X-ray Image Unsharpness & Resolution Gauge

• Consists of duplex wire pairs with precisely equal diameters and spacing
• Materials:
  • D1–D3: Tungsten (W)
  • D4–D17: Platinum (Pt)
• Design:
  • Cast in transparent, dimensionally stable, durable plastic
  • Standard code and serial number are directly visible on the radiographic image
• Evaluation principle:
  • As unsharpness increases, the wires merge
  • The number of wire pairs that remain distinguishable determines system resolution

Standard versions

• D13 (Standard Resolution)
  • 13 wire pairs (D1 → D13)
• D15 (High Resolution)
  • 15 wire pairs (D1 → D15)
• D17 HR (Ultra High Resolution)
  • 17 wire pairs (D4 → D17)

Wire size range (reference)

• From ~800 µm → 20 µm
• Corresponding to:
  • Unsharpness
  • Spatial resolution (SRb)
  • Line pairs (lp/mm)

Applicable standards

• ISO 19232-5
• ASTM E2002
• EN 462-5
• ISO 17636-2 (weld DR)
• ASTM E2597 (DDA characterization)

• Image quality assessment:
  • Digital Radiography (DR)
  • Computed Radiography (CR)
  • Radioscopy
• Inspection of:
  • Detector systems (DDA)
  • Imaging plates
  • X-ray systems
• Determination of:
  • System resolution
  • Image blurring
  • Imaging system performance