I. Industrial Inspection

      Optical targets, leveraging their precise markings and well-defined imaging characteristics, can be used to measure the dimensions of workpieces. For example, in precision mechanical machining, an optical target is placed near the workpiece. By using optical imaging equipment and specialized software to analyze the relative positional relationship between the target and the workpiece, dimensional data such as length, width, and height can be accurately obtained.

      Optical targets also enable the inspection of geometric tolerances of workpieces—such as flatness, straightness, and roundness. If form or position errors on the workpiece surface cause displacement or distortion in the target’s image, these deviations can be quantified to calculate the corresponding error values.

Machine Vision System Calibration

      In automated production lines, machine vision systems serve as critical tools for inspection and control. Optical targets are widely used to calibrate components such as lenses and sensors within these systems, ensuring accurate recognition of marks or features on products, thereby guaranteeing the precision of quality inspection and sorting processes.

II. Scientific Research

      In optical imaging research, optical targets serve as standardized test objects to evaluate key performance metrics of imaging systems, including resolution and contrast. For instance, by varying the pattern complexity and feature size of the target, researchers can observe and analyze system performance under different conditions.

      In experiments studying light propagation, scattering, reflection, and other optical phenomena, optical targets can provide controlled reflective or scattering sources, aiding scientists in investigating the fundamental interactions between light and matter.

III. Optoelectronic Conversion

      Optical targets facilitate optoelectronic measurement and control by converting optical signals into electrical signals. For example, mounting an optical target (e.g., a coded pattern or grating) onto a high-speed rotor enables optoelectronic speed measurement—rotational speed is calculated by detecting periodic changes in the optical grating signal.

      Calibration Function: High-precision optical targets are indispensable calibration tools in fields such as optical metrology, machine vision, and robotic vision. By detecting known geometric features on the target, intrinsic parameters of new instruments can be determined, or existing systems can be recalibrated—significantly enhancing measurement accuracy and system stability.

IV. 3D Measurement

      In vision-based measurement systems, optical targets are employed for object localization and pose estimation in multi-camera setups. By capturing images of the target from multiple viewpoints, large-scale objects can be accurately measured, greatly expanding the applicability of vision-based metrology techniques.

      Diffuse reflectance targets, commonly used in optical testing, find extensive applications in LiDAR, autonomous driving, remote sensing experiments, laser guidance, and spectral measurements. Their excellent performance and ease of use make them essential tools across these domains. As technology continues to advance, demand for high-performance diffuse reflectance targets will grow, further broadening their range of applications.