Sun Zuwen, Baddour Natalie, Mandelis Andreas
Department of Mechanical Engineering, University of Ottawa, 161 Louis Pasteur, K1N 6N5, Ottawa, Canada.
Center for Advanced Diffusion-Wave and Photoacoustic Technologies (CADIPT), Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, M5S 3G8, Toronto, Canada.
Photoacoustics. 2019 May 2;14:49-66. doi: 10.1016/j.pacs.2019.04.003. eCollection 2019 Jun.
Recent developments in photoacoustics have witnessed the implementation of a radar matched-filtering methodology into the continuous wave photoacoustic modality. The main merit of using matched filtering in continuous photoacoustics is the improvement in signal to noise ratio (SNR), but the correlation process may result in a loss of resolution. It is possible to enhance both SNR and resolution by matched-filtering and pulse compression with a frequency chirp. However, the theory behind the effect of the chirp parameters on both SNR and resolution is still not clear. In this paper, the one-dimensional theory of the photoacoustic radar with a pulse compressed linear frequency modulated sinusoidal laser chirp is developed. The effect of the chirp parameters on the corresponding photoacoustic signal is investigated, and guidelines for choosing the chirp parameters for resolution and SNR optimization are given based on theory and simulations. The results show that by judiciously manipulating the center frequency, bandwidth, and duration, the resolution and SNR can be easily enhanced.
光声领域的最新进展见证了雷达匹配滤波方法在连续波光声模态中的应用。在连续光声中使用匹配滤波的主要优点是信噪比（SNR）的提高，但相关过程可能会导致分辨率的损失。通过匹配滤波和频率啁啾的脉冲压缩，可以同时提高信噪比和分辨率。然而，啁啾参数对信噪比和分辨率影响的背后理论仍不明确。本文建立了具有脉冲压缩线性调频正弦激光啁啾的光声雷达的一维理论。研究了啁啾参数对相应光声信号的影响，并基于理论和模拟给出了用于分辨率和信噪比优化的啁啾参数选择指南。结果表明，通过明智地控制中心频率、带宽和持续时间，可以轻松提高分辨率和信噪比。
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