Article
Physics, Applied
Chu Zhang, Shunda Qiao, Ying He, Sheng Zhou, Lei Qi, Yufei Ma
Summary: A differential quartz-enhanced photoacoustic spectroscopy (D-QEPAS) sensor is presented in this paper. The sensor utilizes a differential photoacoustic cell (PAC) and two quartz tuning forks (QTFs) as acoustic wave transducers with high quality factor (Q). The differential mode of the D-QEPAS sensor enhances the signal by suppressing background noise and taking advantage of the resonant response of QTF. The sensor demonstrates improved sensitivity and a minimum detection limit of 496.7 ppb for trace acetylene (C2H2) gas detection.
APPLIED PHYSICS LETTERS
(2023)
Article
Acoustics
Chu Zhang, Shunda Qiao, Yufei Ma
Summary: A highly sensitive photoacoustic spectroscopy sensor based on retro-reflection-cavity-enhanced differential photoacoustic cell (DPAC) is demonstrated for the first time in this paper. Acetylene was chosen as the analyte and the DPAC was designed to suppress noise and increase signal level. The retro-reflection-cavity, consisting of two right-angle prisms, was utilized to achieve four passes of the incident light. Wavelength modulation and second harmonic demodulation techniques were employed for sensitive trace gas detection. The DPAC showed a 3.55 times improvement in the 2f signal amplitude compared to the system without the retro-reflection-cavity. Allan deviation analysis was conducted to evaluate the long-term stability of the system and the minimum detection limit (MDL) was measured to be 15.81 ppb with an integration time of 100 s.
Article
Engineering, Electrical & Electronic
Gabriele Frigenti, Lucia Cavigli, Fulvio Ratto, Sonia Centi, Tupak Garcia-Fernandez, Daniele Farnesi, Stefano Pelli, Silvia Soria, Gualtiero Nunzi Conti
Summary: Optical microresonators based on Whispering Gallery Modes have been extensively studied for fundamental research and various applications. Microbubbles resonators made from glass capillaries combine high optical and mechanical Q-factors with microfluidics. In this study, they were used as platforms for photoacoustic detection and photothermal spectroscopy, demonstrating their unique capabilities.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Acoustics
Tailin Li, Chaotan Sima, Yan Ai, Chen Tong, Jinbiao Zhao, Zikai Zhao, Ping Lu
Summary: In this paper, a symmetric multi-resonant cavity photoacoustic cell (MR-PAC) with dual microphones detection for multi-gas sensing is proposed and demonstrated. The photoacoustic cell consists of three interconnected acoustic resonators, and two microphones are symmetrically located to achieve two-point detection. Through experiments, the feasibility and performance of the MR-PAC in detecting C2H2, NO, and CF4 were validated, with minimum detection limits of 480 ppb, 260 ppb, and 0.57 ppb respectively. This compact MR-PAS system shows great potential for portable multi-gas sensing.
Article
Chemistry, Analytical
V. R. Nidheesh, Aswini Kumar Mohapatra, Rajesh Nayak, V. K. Unnikrishnan, Vasudevan Baskaran Kartha, Santhosh Chidangil
Summary: Breath analysis using spectroscopy techniques is a non-invasive method for disease diagnosis. In this study, a bimodal sensor using a 266 nm UV laser was used for breath analysis. Preliminary analysis of breath samples from Asthma patients and healthy volunteers showed distinct clusters for Asthma and normal breath samples. The method achieved high sensitivity and specificity for both photoacoustic spectroscopy (PAS) and laser-induced fluorescence (LIF). The comparison with an E-nose confirmed the validity of the UV laser-based PAS-LIF bimodal sensor for breath analysis.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Optics
Kevan Bell, Lyazzat Mukhangaliyeva, Layla Khalili, Parsin Haji Reza
Summary: The improved method utilizes photoacoustic remote sensing architecture to provide a wide range of photoacoustic excitation wavelengths, enabling effective access to endogenous chromophores. Experimental data demonstrated the device's sensitivity and efficacy in recovering cellular components in animal models.
Article
Acoustics
Xinyi Ren, Ming Yan, Zhaoyang Wen, Hui Ma, Ran Li, Kun Huang, Heping Zeng
Summary: Photoacoustic spectroscopy (PAS) using two optical combs offers broad bandwidths, high resolutions, fast acquisition speeds, and wavelength-independent detection. However, sensitivity and specificity are limited. In this study, we demonstrate comb-enabled PAS with enhanced sensitivity and nonlinear spectral hole-burning defined resolution, enabling trace detection and Doppler-free gas sensing.
Article
Optics
Hongtu Cheng, Fuping Zeng, Xiaoxing Zhang, Ju Tang, Yin Zhang
Summary: The optimization of the photoacoustic cell plays a crucial role in gas detection technology. This study proposes a new factor, the photoacoustic field (PAF)-PAC coupling term, that affects the intensity of PA signals. Through simulation and experiments, it is found that the length and radius of the resonator, as well as the focal length, impact the sound pressure distribution and the light intensity. Additionally, certain distance parameters are related to the optimal response of the gas detection system.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Nan Zhao, Dong Zhao, Longge Ma, Bin Wang
Summary: This study proposes a new type of arched photoacoustic cavity based on a study of its performance. By comparing different parameters, the optimal structural size is determined. The performance of the arched photoacoustic cavity is significantly improved compared to the traditional cylindrical cavity. A photoacoustic spectroscopy system for detecting chloroform gas is built based on the arched photoacoustic cavity, with a detection sensitivity of 0.28 ppm.
ANALYTICAL METHODS
(2022)
Article
Acoustics
Thomas Strahl, Jonas Steinebrunner, Christian Weber, Jurgen Wollenstein, Katrin Schmitt
Summary: An innovative laser based photoacoustic gas sensing concept with intrinsic miniaturization potential was developed and investigated for methane trace gas detection. The concept uses an interband cascade laser to target a specific methane absorption line feature. A MEMS microphone is implemented as an intrinsically miniaturized PA cell, serving as the gas sensing volume, acoustic resonator, and sound transducer. The sensor shows sensitive methane detection and good long-term stability, with a noise equivalent concentration of 14 ppb.
Article
Instruments & Instrumentation
Stephen Campbell, Marisa Dusseault, Ben Xu, Kirk H. Michaelian, Kristin M. Poduska
Summary: Photoacoustic spectroscopic detection enhances the intensity of weaker peaks, allowing the detection of features due to overtones, combinations, and less-abundant isotopic species. The study demonstrates that saturation is not the driving force behind these enhanced intensities, highlighting a significant knowledge gap in the theoretical basis for the enhancement of weak bands.
APPLIED SPECTROSCOPY
(2021)
Article
Optics
Tianhe Yang, Weigen Chen, Zhixian Zhang, Jiali Lei, Fu Wan, Ruimin Song
Summary: This paper presents a fiber-optic photoacoustic gas sensor enhanced by multiple reflections for detecting gas micro-leakage. By utilizing multiple reflections on the inner surface of a reflective ring, the PA signal can be effectively enhanced, achieving a minimum detection limit of 23.6 ppb.
Article
Optics
Sucheta Sharma, Mohsen Ahmadi, Jussi Rossi, Markku Vainio, Zhipei Sun, Andreas Steiger, Erkki Ikonen
Summary: We reported the photoacoustic response in the terahertz range using a silicon cantilever pressure sensor and a carbon-based radiation absorber. The mechanical response of the cantilever acted as the detector, monitoring the expansion of the carrier gas due to the heat produced by the radiation absorber. Detailed studies were conducted using the absorber material with the highest responsivity at 1.4 THz, demonstrating the potential of a single PA detector to cover a broad spectral range with consistent responsivity, large dynamic range, and high damage threshold.
Article
Optics
Yufei Ma, Yinghao Hong, Shunda Qiao, Ziting Lang, Xiaonan Liu
Summary: An H-shaped acoustic micro-resonator (AmR)-based quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor is demonstrated for the first time, which offers advantages of easy optical alignment, high utilization of laser energy, and improved detection sensitivity compared to a bare quartz tuning fork (QTF)-based sensor.
Article
Chemistry, Analytical
Kanchalar Keeratirawee, Peter C. Hauser
Summary: The research demonstrated the photoacoustic detection of ozone using the Chappuis band, with a visible red laser diode emitting at 638 nm as the light source. A highly linear calibration curve was obtained, and the limit of detection was found to be 1.6 ppmV.
Article
Optics
Amit P. Jathoul, Jan Laufer, Olumide Ogunlade, Bradley Treeby, Ben Cox, Edward Zhang, Peter Johnson, Arnold R. Pizzey, Brian Philip, Teresa Marafioti, Mark F. Lythgoe, R. Barbara Pedley, Martin A. Pule, Paul Beard
Article
Biochemical Research Methods
Julia Maerk, Franz-Josef Schmitt, Christoph Theiss, Hakan Dortay, Thomas Friedrich, Jan Laufer
BIOMEDICAL OPTICS EXPRESS
(2015)
Article
Biochemical Research Methods
Jan Laufer, Amit Jathoul, Martin Pule, Paul Beard
BIOMEDICAL OPTICS EXPRESS
(2013)
Article
Biochemical Research Methods
Jens Buchmann, Bernhard A. Kaplan, Samuel Powell, Steffen Prohaska, Jan Laufer
JOURNAL OF BIOMEDICAL OPTICS
(2019)
Article
Chemistry, Multidisciplinary
Loryn E. Theune, Jens Buchmann, Stefanie Wedepohl, Maria Molina, Jan Laufer, Marcelo Calderon
JOURNAL OF CONTROLLED RELEASE
(2019)
Article
Polymer Science
Justus F. Thuemmler, Andreas H. Roos, Jana Krueger, Dariush Hinderberger, Franz-Josef Schmitt, Guo Tang, Farzin Ghane Golmohamadi, Jan Laufer, Wolfgang H. Binder
Summary: Controlling the internal structures of single-chain nanoparticles (SCNPs) is crucial for their design and synthesis. This study focuses on SCNPs containing near-infrared fluorescent dyes embedded in hydrophobic compartments. The formation of compartments is controlled by single-chain collapse and crosslinking, resulting in SCNPs with adjustable label densities. The specific conditions for single-chain collapse have a significant impact on the formation of desired core-shell structures and the internal compartments.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Justus F. Thuemmler, Ramesh Maragani, Franz-Josef Schmitt, Guo Tang, Samira Mahmoudi Rahmanlou, Jan Laufer, Henrike Lucas, Karsten Maeder, Wolfgang H. Binder
Summary: NIR-fluorescent LCST-type single-chain nanoparticles undergo changes in photophysical behavior upon heating, which can be used as a contrast mechanism for PA imaging. Additionally, changes in polarity have significant effects on the photophysical properties of fluorescently labeled single-chain nanoparticles.
CHEMICAL COMMUNICATIONS
(2023)
Article
Imaging Science & Photographic Technology
Susanne Schrof, Genny A. Pang, Jens Buchmann, Jan Laufer
JOURNAL OF IMAGING
(2018)
Article
Physics, Multidisciplinary
Julia Maerk, Hakan Dortay, Asja Wagener, Edward Zhang, Jens Buchmann, Carsten Groetzinger, Thomas Friedrich, Jan Laufer
COMMUNICATIONS PHYSICS
(2018)
Proceedings Paper
Optics
Julia Maerk, Christoph Theiss, Franz-Josef Schmitt, Jan Laufer
PHOTONS PLUS ULTRASOUND: IMAGING AND SENSING 2015
(2015)
Proceedings Paper
Optics
Julia Maerk, Karen Ruschke, Hakan Dortay, Isabelle Schreiber, Andrea Sass, Taimoor Qazi, Matthias Pumberger, Jan Laufer
PHOTONS PLUS ULTRASOUND: IMAGING AND SENSING 2014
(2014)
Proceedings Paper
Optics
Julia Maerk, Christoph Theiss, Franz-Josef Schmitt, Jan Laufer
PHOTONS PLUS ULTRASOUND: IMAGING AND SENSING 2014
(2014)
Proceedings Paper
Optics
S. P. Johnson, O. Ogunlade, E. Zhang, J. Laufer, V. Rajkumar, R. B. Pedley, P. Beard
PHOTONS PLUS ULTRASOUND: IMAGING AND SENSING 2014
(2014)
Proceedings Paper
Optics
S. P. Johnson, O. Ogunlade, E. Zhang, J. Laufer, V. Rajkumar, S. Walker-Samuel, M. F. Lythgoe, R. B. Pedley, P. P. Beard
OPTO-ACOUSTIC METHODS AND APPLICATIONS
(2013)
Proceedings Paper
Optics
Jan Laufer, Amit Jathoul, Martin Pule, Paul Beard
PHOTONS PLUS ULTRASOUND: IMAGING AND SENSING 2013
(2013)
