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Updated: Apr 24, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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灵活和透明的超宽带低调频率选择性剃须刀

Xia Ma, Chenjiang Guo, Chao Huang

    Optics express
    |November 22, 2024
    PubMed
    概括

    一种新的透明频率选择性剃光器 (FSR) 提供超宽带吸收和传输. 这种用氧化物 (ITO) 薄膜制成的柔性装置显示了降低雷达截面和窗口应用的潜力.

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    Passive Filters01:27

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    Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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    Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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