METHOD OF DETERMINING DEGREE OF POLYMERIZATION OF COMPOSITE MATERIALS Russian patent published in 2006 - IPC G01N29/00 

FIELD: determination of degree of polymerization of composite materials.

SUBSTANCE: method can be used for determining degree of polymerization of composite material in items and structures with non-stable characteristics of surface of objects. Pulses of longitudinal acoustic waves -probing pulse, bottom pulse and pulses dissipated by structure in reverse direction - are excited and received in inspected material by means of laser optic-acoustic converter from the same surface. Spectrum of pulse dissipated by structure of material in reverse direction and spectrum of probing pulse are measured. Value of standardized power of structural noise is determined on the base of measurement of spectra mentioned above. Spectral analysis of bottom pulse is carried out by means of Fourier transform and spectrum of bottom pulse is determined. The spectrum is used for measuring frequency of main high-frequency spectral component of bottom pulse. Polymerization degree β of composite material is determined from the following correlation relation: β=φ(f_mhfc, w), where f_mnhfc is frequency of main high-frequency component of spectrum of ultrasonic oscillation bottom pulse, w is value of standardized power of structural noise.

EFFECT: improved precision; improved truth of results.

1 dwg