A Triboelectric Closed‐Loop Sensing System for Authenticity Identification of Paper‐Based Artworks.

Nondestructive testing (NDT) is crucial technology for authenticity identification of paper‐based artworks. Emerging optical spectroscopy is an important technique of NDT at present, by which high‐bightness light, electron beams, and rays could cause permanent damage to different types of paper‐based artworks. Here, using only NDT technology, triboelectric closed‐loop sensing system (TE‐CLSS) is developed by contact electrification effect. It is composed of a stethoscope‐like triboelectric nanogenerator (SL‐TENG) and matched closed‐loop feedback circuit (CLFC), that is capable of active sensing in a similar way to a stethoscope when it makes slight contact with the surface of object. The results report that the ΔV accuracy of TE‐CLSS could achieve 0.01 V, with relative error of measurement within 3%, and average response time of 0.205 s. Furthermore, it could sense the area change of the test material layers that accurately reach millimeter level, by which different grayscale values, colored inks, and oil paintings are successfully identified. This work gives a new insight into the future NDT technologies suitable for the identification of cultural relics. [ABSTRACT FROM AUTHOR]