Robust and compact light-induced thermoelastic sensor for atmospheric methane detection based on a vacuum-sealed subminiature tuning fork

IF 7.1 1区医学 Q1 ENGINEERING, BIOMEDICAL

Photoacoustics Pub Date : 2025-01-20 DOI:10.1016/j.pacs.2025.100691

Zhijin Shang , Hongpeng Wu , Gang Wang , Ruyue Cui , Biao Li , Ting Gong , Guqing Guo , Xuanbing Qiu , Chuanliang Li , Lei Dong

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引用次数: 0

Abstract

A compact light-induced thermoelastic spectroscopy (LITES) instrument incorporating a subminiature quartz tuning fork (QTF) was developed for atmospheric methane (CH₄) sensing. The QTF features prong dimensions of 1700 µm in length and 120 µm in width, which enable substantial thermoelastic expansion at the microscale, significantly enhancing the piezoelectric signal. The subminiature QTF was vacuum sealed to achieve a high quality factor of 20,511 and a temperature coefficient of frequency of − 0.91 ppm/℃, ensuring a high detection sensitivity and robustness for the LITES sensor. Under identical vacuum conditions, the subminiature QTF demonstrated a twofold signal enhancement compared to the standard QTF, resulting in a minimum detection limit (MDL) of 47 ppb with a 300-ms averaging time. Continuous measurements of atmospheric CH₄ levels over five days were conducted to evaluate the accuracy and robustness of the developed sensor for long-duration monitoring applications.

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来源期刊

Photoacoustics Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

11.40

自引率

16.50%

发文量

审稿时长

53 days

期刊介绍： The open access Photoacoustics journal (PACS) aims to publish original research and review contributions in the field of photoacoustics-optoacoustics-thermoacoustics. This field utilizes acoustical and ultrasonic phenomena excited by electromagnetic radiation for the detection, visualization, and characterization of various materials and biological tissues, including living organisms. Recent advancements in laser technologies, ultrasound detection approaches, inverse theory, and fast reconstruction algorithms have greatly supported the rapid progress in this field. The unique contrast provided by molecular absorption in photoacoustic-optoacoustic-thermoacoustic methods has allowed for addressing unmet biological and medical needs such as pre-clinical research, clinical imaging of vasculature, tissue and disease physiology, drug efficacy, surgery guidance, and therapy monitoring. Applications of this field encompass a wide range of medical imaging and sensing applications, including cancer, vascular diseases, brain neurophysiology, ophthalmology, and diabetes. Moreover, photoacoustics-optoacoustics-thermoacoustics is a multidisciplinary field, with contributions from chemistry and nanotechnology, where novel materials such as biodegradable nanoparticles, organic dyes, targeted agents, theranostic probes, and genetically expressed markers are being actively developed. These advanced materials have significantly improved the signal-to-noise ratio and tissue contrast in photoacoustic methods.