米6体育平台手机版

SLAA889A March 2019 – July 2021 MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471

Trademarks
1Flow Metering Background
1. 1.1 Water Flow Velocity Estimation
  1. 1.1.1 Velocity of Ultrasound in Water is Known
  2. 1.1.2 Velocity of Ultrasound in Water is Unknown
2Algorithms for Ultrasonic Water Flow Metering
1. 2.1 Correlation Based Technique for Differential TOF Estimation
2. 2.2 Absolute Time-of-Flight (AbsTOF) Measurement (Tup and Tdn)
  1. 2.2.1 AbsTOF Calculation
    1. 2.2.1.1 Acquisition Algorithm for AbsTOF
    2. 2.2.1.2 Tracking Algorithm for AbsTOF
3References
4Revision History

2.2 Absolute Time-of-Flight (AbsTOF) Measurement (T_up and T_dn)

As given in Section 1.1.2, estimating an accurate absolute time of flight in water means that a temperature sensor is not needed to compute the velocity of sound in water. Given that the whole signal waveform is captured using an ADC, there are different algorithms that can be used to calculate the AbsTOF. The following section describes two algorithms, one that is implemented as part of the USS Software Library and one that is planned to be implemented as part of the future releases of the USS Software Library.

2.2 Absolute Time-of-Flight (AbsTOF) Measurement (Tup and Tdn)

2.2 Absolute Time-of-Flight (AbsTOF) Measurement (T_up and T_dn)