In this work, we report on a quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for hydrogen sulfide (H₂S) detection, exploiting a liquid-nitrogen-cooled THz quantum cascade laser (QCL) operating in pulsed mode. The spectrophone was designed to accommodate a THz QCL beam and consisted of a custom quartz tuning fork with a large prong spacing, coupled with acoustic resonator tubes. The targeted rotational transition falls at 2.87 THz (95.626 cm⁻¹), with a line-strength of 5.53 $\bullet$ 10^-20 cm/mol. A THz QCL peak power of 150 mW was measured at a heat sink temperature of 81 K, pulse width of 1 μs and repetition rate of 15.8 kHz. A QEPAS record sensitivity for H₂S detection in the THz range of 360 part-per-billion in volume was achieved at a gas pressure of 60 Torr and 10 s integration time.

在这项工作中，我们报告了一种用于硫化氢（H ₂ S）检测的石英增强光声光谱（QEPAS）传感器，利用以脉冲模式运行的液氮冷却太赫兹量子级联激光器（QCL）。该分光器设计用于容纳太赫兹 QCL 光束，由具有大叉齿间距的定制石英音叉以及声学谐振管组成。目标旋转跃迁落在 2.87 THz (95.626 cm ^-1 )，线强度为 5.53$\bullet$10 ^-20厘米/摩尔。在 81 K 的散热器温度、1 μs 的脉冲宽度和 15.8 kHz 的重复频率下测得太赫兹 QCL 峰值功率为 150 mW。在 60 Torr 气压和 10 s 积分时间下，QEPAS 在太赫兹范围内检测 H ₂ S 的灵敏度达到了 360 十亿分之一的体积记录​​。