METHOD OF DETERMINING CHARACTERISTICS OF IGNITION OF SAMPLES OF HIGH-ENERGY MATERIALS BY LASER RADIATION Russian patent published in 2020 - IPC G01N21/39 G01N25/50 

FIELD: measurement.

SUBSTANCE: invention relates to investigation of characteristics of high-energy materials (HEM), in particular to determination of HEM ignition delay time by laser radiation. Method of determining characteristics of ignition of samples of high-energy materials by laser radiation involves measuring ignition delay time when continuous laser radiation is supplied to the sample surface, characterized in that the analyzed sample in form of a right circular cylinder is pre-pressed into a cylindrical tube made of transparent material, the diameter of the laser beam is expanded by means of a telescopic system to the diameter of the sample, before the laser radiation is supplied to the end surface of the sample, the sample is rotated about its axis of symmetry at a constant angular velocity, and the height of the tube above the irradiated surface of the sample and the angular velocity of rotation of the sample are determined in accordance with the relationships: h≥3d,

where h is tube height above sample irradiated surface, m; d is sample diameter, m; n is angular rotation speed of the sample, rev/s; W is laser radiation power, W; S is area of sample end surface, m²; ΔT_* - specified value of sample surface non-uniformity, K; m is the number of radiation modes in the cross-section of the laser beam; λ is sample material heat conductivity coefficient, W/(m⋅K); ρ is sample material density, kg/m³; c is specific capacity of sample material, J/(kg⋅K).

EFFECT: possibility of determining HEM ignition delay time with uniform distribution of heat flux density over sample surface.

1 cl, 7 dwg, 2 tbl