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首页> 外文期刊>Journal of the Optical Society of America, A. Optics, image science, and vision >Pulsed ultrasound modulated optical tomography with harmonic lock-in holography detection
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Pulsed ultrasound modulated optical tomography with harmonic lock-in holography detection

机译：具有谐波锁定全息检测功能的脉冲超声调制光学层析成像

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摘要

A method that uses digital heterodyne holography reconstruction to extract scattered light modulated by a single-cycle ultrasound (US) burst is demonstrated and analyzed. An US burst is used to shift the pulsed laser frequency by a series of discrete harmonic frequencies which are then locked on a CCD. The analysis demonstrates that the unmodulated light's contribution to the detected signal can be canceled by appropriate selection of the pulse repetition frequency. It is also shown that the modulated signal can be maximized by selecting a pulse sequence which consists of a pulse followed by its inverted counterpart. The system is used to image a 12 mm thick chicken breast with 2 mm wide optically absorbing objects embedded at the midplane. Furthermore, the method can be revised to detect the nonlinear US modulated signal by locking at the second harmonic US frequency.
机译：演示和分析了一种方法，该方法使用数字外差全息术重建以提取由单周期超声（US）突发调制的散射光。使用US脉冲串将脉冲激光频率偏移一系列离散的谐波频率，然后将其锁定在CCD上。分析表明，可以通过适当选择脉冲重复频率来消除未调制光对检测信号的影响。还表明，可以通过选择一个脉冲序列来使调制信号最大化，该脉冲序列由一个脉冲和随后的反向对应脉冲组成。该系统用于对12毫米厚的鸡胸进行成像，在中平面嵌入2毫米宽的光学吸收物体。此外，可以将方法修改为通过锁定在二次谐波US频率来检测非线性US调制信号。

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