Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"Laser-induced plasma"”.
-
Laser induced plasma ablation of biological tissue
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1985.
-
VUV laser-induced plasma spectroscopy for low level sulphur detection in steel
When a short, high energy pulse of laser light is focused onto a solid target a high density, high temperature plasma is formed. This plasma emits radiation across a wide spectral range, from the x-ray to the infra-red. In this thesis, a variant of the well-established spectroscopic technique known …
-
Analysis of a laser induced plasma in high pressure SF6 gas for high-voltage, high-current switching
<p>The Laser Triggered Switch Program at Sandia National Laboratories is an intensive development study to understand and optimize the laser triggered gas switch (LTGS) for the Z-Refurbishment (ZR) project. The laser triggered gas switch is the final command-triggered switch in the machine, and …
-
Laser induced emission spectrometry for rapid elemental analysis.
This thesis reports investigations into laser-induced emission spectrometry for rapid elemental analysis. An integrated laser and spectrometer system is configured, comprising a Q-switched Nd:YAG laser and an optical multichannel analyser, which enables the discreet monitoring of the laser-induced …
-
Investigation of Resonant Enhanced Multiphoton Ionization of Solid State High Explosives With Laser Ablation
… ionization of solid high explosives following laser desorption. This study is driven by the need for new, fast and reliable in-situ detection techniques for hazardous materials such as high explosives, in order to reduce the danger of exposure of first responders, to provide early warning and …
-
All-solid-state femtosecond medical lasers and nonlinear laser-tissue interactions
Diode pumped all-solid-state ultrafast lasers are promising for mini-invasive refractive surgery and keratoplasty. A funda mental systematical study concerning ultrafast laser tissue interactions is crucial before applying the state of the art laser technology to ophthalmic applications. Porcine …
-
In-Situ Spectrocopy: Gas Mixture Analysis Using A Simplified Multi-Pass Capillary Cell and Optical Considerations In Dual-Pulse Laser-Induced Breakdown Spectroscopy Analysis of Bulk Aqueous Solutions
… Raman Spectroscopy and considerations for a laser-induced breakdown spectroscopic method geared towards in-situ analysis of hydrothermal vents. </p> <p> Chapter 1 will describe a novel, yet simple gas sensor that utilizes a fiber-optic Raman sensor coupled to a simplified multi-pass capillary …
-
Laboratory evaluation of laser-induced breakdown spectroscopy (LIBS) as a new in situ chemical sensing technique for the deep ocean
… environment is becoming increasingly important. Laser-induced breakdown spectroscopy (LIBS) possesses many of the characteristics required for such in situ chemical sensing, and is a promising technique for field measurements in extreme environments. Although many LIBS researchers have focused …
-
Heat Transfer and Combustion Characteristics of Nano-Sized Aluminum and Aluminum Oxide Utilizing Advanced Laser and Optical Diagnostics
… utilizing a two-colored time-resolved Laser-Induced Incandescence technique (TiRe-LII). The model’s validity was confirmed by comparing it with data from existing literature. This model serves as a reliable foundation for measuring the accommodation coefficient in future studies …
-
Laboratory evaluation of laser-induced breakdown spectroscopy (LIBS) as a new in situ chemical sensing technique for the deep ocean
… environment is becoming increasingly important. Laser-induced breakdown spectroscopy (LIBS) possesses many of the characteristics required for such in situ chemical sensing, and is a promising technique for field measurements in extreme environments. Although many LIBS researchers have focused …
-
Microwave Triggered Laser Ionization of Air
… power electromagnetic wave interaction with a laser-induced plasma (LIP) have been investigated. The laser-induced breakdown processes in air generated by focusing a 600 mJ, 7 ns pulselength, 1064 nm wavelength Nd:YAG laser onto a 30 μm spot size at an atmospheric pressure of 631 Torr are …
-
Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
A pulsed laser-induced plasma (LIP) was generated in ambient air inside a high-finesse near-concentric optical cavity. The broadband optical plasma emission was successfully sustained within the cavity and the light leaking from the cavity was used to measure broadband absorption spectra of gaseous …
-
Two Innovative Applications Combining Fiber Optics and High Power Pulsed Laser: Active Ultrasonic Based Structural Health Monitoring and Guided Laser Micromachining
… optics techniques involving high power pulse laser delivery. The first research topic is "Embedded Active Fiber Optic Sensing Network for Structural Health Monitoring in Harsh Environments", which uses the fiber delivered pulse laser for acoustic generation. The second research topic is "Fiber …
-
Microwave Beam Diagnostic of Laser-Induced Plasmas
… the use of micro-impulse radar to detect laser-induced plasmas. The MIR actively interrogates the plasma to produce a reflected microwave signal from the plasma, and the device also detects the acoustic signature of the plasma. The acoustic MIR signal is similar to the signal received by a …
-
Fundamental physics and application of plasma actuators for high-speed flows
… detailed investigation is given discussing three plasma-based flow control methods. These methods included plasma generated by laser energy, microwaves, and electric arc. The plasma generated by laser energy was also applied to a sonic transverse jet in a supersonic cross flow. Lastly, the …