 12, 14) to carry out a fine measurement of the time respectively between D and the first (respectively between F and the last) clock pulse which begins after D (respectively before F), this circuit comprising: means (8, 10) of generating N ramps with the same direction, means of sampling at least one the ramps at the instants that D and F occur. Application to a microlaser telemeter.
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