Optical measurements

We calibrate

  • optical radiometers (radiance and irradiance),
  • incandescent lamps (irradiance),
  • optical filters (transmittance).

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We characterise the optical radiometers for:

  • non-linearity,
  • angular response,
  • thermal sensitivity,
  • polarisation effects,
  • inherent straylight effects

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Irradiance sensors
Wavelength range (290...900) nm
Spectral irradiance* 100 nW m-2 nm-1 ... 500 mW m-2 nm-1
Calibration and measurement capability* (1,1 ...10) %

* Depends on the wavelength
Radiance sensors
Wavelength range (350...900) nm
Spectral radiance* 50 nW m-2 sr-1 nm-1 ...100 mW m-2 sr-1 nm-1
Calibration and measurement capability* (1,4 ...16) %
* Depends on the wavelength
Incandescent lamps
Wavelength range (340 … 900) nm
Irradiance* 100 nW m-2 nm-1 ... 500 mW m-2 nm-1
Calibration and measurement capability* (1,4...3,0) %
* Depends on the wavelength
Optical filters
Wavelength range (300 … 900) nm
Regular transmittance 0,0001…1
Calibration and measurement capability* (0,4 ...10,0) %
* Depends on the wavelength

Astronomy seminar

Current shortcomings in our understanding of dark matter distribution in our Galaxy and ongoing strategies for using the Milky Way to investigate the particle physics model for DM are discussed.
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Astronomy seminar

The cosmic web is vital for studying dark matter and the cosmological model and understanding galaxy evolution. However, detecting the cosmic web from observations is a complex task.