A device for precisely measuring the duration of a time...

G - Physics – 04 – F

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G04F 10/04 (2006.01) G04F 10/10 (2006.01) H03K 5/26 (2006.01)

Patent

CA 2197399

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.

Dispositif pour mesurer la durée d'un intervalle entre un signal de début (D) et un signal de fin (F) comprenant : - une horloge (H) produisant des impulsions avec une période T, - un circuit numérique (2, 3, 4) pour effectuer une mesure brute du nombre d'impulsions d'horloge entre D et F, - un circuit analogique (6, 8, 10, 12, 14) pour effectuer une mesure fine du temps entre D (ou F) et la première (ou la dernière dans le cas de F) impulsion d'horloge qui commence après D (ou avant F), ce circuit comprenant : - des moyens (8, 10) de produire N rampes avec la même orientation, - des moyens d'échantillonner au moins une des rampes aux moments où D et F se produisent. Application à un appareil de télémesure à microlaser.

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