SL1 Grid Test Target

PURPOSE

Grid arrays are used to evaluate distortion in imaging systems. Ideally, the horizontal and vertical lines should remain perfectly perpendicular; any deviation—such as bowing—indicates distortion. These patterns enable software-based correction of lens and sensor distortions. While primarily intended for distortion measurement, the grids are also suitable for calibration, alignment, magnification scaling, focus evaluation, and general image system benchmarking.

CONFIGURATION

• Material: Chrome on Transparent Soda Lime Glass, 1.5 mm thick, available in 3" (75 mm)
• Material: Chrome on White Glass, 1.25 mm thick, available in 4" (100 mm)

PATTERN DESCRIPTION

The pattern consists of multiple grid arrays defined by centre-to-centre line spacing. The following pitch values are included: 1000 µm, 500 µm, 100 µm, 50 µm, 25 µm, and—on the high-resolution version—10 µm.

1000 Grid: 200 µm line, pattern area 30 × 30 mm
500 Grid: 100 µm line, pattern area 25 × 25 mm
100 Grid: 20 µm line, pattern area 20 × 20 mm
50 Grid: 10 µm line, pattern area 15 × 15 mm
25 Grid: 5 µm line, pattern area 10 × 10 mm
10 Grid: 2 µm line, pattern area 5 × 5 mm (HIGH RESOLUTION SLIDE ONLY)

Low-resolution PDF previews of these patterns are available under the DOWNLOAD tab.

MATERIAL

Soda Lime Glass is widely used for test targets due to its balance of optical performance and cost. It offers good surface quality and flatness, with high transmittance from 350 nm upwards. The thermal expansion coefficient is 93 × 10⁻⁷/°C (~10 ppm), and the transmission is 88% across 375–750 nm. Flatness class: 5 µm.

White Diffuser Glass is a semi-opaque soda lime glass with integrated diffusion properties. Unlike coated or laminated alternatives, this is a solid diffuse medium with ~30% transmission, suitable for all orientations. The surfaces are polished to allow near-Lambertian light transmission with some specular reflection. Common applications include uniform illumination, attenuation, and viewing screens. Flatness class: 2 µm (double-sided polished).

Anti-glare spray coatings can be applied on request to reduce surface reflectivity under reflected lighting conditions.

TURNAROUND

Standard production time is 3 working days from receipt of order. Expedited services are available for urgent requirements.

INSPECTION

All photomasks undergo a comprehensive inspection process. Key parameters such as Critical Dimension (CD) and feature uniformity are measured and recorded. High-magnification images (Nikon MM40 at 900×, OGP ZIP 300 at 400×) are stored with production data. For sectors requiring compliance documentation—such as medical or automotive—optional inspection certificates can be included with the order.

Standard: Full inspection performed; no documentation supplied.

Certificate of Conformance: Confirms compliance with internal inspection standards.

Certificate of Measurement: Verifies up to 10 user-specified dimensions within stated tolerances. CAD or marked drawing required. Additional measurements available upon request.

Please refer to the TECHNICAL, DOWNLOAD, and FAQ sections for further information. For assistance, contact us via email or LIVE SUPPORT.