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Mechanics and Acoustics

Division 1

Weight, force, velocity, loudness -€“ the mechanical and acoustic quantities are cared for by Division 1. Apart from basic research, testing within the scope of legal metrology is a main task.

Head of Division

Head of Division
Dr.-Ing. Prof. h. c. Frank Härtig
Phone: +49 531 592-1010
Email: frank.haertig(at)ptb.de

Tasks

The Division carries out basic research in the field of mechanical and acoustical measurands. On the basis of the Units and Time Act, standards and standard measuring devices are developed with the aid of which the measurement scales for all relevant mechanical and acoustical measurands such as mass, force, torque, acceleration, flowrate of gases and liquids, sound and ultrasound pressure can be realized with maximum accuracy and disseminated, predominantly to DAkkS laboratories. The tasks of the Division also comprise type examinations and certifications of measuring instruments on the basis of national regulations - such as the Verification Act and the Verification Ordinance - of European Measuring Instruments Directives as well as international recommendations of the OIML. In addition, employees of the Division provide advice in all matters of relevant metrology, assess DAkkS and other calibration and test laboratories and cooperate in the respective national and international committees.

News

Die Übertragungsqualität von Beschallungsanlagen wird häufig mit dem Speech-Transmission-Index (STI) bewertet, welcher ihre Modulationsübertragung erfasst. Für Notfall-Sprachdurchsagen fordern die Richtlinien einen Mindestwert des STI von 0,5. Die STI-Messung erfolgt üblicherweise mit einem einfachen Messmikrofon. Aus der Praxis ist bekannt, dass dabei die erzielte reale Sprachverständlichkeit in...

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Die Masse von zwei aus einem neuen 28Si-Kristall hergestellten Siliziumkugeln konnte mit einer kombinierten Standardunsicherheit (k = 1) von 6,1 µg (relativ 6,1 · 10−9) im Vakuum bestimmt werden. Mit Hilfe eines Vakuum-Massekomparators des Typs Sartorius CCL1007 wurden die hierfür erforderlichen Messungen in einem Druckbereich von 3 · 10−3 Pa bis
5 · 10−4 Pa ausgeführt.

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Hydrophones are used to characterize the acoustical pressure of ultrasonic signals in water. They are commonly used by medical equipment manufacturers to characterize the acoustical fields of diagnostic and therapeutic medical equipment. Especially for measurements that are mandatory by law – e.g. the Medizinproduktegesetz for the protection of the patient – or defined in international standards,...

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