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High resolution time interval measurement apparatus and method

A technology of time interval measurement and equipment, 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 the effect of high timing measurement resolution

Active Publication Date: 2012-04-18
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 long time periods with high resolution by using a low frequency counter to measure the "long" portion of the period by accurately measuring the start and stop edges of the actual signal period This is achieved by the time difference between the clock edges of the clock used to measure "long" time periods. The entire measurement process is implemented using relatively low-cost counters, linear ramp generators, and analog-to-digital converters (ADCs) or primarily with microcontrollers.

[0026] This long period time measurement is accomplished by simply activating the counter while the tick period is active. At the end of the tick period, the accumulated value from the counter is obtained.

[0027] This high-resolution measurement technique is achieved by converting time-based measurements to analog-based measurements. This is done using a linear ramp generation circuit gated by a segment pulse generator signal. ...

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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 devices and methods. Background technique [0002] Accurate digital time interval measurement is an essential part of the operation of many electronic sensors or switching devices. The traditional method of converting time into numerical values ​​(ie numbers) is based on counting pulses from a constant frequency clock source. [0003] See attached 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 starts counting, and at time T 2 stop. The time interval T is the time T by dividing the clock cycle clock Multiplied by the number of counts N calculated: [0004] T=T clock ·N [0005] There is a time measurement error associated with this method because the interval starts and stops relative to the clock edges used to count. This includes (T 1 -t 1 ) and (T 2 -t 2 ), an...

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Application Information

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