Labsphere uniform sources are engineered to provide highly uniform, stable illumination for calibration, testing, and validation across demanding optical applications. But maintaining that performance requires certified calibration and service.
If your system:
… It’s time to schedule calibration.
Professional Calibration for Labsphere and Other Uniform Light Sources
Ensure your uniform light source is operating exactly to specification with our professional calibration service. Whether you use a Labsphere system or another manufacturer’s source, periodic calibration is essential for maintaining reliable, traceable radiometric performance.
Over time, even the most stable optical systems experience natural changes — lamp ageing, coating degradation, and environmental factors can all affect output levels and spectral behaviour. If your measurements depend on consistent, uniform radiance, calibration isn’t simply recommended — it’s critical.
Why Regular Calibration Matters
Recalibration helps ensure your system continues to perform at its designed level. Our service provides:
You should schedule calibration if your system:
Expert Calibration You Can Trust
While in‑house checks are useful, they cannot replicate original factory‑level calibration methods or provide the same level of measurement traceability.
Book Your Calibration
Maintain accuracy, extend system lifespan, and protect the integrity of your measurements with professional calibration support from SphereOptics.
For smaller uniform light sources, SphereOptics can fully arrange secure shipping to Labsphere for factory calibration.
For larger systems, where transport is impractical, SphereOptics provides on‑site calibration services carried out directly at your facility by Labsphere engineers.
On‑Site Uniform Light Source Calibration Services
When your uniform source is too large, integrated, or mission‑critical to be shipped, SphereOptics brings certified calibration expertise provided by Labsphere directly to your facility. Our on‑site service minimises downtime, avoids shipping risks, and ensures your system maintains the radiometric accuracy required for demanding optical measurements.
Labsphere will ensure the same rigorous, NIST‑traceable procedures used in factory calibrations—performed on‑site, using specialised transfer standards and validated measurement methods.
What Our On‑Site Service Includes
Labsphere engineers perform a complete evaluation and calibration of your uniform source, including:
✓ Professional system assessment – Inspection of sphere coatings, lamps, baffles, internal components, and any factors that may affect radiance uniformity.
✓ Re‑lamp and performance verification – If required, we replace lamps and take before‑and‑after radiance measurements to confirm performance stability.
✓ Power supply verification – Optional calibration and verification of the system power supply to ensure operating currents match specification.
✓ NIST‑traceable radiance calibration – All measurements follow strict radiometric transfer procedures traceable to NIST, with reported uncertainties.
How the On‑Site Calibration Works (Simplified Overview)
To ensure traceable results equivalent to factory calibration, the process uses a Spectralon® diffuse reflectance target irradiated by a calibrated FEL tungsten‑halogen spectral irradiance lamp standard.
This combination forms a reference of known spectral radiance:
L = (E × ρ)/π
Where:
This reference radiance is then used to calibrate the field spectroradiometer. Key steps include:
A complete uncertainty analysis is performed following GUM guidelines, taking into account:
This ensures your calibration is traceable, defensible, and auditable.
On‑Site Calibration Suitability
On‑site calibration is ideal when:
For some systems, an Optical Validation Kit may be brought to your site to validate the calibration levels and ensure optimal measurement conditions.
How to Arrange an On‑Site Calibration
Factory Calibration for Smaller Uniform Light Sources
For smaller uniform light sources that can be safely transported, SphereOptics provides a complete managed service to ensure your system receives the highest‑accuracy factory calibration at the Labsphere laboratory.
We handle all shipping logistics, including export and import formalities, ensuring your equipment travels securely and arrives ready for service. Once received, Labsphere performs a full laboratory calibration using the same controlled conditions and reference instrumentation used for production testing
What Factory Calibration Includes
When your system is serviced at the Labsphere facility, it receives the full suite of advanced calibrations, including:
✓ Spatial uniformity measurement – Verification that the sphere output is uniform across the emitting plane—ensuring measurement consistency across the entire field.
✓ Angular uniformity assessment – Characterisation of radiance performance across different viewing angles to achieve the lowest possible calibration uncertainties.
✓ NIST‑traceable radiance and spectral calibration – Performed under tightly controlled laboratory conditions with certified reference instruments.
These detailed calibrations help ensure your uniform source performs exactly as specified. For deeper insight into the importance and methodology behind uniformity measurements, we recommend Labsphere’s white paper:
“Perfectly Understood Non‑Uniformity.”
How the Process Works
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