T-R1L1S3P - Positive Sector Star Test Target, 1" x 1", 72 Bars

• 1" x 1" (25.4 mm x 25.4 mm) Positive Sector Star Targets
• Determine Resolution of an Optical System
• Low-Reflectivity, Vacuum-Sputtered Chrome on Soda Lime Glass
• Pattern Low-Reflectivity Chrome
• Background Clear
• Surface Flatness ≤15 µm
• Chrome Optical Density ≥3.0 at 430 nm
• Pattern Outer Diameter 10 mm
• Center Circle Diameter 200 µm
• Number of Bars 72 Over 360°
• Resolution at Outer Diameter 2.30 lp/mm
• Resolution at Center Circle 115 lp/mm

NOTES/SPECIFICATIONS:

1. MATERIAL: SODA LIME

2. COATING: OD3 LOW-REFLECTIVITY CHROME

3. FACE DIMENSION TOLERANCE: 0.5 mm

4. THICKNESS TOLERANCE: 0.3 mm

5. SURFACE FLATNESS: ≤15 µm

6. OPTICAL DENSITY: ≥3.0 AT 430 nm

7. R1L1S3P IS A POSITIVE TEST TAGET WITH DARK PATTERN AND CLEAR BACKGROUND

8. PATTERN SIZE: WEDGE SHAPED SEGMENT WITH 72 EQUAL BAR AND SPACE WIDTHS (5 DEGREES PER CYCLE OR 2.5 DEGREES PER SPOKE) OVER A 360 DEGREES CIRCUMFERENCE CIRCLE. OVERALL IMAGE SIZE 10mm DIAMETER. THE SMALLEST RESOLVED GRATING PITCH AT THE CENTER