Mini Spectrometer, Copyright: Ibsen Photonics, Denmark.
Optical remote sensing uses visible or infrared sensors to detect a variety of targets by virtue of their inherent spectral characteristics, e.g. absorption, scattering or fluorescence. For water bodies such as oceans, estuaries or inland lakes, this information is vital for estimating important water properties, namely : the type and concentration of dissolved or suspended materials, water clarity, presence of algae and nature of the underlying ground. While the monitoring of water reserves have been done so far using satellite and airborne missions, the capabilities of Unmanned Aerial Vehicle (UAV) technology are currently being explored to utilize some of their unique advantages.
In order to have a light-weight, low flying UAV as a platform for water remote sensing, it needs to be equipped with a compact and high resolution optical sensor module that can collect detailed information on various water properties. At the heart of this sensor module are two extremely small and lightweight spectrometers which collect spectral information of the downwelling irradiance and the radiance reflected from water. Built with advanced transmission grating technology and back thinned CCD detectors, these spectrometers are amazingly sensitive and have spectral resolution of the order of 1 nm while having the size and weight of a matchbox! Such small spectral sensors are for the first time being applied in the field of water remote sensing and are expected to measure water reflectance, organic matter absorption and algal fluorescence. To perform these tasks efficiently, it is a prime requirement to have complete characterization and calibration of these mini spectrometers, which will be done at the highly specialized Calibration Home Base (CHB) laboratory in DLR- Remote Sensing Technology Institute, Oberpfaffenhofen. The CHB is equipped with dedicated instrumentation and software for automated measurements.
Characterization of sensor parameters (e.g. response functions, stability, noise, stray light), for the two mini spectrometers:
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Duration of contract:
min. 6 months
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