Sunsensors for Satellites and Space Applications2021-06-20T13:30:04+01:00

Slide BiSon64-ET-B The most reliable sun sensor
for extreme conditions
in space.
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2103, 2021

Tested beyond levels required

Last week the new custom developed photodiodes that are used in the Lens R&D fine Sunsensors (BiSon and MAUS) have been tested at the Delft Reactor Institute (DRI) to levels beyond what would be required for any known mission. Given the high radiation levels to be tested for the devices it had become impractical to perform regular Co60 tests for Total Ionizing Dose (TID) and Proton tests for displacement damage (TNID). Following discussions with ESA on how to best test the diodes it was decided to use 1MeV electrons instead. These tests are also used for solarcells which means that [...]

1503, 2021

mystery solved

Last year we performed what is called so called highly accelerated life testing (HALT) and during these tests it turned out that even though the setup is only taken to 125°C for 2000 hours, there was a failure on the pigtails that were connected to some of the Sunsensors. The root cause of this failure was a mystery until today. In advance of the HALT test we irradiated 6 diodes with 4 10^14 1MeV electrons (equivalent to 9.4Mrad) Because we are preparing for additional radiation tests taking the diodes up to 8.10^14 1MeV electrons (18.8Mrad) we needed 6 pigtails again [...]

1203, 2021

To boldly go where no Sunsensor has gone before

The original idea for the Lens R&D extended temperature Sunsensors was born when ESA was working on their Mars rover. In order to allow sterilisation and avoid biocontamination, the sensors should be able to withstand high temperatures and be vented (non-hermetic) During the night time on Mars the sensors should be able to cope with very low temperatures though. This set of requirements is met by carefully balancing the CTE of the different materials used and development of a dedicated glue. Although ESA decided not to go with our sensors, the development was continued and resulted in the a sensor [...]

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