Results 71 to 80 of about 1,306,141 (231)
An open-path, hand-held laser system for the detection of methane gas [PDF]
, 2005 We have developed an open-path hand-held gas detector incorporating a distributed feedback InGaAs laser diode at 1.65 µm. Incorporated into a hand-held transceiver unit, the emitted laser beam is backscattered from nearby surfaces, collected and focused ...
Padgett, M +13 more
core +1 more source
BMEMat, EarlyView.A near‐infrared (NIR) light‐activated “lock‐key” nanodevice is reported for spatiotemporally resolved detection of intratumoral L‐lactate. The system stays silent until deep‐penetrating NIR light remotely unlocks its function, allowing for precise sensing within tumors.
Siyu Pan +8 more
wiley +1 more source
Photoacoustic phase-controlled Fourier-transform infrared spectroscopy
, 2022 We demonstrate a 13-fold speed improvement in broadband cantilever-enhanced photoacoustic spectroscopy (CEPAS) by combining it with phase-controlled Fourier-transform spectroscopy (PC-FTS) instead of traditional Fourier-transform infrared spectroscopy ...
Vainio, Markku +2 more
core +2 more sources
Laser photoacoustic spectroscopy applications in breathomics
Journal of Biomedical Photonics & Engineering, 2019 The breathomics approach to express-diagnosis of bronchopulmonary diseases based on spectral analysis of volatile organic compounds in a patient’s exhaled air is discussed.
Yury V. Kistenev +4 more
doaj +1 more source
Photoacoustic spectroscopy of bacteriorhodopsin photocycle
Biophysical Journal, 1983 Photoacoustic spectroscopy was applied to study the energetics and the kinetics of the slow intermediates of the bacteriorhodopsin photocycle. An analysis of the modulation frequency dependence of the photoacoustic signal allowed us to estimate the enthalpy changes and the kinetic parameters associated with those intermediates.
Renard, M., Thirion, P., Delmelle, M.
openaire +2 more sources
Photoacoustic spectroscopy for remote detection of liquid contamination [PDF]
, 2004 The remote detection and identification of liquid chemical contamination is a difficult problem for which no satisfactory solution has yet been found. We have investigated a new technique, pulsed indirect photoacoustic spectroscopy (PIPAS), and made an ...
Benton, David M. +3 more
core +1 more source
ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.Clinicians often concurrently tackle critical challenges including emergency hemorrhage, secondary infection, and the elusive tracking of biodegradation of conventional hemostatic agents for complex wounds. Here, we report an intelligent hemostatic sponge (spCS@AIE) by incorporating aggregation‐induced emission (AIE) nanoparticles with short‐wave ...
Zhicheng Liu +12 more
wiley +1 more source
Photoacoustic Techniques for Trace Gas Sensing Based on Semiconductor Laser Sources
Sensors, 2009 The paper provides an overview on the use of photoacoustic sensors based on semiconductor laser sources for the detection of trace gases. We review the results obtained using standard, differential and quartz enhanced photoacoustic techniques.
Vincenzo Spagnolo +3 more
doaj +1 more source
Methane monitoring by near infrared photoacoustic spectroscopy: The importance of relaxation phenomena [PDF]
The importance of molecular relaxation in photoacoustic spectroscopy is discussed. The particular case of methane monitoring in dry oxygen using a 1.65-μm laser-based photoacoustic sensor is reported.
Thévenaz, Luc +2 more
core +2 more sources
ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.Low‐dimensional materials (0D, 1D, and 2D) exhibit unique electronic and physicochemical properties, enabling advanced nanoelectronic and optoelectronic devices. Mixed‐dimensional heterostructures combine these materials to enhance functionality.
Qaisar Alam +3 more
wiley +1 more source