This is sometimes used as part of processes to build robots.
It is not normally used in sensor technology - as it is considered more harmful or intrusive than IR. However - it can be used to reveal things not normally visible in ambient light. It is not difficult to see a robot or machine using UV to check the validity of monatary notes.
Time to build your own robot! Using a Raspberry Pi with parts and some time, you can use my book to learn how to make and program a robot with automatic behaviours.