Effect of temperature on glucose photoacoustic detection based on the pulsed laser induced ultrasonic

2017 ◽  
Author(s):  
Zhong Ren ◽  
Guodong Liu ◽  
Yu Ding
Keyword(s):  
Pulsed Laser ◽  
Effect Of Temperature ◽  
Photoacoustic Detection

scholarly journals Ultrahigh Resolution Pulsed Laser-Induced Photoacoustic Detection of Multi-Scale Damage in CFRP Composites

2020 ◽  
Vol 10 (6) ◽  
pp. 2106 ◽  
Author(s):  
Siqi Wang ◽  
Jesse Echeverry ◽  
Luis Trevisi ◽  
Kiana Prather ◽  
Liangzhong Xiang ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Projection Algorithm ◽  
Two Dimensional ◽  
High Frequency Ultrasound ◽  
Photoacoustic Detection ◽  
Ultrahigh Resolution ◽  
Multi Scale ◽  
Cfrp Composites ◽  
Macro Scale ◽  
Non Destructive

This paper presents a photoacoustic non-destructive evaluation (pNDE) system with an ultrahigh resolution for the detection of multi-scale damage in carbon fiber-reinforced plastic (CFRP) composites. The pNDE system consists of three main components: a picosecond pulsed laser-based ultrasonic actuator, an ultrasound receiver, and a data acquisition/computing subsystem. During the operation, high-frequency ultrasound is generated by pulsed laser and recorded by an ultrasound receiver. By implementing a two-dimensional back projection algorithm, pNDE images can be reconstructed from the recorded ultrasound signals to represent the embedded damage. Both potential macroscopic and microscopic damages, such as surface notches and delamination in CFRP, can be identified by examining the reconstructed pNDE images. Three ultrasonic presentation modes including A-scan, B-scan, and C-scan are employed to analyze the recorded signals for the representation of the detected micro-scale damage in two-dimensional and three-dimensional images with a high spatial resolution of up to 60 µm. Macro-scale delamination and transverse ply cracks are clearly visualized, identifying the edges of the damaged area. The results of the study demonstrate that the developed pNDE system provides a non-destructive and robust approach for multi-scale damage detection in composite materials.

Pulsed laser photoacoustic detection of SO_2 near 2257 nm

2001 ◽  
Vol 40 (12) ◽  
pp. 2010 ◽  
Author(s):  
Mohammed A. Gondal ◽  
Joseph Mastromarino
Keyword(s):  
Pulsed Laser ◽  
Photoacoustic Detection

Photoacoustic Detection of Formaldehyde as a Minority Component in Gas Mixtures

1988 ◽  
Vol 42 (8) ◽  
pp. 1520-1524 ◽  
Author(s):  
M. Boutonnat ◽  
D. A. Gilmore ◽  
K. A. Keilbach ◽  
N. Oliphant ◽  
G. H. Atkinson
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Pulsed Laser ◽  
Gas Permeation ◽  
Selective Detection ◽  
Experimental Protocol ◽  
Photoacoustic Detection ◽  
Gaseous Mixtures ◽  
Spectral Signatures ◽  
Order Of Magnitude ◽  
Co Concentrations

Concentrations of H2CO in the part-per-billion by volume (ppbv) range are determined in gaseous mixtures containing large excesses of NO2 CH3CHO, and N2 by the use of photoacoustic spectroscopy (PAS). Mixtures containing H2CO as a minority component are prepared by gas permeation methods and examined by pulsed laser PAS in the ultraviolet and visible spectral regions. The relative concentrations of the major components of each mixture are an order of magnitude or more larger than the H2CO component under study. PA spectra with 0.5-cm−1 resolution in the 302.5–303.8 nm region are presented in Fig. 3 and are used to identify spectral signatures needed for selective detection. The dependence of PA signals on concentration is determined separately for each of the three polyatomic components in samples with N2. An experimental protocol for quantitatively measuring H2CO concentrations near 50 ppbv in NO2, CH3CHO, and N2 mixtures is described.

Effect of temperature on pulsed laser deposition of ZnO films

2006 ◽  
Vol 252 (12) ◽  
pp. 4321-4326 ◽  
Author(s):  
M. Liu ◽  
X.Q. Wei ◽  
Z.G. Zhang ◽  
G. Sun ◽  
C.S. Chen ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Effect Of Temperature ◽  
Zno Films

Effect of temperature on pulsed laser deposition of HgCdTe films

2007 ◽  
Vol 253 (24) ◽  
pp. 9291-9294 ◽  
Author(s):  
M. Liu ◽  
B.Y. Man ◽  
X.C. Lin ◽  
X.Y. Li ◽  
C.S. Chen
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Effect Of Temperature
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