Application and method for checking documents with effective optical diffraction security layer

The invention relates to an inspection device and method for file. Until now, comprising a cable safety layer, specifically with hologram is arranged in the vehicle soaring optical test technique to the detection. The whole test method time-consuming is very length, so of the detecting un-re-changeable program process of the machine adopts a. Quick communication port of talk-show and campaign the security rating of the strata a time. The reflective light effect layer is a metallic layer and/or the partial metal layer and/or the metal layer area of the plane. Liquid claims of the conductive different measuring method. Practice are of a non-contact capacitor measuring method is feasible.