Ultrasonic Pulse Velocity Tester Device with Threshold Error Correction

Ultrasonic pulse velocity (UPV) is an extremely useful parameter to investigate the mechanical properties of bulk materials such as metals, composites and concrete structures. By measuring the ultrasonic transit time through the material other related properties can be evaluated. Recently CSIR-NPL has developed a unique UPV tester with automatic threshold error correction facility for more accurate transit time measurement. The device is battery operated and is suitable for site operations. Any generalized commercially available transducers of suitable frequency can be used.

Ultrasonic transit time measurement in metallic, non-metallic, concrete, or any material supporting ultrasonic propagation, Ultrasonic velocity measurement, Estimation of concrete strength, Homogeneity and quality estimation of concrete materials, Estimation of dynamic modulus of elasticity in concretes.

• Automatic threshold error correction 
• Transit time measurement range: 0 to 50 ms
•  High measurement resolution: 0.05 μs
•  Automatic PRR 
• Selectable gain: 20 dB to 60 dB

1. MOSFET based capacitor discharge to deliver high power.

2. The provision of providing automatic threshold error correction results in ultrasonic transit time (delay) measurement relatively accurate.

3. The transit time measurement involving difference in the threshold corrected zero offset and threshold corrected material time delay ultimately minimizes the error in the actual transit time measurement. 

4. Highly sensitive envelop detector for small signal amplitude detection.

5. Ability to detect wrong pulses and hence minimizes wrong measurement.