Calibration software AvaSoft-IRRAD

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Avantes spectrometers measure radiated optical energy, which can be quantified as a radiant flux, in energy per second (Watt) radiated from a source. The radiated optical energy can also be correlated with human vision (photometry), as defined in the CIE, to obtain a spectral luminous efficiency function to characterize the vision of an average human observer. An Avantes irradiance calibrated spectrometer system can measure both radiometric as well as photometric quantities. Radiometric quantities are radiant energy (in Joule), Radiant power or flux (in Watt) or irradiance (Watt per cm2). Related photometric quantities are luminous flux (lumen) or illuminance (lux or lumen per m2). The measured spectral distribution is used to calculate the above-mentioned parameters. An intensity-calibrated light source such as those in Avantes’ factory calibration laboratory or our field calibration lamps, the AvaLight-HAL-CAL or AvaLight-DH-CAL, with known energy output (in µWatt/cm2/nm) are used as a reference. Calibrations can be performed at Avantes’ factory laboratory or in the field and stored on the EEPROM of the spectrometer (or an independent file) for future usage. AvaSoft-IRRAD software is required for either type of calibration. The colour of light parameters can be expressed by the chromaticity coordinates x, y, and z. These chromaticity coordinates are obtained by taking the ratios of the tristimulus values (X, Y, and Z) to their sum. The tristimulus values X, Y, and Z and the spectral irradiance are computed in a wavelength range from 380 nm to 780 nm, using a 1 nm interval.