USAF1951 Test Targets Blue Chrome on Quartz Glass for Machine Vision and Imaging System

Standard Item of USAF 1951 You Can Choose

USAF 1951 Specification

USAF 1951 Test Target Manufacturing: Step-by-Step Production Process

Minimum Line/space of USAF 1951

Low Reflectivity Quartz Glass of USAF 1951 Target

Key Insight:
Blue Chrome exhibits the lowest reflectivity in the 640-740 nm wavelength range, dropping to nearly 0% reflectivity

Note: Graph shows comparative reflectivity (%) of Bright Chrome, Brown Chrome, and Blue Chrome across 440-1040 nm wavelength range.

Positive / Negative of USAF 1951 Chart

Positive: Dark pattern on transparent background	Negative: Transparent pattern on dark background

Superior Light Transmission of USAF 1951 Test Target

Thermal Expansion Coeff 

Glass expands when heated and contracts when cooled

Note: Quartz glass offers approximately 14× greater dimensional stability under temperature changes

Surface Flatness Comparison of USAF 1951 Resolution Chart

Note: Quartz glass consistently delivers 5-10× better surface flatness across all size ranges, making it ideal for precision optical applications.

Ultra-Smooth Surface

Surface Roughness: Less than 25 nanometers

Note: Diagram shows microscopic surface profile with maximum height variations under 25nm

Our precision-polished quartz glass features an exceptionally smooth surface with microscopic variations of less than 0.025μm (25nm) - approximately 2,000 times thinner than a human hair.

Diagram shows microscopic surface profile with maximum height variations under 25nm

Precision Thickness Options

Available in multiple thicknesses to suit your application requirements

• 1.6mm - Ultra-thin for compact designs
•  2.3mm - Standard precision applications
• 3.0mm - Enhanced durability
• 4.8mm - Maximum stability for demanding environments

All options feature precision-ground edges and uniform thickness across the entire surface

Dimensional Range

From micro to macro - our quartz glass substrates are available in virtually any size you need:

• Maximum dimensions: 800×960mm
• Minimum dimensions: 4×4mm

Custom sizes and shapes available upon request

Density Measurement

Precision Laser Cutting Custom Shapes Made Easy

From simple to complex designs, our laser cutting technology delivers exactly what you need.

Corner | Chamfer | Hole | Round | Oval

Custom Services

Precision Backlighting for Glass Calibration Targets

Our backlighting system features:

• Large illumination area: 2.1 × 1.4 m
• Superior uniformity: 95%
• Dual-spectrum capability: IR and visible light
• High brightness output
• Ultra-slim profile

FAQ of 2/3 Inch Machine Vision Lens

1. What can the USAF 1951 test target measure?

The USAF 1951 target evaluates the resolving power of cameras, lenses, microscopes and complete imaging systems. Users identify the smallest line group that remains distinguishable. It does not directly measure lens distortion, color accuracy or absolute dimensional accuracy.

2. How are the group and element numbers on the USAF 1951 target converted into lp/mm?

Each numbered group contains six elements with progressively finer lines. For example, Group 0 Element 1 equals 1 lp/mm, while Group 9 Element 6 equals 912.3 lp/mm with a line width of approximately 0.55 μm. The smallest clearly separated element represents the system’s limiting resolution.

3. What is the difference between positive and negative USAF 1951 patterns?

A positive target has opaque chrome patterns on a transparent background. A negative target has transparent patterns on an opaque background. Choose the version that matches the system’s illumination direction, image polarity and detection method.

4. Which size and resolution range should be selected for a USAF 1951 target?

The standard sizes are 25 × 25 mm, 50 × 50 mm and 76 × 76 mm. The 25 mm and 50 mm versions cover Group 0 to Group 9, while the 76 mm version can extend from Group −2 to Group 9 for systems requiring both coarse and fine resolution features.

5. Why does this USAF 1951 target use blue chrome on quartz glass?

The quartz substrate provides over 95% transmission at 550 nm and a thermal expansion coefficient below (5.0 \times 10^{-7}/K). The low-reflective blue chrome coating has an optical density above 4.5, helping maintain stable contrast and dimensional accuracy during precision optical testing.

6. Can the USAF 1951 target be customized or supplied with independent certification?

Yes. The page offers custom dimensions from 4 × 4 mm to 800 × 960 mm, multiple thicknesses, custom shapes and extended pattern ranges. Single-piece orders and independent third-party certification are also available upon request.