Electron Emission Projection Imager
  A new projection type imaging system is presented. The system can directly image the field emission site distribution on a cathode surface by making use of anode screens in the standard parallel plate configuration. The lateral spatial resolution of the imager is between 1 and 10 {\mu}m. The imaging sensitivity to the field emission current can be better than the current sensitivity of a typical electrometer, i.e. less than 1 nA. 
Stanislav S. Baturin and Sergey V. Baryshev
physics.ins-det