Precision Fibre Angle Inspection for Carbon Fibre Composite Structures Using Polarisation Vision
Round 1
Reviewer 1 Report
This paper demonstrated the capabilities and limitations of polarization imaging technology as applied to CFRP component inspection. Specifically, it evaluated the precision of polarization imaging technology for the inspection of carbon fibre composite components, such as fibre orientation measurements based on the premise that light is polarised by reflection from this anisotropically conductive surfaces. Not only less than one degree of average relative angle could be achieved for best cases using polarization imaging technology, but also it can be embedded into an existing production line for practical application. Although inspection precision should be improved and full-scale inspection of three-dimensional parts need to be developed in the future, it is recommended to accept for publishing after minor revision.
Suggestion(minor revision):
1) describe/elaborate advantage of composite structure over conventional materials within one to two sentences after line 18-19 in Introduction of Page 1.
2) before line 119 of section 1.1.2 Polarisation Vision Hardware, make a table/list to summarize and compare 'Composite Part Inspection' methods decribed in line 67-98 and polarisation vision clearly, especailly showing shortcomings of other methods.
Author Response
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Author Response File: 
Author Response.docx
Reviewer 2 Report
The paper presents the inspection of fibre angle for carbon composite plates and tubes. the topic is very interesting and relevant for industrial applications to composite manufacturing.
Overall the paper is well written and the findings are clearly presented.
Angle measurements are presented as averaged results (medians) for various ROIs within each image. I would also add some information about minimum spatial resolution of the measurements.
Furthermore, I would like to read some information about the actual variance of fiber angle in the UD cloth; this would allow to separate the variance due to the measurement method from the intrinsic variance of the fiber direction.
Author Response
Please see the attachment
Author Response File: 
Author Response.pdf
