ISO 19012-4:2024 PDF

Overview

ISO 19012-4:2024 is an international standard that specifies the designation and polarization characteristics of microscope objectives used in polarization microscopy. It defines the marking system for polarization microscope objectives and establishes standardized measurement procedures to evaluate their polarization performance. This ensures consistent qualitative polarization imaging by detailing the extinction ratio measurement on the image plane of the objective lens. The standard aligns with ISO 8578 regarding marking conventions but excludes objectives used exclusively on stereomicroscopes.

This standard supports manufacturers and users in verifying and communicating objective lenses' polarization properties, essential for accurate microscopy applications where polarization effects are critical.

Key Topics

• Polarization Characteristics of Objectives The standard focuses on minimizing the influence of objective lenses on polarization imaging by defining measurable polarization parameters.

• Extinction Ratio Definition and Requirements The extinction ratio (r) is key to assessing polarization performance, calculated as the ratio of transmitted intensity through parallel polarizers to that through crossed polarizers. Required minimum extinction ratios vary by numerical aperture (NA) ranges:

  • NA