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Measurement of ultrasonic pulse velocity with improved accuracy using automatic threshold error correction.

Piyush1,2, Nitin Dhiman1,2, Bishan Kumar1,2

  • 1Pressure Vacuum and Ultrasonic Metrology, CSIR National Physical Laboratory, Dr. K S Krishnan Marg, New Delhi 110012, India.

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This study introduces a new circuit to improve Ultrasonic Pulse Velocity (UPV) measurements for concrete health monitoring. The developed system significantly reduces errors caused by threshold detection, enhancing accuracy in structural assessments.

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Non-Destructive Testing

Background:

  • Ultrasonic Pulse Velocity (UPV) is crucial for assessing concrete strength and structural integrity.
  • Current UPV systems using single threshold detection are susceptible to threshold errors, impacting measurement accuracy.
  • Errors up to 10% in ultrasonic transit time can occur with standard 50 kHz UPV testers.

Purpose of the Study:

  • To develop and describe an improved UPV measurement circuit.
  • To detect and compensate for threshold errors in UPV measurements.
  • To enhance the accuracy and reliability of concrete health monitoring.

Main Methods:

  • Implementation of a novel UPV measurement circuit.
  • Utilizing two threshold comparators and two hybrid counters for error correction.
  • Testing the developed circuit's performance across a range of receiver gains.

Main Results:

  • The developed circuit effectively detects and compensates for threshold errors.
  • Minimized threshold error across a wide range of receiver gains.
  • Achieved significant improvement in measurement accuracy, with deviations within 100 ns.

Conclusions:

  • The new circuit offers a substantial improvement over existing UPV measurement systems.
  • Accurate concrete health monitoring is enhanced through threshold error compensation.
  • The developed system provides more reliable data for structural health assessment.