T-R1L1S2P - Positive Sector Star Test Target, 1" x 1", 36 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 36 Over 360°
• Resolution at Outer Diameter 1.15 lp/mm
• Resolution at Center Circle 57.5 lp/mm

The T-R1L1S2P target has 36 bars over 360°. The resolution at the center circle of this target is 57.5 lp/mm. Alternatively, the R1L1S3P target has 72 bars over 360°, and the resolution at the center is 115 lp/mm. Both targets also have a Ø200 µm center circle and are useful for determining the resolution of an optical system by noting how close to the center of the pattern an optical system is able to resolve adjacent bars. 

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. R1L1S2P IS A POSITIVE TEST TARGET WITH DARK PATTERN AND CLEAR BACKGROUND

HBB8. PATTERN SIZE: WEDGE SHAPED SEGMENT WITH 36 EQUAL BAR AND SPACE WIDTHS (10 DEGREES PER CYCLE OR 5 DEGREES PER SPOKE) OVER A 360 DEGREES CIRCUMFERENCE CIRCLE. OVERALL IMAGE SIZE 10mm DIAMETER. THE SMALLEST RESOLVED GRATING PITCH AT THE CENTER