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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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Related Experiment Video

Updated: Jun 25, 2025

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Inverse stimulation enables ultrasonic binary coding for NDE using a custom linear testing system.

Marius W Schäfer1, Sarah C L Fischer1

  • 1Fraunhofer IZFP, Campus E3.1, Saarbruecken, 66123, Saarland, Germany.

Ultrasonics
|May 26, 2024
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Summary
This summary is machine-generated.

This study introduces inverse stimulation for ultrasonic testing, enabling precise control over ultrasonic echoes. This method achieves binary ultrasonic echo generation with performance matching digital codes, enhancing non-destructive evaluation capabilities.

Keywords:
Binary codingCoded excitationInverse stimulationLinear system modelUltrasound

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Area of Science:

  • Materials Science
  • Non-Destructive Evaluation
  • Signal Processing

Background:

  • Conventional ultrasonic testing methods face limitations with complex materials.
  • Techniques like coded stimulation in radar and medical ultrasound offer potential for optimization.
  • Extending ultrasonic testing capabilities requires advanced signal processing strategies.

Purpose of the Study:

  • To explore inverse stimulation for ultrasonic testing systems.
  • To engineer ultrasonic echoes to match target code sequences.
  • To demonstrate a novel approach for enhancing ultrasonic non-destructive evaluation.

Main Methods:

  • Designed and built a custom ultrasonic testing system.
  • Obtained the system's transfer function using pulse and chirp stimulation.
  • Performed inverse stimulation based on the transfer function to shape ultrasonic echoes.
  • Analyzed the auto-correlation function of generated echoes and compared them to the original code sequence.

Main Results:

  • Successfully engineered ultrasonic echoes to match target binary code sequences.
  • Demonstrated that inverse stimulation can generate binary ultrasonic echoes with performance equivalent to digital codes.
  • Validated the effectiveness of the custom-built ultrasonic system for echo engineering.

Conclusions:

  • Inverse stimulation is a viable technique for advanced ultrasonic testing.
  • The proposed integrated, low-voltage system enables echo engineering via transfer function analysis.
  • This approach significantly enhances the capabilities and applications of ultrasonic non-destructive evaluation.