Device for precisely measuring the duration of a time interval

Details Device for precisely measuring the duration of a time interval Device for precisely measuring the duration of a time interval

1997-02-28

1999-06-15

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

368113, G01C 308, G02F 800

Patent

active

059127287

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.

REFERENCES:
patent: 4637733 (1987-01-01), Charles et al.
patent: 4942561 (1990-07-01), Ohishi et al.
patent: 5200933 (1993-04-01), Thornton et al.
patent: 5495494 (1996-02-01), Molva et al.
patent: 5570326 (1996-10-01), Trystram
AR--Proceedings of the IRE, Jan. 1957, pp. 21-30, Baron, R.G., "The Vernier Time-Measuring Technique".

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