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Investigation of the influence exerted on a solid by luminous radiation from a source of the explosive type

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Abstract

This article presents a qualitative description and analysis of various hydrodynamic and physical phenomena taking place when a solid surface is exposed to a long-term action of a sufficiently intense light flux.

The necessity of experimental studies of these phenomena is demonstrated by showing the complexity of the processes of heating and motion of a vaporized substance and the difficulty of producing an accurate description of the phenomena in question in the absence of certain essential data.

It is postulated that more powerful explosive sources, producing fluxes of 106 joules/cm2 sec should be used as luminous radiation sources. Data is reported which were obtained by experiments using a source of this kind; the source generated a radiation pulse of 30 μsec whose spectrum corresponded to a temperature of 3 · 104° K. These experiments proved the feasibility of using explosive sources in studies of the volatilization and heating of vapors under “quiet” conditions. High-speed motion pictures were taken of the luminescent zone produced at an irradiated surface, and the speed at which the boundary of this zone moves (200–500 m/sec) was measured. The luminescent zone was shown to be formed by vapors of the irradiated material. When luminescence was observed, an increase in pressure (up to several kg/cm2) at the irradiated surface was recorded; this effect was attributed to the recoil action of vapors moving away from a boiling or subliming material surface. A time lag in the onset of volatilization was observed and attributed to the influence of the heat conduction in the material and to the reflection of a part of the incident radiation.

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Zharikov, I.F., Nemchinov, I.V. & Tsikulin, M.A. Investigation of the influence exerted on a solid by luminous radiation from a source of the explosive type. J Appl Mech Tech Phys 8, 20–28 (1967). https://doi.org/10.1007/BF00913237

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Keywords

  • Explosive
  • Incident Radiation
  • Accurate Description
  • Radiation Pulse
  • Motion Picture