Results 51 to 60 of about 3,951 (191)

QEPAS based ppb-level detection of CO and N2O using a high power CW DFB-QCL [PDF]

, 2013
An ultra-sensitive and selective quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor platform was demonstrated for detection of carbon monoxide (CO) and nitrous oxide (N2O). This sensor used a stateof- the art 4.61 μm high power, continuous wave
Bauer, Chao, Curl, Dong, Dong, Elia, Frank K. Tittel, Gray, Grinde, Joly, Khalil, Kosterev, Kosterev, Lewicki, Li, Logan, Lu, Manijeh Razeghi, McManus, McManus, Mitsui, Moeskops, Mohn, Nelson, Rafał Lewicki, Ravishankara, Razeghi, Rothman, Schilt, Vanderover, Yi, Yuanyuan, Yufei Ma   +32 more
core   +1 more source

Enhanced photoacoustic spectroscopy sensitivity through intra-cavity OPO excitation [PDF]

, 2018
We report an optical molecular gas sensor exhibiting high levels of selectivity and sensitivity. The outstanding sensitivity demonstrated by our technology is rooted in a novel combination of photoacoustic spectroscopy (PAS) operated within the cavity of
Polak, Adam, Stothard, David J.M.
core   +1 more source

Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline

Frontiers in Physics, 2022
A convenient method of light intensity correction for quartz-enhanced photoacoustic spectroscopy (QEPAS) using photothermal baseline is demonstrated. The laser beam passes through the prongs of the quartz tuning fork (QTF) and then focused on the root of
Xiang Chen, Xiang Chen, Mai Hu, Mai Hu, Hao Liu, Hao Liu, Lu Yao, Zhenyu Xu, Ruifeng Kan   +8 more
doaj   +1 more source

Compact all-fiber quartz-enhanced photoacoustic spectroscopy sensor with a 30.72 kHz quartz tuning fork and spatially resolved trace gas detection [PDF]

, 2016
An ultra compact all-fiber quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor using quartz tuning fork (QTF) with a low resonance frequency of 30.72 kHz was demonstrated.
He, Ying, Ma, Yufei, Sun, Rui, Tittel, Frank K., Yu, Xin, Zhang, Jingbo   +5 more
core   +1 more source

Quartz tuning fork embedded off-beam quartz-enhanced photoacoustic spectroscopy

Optics Letters, 2019
In order to achieve a high acoustic coupling strength and detection sensitivity and to simplify the assembly and alignment process in quartz-enhanced photoacoustic spectroscopy (QEPAS) technique, a novel quartz tuning fork (QTF) embedded off-beam QEPAS (E-OB-QEPAS) spectrophone was proposed.
Lien Hu, Chuantao Zheng, Jie Zheng, Yiding Wang, Frank K. Tittel   +4 more
openaire   +2 more sources

Biodegradable Nitrogen-Doped Carbon Nanodots for Non-Invasive Photoacoustic Imaging and Photothermal Therapy [PDF]

, 2016
Multifunctional nanoparticles have been widely investigated for biomedical applications, such as imaging, therapy, and drug delivery. Especially, photoactive nanoparticles have received great attention as theranostic agents because of their heat ...
Beack, S, Hahn, SK, Kim, C, Kim, H, Kwon, W, Lee, C, Lee, D, Park, Y, Rhee, S-W   +8 more
core   +3 more sources

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

Thermally Gated Dual‐Cascade Nanozyme for Enhanced Mild‐Temperature Photothermal Therapy

Advanced Science, EarlyView.
A thermo‐responsive cascade nanozyme (Ru‐GOx‐PNN) synergistically enhances mild photothermal therapy by dual suppression of HSP70 through ROS‐induced lipid peroxidation and ATP depletion. This intelligent system effectively overcomes thermotolerance and amplifies apoptosis, offering a safe and precise strategy for tumor treatment.
Shuyu Wang, Shenghui Wang, Mengyuan Cao, Lulu Wang, Wei Jiang, Xiyun Yan, Ying Liu, Bing Jiang   +7 more
wiley   +1 more source

MEMS-Based Terahertz Photoacoustic Chemical Sensing System [PDF]

, 2016
Advancements in microelectromechanical system (MEMS) technology over the last several decades has been a driving force behind miniaturizing and improving sensor designs.
Coutu, Ronald A., Jr., Glauvitz, Nathan, Medvedev, Ivan R., Petkie, Douglas T.   +3 more
core   +1 more source

Small-Size Resonant Photoacoustic Cell of Inclined Geometry for Gas Detection

, 2009
A photoacoustic cell intended for laser detection of trace gases is represented. The cell is adapted so as to enhance the gas-detection performance and, simultaneously, to reduce the cell size.
A. L. Ulasevich, A. Miklos, A. Olafsson, A. V. Gorelik, A.A. Kosterev, A.A. Kosterev, A.K.Y. Ngai, A.V. Gorelik, B.A. Paldus, D. Hofstetter, E. Huang, F. N. Nikonovich, F.G.C. Bijnen, F.J.M. Harren, F.R.E. Gruijl, J. Oomens, L.R. Narasimhan, M. P. Zakharich, M.B. Pushkarsky, M.M.J.W. Herpen van, N. S. Kazak, P. Kestler, R. Flindt, R. Lewicki, R.A. Rooth, R.F. Curl, S. Bernegger, S.L. Firebaugh, V. A. Firago, V. S. Starovoitov, V.P. Zharov, V.S. Starovoitov, V.S. Starovoitov, W. Urban, W.J. Witteman   +34 more
core   +1 more source