Research on the High Resolution Precision Time-interval Measurement Methods

For single channel sound velocity measurement system accuracy was generally not high,a high-precision dual-channel sound velocity of seawater measurement system was designed.Based on ultrasonic speed of sound measurement in seawater with time-of-flight method,the system used ARM microcontroller to combine with high-precision time interval measurement chip,and the sound velocity measurement was translated into distance and time measurement. Then the influence of the time delay of the system was eliminated by method of difference.The paper introduced the modules of the system,and the high-precision time interval measurement method as the key technology of time-of-flight method for the velocity measurement system was expounded.It wasproved by experiment that the measurement accuracy of the system on the velocity reached 0.019m/s.

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High speed and high precision time-interval measurement system in pulsed laser ranging

Chinese Journal of Liquid Crystals and Displays ◽

10.3788/yjyxs20153001.0083 ◽

2015 ◽

Vol 30 (1) ◽

pp. 83-88 ◽

Cited By ~ 1

Author(s):

岱钦 DAI Qin ◽

毛有明 MAO You-ming ◽

吴凯旋 WU Kai-xuan ◽

吴杰 WU Jie ◽

李业秋 LI Ye-qiu

Keyword(s):

High Precision ◽

Measurement System ◽

High Speed ◽

Pulsed Laser ◽

Laser Ranging ◽

Time Interval ◽

Interval Measurement ◽

Precision Time ◽

Time Interval Measurement

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Ultrasonic Flow Measurement with High Resolution

Metrology and Measurement Systems ◽

10.2478/mms-2014-0026 ◽

2014 ◽

Vol 21 (2) ◽

pp. 305-316 ◽

Cited By ~ 8

Author(s):

Sławomir Grzelak ◽

Jarosław Czoków ◽

Marcin Kowalski ◽

Marek Zieliński

Keyword(s):

High Resolution ◽

Wave Packet ◽

Ultrasonic Transducer ◽

Ultrasonic Pulse ◽

Ultrasonic Flowmeter ◽

Time Interval ◽

Interval Measurement ◽

Characteristic Wave ◽

Time Stamps ◽

Time Interval Measurement

Abstract The ultrasonic flowmeter which is described in this paper, measures the transit of time of an ultrasonic pulse. This device consists of two ultrasonic transducers and a high resolution time interval measurement module. An ultrasonic transducer emits a characteristic wave packet (transmit mode). When the transducer is in receive mode, a characteristic wave packet is formed and it is connected to the time interval measurement module inputs. The time interval measurement module allows registration of transit time differences of a few pulses in the packet. In practice, during a single measuring cycle a few time-stamps are registered. Moreover, the measurement process is also synchronous and, by applying the statistics, the time interval measurement uncertainty improves even in a single measurement. In this article, besides a detailed discussion on the principle of operation of the ultrasonic flowmeter implemented in the FPGA structure, also the test results are presented and discussed

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A High-Precision Time Interval Measurement Method Using Phase-Estimation Algorithm

IEEE Transactions on Instrumentation and Measurement ◽

10.1109/tim.2008.925025 ◽

2008 ◽

Vol 57 (11) ◽

pp. 2670-2676 ◽

Cited By ~ 7

Author(s):

Xiangwei Zhu ◽

Guangfu Sun ◽

Shaowei Yong ◽

Zhaowen Zhuang

Keyword(s):

High Precision ◽

Measurement Method ◽

Estimation Algorithm ◽

Phase Estimation ◽

Time Interval ◽

Interval Measurement ◽

Phase Estimation Algorithm ◽

Precision Time ◽

Time Interval Measurement

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HIGH RESOLUTION TIME-INTERVAL MEASUREMENT SYSTEMS APPLIED TO FLOW MEASUREMENT

Metrology and Measurement Systems ◽

10.2478/mms-2014-0008 ◽

2014 ◽

Vol 21 (1) ◽

pp. 77-84 ◽

Cited By ~ 7

Author(s):

Sławomir Grzelak ◽

Marcin Kowalski ◽

Jarosław Czoków ◽

Marek Zieliński

Keyword(s):

High Resolution ◽

Flow Measurement ◽

Delay Line ◽

Time Interval ◽

Clock Signal ◽

Resolution Time ◽

Interval Measurement ◽

Measurement Systems ◽

Field Programmable ◽

Time Interval Measurement

Abstract The designing process of high resolution time interval measurement systems creates many problems that need to be eliminated. The problems are: the latch error, the nonlinearity conversion, the different duty cycle coefficient of the clock signal, and the clock signal jitter. Factors listed above affect the result of measurement. The FPGA (Field Programmable Gate Array) structure also imposes some restrictions, especially when a tapped delay line is constructed. The article describes the high resolution time-to-digital converter, implemented in a FPGA structure, and the types of errors that appear there. The method of minimization and processing of data to reduce the influence of errors on the measurement is also described.

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