Here we report on the broadband detection of nitrous oxide (N₂O) and methane (CH₄) mixtures in dry nitrogen by using a quartz-enhanced photoacoustic (QEPAS) sensor exploiting an array of 32 distributed-feedback quantum cascade lasers, within a spectral emission range of 1190−1340 cm⁻¹ as the excitation source. Methane detection down to a minimum detection limit of 200 ppb at 10 s lock-in integration time was achieved. The sensor demonstrated a linear response in the range of 200−1000 ppm. Three different mixtures of N₂O and CH₄ in nitrogen at atmospheric pressure have been analyzed. The capability of the developed QEPAS sensor to selectively determine the N₂O and CH₄ concentrations was demonstrated, in spite of significant overlap in their respective absorption spectra in the investigated spectral range.

在这里，我们报告使用石英增强的光声（QEPAS）传感器，利用32个分布式反馈量子级联激光器的阵列，在宽带氮气中宽带检测干燥氮气中的一氧化二氮（N ₂ O）和甲烷（CH ₄）混合物。光谱发射范围为1190-1340 cm ^-1作为激发源。在锁定时间为10 s时，甲烷检测量降至最低检测限200 ppb。传感器显示出200-1000 ppm范围内的线性响应。分析了大气压下氮气中N ₂ O和CH _4的三种不同混合物。研发的QEPAS传感器选择性确定N ₂ O和CH _4的能力 尽管在所研究的光谱范围内它们各自的吸收光谱有明显的重叠，但仍证明了其浓度。