Filtern
Erscheinungsjahr
Dokumenttyp
- Beitrag zu einem Tagungsband (33)
- Zeitschriftenartikel (14)
- Beitrag zu einem Sammelband (8)
- Vortrag (4)
- Posterpräsentation (2)
Sprache
- Englisch (44)
- Deutsch (16)
- Mehrsprachig (1)
Schlagworte
- Behälterversagen (6)
- Consequences (5)
- Monitoring (5)
- Explosion (4)
- Auswirkungsbetrachtung (3)
- BLDC (3)
- Mobile Robot Olfaction (3)
- Motor control (3)
- PMSM (3)
- Sensor network (3)
Organisationseinheit der BAM
- 8 Zerstörungsfreie Prüfung (19)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (19)
- 1 Analytische Chemie; Referenzmaterialien (5)
- 1.9 Chemische und optische Sensorik (5)
- 2 Prozess- und Anlagensicherheit (4)
- 2.1 Sicherheit von Energieträgern (4)
- 2.2 Prozesssimulation (2)
- 3 Gefahrgutumschließungen; Energiespeicher (2)
- 3.0 Abteilungsleitung und andere (2)
- 7 Bauwerkssicherheit (2)
Eingeladener Vortrag
- nein (4)
A new calibration machine according to the
requirements given by ISO 14577-3 [1] was described in [2].
The results of the verification are reported in this paper. It is
shown that the calibration machine can be used as a national
standard for the materials parameter of the instrumented
indentation test.
The instrumented indentation test provides a versatile method to determine several materials parameter. In order to provide reference specimens, a calibration machine according to ISO 14577-3 is designed for the macro range. Using innovative technology, the new machine design may lead to a standard solution not only for calibration machines.
Effect and measurement of the machine compliance in the macro range of instrumented indentation test
(2010)
The contribution concerns the strong effect of the machine compliance in the upper macro range of the instrumented indentation test on hard materials. To achieve a minimum uncertainty in determination of the machine compliance the measurement and analysis needed for the determination are studied in detail. Based on the assumption that the hardness and/or the indentation modulus are force independent, four methods on the determination of the machine compliance are described. Experimental results of a commercial testing machine up to 2500 N and of a standard machine up to 200 N are analyzed. The results show that the uncertainty of the compliance is usually higher than requested for a precisely enough determination of hardness and further materials parameters. Especially for the calibration of reference materials with high hardness and/or Youngs modulus, the machine compliance should be limited in ISO 14577 part 3, 2003 [1].
Fiber-optic strain sensors are increasingly used in very different technical fields. Sensors are provided with specifications defined by the manufacturer or ascertained by the interested user. If deformation sensors are to be used to evaluate the long-term behavior of safety-relevant structures or to monitor critical structure components, their performance and signal stability must be of high quality to enable reliable data recording. The measurement system must therefore be validated according to established technical rules and standards before its application and after. In some cases, not all details of the complex characteristic and performance of applied fiber-optic sensors are sufficiently understood, or can be validated because of a lack of knowledge and methods to check the sensors' behavior. This contribution focusses therefore on the importance of serious validation in avoiding a decrease or even deterioration of the sensors' function. Methods for validation of applied sensors are discussed and should reveal weaknesses in validation of embedded or integrated fiber-optic deformation and/or strain sensors. An outlook to some research work that has to be carried out to ensure a well-accepted practical use of fiber-optic sensors is given.
In the present paper the development of a semi-automated device for long-term monitoring of gaseous ammonia is described. A sensor material was produced that changes its optical properties in the pres-ence of low concentrations of ammonia in air. The implementation into an electronic device enables precise, simple, economic and fast monitoring of low concentrations of harmful gases, like ammonia, and hence can help to improve the climate monitoring in livestock housing, barns or stables.