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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Detection of laser-induced nanosecond ultrasonic pulses in metals using a pancake coil and a piezoelectric sensor
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Detection of laser-induced nanosecond ultrasonic pulses in metals using a pancake coil and a piezoelectric sensor

机译：使用薄煎饼线圈和压电传感器检测金属中激光诱导的纳秒超声脉冲

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摘要

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.
机译：压电传感器和煎饼线圈传感器用于宽带检测单晶铝和多晶镍中的激光诱导的超声波。从样品的一侧以5 ns持续时间的激光脉冲诱发具有明显压缩相位的压力脉冲，并从另一侧进行检测。压电方法需要水耦合层，而放置在〜0.25 T的圆柱形磁体偏置永久磁场中的煎饼线圈允许非接触检测。压电换能器检测到的信号呈双极形式，其频谱覆盖5至90 MHz的范围。由薄煎饼线圈在铝中测量的信号分配给涡流源，并且具有单极性。由于反磁致伸缩效应，镍中信号的峰-峰值较高且呈双极形式。煎饼线圈检测到的高频极限接近200 MHz。

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