Compact methane sensor using an integrating sphere and Interband Cascade Laser at 3313 nm
Compact methane sensor using an integrating sphere and Interband Cascade Laser at 3313 nm
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DOI：
10.1016/j.snb.2023.133866
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发表时间：
2023-04
期刊：
影响因子：
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通讯作者：
N. Davis;D. Francis;J. Hodgkinson;R. Tatam
中科院分区：
文献类型：
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作者：
N. Davis;D. Francis;J. Hodgkinson;R. Tatam
我们提出了一种气体检测传感器，利用积分球和带间级联激光器的可调谐二极管激光吸收光谱（TDLAS）。使用有效光程为70.1 cm的积分球测量3313 nm处的甲烷吸收线。气体浓度从归一化吸收光谱估计，其中线拟合到扫描内的7条吸收线。测试表明，对于浓度在0-50 ppm范围内的合成空气中的甲烷，测量结果是线性的。平均时间为20 s时，噪声等效甲烷浓度为180 ppb（1σ）。该系统需要最小的对准，初步测量表明该系统对激光输入的振动和未对准不敏感。没有对准光学元件也使其紧凑（190×170× 120 mm）和坚固。
We present a sensor for gas detection utilising an integrating sphere and interband cascade laser for tunable diode laser absorption spectroscopy (TDLAS). Measurements were made of the methane absorption line at 3313 nm using an integrating sphere with an effective pathlength of 70.1 cm. Gas concentrations were estimated from normalised absorption spectra with line fitting to 7 absorption lines within the scan. Testing showed that measurements were linear for methane in synthetic air for concentrations in the range 0–50 ppm. With an averaging time of 20 s, the noise-equivalent methane concentration was 180 ppb (1σ). The system requires minimal alignment, with preliminary measurements indicating the system is insensitive to vibration and misalignment of the laser input. The lack of alignment optics also allows it to be compact (190×170×120mm) and robust.