Detection, 3-D positioning, and sizing of small pore defects using digital radiography and tracking

EURASIP Journal on Advances in Signal Processing

Table 1 Radiograph simulation parameters and noise factors

Grouping	Parameter	Unit	NF	Fixed at	NF low	NF high
Pores	Min interspacing	mm		0.35
	Count			8
	Positions	mm		Uniform random
	Min to max radius	mm
Weld	Plate thickness (T)	mm		5
	Width (B) DS	mm	Ψ_geo		12	5 ± 1
	Reinforcement (δ₀) DS	mm	Ψ_geo		1.5	0.75 ± 0.2
	Undercut (δ₁) DS	mm	Ψ_geo		0.5	0.75 ± 0.2
	Width (B) SS	mm	Ψ_geo		8	3 ± 0.4
	Reinforcement (δ₀) SS	mm	Ψ_geo		0.8	0.55 ± 0.2
	Undercut (δ₁) SS	mm	Ψ_geo		0.4	0.55 ± 0.2
Setup	SDD	mm		600
	ODD	mm		25
	Rotation angle (ω)	degrees		0,5,10,15,20,25
	Rotation point (R_x)	mm		567
X-ray	Attenuation	mm^-1		0.124
	D		Ψ_cnr		110	160
	S		Ψ_cnr		6,000	12,000
	PSF width (σ_det)	pixel	Ψ_det		0.93	0.93 ± 0.08

See Figure1 for details on weld and setup geometry. DS and SS refer to detector and source side, equivalent to face and root side. NF is shorthand for noise factor.