Labsphere RSA-REF-50-DB Dual-Beam Reflectance Integrating Sphere
| Brand | Labsphere |
|---|---|
| Model | RSA-REF-50-DB |
| Illumination Geometry | 8°/h (8° illumination, hemispherical detection) |
| Sphere Diameter | 50 mm |
| Light Source | Integrated Tungsten-Halogen or Optional LED Module |
| Fiber Optic Interface | SMA 905 |
| Compliance | ISO/CIE Compliant Optical Design |
| Origin | Shanghai, China |
| Distribution Status | Authorized Distributor |
Overview
The Labsphere RSA-REF-50-DB Dual-Beam Reflectance Integrating Sphere is an engineered optical measurement system designed for precise, repeatable spectral reflectance characterization of flat, diffuse, and near-Lambertian surfaces. Based on fundamental principles of integrating sphere photometry—where incident light undergoes multiple diffuse reflections within a highly reflective PTFE-coated interior—the RSA-REF-50-DB implements an 8°/h (8-degree illumination / hemispherical collection) geometry in accordance with ISO 27677:2022 and CIE Publication No. 177. This configuration ensures minimal angular dependency and high spatial uniformity across the sample plane, making it suitable for colorimetric analysis, coating quality control, pigment evaluation, and material qualification in R&D and production environments.
Key Features
- Compact 50-mm-diameter integrating sphere with >99% reflectance PTFE coating (spectral range: 250–2500 nm), optimized for stability and low stray-light contribution.
- Dual-beam architecture enables real-time reference compensation: one beam illuminates the sample while the second simultaneously monitors source intensity drift, minimizing measurement uncertainty due to thermal or aging effects.
- Integrated tungsten-halogen broadband source (360–2500 nm) with optional LED-based illumination modules for UV-Vis or Vis-NIR spectral targeting—both field-replaceable without tools beyond two bottom-mounted screws.
- SMA 905 fiber optic port positioned at hemispherical exit enables direct coupling to benchtop or portable spectrometers (e.g., Ocean Insight, Avantes, or StellarNet models) for full spectral reflectance output (R(λ)) from 250 nm to 2500 nm.
- Mechanically robust aluminum housing with anodized finish; rated for operation in ambient temperatures from 15°C to 30°C and relative humidity ≤70% non-condensing—validated for both laboratory benchtop and controlled field deployment.
Sample Compatibility & Compliance
The RSA-REF-50-DB accommodates planar samples up to 25 mm × 25 mm with thickness ≤10 mm, including painted panels, ceramic tiles, polymer films, anodized metals, and printed substrates. Its fixed 8°/h geometry conforms to ASTM E2539 (Standard Practice for Measuring Spectral Reflectance Using Integrating Spheres) and supports traceable calibration via NIST-traceable reflectance standards (e.g., Labsphere’s STAN-010-010 or SRS-010 series). The system supports GLP-compliant workflows when paired with spectrometer software that maintains audit trails, user access logs, and electronic signatures per FDA 21 CFR Part 11 requirements.
Software & Data Management
No proprietary software is embedded; the RSA-REF-50-DB operates as a hardware interface compatible with industry-standard spectral acquisition platforms—including OceanView, AvaSoft, or custom LabVIEW/Python-based drivers. Raw spectral data (intensity vs. wavelength) is exported in ASCII or CSV format for downstream processing in MATLAB, R, or color science toolkits (e.g., Colour Science for Python). When integrated into automated QA/QC lines, the sphere’s stable optical response enables reproducible integration with LIMS or MES systems via TCP/IP or RS-232 protocols.
Applications
- Color consistency validation of automotive clearcoats and interior trim under standardized D65 or A illuminants.
- Quantitative assessment of anti-reflective (AR) and high-reflectance (HR) thin-film coatings on optical components.
- Batch-to-batch verification of pigment dispersion homogeneity in inkjet inks and industrial paints.
- Non-destructive evaluation of weathering-induced reflectance degradation in outdoor architectural materials (e.g., PVDF-coated aluminum panels).
- Calibration transfer between spectrophotometers using sphere-based reference measurements traceable to primary standards.
FAQ
What spectral range is supported by the RSA-REF-50-DB?
The system supports full-range spectral reflectance measurement from 250 nm to 2500 nm when coupled with a compatible grating spectrometer and appropriate detector array (e.g., Si CCD for UV-Vis, InGaAs for NIR).
Can the RSA-REF-50-DB be used for measuring specular reflectance?
No—it is configured exclusively for diffuse + total reflectance (8°/h geometry). Specular-included measurements require a different goniometric setup or a 0°/0° or 45°/0° accessory.
Is NIST-traceable calibration included with purchase?
A factory-calibrated reflectance standard (e.g., STAN-010-010) may be ordered separately; calibration certificates are issued with documented uncertainty budgets per ISO/IEC 17025.
How often should the PTFE coating be inspected or replaced?
Under normal use, the coating retains >99% reflectance for ≥5 years; visual inspection for yellowing or abrasion is recommended annually, with recoating available through Labsphere Service Centers.
Does the dual-beam design eliminate the need for frequent reference measurements?
It significantly reduces drift-related error but does not replace routine reference checks—best practice remains acquiring a reference scan every 2–4 hours during extended sessions or after environmental shifts.
