Detection of laser-induced nanosecond ultrasonic pulses in metals using a pancake coil and a piezoelectric sensor
| Autor: | H. Krenn, V. V. Kozhushko |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Acoustics and Ultrasonics business.industry Piezoelectric sensor Biasing Laser Signal Piezoelectricity law.invention Nuclear magnetic resonance Electromagnetic coil law Optoelectronics Ultrasonic sensor Electrical and Electronic Engineering Inverse magnetostrictive effect business Instrumentation |
| Zdroj: | IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 59:1233-1238 |
| ISSN: | 0885-3010 |
| DOI: | 10.1109/tuffc.2012.2313 |
| Popis: | A piezoelectric sensor and a pancake coil sensor were used for broadband detection of laser-induced ultrasound in single-crystal aluminum and polycrystalline nickel. Pressure pulses with pronounced compression phases were induced by laser pulses of 5 ns duration from one side of the specimens and detected from the opposite side. A coupling layer of water was required for the piezoelectric method, whereas the pancake coil placed in the biasing permanent field of a cylindrical magnet ~0.25 T allowed noncontact detection. The signals detected by a piezoelectric transducer showed bipolar form and their spectra covered the range from 5 to 90 MHz. The signal measured in aluminum by a pancake coil was assigned to the eddy current sources and had single polarity. The peak-to-peak value of the signal in nickel was higher and had bipolar form because of the inverse magnetostrictive effect. The high-frequency limit detected by the pancake coil approached 200 MHz. |
| Databáze: | OpenAIRE |
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