| 摘要 |
PURPOSE:To perform measurement or local measurement in a high speed flow field by a method wherein a laser beam is allowed to be incident on a particle to allow the evaporated substance from the particle to emit a beam while the emitted beam is spectrally diffracted to obtain a spectrum which is, in turn, used in the measurement of the particle. CONSTITUTION:The laser beam 1 emitted from a laser beam oscillator 9 is once diffused by a concave lens 11 and subsequently condensed by a condensing optical system 14 containing convex lenses 12, 13. A specimen 7 is placed at the position where said condensed laser beam 1 is received. The beam 4 emitted from the plasma generated in the vicinity of the surface of the particle of the specimen 7 is condensed by a condenser 15 to be incident on a spectroscope 5 and spectrally diffracted by the spectroscope 5 to obtain monochromatic beam which is, in turn, photoelectrically converted by a photomultiplier 16 to be amplified by an amplifier 17 and, thereafter, the change of the intensity of the beam with the elapse of time is recorded by an oscilloscope 18. |
