The metal bar code is composed of a series of thin melal bars of various widths (copper), which is genereted by information encoding rule and adheres to plastic substrate, this articl presents a method to measure the width of with even thickness metal bar by using the SHEV'S principle and discusses the main technological problem about the reseach on the metal bar code scanner.

Based on introducing the working principles of the metal bar code,a method to manage drill string by planting metal bar code into the connection was developed.

The post-buckling property of two metal strips in thermal state is studied by improved L-P method of nonlinear vibration,and the effects of various temperature factor and others on post-buckling of two metal strips are discussed.