imec adds filters to hyperspectral sensor for small satellites
imec in Belgium has developed a hyperspectral sensor with a high signal to noise ratio for for earth observation from small satellites
The monolithic hyperspectral sensor developed by imec contains a line-based filter on chip and has a broad spectral range of 450-900 nm across 96 bands with high, uniform light sensitivity.
The optimized process technology ensures a very low sensor-to-sensor variability making these sensors suitable for satellite constellations monitoring agriculture, biodiversity, water and air quality, and mining.
To improve the sensor performance, imec integrated specialized thin-film spectral filters on a CMV2000 sensor that already has a track record in space applications. The resulting sensor provides an across-flight resolution of 2048px with a 2/3” optical format and operates at frame
rates up to 340fps in full resolution.
By integrating thin-film filters monolithically onto the sensor, imec has created a robust and stable configuration. Unlike alternative setups that place separate optical elements between the lens and sensor, the integrated design guarantees detector alignment and is resistant to shocks, vibrations, and temperature fluctuations—a significant advantage for the harsh conditions of space.
The use of spectral imaging from space is experiencing rapid growth, with many companies building constellations of small satellites to, for example, screen for plant diseases, monitor coastal areas or calculate biomass indices for forest management.
A wider spectral range for the sensor allows for the detection of a variety of features, while good light sensitivity ensures that even faint signals can be accurately captured.
Multiple regions of interest (ROI) can be defined on the sensor, providing the flexibility to serve
different types of missions: the sensor can be operated at full spectral resolution or specific bands can be selected, reducing data load while increasing frame rate and SNR.
There are 10 digital TDI (time-delayed-integration) stages per band, doubling the
TDI capability of the detector compared to the previous generation and boosting the SNR across its entire wavelength range and allowing for more accurate detection of features.
The sensor is available off-the-shelf for individual purchase units, providing low-barrier access to advanced technology and enabling businesses to start with a single unit for evaluation or to enter into supply agreements for larger quantities.
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