scholarly journals Dynamics of explosive vaporization in metastable liquids under pulsed heating

2018 ◽  
Author(s):  
Igor Kozulin ◽  
Vladimir Kuznetsov
Keyword(s):  
Pulsed Heating ◽  
Explosive Vaporization

Pulsed Heating of Carbides

2018 ◽  
Vol 82 (4) ◽  
pp. 363-368 ◽  
Author(s):  
A. I. Savvatimskiy ◽  
S. V. Onufriev ◽  
S. A. Muboyajan ◽  
P. A. Tsygankov
Keyword(s):  
Pulsed Heating

Explosive vaporization of a water layer on a flat microheater

2010 ◽  
Vol 19 (2) ◽  
pp. 102-109 ◽  
Author(s):  
V. V. Kuznetsov ◽  
I. A. Kozulin
Keyword(s):  
Water Layer ◽  
Explosive Vaporization

Towards temperature controlled retinal laser treatment with a single laser at 10 kHz repetition rate

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mario Mordmüller ◽  
Viktoria Kleyman ◽  
Manuel Schaller ◽  
Mitsuru Wilson ◽  
Dirk Theisen-Kunde ◽  
...  
Keyword(s):  
Temperature Measurement ◽  
Laser Treatment ◽  
Repetition Rate ◽  
Continuous Wave ◽  
Cell Damage ◽  
Pulsed Laser ◽  
Extended Kalman Filtering ◽  
Tissue Heating ◽  
Pulsed Heating ◽  
Measurement And Control

Abstract Laser photocoagulation is one of the most frequently used treatment approaches in ophthalmology for a variety of retinal diseases. Depending on indication, treatment intensity varies from application of specific micro injuries down to gentle temperature increases without inducing cell damage. Especially for the latter, proper energy dosing is still a challenging issue, which mostly relies on the physician’s experience. Pulsed laser photoacoustic temperature measurement has already proven its ability for automated irradiation control during laser treatment but suffers from a comparatively high instrumental effort due to combination with a conventional continuous wave treatment laser. In this paper, a simplified setup with a single pulsed laser at 10 kHz repetition rate is presented. The setup combines the instrumentation for treatment as well as temperature measurement and control in a single device. In order to compare the solely pulsed heating with continuous wave (cw) tissue heating, pulse energies of 4 µJ were applied with a repetition rate of 1 kHz to probe the temperature rise, respectively. With the same average laser power of 60 mW an almost identical temporal temperature course was retrieved in both irradiation modes as expected. The ability to reach and maintain a chosen aim temperature of 41 °C is demonstrated by means of model predictive control (MPC) and extended Kalman filtering at a the measurement rate of 250 Hz with an accuracy of less than ±0.1 °C. A major advantage of optimization-based control techniques like MPC is their capability of rigorously ensuring constraints, e.g., temperature limits, and thus, realizing a more reliable and secure temperature control during retinal laser irradiation.

Analysis of Nanosecond Explosive Vaporization Process by Photothermal/Photoacoustic Methods

2003 ◽  
Vol 27 (6) ◽  
pp. 804-812
Author(s):  
Hee-K. Park ◽  
Costas P. Grigoropoulos ◽  
Sun R. Choi ◽  
Dong-Sik Kim
Keyword(s):  
Vaporization Process ◽  
Explosive Vaporization

Dynamic observation of X-ray Laue diffraction on single-crystal tungsten during pulsed heat load

2019 ◽  
Vol 26 (5) ◽  
pp. 1644-1649 ◽  
Author(s):  
Aleksey S. Arakcheev ◽  
Vladimir M. Aulchenko ◽  
Ilya I. Balash ◽  
Aleksandr V. Burdakov ◽  
Aleksandr D. Chernyakin ◽  
...  
Keyword(s):  
Single Crystal ◽  
Nuclear Physics ◽  
Heat Load ◽  
Diffraction Peak ◽  
Budker Institute ◽  
Peak Shape ◽  
Pulsed Heating ◽  
Dynamic Observation ◽  
Theoretical Predictions ◽  
Residual Plastic Deformation

The dynamics of the diffraction peak shape during pulsed heat load on mosaic single-crystal tungsten were measured at the `Plasma' scattering station on the eighth beamline of the VEPP-4 synchrotron radiation source at the Budker Institute of Nuclear Physics. The observed evolution of the diffraction peak shape agrees with theoretical predictions based on calculations of deformation caused by pulsed heating. Three clearly distinguishable stages of the diffraction-peak evolution were found, correlating with the evolution of temperature and deformation distributions. The residual plastic deformation increased with subsequent heating pulses.

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