OL 458-4 White-Light LED-Based Uniform Integrating Sphere Source
| Brand | Optronic Laboratories |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | OL 458-4 |
| Pricing | Upon Request |
Overview
The OL 458-4 is a NIST-traceable, white-light LED-based uniform integrating sphere source engineered for high-accuracy radiometric, photometric, and spectral radiance calibration. Designed and manufactured by Optronic Laboratories—a U.S.-based leader in optical radiation standards since 1970—the OL 458-4 serves as a primary or secondary transfer standard for calibrating imaging photometers, luminance meters, spectroradiometers, radiance standards, image intensifiers, and CCD/CMOS-based radiometric cameras. Its operation relies on a precisely stabilized, broadband white LED array mounted within a high-reflectance (≥98% BaSO₄-coated) integrating sphere, producing spatially uniform, Lambertian output across the visible spectrum (380–780 nm). Unlike filtered tungsten or arc-lamp sources, the OL 458-4 delivers continuous spectral irradiance without discrete emission lines or thermal drift—enabling stable, reproducible calibrations under ambient laboratory conditions.
Key Features
- NIST-traceable spectral radiance and luminance calibration certificates provided with each unit, traceable to NIST Standard Reference Materials (SRMs) and maintained via documented uncertainty budgets per ISO/IEC 17025 requirements.
- Integrated precision constant-current LED driver with active thermal regulation (±0.1 °C stability), minimizing spectral shift and output drift (<0.2% over 8 hours at 25 °C ambient).
- Optimized integrating sphere geometry (4-inch diameter) with baffle-free internal design and calibrated port configuration for minimal vignetting and maximal spatial uniformity (>99.2% over central 80% of exit aperture).
- Factory-calibrated absolute spectral radiance (W·sr⁻¹·m⁻²·nm⁻¹) and photopic luminance (cd·m⁻²) values across the CIE 1931 2° observer function, delivered in machine-readable format (CSV, XML) compliant with ASTM E308 and CIE S 026.
- Modular electrical interface supporting both analog (0–10 V) and digital (RS-232, optional USB-C) control for integration into automated calibration workflows.
Sample Compatibility & Compliance
The OL 458-4 is compatible with all commercially available luminance meters (e.g., Konica Minolta CS-2000, PR-730, Topcon SR-UL1), imaging photometers (e.g., Radiant Imaging ProMetric series), and spectroradiometers (e.g., Ocean Insight QE Pro, AVANTES AvaSpec). Its output meets the geometric and spectral requirements defined in ISO/CIE 11664-2 (Colorimetry – Part 2: CIE Standard Illuminant D65), ANSI C78.377 (Chromaticity Specifications for White LEDs), and IEC 62471 (Photobiological Safety of Lamps). The system supports GLP/GMP-compliant calibration records with full audit trail capability when used with Optronic’s certified calibration software suite.
Software & Data Management
Optronic Laboratories provides the OL-Suite v4.2 calibration management software, which enables automated data acquisition, spectral interpolation, uncertainty propagation, and report generation in accordance with ISO/IEC 17025 Annex A.5. All calibration data—including spectral radiance curves, photometric weighting integrals, and temperature-compensated stability logs—are stored in vendor-neutral HDF5 format. Software supports 21 CFR Part 11-compliant electronic signatures, user access controls, and revision history tracking. Export options include PDF reports compliant with NIST SP 250-102 and ASTM E2758-20.
Applications
- Primary calibration of reference luminance standards in national metrology institutes (NMIs) and accredited calibration laboratories.
- Verification and linearity testing of display measurement systems (OLED, microLED, LCD) per VESA DisplayHDR and ISO 9241-307 protocols.
- Validation of automotive head-up display (HUD) and instrument cluster luminance uniformity measurements.
- Traceable calibration of night-vision device test equipment (e.g., NV-100, AN/AVS-9) per MIL-STD-3009 and STANAG 4383.
- Development and validation of spectral correction algorithms for hyperspectral imaging sensors operating in visible bands.
FAQ
Is the OL 458-4 suitable for calibrating spectroradiometers requiring UV or NIR extension?
No—the OL 458-4 is optimized for the visible spectrum (380–780 nm) and does not provide significant output below 380 nm or above 780 nm. For extended-range applications, Optronic offers the OL 458-UV or OL 458-NIR variants.
Does the unit include a full NIST-traceable calibration certificate?
Yes—each OL 458-4 ships with a comprehensive calibration certificate issued by Optronic Laboratories’ ISO/IEC 17025-accredited calibration laboratory, including expanded uncertainty (k=2), measurement conditions, and traceability chain documentation.
Can the output luminance level be adjusted dynamically during operation?
Yes—luminance is continuously adjustable from 0.1 to 10,000 cd·m⁻² via analog voltage input or digital command set, with linearity deviation <±0.3% across the full range.
What maintenance is required to sustain NIST traceability?
Annual recalibration is recommended; Optronic Laboratories offers on-site or return-to-factory recalibration services with updated uncertainty analysis and renewed traceability documentation.
Is the OL 458-4 compatible with third-party automation platforms such as LabVIEW or Python?
Yes—full SCPI command set and DLL libraries are provided for seamless integration into custom test sequences using LabVIEW, MATLAB, or Python (PySerial, NumPy, HDF5 support included).
