Detector based radiometry

The laboratory has a long tradition of making and applying filter radiometers for accurate radiometric and photometric measurements. Detector based measurement methods for spectral irradiance and luminous intensity developed in the laboratory are internationally recognized for their accuracy as compared to earlier source based measurement methods. Development work has directly resulted in three doctoral theses and ~10 diploma works, and contributed to various other theses. On-going work includes e.g. extrapolation of measurement capabilities to deep UV (200 nm - 290 nm) and near IR (900 - 2500 nm) regions.

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Project pictures

Figure 1. Calibration setup for measuring spectral irradiance standard lamps for solar UV measurements. Vertical optical axis is needed to produce the exact measurement conditions in the field.

Figure 2. Filter radiometer suitable for spectral irradiance and luminous intensity measurements. Due to its compact size, the filter radiometer can be carried to customer laboratories, which eliminates need to transfer fragile lamps.

Figure 3. Detector stabilized solar UV calibrator built in collaboration between HUT and STUK within a EU project. The device was tested in winter conditions in the Jokioinen weather station of FMI.

Figure 4. Spectral irradiance standard lamps calibrated at HUT are used to calibrate the Brewer spectroradiometers of FMI. These devices belong to a global network of spectroradiometers that monitor the status of the stratospheric ozone layer.


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