Contact
Calibration radiometers & optical detectors at The National Laboratory
The National Laboratory for Photometry and Radiometry offers calibration of radiometers, laser power meters and optical detectors.
Purpose
The national laboratories are responsible for maintaining the national reference standards for each measurement quantity and spreading metrological competens and traceability to industry and society at large. The national reference standards are the highest level of traceability in Sweden.
A calibration performed at a national laboratory fullfils all typical traceability and accreditation requirements that commonly exist in industry and society at large.
Method
Calibration is performed in accordance with existing internations standards and recommendations.
A calibration consists of two parts, spectral responsivity and absolute responsivity.
Spectral responsivity involves the detector being exposed to light at varying wavelengths from a monochromator in comparison with a reference detector. The calibration can span responsivities from 250 nm to 1600 nm. Typical test objects include silicon, germanium and InGaAs detectors.
Absolute responsivity is calibrationed with laser light at certain wavelengths e.g. 514 nm, 633 nm or 1550 nm. Either a reference detector or a reference radiometer is used as a reference. Radiometers are typically calibrated at 200 µW up to 10 mW. Laser power meters can be calibrated up to around 800 mW.
Deliveries
The calibration results are reported in a digital calibration certificate in Swedish or English which states that the calibration was performed at a national laboratory.
