Results 101 to 110 of about 825 (180)

Ppb-level detection of ammonia based on QEPAS using a power amplified laser and a low resonance frequency quartz tuning fork

, 2017
In this report, an ultra-high sensitive quartz-enhanced photoacoustic spectroscopy (QEPAS) based ammonia (NH3) sensor using a power amplified diode laser and a low resonance frequency quartz tuning fork (QTF) was demonstrated for the first time.
Ying He, Yu, Xin, Yao Tong, He, Ying, Ma, Yufei, Tittel, Frank K., Yufei Ma, Frank K. Tittel, Xin Yu, Tong, Yao   +9 more
core   +1 more source

QEPAS gas sensors for air quality monitoring

, 2020
L’activité humaine, à l’échelle d’un particulier ou à l’échelle industrielle, libère de nombreuses molécules dans l’atmosphère. Même une petite quantité de certaines de ces molécules peut dégrader la qualité de l’air. Des capteurs de gaz sont donc essentiels pour mesurer la concentration de ces molécules dans l’environnement.
openaire   +1 more source

Trace-gas monitoring by Quartz Enhanced Photoacoustic Spectroscopy (QEPAS).Application to the environmental monitoring.

, 2014
Le besoin d'analyse de gaz à l'état de traces s'est accentué ces dernières années en raison des préoccupations du public et de l'industrie sur des questions telles que le contrôle des émissions de polluants atmosphériques, la surveillance de l ...
Nguyen Ba, Tong
core  

On Developing a System Analysis Model for Trace Gas Detection using Pulsed Laser and QEPAS

, 2013
This thesis presents the development of a system analysis model for a QEPAS (Quartz Enhanced Photo Acoustic Spectroscopy)-based trace gas detection system with pulsed-laser input and sample-mean test-statistic output.
Sardesai, Neha Ravindra
core  

Quartz-enhanced laser spectroscopy sensing. [PDF]

Light Sci Appl
Qiao S, Liu X, Lang Z, He Y, Chen W, Ma Y.   +5 more
europepmc   +1 more source

Nonlinear dual-frequency modulation QEPAS using a single laser for resolving overlapping spectral features. [PDF]

Photoacoustics
Shen X, Yang L, Sun C, Gao Y, Giglio M, Sampaolo A, Patimisco P, Spagnolo V, Dong L, Wu H.   +9 more
europepmc   +1 more source

Quartz-Enhanced Photoacoustic Sensor Based on a Multi-Laser Source for In-Sequence Detection of NO₂, SO₂, and NH₃. [PDF]

Sensors (Basel), 2023
Patimisco P, Ardito N, De Toma E, Burghart D, Tigaev V, Belkin MA, Spagnolo V.   +6 more
europepmc   +1 more source

Real-time <i>in Vivo</i> monitoring of photosynthesis in individual leaves by frequency-locked quartz-enhanced photoacoustic spectroscopy. [PDF]

Photoacoustics
Liu S, Qin L, Zhou C, Lu J, Liu W, Shao J.   +5 more
europepmc   +1 more source

Simultaneous Detection of ¹²CH₄, ¹³CH₄, and Related Isotope Ratio Exploiting a Frequency-Multiplexed Mid-Infrared Quartz-Enhanced Photoacoustic Sensor. [PDF]

ACS Sens
Olivieri M, Elefante A, Menduni G, Giglio M, Wu H, Dong L, Patimisco P, Spagnolo V, Sampaolo A.   +8 more
europepmc   +1 more source

Multivariate analysis and digital twin modelling: Alternative approaches to evaluate molecular relaxation in photoacoustic spectroscopy. [PDF]

Photoacoustics, 2023
Zifarelli A, Cantatore AFP, Sampaolo A, Mueller M, Rueck T, Hoelzl C, Rossmadl H, Patimisco P, Spagnolo V.   +8 more
europepmc   +1 more source