Remote sensor would use lasers to 'sniff out' life on Mars

The device, known as the Bio-indicator Lidar Instrument (BILI), could be used to detect fluorescence from trace compounds in the Martian atmosphere.

Earth observation satellites already use fluorescence Lidar to detect chemicals implicating climate change in our atmosphere, but the technique has never been used in science on other planets. "NASA has never used it before for planetary ground level exploration. If the agency develops it, it will be the first of a kind,” said technologist Branimir Blagojevic of the Goddard Space Flight Centre in Greenbelt, Maryland, who is leading a team developing a prototype instrument aimed at proving that this remote technique is feasible for use on Mars.

Previously, Blagojevic worked for Science and Engineering Services, which developed the version of the sensor used by the US military. The planetary science version is envisaged as being placed on a rover's mast. In operation, it would first scan the local environment looking for dust plumes. Once it had detected one, it would use two ultraviolet lasers to pulse light at the dust, causing certain particles to fluoresce. Analysing this fluorescence reveals whether the dust contains organic materials, and also gives information on the particle size.