Heating Methods and Detection Limits for Infrared Thermography Inspection of Fiber-Reinforced Polymer Composites
Hayley A. Hamilton
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Semantic Scholar extracted view of "Heating Methods and Detection Limits for Infrared Thermography Inspection of Fiber-Reinforced Polymer Composites" by Jeff Brown et al.
15 Figures and Tables
Table 1—Material properties
Fig. 1—Defect configuration for Series A specimens.
Table 2—Series A details
Fig. 2—Heat source and camera configurations: (a) flash heating (plan view); (b) scan heating; (c) long-pulse heating (plan view); and (d) long-pulse heating (profile view).
Table 3—Surface temperature increase results for different heating methods
Fig. 4—Area identification for defect analysis (Defect A75, Specimen A-1). Thermal image and corresponding surface plot for properly defined defect area.
Table 4—Actual and measured areas for select defects (60-second pulse heating)
Fig. 5—Constructing ΔTdef versus time plots from area parameters. Defect A75, Specimen A-1 (flash heating): (a) Tmax and Tper_avg versus time; and (b) Δ Tdef versus time.
Table 5—General detectability results for flash heating
Fig. 6—Thermal images for Defect IB (Specimen A-3): (a) t = 0 s; (b) t = tb (t = 12 s); and (c) t = tmax (t = 40 s).
Fig. 8—Comparison of ΔTmax for different heating methods: (a) Specimen A-1; (b) Specimen A-2; (c) Specimen A-3; and (d) Specimen A-4.
Fig. 9—Comparison of normalized ΔTmax for different heating methods: (a) Specimen A-1; (b) Specimen A-2; (c) Specimen A-3; and (d) Specimen A-4.
Fig. 10—Reduced accuracy in area computations due to: (a) weak signal; (b) nonuniform heating; and (c) insufficient pixel resolution.
Fig. 11—Area computations for Defect A75: (a) boundary trace method; (b) gradient area method; (c) surface temperature profile; and (d) temperature gradient profile.
Fig. 12—Maximum signal versus radii COV for all detected defects.
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