SL8 Checkerboard Multi Array Distortion Target

PURPOSE

Checkerboard arrays are widely used to evaluate the Modulation Transfer Function (MTF) of camera lenses and to analyse the sharpness, distortion, and geometric accuracy of machine vision and optical imaging systems. These targets are especially effective for calibrating stereo vision setups, rectifying perspective distortion, and verifying resolution consistency across the field of view. The square grid layout allows for algorithmic feature detection and repeatable system alignment in both laboratory and production environments.

CONFIGURATION

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

PATTERN DESCRIPTION

The pattern consists of high-precision checkerboard arrays drawn at multiple square sizes. Each array is positioned within its own defined region on the slide. The following square sizes and pattern areas are included:

500Grid: 500 µm squares, 30 × 30 mm pattern area
250Grid: 250 µm squares, 25 × 25 mm pattern area
100Grid: 100 µm squares, 20 × 20 mm pattern area
50Grid:  50 µm squares, 15 × 15 mm pattern area
25Grid:  25 µm squares, 10 × 10 mm pattern area

Low-resolution PDF previews of the pattern are available for download in the DOWNLOAD tab.

MATERIAL

Soda Lime Glass is the most common substrate for optical targets due to its low cost, excellent flatness, and reliable optical performance. It provides high UV transparency from 350 nm and offers a thermal expansion coefficient of 93 × 10⁻⁷ (~10 ppm), with 88% transmittance in the 375–750 nm range. Flatness class: 5 µm.

White Diffuser Glass is a semi-opaque, double-side polished soda lime glass that provides uniform light diffusion with ~30% transmission. Its solid diffusive composition allows it to function in any orientation, with near-Lambertian transmission and slight specular reflection. Ideal for even illumination or as a viewing screen. Flatness class: 2 µm.

Anti-glare spray coatings are available to reduce surface reflection under reflected light setups.

TURNAROUND

Standard production turnaround is 3 working days from receipt of order. Expedited service is available on request 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: One square width and one pitch per grid size are measured and documented. Tolerances follow our standard specifications.

Please see the TECHNICAL, DOWNLOAD, and FAQ sections for further information. If you still require clarification, please either email or click for LIVE SUPPORT.