Application of Broadband Photoacoustic Spectroscopy in Methane Concentration Detection

Shenlong, 查申龙 Zha; Hongliang, 马宏亮 Ma; Changli, 查长礼 Zha; Jiajin, 陈家金 Chen; Xing, 黄星 Huang; Kun, 刘锟 Liu; Shengbao, 占生宝 Zhan

doi:10.3788/lop56.043001

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the PAS techniques, the light source directly affects the working modes and detection performance. These include popular narrow bandwidth lasers [12][13][14], mid-infrared LEDs [15], and infrared blackbody radiation sources [16]. Lasers are generally used to detect single-component gases in the resonant mode.…”

Section: Introductionmentioning

confidence: 99%

High-Precision Low-Cost Mid-Infrared Photoacoustic Gas Sensor Using Aspherical Beam Shaping for Rapidly Measuring Greenhouse Gases

Hu,

Ai,

Sima

et al. 2024

Photonics

View full text Add to dashboard Cite

A high-precision low-cost mid-infrared photoacoustic sensor for greenhouse composite gases based on aspherical beam shaping is proposed and demonstrated. The assembled optical source module and luminous characteristics of infrared source are innovatively investigated and analyzed with aspherical beam shaping. The proposed aspherical-beam-shaping-technique could effectively reduce optical loss and enhance system sensitivity, achieving an effective power utilization ratio of a radiation source of 91% and sidewall noise ratio of 8.9%. Experiments verify the 1.7 times improvement in responsivity and 50% enhancement in minimum detection limit (MDL) on average. In terms of comprehensive greenhouse gas composites and with short integration time of 1 s, MDLs of CO2, CH4, N2O, NF3, SF6, PFC-14, and HFC-134a are 73 ppb, 267 ppb, 72 ppb, 81 ppb, 14 ppb, 9 ppb and 115 ppb, respectively. Furthermore, a 48 h continuous monitoring of H2O, CO2 and CH4 in the atmosphere is conducted and verifies the performance of the gas sensor. The developed sensor allows for the rapid route of low-cost and high-precision detection of multiple greenhouse gases.

show abstract