| 摘要 |
<p>The present invention relates to a method that involves attaching permanently to the free end of a fixation member an information element which is made of a material transparent to an optical probing radiation. The information element installation method prevents the fixation member from being freely removed from the protected object. An automatic optical device is further used for recording an image of the inner structure of the body of the information element whose optical parameters alter upon any attempt to withdraw the latter or the fixation member. This image is used as an unique optical model of the information element.</p> |
