Methods and systems for detection and identification of concealed materials

A system comprising:

• a non-pixelated detecting component detecting incident electromagnetic radiation;
• a number of electromagnetic radiation sources;
• each electromagnetic radiation source emitting at substantially one wavelength from a number of wavelengths;
• at least some of the number of wavelengths substantially coinciding with wavelengths in an absorption spectrum of predetermined materials;
• each one of the number of the electromagnetic radiation sources illuminating an area of interest;
• the number of electromagnetic radiation sources emitting substantially from one location;
• the non-pixelated detecting component receiving reflected/scattered electromagnetic radiation from the area of interest;
• a modulating component modulating, with respect to time, emission from said each one of the number of electromagnetic radiation sources;
• said each one of the number of electromagnetic radiation sources being modulated at a non-harmonic frequency different from a non-harmonic frequency at which another one of the number of electromagnetic radiation sources is modulated;
• and
• an analysis component configured to:
• process an output of the non-pixelated detecting component, the output of the non-pixelated detecting component being obtained, by illuminating an area of interest, in order to obtain data at each wavelength from a plurality of wavelengths;
• the output of the non-pixelated pixelated detecting component, after processing, constituting a vector of processed data at the plurality of wavelengths;
• and
• compare the vector of processed data to a predetermined vector corresponding to a predetermined or presence of the predetermined material being determined by comparing the vector of processed data to said predetermined vector.