Highly-sensitive photoacoustic gas sensor with dual resonant modalities for simultaneous NO and NO2 detection

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-03-12 DOI:10.1016/j.snb.2025.137596

Zhiyu Feng , Chaotan Sima , Tailin Li , Wenzhe Wang , Yufeng Pan , Lihua Wang , Zhiwen Ming , Ping Lu

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引用次数: 0

Abstract

Photoacoustic spectroscopy (PAS) gas sensors based on acoustic resonators have high detection sensitivity and are widely used for trace gas detection. However, there are challenges such as difficult time/frequency separation, low signal-to-noise ratio of higher-order modes, and high sample consumption in multi-gas detection. Here, we present a dual-modality PAS (DM-PAS) gas sensor for simultaneous detection of NO_x. The sensor incorporates two integrating spheres and a cylindrical tube to excite both Helmholtz and longitudinal resonances within a single cell. LED and QCL light sources are modulated to generate PA signals originated from the dual resonant modalities, which are detected by the array of MEMS microphones. Allan deviation analysis shows a minimum detection limit (MDL) of 61.5 ppb for nitrogen dioxide (NO₂) and 2.0 ppb for nitric oxide (NO) at over 450 s integration time. Furthermore, experimental results demonstrate the favorable repeatability and response performance of this sensor. The proposed sensor configuration provides a novel approach to realize the simultaneous detection of multiple gases.

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.