Results 71 to 80 of about 3,994 (183)

Fiber evanescent wave quartz-enhanced photoacoustic spectroscopy

Acta Physica Sinica, 2018
In a conventional system of quartz-enhanced photoacoustic spectroscopy (QEPAS), the size of block-like optical collimation focusing lens group is difficult to reduce, and the structural stability is poor, which makes it hard to adapt itself to some special conditions, such as narrow space and vibrating circumstance.
null He Ying, null Ma Yu-Fei, null Tong Yao, null Peng Zhen-Fang, null Yu Xin   +4 more
openaire   +1 more source

Front-End Amplifiers for Tuning Forks in Quartz Enhanced PhotoAcoustic Spectroscopy

Applied Sciences, 2020
A study of the front-end electronics for quartz tuning forks (QTFs) employed as optoacoustic transducers in quartz-enhanced photoacoustic spectroscopy (QEPAS) sensing is reported.
Giansergio Menduni, Angelo Sampaolo, Pietro Patimisco, Marilena Giglio, Stefano Dello Russo, Andrea Zifarelli, Arianna Elefante, Piotr Z. Wieczorek, Tomasz Starecki, Vittorio M. N. Passaro, Frank K. Tittel, Vincenzo Spagnolo   +11 more
doaj   +1 more source

CleAir monitoring system for particulate matter. A case in the Napoleonic Museum in Rome [PDF]

, 2017
Monitoring the air particulate concentration both outdoors and indoors is becoming a more relevant issue in the past few decades. An innovative, fully automatic, monitoring system called CleAir is presented.
Bonacquisti, V., Chianese, A., Di Michele, M., Fazio, E., Frasca, F., Siani, Anna Maria   +5 more
core   +1 more source

Hydrogen Halide Gas Sensors: Active Materials, Operation Principles, and Emerging Technologies

Interdisciplinary Materials, Volume 5, Issue 1, Page 85-123, January 2026.
This review considers hydrogen halide (HX) gas sensors across functional materials and principles: acoustic, chemical, optical and nanophotonic. The strong acidity and reactivity of HX gases are discussed as constraints for stability and selectivity of these devices.
Xiuzhen Liu, Nikita Tukachev, Kehang Wang, Dmirty Zhirihin, Yaopeng Cheng, Pavel Krasnov, Mingzhao Song, Soslan Khubezhov, Wenping Yin, Emmanuel Stratakis, Sailing He, Andrey L. Rogach, Sergey Makarov   +12 more
wiley   +1 more source

Terahertz Photoacoustic Spectroscopy Using an MEMS Cantilever Sensor [PDF]

, 2014
In this paper, a microelectromechanical systems cantilever sensor was designed, modeled, and fabricated to measure the photoacoustic (PA) response of gases under very low vacuum conditions.
Coutu, Ronald A., Jr., Giauvitz, Nathan E., Medvedev, Ivan R., Petkie, Douglas T.   +3 more
core   +1 more source

Breath by Breath: Navigating the Landscape of Exhaled Breath in Clinical Research and Prospects for the Future

Journal of Analytical Methods in Chemistry, Volume 2026, Issue 1, 2026.
Exhaled breath analysis (EBA) has evolved as a noninvasive diagnostic technique with enormous promise in healthcare. The development in this area is based on the concept that the breathalyzers employed to measure the alcohol concentration in the blood can be utilized to evaluate health by analyzing the intricate chemical makeup of exhaled breath, which
Nisha Parikh, Hetansh Rao, Akshada Dabhade, Vishwa Patel, Vikalp Shroff, Deep Prajapati, Palak Parikh, Ketan Ranch, B. Mahalakshmi, Shery Jacob, Sai H. S. Boddu, Maria Jose Trujillo-Rodriguez   +11 more
wiley   +1 more source

Broadband detection of methane and nitrous oxide using a distributed-feedback quantum cascade laser array and quartz-enhanced photoacoustic sensing

Photoacoustics, 2020
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 ...
Marilena Giglio, Andrea Zifarelli, Angelo Sampaolo, Giansergio Menduni, Arianna Elefante, Romain Blanchard, Christian Pfluegl, Mark F. Witinski, Daryoosh Vakhshoori, Hongpeng Wu, Vittorio M.N. Passaro, Pietro Patimisco, Frank K. Tittel, Lei Dong, Vincenzo Spagnolo   +14 more
doaj   +1 more source

Visible‐Light Photoswitchable Covalent Tetra‐Ortho‐Fluoro‐Azobenzene Carbon Nanodot Hybrids for Optostimulation

ChemPhotoChem, Volume 9, Issue 12, December 13, 2025.
Tetra‐ortho‐fluoroazobenzene hybrids bound to carbon nanodots (CNDs) are prepared by covalent amide coupling. These show reversible switching between trans and cis using visible light (448 nm/530 nm), while retaining emission. The hybrids are nontoxic to cells and enable optical stimulation and offering potential for advanced light‐controlled ...
Paul P. Debes, Dominic Schatz, Anthea Villano, Yagmur Aydogan‐Sun, Juan Pablo Martínez, Michal Langer, Janis Hessling, Monika Schönhoff, Bernd M. Smarsly, Silvio Osella, Josef Wachtveitl, Maria Rosa Antognazza, Giuseppe M. Paternò, Teresa Gatti, Hermann A. Wegner   +14 more
wiley   +1 more source

Quartz-Enhanced Photoacoustic Spectroscopy for Four-Component Gas Detection Based on Two Off-Beam Acoustic Microresonators

Frontiers in Physics, 2020
A compact and portable quartz-enhanced photoacoustic spectroscopy gas sensor was developed for four-component gas detection using two off-beam acoustic microresonators The two AMRs were placed in parallel on opposing sides of a quartz tuning fork for ...
Cheng Wang, Zongliang Wang, Xiyu Pang
doaj   +1 more source

Parallel acoustic delay lines for photoacoustic tomography [PDF]

, 2012
Achieving real-time photoacoustic (PA) tomography typically requires multi-element ultrasound transducer arrays and their associated multiple data acquisition (DAQ) electronics to receive PA waves simultaneously.
Cai, Xin, Chang, Cheng-Chung, Guo, Zijian, Jeon, Mansik, Kim, Chulhong, Wang, Lihong V., Yapici, Murat Kaya, Zou, Jun   +7 more
core   +2 more sources