Radiant Zemax IS Series BRDF/BTDF Material Characterization System
| Brand | Radiant Zemmax |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Models | IS-LI, IS-VA, IS-SA |
| Pricing | Available Upon Request |
Overview
The Radiant Zemax IS Series BRDF/BTDF Material Characterization System is a high-speed, imaging-based goniophotometric platform engineered for spatially resolved optical characterization of light-emitting devices, display panels, and scattering materials. At its core, the system integrates a scientific-grade ProMetric imaging photometer with a motorized hemispherical measurement enclosure—commonly referred to as an Imaging Sphere (IS). Unlike conventional point-scanning goniometers or distributed photometers, the IS architecture captures the full angular luminance distribution in a single acquisition cycle using calibrated wide-angle optics and pixel-level radiometric calibration. This enables rapid, non-contact measurement of bidirectional reflectance distribution functions (BRDF) and bidirectional transmittance distribution functions (BTDF) across near-hemispherical solid angles (up to ~2π sr), with typical acquisition times ranging from 1 to 10 seconds per sample orientation. The system operates on the principle of imaging goniometry: incident illumination geometry is precisely controlled while the camera records spatially resolved radiance values across all observable exitant directions, enabling reconstruction of angular scattering signatures compliant with CIE 171:2006 and ASTM E2983–22 standards.
Key Features
- Modular configuration supporting three dedicated operational modes: IS-LI (luminous intensity mapping), IS-VA (display viewing angle analysis), and IS-SA (material BRDF/BTDF quantification)
- ProMetric I-series imaging photometer with 16-bit dynamic range, NIST-traceable photopic and radiometric calibration, and optional spectral sensitivity extension (380–780 nm)
- Motorized hemispherical gantry with programmable source positioning—reference lamp translation range up to ±400 mm along vertical axis for optimal illumination uniformity and collimation control
- Automated angular sampling resolution configurable from 0.1° to 5° increments, supporting both polar and Cartesian projection output formats
- Integrated thermal stabilization for detector and illumination subsystems to ensure measurement repeatability (<0.5% RMS variation over 8-hour operation)
- Compliance-ready architecture supporting audit trails, user access controls, and electronic signature functionality aligned with FDA 21 CFR Part 11 and ISO/IEC 17025 requirements
Sample Compatibility & Compliance
The IS Series accommodates planar and mildly curved samples up to 300 mm in diameter (IS-SA), LED packages and miniature lamps (IS-LI), and active display modules including OLED, microLED, LCD, and e-paper technologies (IS-VA). All measurement protocols adhere to internationally recognized optical metrology standards: BRDF/BTDF data acquisition follows ISO 13655:2017 (spectral measurements) and ASTM E2758–21 (goniophotometric methods); display characterization conforms to VESA DisplayHDR™ test specifications and ISO 9241-307:2018 (viewing angle performance). System validation includes factory-installed reference standards traceable to NIST SRM 2020 and 2021, with optional on-site verification kits available for GLP/GMP environments.
Software & Data Management
Operation is managed via TrueTest™ software v6.0+, a Windows-based application providing real-time visualization, automated report generation (PDF/CSV/XML), and customizable analysis workflows. The software supports batch processing of multi-condition datasets (e.g., wavelength-dependent BRDF at 10 nm intervals), export of BSDF matrices in ASAP, LightTools, and OpticStudio-compatible formats, and integration with MATLAB and Python APIs for custom algorithm development. Data integrity safeguards include timestamped metadata logging, immutable raw image archives, and role-based permissions for instrument configuration, measurement execution, and result export—fully auditable for regulated quality systems.
Applications
- LED package design validation: far-field intensity distribution, beam pattern homogeneity, chromaticity uniformity across viewing angles
- Display R&D: luminance rolloff, color shift (Δu’v’), contrast ratio degradation, and specular glare assessment under variable ambient conditions
- Advanced material development: characterization of diffusers, privacy films, anti-glare coatings, translucent polymers, and metamaterial surfaces
- Automotive lighting certification: compliance testing against ECE R149 and SAE J1383 for headlamp scatter profiles
- AR/VR optical component qualification: waveguide efficiency mapping, exit pupil uniformity, and ghost image quantification
FAQ
What is the maximum measurable solid angle for BRDF/BTDF acquisition?
The IS-SA configuration covers up to ~2π steradians (full hemisphere) with continuous azimuthal rotation and polar coverage from 0° to 90°.
Can the system measure both reflective and transmissive samples without hardware reconfiguration?
Yes—the IS-SA supports interchangeable illumination paths (top-down reflectance vs. bottom-up transmittance) via motorized mirror and aperture modules; no manual realignment is required.
Is spectral BRDF measurement supported out-of-the-box?
Standard configurations include broadband photopic response; spectral BRDF requires optional ProMetric iS-xx-S model with integrated monochromator and sequential wavelength scanning capability.
Does the system support automated pass/fail evaluation against industry thresholds?
TrueTest™ includes configurable limit templates aligned with VESA, ISO, and internal specification limits, with visual overlay and statistical summary reporting.
How is calibration maintained between scheduled service intervals?
Built-in self-check routines verify detector linearity and lens vignetting monthly; NIST-traceable reference tiles are provided for user-performed daily verification.
