Certain applications such as radiometry demand exceptional linearity of detector response. Linearity refers to the correlation between a detector’s response and changes in the light intensity or integration time. Some detectors such as the 2048L detector contained in the AvaSpec-ULS2048L-USB2 require a specialized calibration to correct for non-linearities inherent to the detector. The NL-calibration service is available from Avantes to correct for detector non-linearities. Avantes USA can perform this calibration in as little as 1-2 business days. This service is included as a standard part of all intensity/irradiance calibrations (see below) provided by Avantes.
Intensity or irradiance calibration
Applications such as optical emission spectroscopy and radiometry require that the optical chain from the sample interface (integrating sphere, collimator, fiber or cosine corrector) to the detector be calibrated for intensity or irradiance. Such calibrations are performed in a specialized lab using a vibrational isolation table, stabilized power supply and NIST traceable light source. Instruments designed for the visible to near infrared (360-2500 nm) are typically calibrated with a quartz tungsten halogen source and instruments that are designed for the ultra violet (200-400 nm) are calibration with a deuterium source. Avantes offers the IRRAD-CAL-UV (200-400 nm), IRRAD-CAL-VIS (360-1100 nm), IRRAD-CAL-UV/ViS (200-1100 nm) and IRRAD-CAL-NIR (1000-2500 nm) calibration services for our customers that require irradiance or intensity calibration. Irradiance calibrations are performed on specific configurations with collection optics such as integrating spheres, cosine corrector that provide for sampling of radiant sources at a known surface area. These calibrations are referred to as absolute calibrations and they are directly traceable to NIST within certain uncertainty specifications. Intensity calibrations are typically performed on fibers, probes and collimators in order to provide for inter-instrument agreement over a population of spectrometers. Intensity calibrations are considered relative calibrations though they are performed using the same reference lamps as are used for the irradiance calibrations. Intensity calibrations are roughly traceable to NIST but are subject to greater uncertainties due to the characteristics of the sampling accessories used. Nearly all intensity and irradiance calibration services begin with a non-linearity calibration of the spectrometer. Irradiance and intensity calibration services require the spectrometer, fiber and sampling optics all be included in the calibration since each component contributes variability to the calibration. Avantes USA can perform the visible and near infra-red calibrations in as little as 1-2 business days for the 360-2500 nm wavelength ranges. Specialized configurations and all ultra violet calibration require return to our factory calibration lab and in these cases the calibration can be performed in as little as 5-7 business days.
Avantes, the Spectroscopy Partner you Can Trust
Avantes is an ISO 9001:2008 certified developer and manufacturer of fiber coupled spectrometers and fiber optic devices. We have twenty years experience with thousands of happy customers around the world. We are dedicated to our customer’s success and stand by our products with a full three year limited warranty on our instruments. You can feel confident trusting your annual and ad hoc spectrometer calibrations to the team you trust to build it.
Avantes Demo Program
Avantes continues to offer an extensive demo program for onsite feasibility testing. Contact your sales engineer today to inquire.