| Zugriffsnummer | 34728 |
| Dokumenttyp | Buchartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Length and size |
| Autor(in); Institution |
Schödel, René; 5.4, Interferometrie an Maßverkörperungen, PTB-Braunschweig
|
| Quelle/Jahr | Handbook of optical metrology : principles and applications:(2015), 405 - 432 |
| Auflage | 2. Edition |
| Herausgeber(in) |
Yoshizawa, Toru
|
| ISBN | 978-1-4665-7359-8 (PRINT) ; 978-1-4665-7361-1 (ONLINE) |
| DOI | |
| URL | |
| Verlag | Boca Raton, Fla. [u.a.]: CRC Press, Taylor & Francis Group |
| Zusammenfassung | The provision of length standards and the ability to measure length to a required accuracy are of fundamental importance to any technologically developed society. Throughout history, there have been many standards for length beginning with simple definitions based on the human body, for example, cubit and feet. The continuing refinement of standards led to more specific definitions and more accurate methods of realizing them. As a milestone, in 1887, Michelson proposed the use of optical interferometers for the measurement of length. However, it needed many years until the meter was defined in terms of the vacuum wavelength of light from a krypton lamp. In 1960, this definition replaced the International Prototypes deposited in 1889 at the Bureau International des Poids et Mesures (BIPM), where they remain today. Since 1983, the meter, one of the seven base units of the SI, is defined as the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second [1]. This definition is based on the availability of primary frequency standards (atomic clocks) defining a second accurately. |
