HOU Jing, WANG Hongxiang, WANG Chu, et al. Nondestructive fluorescence detection method for subsurface damage depth of optics[J]. 2018, 50(7): 17-22.DOI: 10.11918/j.issn.0367-6234.201707091.
A nondestructive detection method of subsurface damage depth was proposed
in which nano-fluorescent quantum dots were added as marker in grinding and polishing process
and the quantum dots were excited by light and produced fluorescence
then the slice images of the samples at different depths were obtained by laser confocal microscopy. When the scanning depth reached a certain value
the fluorescence intensity became weak and the subsurface damage depth was determined by fluorescence intensity change of the feature points. A nondestructive detection software of subsurface damage depth
which has functions of image threshold processing
bright spot automatic recognition
image display and curve characterization
is developed and it can realize the rapid detection of subsurface damage depth. The results of non-destructive detection and damage detection were compared
and it showed that the relative error between the two detection methods was less than 10%
which verified the effectiveness of the proposed method.