LabSphere SRT Calibration Standard Reflectance Panels

Overview

The LabSphere SRT Calibration Standard Reflectance Panels are precision-engineered reference artifacts designed for radiometric and photometric calibration of spectrophotometers, integrating spheres, goniophotometers, hyperspectral imagers, and other optical measurement systems. These panels operate on the principle of diffuse reflectance calibration—leveraging spectrally stable, Lambertian-scattering surfaces to provide traceable, NIST-traceable reflectance values across ultraviolet, visible, near-infrared (NIR), short-wave infrared (SWIR), and mid-wave infrared (MWIR) spectral regions. Each panel is characterized with certified reflectance data at discrete wavelength intervals (e.g., 1 nm or 5 nm resolution), enabling absolute reflectance correction in quantitative spectroscopic analysis. The SRT series supports both relative and absolute reflectance measurements in compliance with ISO 13655:2017 (Graphic technology — Spectral measurement and colorimetric computation for graphic arts images) and ASTM E259-21 (Standard Practice for Specifying and Verifying the Performance of Integrating Sphere Spectrophotometers).

Key Features

• Traceable reflectance values certified by LabSphere’s ISO/IEC 17025-accredited calibration laboratory, with uncertainty budgets reported per NIST SP 250-85 guidelines.
• Multiple surface types: pressed polytetrafluoroethylene (PTFE)-based white standards (2%–99% reflectance), neutral gray tiles (10%, 20%, 40%, 60%, 80%), chromatic color standards (CIE LAB coordinates provided), and gold-coated aluminum substrates for IR applications (700 nm–20 µm).
• Available in diameters from 25 mm up to 610 mm (24 inches), with custom mounting options including threaded inserts, kinematic mounts, and vacuum-compatible flanges.
• Fluorescence calibration panels available for excitation wavelengths ranging from 254 nm (UVC) to 405 nm (violet), with certified quantum yield and emission spectra referenced to NIST SRM 2035.
• Robust mechanical architecture: PTFE-based substrates exhibit minimal aging under ambient lab conditions; gold-coated IR panels feature enhanced adhesion and thermal stability up to 80 °C.

Sample Compatibility & Compliance

The SRT panels are compatible with all major commercial spectrometers—including PerkinElmer Lambda, Agilent Cary, Shimadzu UV-3600+, Ocean Insight QE Pro, and ASD FieldSpec—as well as custom-built optical benches. All white and gray standards meet ISO 9001 manufacturing controls and undergo batch-level spectral uniformity verification (±0.2% spatial reflectance variation over active area). Fluorescent standards comply with ISO 17025 requirements for metrological traceability and include full spectral irradiance responsivity curves. Gold-coated IR panels conform to MIL-C-48497A for coating durability and are validated per ASTM E1333-20 for bidirectional reflectance distribution function (BRDF) stability.

Software & Data Management

LabSphere provides downloadable calibration certificates in PDF and CSV formats, including full spectral reflectance tables (wavelength vs. %R), uncertainty profiles, and environmental condition logs (temperature, humidity, calibration date). Optional integration with third-party software platforms—such as OceanView, WinSPAM, and MATLAB-based spectral processing toolboxes—is supported via standardized ASCII spectral data files (.spc, .txt). Audit trails and electronic signature functionality align with FDA 21 CFR Part 11 requirements when used within validated GxP environments.

Applications

• Baseline correction and stray-light compensation in UV-Vis-NIR absorbance and transmittance measurements.
• Calibration of hyperspectral sensors in remote sensing validation campaigns (e.g., NASA AERONET, ESA Fiducial Reference Measurements).
• Color measurement traceability for ISO/TC 130 printing standards and automotive paint evaluation per SAE J1545.
• Quantitative fluorescence intensity normalization in life science imaging and microplate reader validation.
• Reflectance-based emissivity modeling for thermal infrared radiometry and climate monitoring instrumentation.

FAQ

Are SRT panels NIST-traceable?
Yes—each panel ships with a certificate referencing NIST-traceable measurement chains through LabSphere’s A2LA-accredited calibration lab.
What is the recommended recalibration interval?
Annual recalibration is advised for critical GMP/GLP applications; biennial intervals are acceptable for routine R&D use under controlled environmental conditions.
Can SRT panels be cleaned without affecting reflectance?
PTFE-based panels may be gently rinsed with deionized water and dried with lint-free nitrogen; alcohol or abrasive cleaning is strictly prohibited.
Do gold-coated IR panels require special handling?
Yes—they must be protected from fingerprints, sulfur-containing vapors, and mechanical abrasion; storage in nitrogen-purged desiccators is recommended.
Is spectral data provided for custom excitation wavelengths?
Yes—fluorescence standards can be characterized at user-specified excitation wavelengths (254–405 nm) upon request, with full emission spectra delivered in calibrated radiometric units (µW·sr⁻¹·nm⁻¹).