3 edition of Measurement of heat pump processes induced by laser radiation found in the catalog.
Measurement of heat pump processes induced by laser radiation
by National Aeronautics and Space Administration, Lewis Research Center in Cleveland, OH
Written in English
|Statement||[M. Garbuny and T. Henningsen].|
|Series||NASA CR -- 168324., NASA contractor report -- NASA CR-168324.|
|Contributions||Henningsen, T., Lewis Research Center., Westinghouse Electric Corporation. Research & Development Center.|
|The Physical Object|
Heat Transfer and Radiation Exchange Basics graphy is based on the measurement of radiative heat flow and is therefore most closely related to the radiation mode of heat transfer. Conduction Basics of Noncontact Thermal Measurements In most cases, thermal imagers can be considered as extensions of radiation. Effect of laser radiation intensity and exposure time on photothermal therapy using nanoparticles heated by radiation of a diode laser at λ = nm, and optical clearing of biological tissues.
'heat' is a rather arcane term to use as a form of interchangeable energy. Excess heat only causes more phonons ('acoustic' vibrations of the lattice), in which case you dissipate more energy for intermediate stages. For a rather silly, but impor. This can be confusing. The radiation from a laser can raise the temperatures of things that absorb it, and common usage would call this “heating.” But heat as the transfer of energy between two systems as a result of a temperature difference requi.
The changes induced by temperature in the refractive index of water were monitored by Celliers et al. 8, who measured a 4 °C temperature increase in . At first, we summarize the properties of a transverse electromagnetic wave. This is followed by the discussion of the diffraction of light. We present the concept of coherence—temporal and spatial—and compare laser radiation with thermal light. After that, we treat the Gaussian beam and the higher transverse modes.
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Measurement of heat pump processes induced by laser radiation. Cleveland, Ohio: National Aeronautics and Space Administration, NASA Lewis Research Center, November (OCoLC) Measurement of heat pump processes induced by laser radiation: Authors: Garbuny, M.; Henningsen, T.
Affiliation: and it is expected that increase of pulse energies and durations will enhance the heat pump effects. The experiments confirm the feasibility of quasi-isentropic engines which convert laser power into work without the need for. Measurement of heat pump processes induced by laser radiation.
Cleveland, OH: National Aeronautics and Space Administration, Lewis Research Center,  (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors.
Effects of High-Power Laser Radiation describes the interactions between high-power laser beams and matter. This book is divided into eight chapters that particularly focus on interactions such as heating, melting, vaporization, and plasma production.
George Wypych, in PVC Degradation and Stabilization (Third Edition), LASER. Laser radiation has been studied for two purposes: development of knowledge on thermal degradation processes and deposition of various substances on the surface of polymer film.
17–22 The wavelength of radiation can be selected but it is usually chosen to be or nm. This book is the first to describe novel measurement techniques of processes during laser-matter interaction using ultra-fast lasers. Targeted at both engineers and physicists, initial chapters address the working tools, the history of laser ultra-fast metrology, an overview of ultra-fast laser sources, and the fundamentals of laser radiation-matter interaction.
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic term "laser" originated as an acronym for "light amplification by stimulated emission of radiation". The first laser was built in by Theodore H.
Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur. Chapter Radiation Heat Transfer Radiation differs from Conduction and Convection heat t transfer mechanisms, in the sense that it does not require the presence of a material medium to occur.
Energy transfer by radiation occurs at the speed of light and suffers no attenuation in vacuum. Laser safety is the safe design, use and implementation of lasers to minimize the risk of laser accidents, especially those involving eye injuries.
Since even relatively small amounts of laser light can lead to permanent eye injuries, the sale and usage of lasers is typically subject to government regulations. Purchase Effects of High-Power Laser Radiation - 1st Edition.
Print Book & E-Book. ISBNbe λ SSL ≈ × 10–6 m, the photon energies amount to E Ph,CO 2 = × 10–20 J for CO 2 laser radiation and E Ph,SSL = × 10–19 J for solid-state laser radiation.
Using Einstein’s formula of mass-energy equivalence, the (equivalent) photon masses m Ph,L can be calculated again as a function of laser wavelength according to.
4 1 Lasers: Fundamentals, Types, and Operations N N E 0 E E 1 E 3 E 0 E E 1 2 Fast decay Fast decay Fast decay Pumping Pumping Lasing Lasing (a) (b) Figure Energy level diagram for (a) three- and (b) four level laser systems.
N 1 to achieve the condition of population inversion between E 2 and E 1 at moderate pumping. Threshold Gain Coefﬁcient for Lasing Laser beam undergoes. Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase ers also consider the transfer of mass of differing chemical species.
We performed temperature measurements at the rear surface of laser-irradiated targets under conditions of two different laser wavelengths ( or μ m) and several intensities (2 × 10 13 – 1 × 10 14 W / cm 2) in order to verify an effect of radiation and nonlocal electron heat transport. 1 EFFECT OF LASER INTENSITY AND DYNAMICS OF PLASMA ON LASER INDUCED BREAKDOWN SPECTROSCOPY V.
Rai1 and Jagdish P. Singh2, 3 1Raja Ramanna Centre for Advanced Technology Indore (INDIA) [email protected] 2Institute for. The measurement of heat loss with use of a thermal imaging system 1: Temperature distribution field at front side of the combustion device II: Calculated results of heat loss Mc Adams C.
King F. Michejev Heat losses due to convection [Wm−2] 85 Heat loss due to radiation [Wm−2] Total heat loss [Wm−2] Total heat loss for a surface [W] Laser Radiation Properties II.
Laser radiation has high brightness, a quantity defined as the power emitted per unit surface area per unit solid angle. Because laser light is emitted as a narrow beam with small divergence, the brightness of a 1 mW laser pointer, for example, is > 1, × ’s greater than that of the sun, which emits more than 10 25 W of radiant power a.
of 10 - 12 mm with diode-laser radiation. The bulk properties of the torsion springs are retained. The process is used in 3-shift operation to produce around eight million springs a year. Softening Heat treatment using laser radiation can also be used for spe-cific softening, e.g.
of. The main reasons why a laser is beneficial for this type of heat treatment are the ability to control the illumination on a localized area (and in turn the degree of heat on the metal), it being a rapid processing technique, the precise control over penetration depth, precise control over the degree of hardening of the metal, and minimal.
different excited states, free electrons and radiation. Un- der the basic assumption that the emitted radiation is in- fluenced by the properties of the plasma, hence, it gives a detailed picture of the basic structure elements  and different processes in the plasma .
The diagnostics of the plasma can be done through the measurements of the. Heating and Melting Model Induced by Laser Beam in Solid Material simulate the laser processes on the depth of the solid material using the commercial code ANSYS (9). The geometry of the structure, shown in Fig surface and subjected to convection and radiation heat losses.
A laser power P is assumed to have a.In this process the laser is used to heat the surface of materials. Any subsurface heating is accomplished by conduction. For intensity values up to about 1x10 4 W/cm 2, the absorbed power depends on the wavelength (λ), the material (and its surface condition).Generally, as the material temperature increases, so does the absorption of laser light.Study of Thermal Effects Induced by Laser Radiation Incident in an Amplifier: (I) Linear Case A.
F. Hasssan, M. M. El-Nicklawy, S. L. Diab, S. El-Din Salman and A. M Abd-Rabou Helwan University, Faculty of Science, Physics department The present work aims to study the temperature distribution in .