![]() How to estimate the differential time of flight accurately is a challenging problem in the area of ultrasonic flow measurement. The results of the bilateral comparison are presented. ![]() By taking advantage of a specially designed window chamber, it was possible to determine the magnitude of the errors introduced by the transducer pockets and to define, based on the findings, a procedure to perform a bilateral comparison between the hot water calibration facilities of the Physikalisch-Technische Bundesanstalt and the National Institute of Advanced Industrial Science and Technology. It was determined that the most relevant influence quantity besides the flow profile within the bulk flow is the effect caused by the transducer pockets in the meter body. The present paper describes the efforts performed while qualifying a time-of-flight ultrasonic flow meter as a transfer standard. To find a flow meter that is capable of reaching a reproducibility better than 0.05% requires bounding all involved influence quantities down to the required level. Design Patterns A design pattern is an outline of how to design a particular aspect of the software, especially one that recurs in different parts of the system.The quality of any laboratory intercomparison depends to a large extent on the performance of the used flow meter. In a distributed system, messages in a sequence diagram can represent messages on a wire in a self-contained application, they can represent function calls. For example, in a system that uses a database, associations in a class diagram might represent relations or foreign keys in the database, whereas in a system that is based on XML files, associations might indicate cross-references that use XPath. ![]() The selections that you make affect how you use and interpret the architectural model. In a large system, the configuration of hardware and software are strongly interrelated. These choices are frequently determined by quality of service requirements such as scale and flexibility, and can be made before the detailed requirements are known. Integration method choices, for example between an enterprise service bus or a point-to-point channel. ![]()
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