scholarly journals High Energy Double Peak Pulse Laser Induced Plasma Spectroscopy for Metal Characterization Using a Passively Q-Switched Laser Source and CCD Detector

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3634
Author(s):  
Juri Agresti ◽  
Andrea Azelio Mencaglia ◽  
Salvatore Siano
Keyword(s):  
Pulse Laser ◽  
Yttrium Aluminum Garnet ◽  
Low Cost ◽  
Laser Pulses ◽  
High Energy ◽  
Laser Source ◽  
Plasma Spectroscopy ◽  
Double Peak ◽  
Temporal Separation ◽  
Laser Induced Plasma

Here, the development and testing of a portable double peak pulse laser induced plasma spectroscopy (DPP-LIPS) based on passively Q-switched Nd:YAG (Neodymium-doped Yttrium Aluminum Garnet) laser excitation is reported. The latter delivered structured laser pulses at a repetition rate of up to 20 Hz, including two energy peaks of about 100 mJ each with a relative temporal spacing of about 80 µs. Plasma spectra were collected using a low-cost Czerny–Turner spectrometer equipped with a non-intensified CCD (Charge-Coupled Device) array. Such a DPP-LIPS setup is technologically simpler and cheaper than the usual ones. Despite the relatively large temporal separation between the mentioned laser peaks, significant spectral intensity enhancements with respect to the usual single peak pulse configuration were observed. The amplification factor measured ranged between 2 and 10, depending on the specific emission peaks and the Q-switched configuration, and a consequent significant improvement of the detection limit of trace elements was observed. The instrument was calibrated for the quantitative analysis of copper alloy through systematic measurements carried out on reference samples and was then tested in an example archaeometric characterization of a statuette from the Egyptian Museum of Florence.

Design of a low-cost detection system for laser-induced plasma spectroscopy

1999 ◽  
Vol 70 (9) ◽  
pp. 3519-3522 ◽  
Author(s):  
R. E. Neuhauser ◽  
B. Ferstl ◽  
C. Haisch ◽  
U. Panne ◽  
R. Niessner
Keyword(s):  
Detection System ◽  
Low Cost ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma

scholarly journals A new method on diagnostics of muons produced by a short pulse laser

2017 ◽  
Vol 5 ◽  
Author(s):  
Feng Zhang ◽  
Boyuan Li ◽  
Lianqiang Shan ◽  
Bo Zhang ◽  
Wei Hong ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Short Pulse ◽  
Detection System ◽  
Low Cost ◽  
High Energy ◽  
Radiation Background ◽  
Short Pulse Duration ◽  
Short Pulse Laser ◽  
Muon Lifetime ◽  
Scintillator Detector

Muons produced by a short pulse laser can serve as a new type of muon source having potential advantages of high intensity, small source emittance, short pulse duration and low cost. To validate it in experiments, a suitable muon diagnostics system is needed since high muon flux generated by a short pulse laser shot is always accompanied by high radiation background, which is quite different from cases in general muon researches. A detection system is proposed to distinguish muon signals from radiation background by measuring the muon lifetime. It is based on the scintillator detector with water and lead shields, in which water is used to adjust energies of muons stopped in the scintillator and lead to against radiation background. A Geant4 simulation on the performance of the detection system shows that efficiency up to 52% could be arrived for low-energy muons around 200 MeV and this efficiency decreases to 14% for high-energy muons above 1000 MeV. The simulation also shows that the muon lifetime can be derived properly by measuring attenuation of the scintilla light of electrons from muon decays inside the scintillator detector.

Development of a Fiber Delivered Laser Ignition System for Natural Gas Engines

2006 ◽  
Author(s):  
Azer P. Yalin ◽  
Adam R. Reynolds ◽  
Sachin Joshi ◽  
Morgan W. Defoort ◽  
Bryan Willson ◽  
...  
Keyword(s):  
Natural Gas ◽  
Fiber Optics ◽  
High Efficiency ◽  
Low Cost ◽  
Laser Pulses ◽  
Hollow Fibers ◽  
Laser Source ◽  
Laser Ignition ◽  
Design Development ◽  
Natural Gas Engines

Laser ignition is viewed as a potential future technology for advanced high-efficiency low-emission natural gas engines. However, in order to make laser ignition systems more practical, thereby enabling them to transition from the laboratory to industrial settings, there is a need to develop fiber optically delivered ignition systems. Recent work at Colorado State University has shown the possibility of using coated hollow fibers for spark delivery and has demonstrated laser ignition and operation of a single engine cylinder using hollow fiber delivery. In order to practically operate a multiple cylinder engine, we envisage a simple and low-cost system based upon a single laser source being delivered (“multiplexed”) through multiple fibers to multiple engine cylinders. In this paper, we report on the design, development, and initial bench-top testing of a multiplexer. Bench-top testing showed that the multiplexer can be positioned with the required accuracy and precision for launching into fiber optics, and can be switched at the relatively high switching rates needed to operate modern natural gas engines. Another test employed the multiplexer to alternately launch laser pulses into a pair of hollow fibers in a way that allows spark creation downstream of the fibers.

scholarly journals A Study of the Characteristics of Plasma Generated by Infrared Pulse Laser-Induced Fused Silica

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1009
Author(s):  
Lixue Wang ◽  
Xudong Sun ◽  
Congrui Geng ◽  
Zequn Zhang ◽  
Jixing Cai
Keyword(s):  
Pulse Laser ◽  
Pulse Width ◽  
Laser Energy ◽  
High Energy ◽  
Fused Silica ◽  
Expansion Velocity ◽  
Generation Process ◽  
Experimental Conditions ◽  
Maximum Expansion ◽  
Laser Induced Plasma

When high energy infrared laser pulses are incident on fused silica, the surface of the fused silica is damaged and a laser-induced plasma is produced. Based on the theory of fluid mechanics and gas dynamics, a two-dimensional axisymmetric gas dynamic model was established to simulate the plasma generation process of fused silica induced by a millisecond pulse laser. The results show that the temperature of the central region irradiated by the laser is the highest, and the plasma is first produced in this region. When the laser energy density is 1.0 × 104 J/cm2 and the pulse width is 0.2 ms, the maximum expansion velocity of the laser-induced plasma is 17.7 m/s. Under the same experimental conditions, the results of the simulation and experiment are in good agreement. With an increase in pulse width, the plasma expansion rate gradually decreases.

Nondestructive Evaluation of Concrete Structures by Laser Ultrasonic Method

2004 ◽  
Author(s):  
Shigenori Akamatsu ◽  
Tomosumi Kamimura ◽  
Katsunori Yokoi ◽  
Haruya Shiba ◽  
Toshihiro Tanizawa ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Nondestructive Evaluation ◽  
Pulse Laser ◽  
Ultrasonic Method ◽  
Concrete Structures ◽  
Laser Pulses ◽  
Ultrasonic Waves ◽  
Laser Source ◽  
Laser Ultrasonic ◽  
Laser Ultrasonic Method

The nondestructive testing of concrete structures has been attempted using ultrasonic methods such as impact echo methods, though no automated remote testing method has been realized yet. The laser ultrasonic method is a non-contact nondestructive evaluation method that uses short laser pulses to generate and Continuous Wave (CW) laser radiation to detect ultrasonic waves. In the applications of ultrasonic to nondestructive testing, it is necessary to choice the characteristics of the ultrasonic field radiated by the ultrasonic transmitter. The characteristics of that exited by laser pulses determine the usefulness in detecting flaws. In this paper, we present experimental results of investigation of relation between the waveforms of the ultrasonic exited by Q-switched pulse laser and the wavelengths of the pulse laser in concrete. The experiment was carried out using the Q-switched pulse laser of several wavelengths. We clarify that it is possible to control the amplitude and the pulse width of P-wave by a choice of the pulse energy and the wavelength of the laser source respectively.

Experimental investigation and modelling of double pulse laser induced plasma spectroscopy under water

2005 ◽  
Vol 60 (7-8) ◽  
pp. 975-985 ◽  
Author(s):  
A. Casavola ◽  
A. De Giacomo ◽  
M. Dell'Aglio ◽  
F. Taccogna ◽  
G. Colonna ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Pulse Laser ◽  
Double Pulse ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma ◽  
Double Pulse Laser

scholarly journals Laser-Plasma Spectroscopy of Hydroxyl with Applications

2020 ◽  
Author(s):  
Christian G. Parigger ◽  
Christopher M. Helstern ◽  
Benjamin S. Jordan ◽  
David M. Surmick ◽  
Robert Splinter
Keyword(s):  
Time Delays ◽  
Line Strength ◽  
Emission Spectra ◽  
Laser Pulses ◽  
Supplementary File ◽  
Plasma Spectroscopy ◽  
Air Plasma ◽  
Strength Data ◽  
Laser Induced Plasma ◽  
Plasma Measurements

This article discusses laser-induced laboratory-air plasma measurements and analysis of hydroxyl (OH) ultraviolet spectra. New experiments with Q-switched laser pulses illustrate occurrence of molecular recombination spectra for time delays of the order of several dozen of microseconds after plasma initiation. The computation of the emission spectra utilizes line strength data that are communicated as a supplementary file. Applications of detailed OH computations include laser-induced plasma and combustion analyses, to name but two applications.

Janus – A New Approach to Air Combat Pilot Training

2019 ◽  
Vol 2019 (4) ◽  
pp. 7-22
Author(s):  
Georges Bridel ◽  
Zdobyslaw Goraj ◽  
Lukasz Kiszkowiak ◽  
Jean-Georges Brévot ◽  
Jean-Pierre Devaux ◽  
...  
Keyword(s):  
Low Cost ◽  
Cost Effective ◽  
High Energy ◽  
Training System ◽  
Embedded Sensors ◽  
Pilot Training ◽  
New Approach ◽  
Combat Aircraft ◽  
Air Combat ◽  
The Cost

Abstract Advanced jet training still relies on old concepts and solutions that are no longer efficient when considering the current and forthcoming changes in air combat. The cost of those old solutions to develop and maintain combat pilot skills are important, adding even more constraints to the training limitations. The requirement of having a trainer aircraft able to perform also light combat aircraft operational mission is adding unnecessary complexity and cost without any real operational advantages to air combat mission training. Thanks to emerging technologies, the JANUS project will study the feasibility of a brand-new concept of agile manoeuvrable training aircraft and an integrated training system, able to provide a live, virtual and constructive environment. The JANUS concept is based on a lightweight, low-cost, high energy aircraft associated to a ground based Integrated Training System providing simulated and emulated signals, simulated and real opponents, combined with real-time feedback on pilot’s physiological characteristics: traditionally embedded sensors are replaced with emulated signals, simulated opponents are proposed to the pilot, enabling out of sight engagement. JANUS is also providing new cost effective and more realistic solutions for “Red air aircraft” missions, organised in so-called “Aggressor Squadrons”.

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