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High resolution time interval measurement apparatus and method

A technology of time interval measurement and time interval, which is applied in the direction of electrical unknown time interval measurement, device for measuring time interval, phase measurement with measurement, etc., can solve the problems of high cost and high power consumption, and achieve high timing measurement resolution Effect

Active Publication Date: 2007-04-04
AMETEK INC
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Problems solved by technology

These circuits have inherent drawbacks including high cost, high power consumption (i.e. not beneficial for battery powered devices), and prone to emitting EMC noise

Method used

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  • High resolution time interval measurement apparatus and method
  • High resolution time interval measurement apparatus and method
  • High resolution time interval measurement apparatus and method

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Embodiment Construction

[0025] The apparatus and method of the present invention measure the long-term period with high resolution by using a low frequency counter to measure the "long" part of the long-term period, and the "high resolution" is by accurately measuring the start and stop edges of the actual signal period This is achieved by the time difference between the clock edge of the clock used to measure the "long" time period. The entire measurement process is achieved by using relatively low-cost counters, linear ramp generators, and analog-to-digital converters (ADCs) or mainly by microcontrollers.

[0026] This long period time measurement is done by simply activating the counter when the timing period is valid. At the end of the timing period, the accumulated value from the counter is obtained.

[0027] This high-resolution measurement technique is achieved by converting time-based measurements into analog-based measurements. This is done by using a linear ramp generator circuit gated by the s...

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Abstract

A time interval measurement apparatus and method counts the total number of full clock time periods between two measurement signals. Clock fractional time periods are generated between each of the two measurement signals and the next leading edge of a full clock time period. The total number of full clock time periods and the clock fractional time periods are converted to a time equivalent measurement and combined to generate the total time interval between the two measurement signals.

Description

Technical field [0001] The present invention generally relates to time interval measurement equipment and methods. Background technique [0002] Accurate digital time interval measurement is an important part of the operation of many electronic sensors or conversion devices. The traditional method of converting time into a value (ie, number) is based on counting pulses from a constant frequency clock source. [0003] Refer to Figure 1, if the measured time interval is from time t 1 To time t 2 , Then the total duration is t=t 2 -t 1 . Clock at time T 1 Start counting, and at time T 2 stop. The time interval T is obtained by dividing the clock cycle time T clock Calculated by multiplying by the number of counts N: [0004] T=T clock ·N [0005] There are time measurement errors associated with this method because the interval has start and stop signals relative to the edge of the clock used to count. This includes (T 1 -t 1 ) And (T 2 -t 2 ), and these diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04F10/04
CPCG04F10/06G04F10/04
Inventor 杰克·帕蒂
Owner AMETEK INC
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