UT Pulse-Echo Calculation

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UT Pulse-Echo Calculation

Ultrasonic Pulse-Echo Calculator

Select calculation type, enter values, and click calculate.
Example: For steel (5900 m/s), a 20 μs pulse-echo time gives a distance of 59 mm (59000 μm). A 10 mm distance gives a round-trip time of 3.39 μs.

Example of Pulse-Echo Calculation:
The pulse-echo method measures the distance to a reflector or material thickness by analyzing the time delay between a transmitted pulse and its received echo. The formula for distance is:

Distance (d) = (Pulse-Echo Time (t) × Velocity of Sound (c)) / 2

Scenario:
An ultrasonic pulse travels through aluminum, where the speed of sound is 6400 m/s. The reflector is 25 mm away. Calculate the time of flight (TOF) and the total round-trip time for the pulse.

Step 1: Calculate Time of Flight (TOF)
First, convert the distance to meters:
25 mm = 0.025 m

Use the formula:
TOF = Distance (d) / Velocity of Sound (c)
TOF = 0.025 m / 6400 m/s = 0.0000039 seconds (3.9 μs)

Step 2: Calculate Total Round-Trip Time
The round-trip time is twice the TOF:
Total Round-Trip Time = 2 × TOF = 2 × 3.9 μs = 7.8 μs

Conclusion:
For a reflector 25 mm away in aluminum, the ultrasonic pulse takes 3.9 microseconds to reach the reflector and 7.8 microseconds to complete the round trip.

Key Notes:

  • Ensure unit consistency (e.g., convert mm to meters for calculations).
  • The division by 2 in the distance formula accounts for the pulse traveling to the reflector and back.

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