Qian Chuanwen, Ni Wenjun, Yang Chunyong, Zhao Zhongke, Zhang Likang, Ran Sixiang, Wang Chenyu, Lu Ping, Shum Perry Ping
Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent IOT technology, College of Electronics and Information Engineering, South-Central Minzu University, Wuhan 430074, China.
College of Engineering, Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Photoacoustics. 2025 Aug 19;45:100762. doi: 10.1016/j.pacs.2025.100762. eCollection 2025 Oct.
A novel gourd-type photoacoustic cell (GTPAC) has been developed, featuring a highly reflective, polished gold film-coated inner wall that minimizes optical loss and maximizes light utilization efficiency. GTPAC integrates two coupled spherical chambers with a radius ratio 2:3, which is close to the golden ratio. Its unique Gaussian curvature distribution enables multi-directional, disordered light beam reflection without complex optical alignment. It creates a non-periodic three-dimensional (3D) optical trajectory, significantly enhancing light-molecule interactions. GTPAC achieves an exceptionally high sensitivity of up to 3.36 μV/ppm using a distributed feedback butterfly laser with central wavelength of 1532 nm (±1.5 nm) to detect acetylene gas. When the integration time is extended to 100 s, the minimum detection limit is as low as 0.59 ppb. Moreover, its flexible design and broad spectral compatibility enable significant potential for extension to other gases, such as methane and nitrogen oxides, offering new prospects for ultra-sensitive trace gas detection.
一种新型的葫芦型光声池（GTPAC）已被开发出来，其特点是内壁镀有高反射率的抛光金膜，可将光学损耗降至最低并使光利用效率最大化。GTPAC集成了两个半径比为2:3（接近黄金比例）的耦合球形腔室。其独特的高斯曲率分布能够实现多方向、无序的光束反射，无需复杂的光学对准。它创造了一个非周期性的三维（3D）光学轨迹，显著增强了光与分子的相互作用。使用中心波长为1532 nm（±1.5 nm）的分布反馈蝶形激光器检测乙炔气体时，GTPAC实现了高达3.36 μV/ppm的极高灵敏度。当积分时间延长到100 s时，最低检测限低至0.59 ppb。此外，其灵活的设计和广泛的光谱兼容性使其在扩展到其他气体（如甲烷和氮氧化物）方面具有巨大潜力，为超灵敏痕量气体检测提供了新的前景。
