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High-Accuracy 3D Optical Profilometry for Analysis of Surface Condition of Modern Circulated Coins

2020; Multidisciplinary Digital Publishing Institute; Volume: 13; Issue: 23 Linguagem: Inglês

10.3390/ma13235371

1996-1944

Wojciech Kapłonek, Tadeusz Mikołajczyk, Danil Yurievich Pimenov, Munish Kumar Gupta, Mozammel Mia, Shubham Sharma, Karali Patra, Marzena Sutowska,

Welding Techniques and Residual Stresses

The article shows that noncontact measurement techniques can be an important support to X-ray-based methods when examining the surface condition of modern circulated coins. The forms and degrees of wear of such coins, affecting their utility values, qualifying them as a legal tender in a given country, can be measured and analyzed, among other things, using advanced high-accuracy optical profilometry methods. The authors presented four analyses carried out for reverses and obverses of round coins (1 zloty, 1 franc, 50 bani, 5 pens) characterized by different degrees of surface wear. All of the coins were measured using 3D optical profilometers (Talysurf CLI 2000 and S neox) representing two generations of these types of systems. The obtained results confirm the validity of the applied high-accuracy measurement systems in conjunction with dedicated software in the presented applications. Examples of the analyses carried out can be a significant source of information on the condition of coins in the context of maintaining their functional properties (selection of appropriate wear-resistant alloys and correctness of the production process).