Inductive discharge pulse driver in time gated laser ranging (Conference Presentation)

RF inductor power losses of ferrite-free electrode-less low pressure mercury inductively-coupled discharges excited in closed-loop dielectric tube were studied. The modelling was made within the framework of low pressure inductive discharge transformer model for discharge lamps with tubes of 16, 25 and 38 mm inner diam. filled with the mixture of mercury vapour (7.5×10–3 mm Hg) and argon (0.1, 0.3 and 1.0 mm Hg) at RF frequencies of 1, 7; 3.4 and 5.1 MHz and plasma power of (25–500) W. Discharges were excited with the help of the induction coil of 3, 4 and 6 turns placed along the inner perimeter of the closed-loop tube. It was found that the dependence of coil power losses, Pcoil, on the discharge plasma power, Ppl, had the minimum while Pcoil decreased with RF frequency, tube diameter and coil number of turns. The modelling results were found in good qualitative agreement with the experimental data; quantitative discrepancies are believed to be due skin-effect and RF electric field radial inhomogeneity that were not included in discharge modelling.

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Current state of high-accuracy laser ranging

Uspekhi Fizicheskih Nauk ◽

10.3367/ufnr.2017.04.038147 ◽

2017 ◽

Vol 188 (07) ◽

Author(s):

Vladimir P. Vasiliev

Keyword(s):

High Accuracy ◽

Laser Ranging ◽

Current State

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Excitation of coaxial copper vapor lasers by a pulse-periodical inductive discharge

Оптика атмосферы и океана ◽

10.15372/aoo20160205 ◽

2016 ◽

Vol 29 (2) ◽

Cited By ~ 1

Keyword(s):

Inductive Discharge ◽

Copper Vapor ◽

Copper Vapor Lasers

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Discharge-pulse Geotechnical Electro Discharge Technology of Bases Strengthening

Stroitel nye Materialy ◽

10.31659/0585-430x-2020-787-12-63-65 ◽

2020 ◽

Vol 787 (12) ◽

pp. 63-65

Author(s):

N.S. Sokolov

Keyword(s):

Bearing Capacity ◽

Mechanical Characteristics ◽

Discharge Pulse ◽

Zero Values ◽

Traditional Technologies ◽

Negative Friction ◽

Geotechnical Problems ◽

Physical And Mechanical Characteristics

The problem of increasing the bearing capacity of the base is an relevant problem in modern geotechnical construction. When significant loads are transmitted to the base, the use of traditional technologies is not always justified. Often there is an urgent need to use non-standard ways to strengthen the bases. In many cases, the geotechnical situation is aggravated by the presence of weak underlying layers with unstable physical and mechanical characteristics in engineering-geological sections. When strengthening such bases with the help of traditional piles, the latter can get negative friction, which significantly reduces their bearing capacity on the ground, sometimes reaching zero values. This may lead to additional precipitations of the objects being constructed and constructed in the zone of geotechnical influence. The use of ERT piles in most cases successfully solves many complex geotechnical problems.

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