Hou Liangtao, Li Yan, Sun Libin, Liu Chao, Zheng Yichao, Liu Yi, Qu Shiliang
Department of Optoelectronics Science, Harbin Institute of Technology, Weihai 264209, China.
Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Nanophotonics. 2023 Sep 20;12(19):3707-3719. doi: 10.1515/nanoph-2023-0209. eCollection 2023 Sep.
A high-fidelity optical fiber microphone (HF-OFM) with hybrid frequency and fast response is theoretically and experimentally demonstrated by the nanofabrication techniques for real-time communication, which consists of a graphene oxide (GO) film, an Au nanocoating, and an air cavity. The internal stress of the film is increased by the method of mechanical tensile preparation, and the microphone response flatness is improved. Meanwhile, the structural design of the 3 nm Au nanocoating improves the acoustic pressure detection sensitivity by 2.5 times by increasing the reflectivity. The experimental result shows that single, dual, and triple frequency acoustic signal detection in the frequency range of 0.1 kHz-20 kHz are achieved with acoustic pressure sensitivities of 9.64, 9.66, and 8.9 V/Pa, as well as flat frequency response (<2 dB variation). The minimum detectable pressure (MDP) at 1 kHz is 63.25 μPa/Hz. In addition, the high-fidelity real-time transmission of audio signals over an angle range of -90° to 90° is verified by a self-made acoustic pressure detection device. Such a compact, high sensitivity, and large measurement range HF-OFM is very promising for applications of oil leakage exploration, acoustic source location, and real-time communication.
通过纳米制造技术，从理论和实验上证明了一种具有混合频率和快速响应的高保真光纤麦克风（HF-OFM），用于实时通信，它由氧化石墨烯（GO）薄膜、金纳米涂层和空气腔组成。通过机械拉伸制备方法增加了薄膜的内应力，提高了麦克风响应的平坦度。同时，3nm金纳米涂层的结构设计通过提高反射率将声压检测灵敏度提高了2.5倍。实验结果表明，在0.1kHz-20kHz频率范围内实现了单频、双频和三频声信号检测，声压灵敏度分别为9.64、9.66和8.9V/Pa，频率响应平坦（变化<2dB）。1kHz时的最小可检测压力（MDP）为63.25μPa/Hz。此外，通过自制的声压检测装置验证了音频信号在-90°至90°角度范围内的高保真实时传输。这种紧凑、高灵敏度和大测量范围的HF-OFM在漏油探测、声源定位和实时通信应用中非常有前景。
