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Micron Level High Precision AprilGrid Calibration Board QR Code Calibration Board with Customizable Size and Non-Reflective Surface
QR Code Calibration Board
,AprilGrid Calibration Board
,Calibration Board Customizable Size
The AprilGrid Calibration Board features the AprilTag grid pattern for accurate camera calibration, lens distortion correction, and parameter estimation. The included bracket ensures stable mounting, making it ideal for industrial and robotic applications, with customizable sizes suitable for both indoor and outdoor use.
- Micron-level high precision — maximum accuracy of up to 1 µm
- High contrast for clear and easy identification
- Non-reflective surface for reliable imaging
- Multi-format drawing customization supported
Machine vision calibration for security, film and television, medical, camera, drone camera, photography studio, scientific research instruments, and other equipment.
The substrate for the QR code calibration plate is optional. Different substrates — such as glass, ceramic, and aluminum plate — can be customized according to different usage scenarios, environments, and accuracy requirements.
| Design | Specification | Substrate | Specification |
|---|---|---|---|
| Manufacturing Process | Photolithography | Glass substrate | Quartz glass (fused silica) / soda glass |
| Minimum line width | 1 µm / 0.55 µm | Transmittance rate (@550 nm) | >95% |
| Feature accuracy | ±1 µm | Coefficient of thermal expansion (20–200 °C) | <5.0×10⁻⁷/K |
| Coating | Yellow chromium, bright chromium, blue chromium (low reflectivity) | Expansion ratio (20–200 °C) | 0.00006% (0.6 µm/°C of 1 m) |
| Reflectance | <13.4% @550 nm <1.8% @650 nm <2.67% @750 nm |
Surface flatness | <0.55 µm (length <50 mm) <2 µm (length <100 mm) <5 µm (length >100 mm) |
| Coating accuracy | 120 nm (±0.20 nm) | Surface roughness | <0.025 µm |
| Optical density OD | Yellow chromium 3 (blue 5) | Thickness | 1 mm, 1.6 mm, 2.3 mm, 3 mm (±0.2 mm) (500×500×4.8) |
| White background | Minimum line width: 10 µm White background thickness: 40 µm (smooth white coating on the back) |
Minimum / maximum size | Min: 2×2 mm Max: 800×960 mm (±0.1 mm) |
| Positive & negative shapes | Positive: pattern opaque Negative: pattern translucent |
Appearance and shape | Square |
| Design | Specification | Substrate | Specification |
|---|---|---|---|
| Manufacturing Process | Photolithography | Type | Matte chromium on matte ceramics / bright chrome on glossy ceramics |
| Type | Matte ceramic / glossy ceramic | Ceramic substrate | Zirconia / alumina |
| Minimum line width | 4 µm (matte) / 2 µm (glossy) | Thickness | 1 mm (±0.1 mm, common) / 2 mm (common) / 3 mm (±0.1 mm) |
| Feature accuracy | ±2 µm | Surface flatness | <30 µm (length <100 mm) <60 µm (length <200 mm) |
| Appearance accuracy | ±0.05 mm | Size range | Min: 2×2 mm (±0.1 mm) Max: 228×228 mm (±0.1 mm) |
| Coating | Chromium | Surface roughness | <0.2–0.7 µm |
| Light / matte coating | Matte chromium coating / bright chrome coating | Coefficient of thermal expansion (40–400 °C) | <6.7×10⁻⁶/K |
| Reflectance | <12.88% @550 nm <10.62% @650 nm <12.23% @750 nm (glossy: <9.56% @550 nm, <1.89% @650 nm, <11.168% @750 nm) |
Unit weight | ≥3.66 g/cm³ |
| Coating thickness | 100–120 nm | Rockwell hardness | ≥80 HRA |
| Positive and negative shapes | Positive film: opaque pattern Negative film: transparent pattern |
Appearance and shape | Laser cutting of any shape: square, ellipse |
| Protective layer | The thin film above the chromium layer makes the chromium pattern more durable | Special shape | Punch, chamfer, oblique angle |
| Design | Specification | Film Substrate | Specification |
|---|---|---|---|
| Manufacturing Process | Lithography (film lithography machine) | Application | Used for transmission / backlight / functional testing |
| Minimum line width | 10 µm / 30 µm optional | Coefficient of expansion | Film shrinks when heated and expands when cooled |
| Feature accuracy | ±10 µm | Dimensional stability | 10 µm/°C of 1 m; when relative temperature is constant and humidity changes by 1 °C, a film of 1 m length changes by 10 µm (one ten-thousandth) |
| Coating | Silver bromide | Transmittance rate (400–700 nm) | >90%; ultraviolet <(400–700 nm)> infrared |
| Coating thickness | 2 µm | Film substrate thickness | 0.18 mm (±0.01 mm) |
| Optical density OD | OD>4 when 100% black (OD value controllable in grayscale) | Maximum size | 0.71×0.81 m (±0.1 mm) (minimum line width 10 µm) 1.68×3.5 m (±0.1 mm) (minimum line width 30 µm) |
| Color | Black grayscale, sine grayscale | Appearance | Laser cutting, straight edge cutting, and circular hole hollowing are available |
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