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Ultrasonic Metrology is of fundamental importance in industry and trade – not only from the point of view of the consumer but also for those involved in manufacturing. Both groups must have confidence in the accuracy and reliability of the measurements upon which they depend. To ensure the accuracy of measuring instruments while performing Ultrasonic Non-destructive Evaluation(NDE)in the manufacturing process, it is essential that the equipments in use are periodically calibrated against more accurate standards. This in turn demands that their calibration is traceable to even more accurate national measurement standards at the national level and, eventually, at the international level. When these various levels of calibration have been documented, a chain of traceable calibrations is created. It is this chain of traceability that gives confidence in accuracy and reliability in measurements.NPLI acts as NMI of India. It is one of the earliest national laboratories set-up under the Council of Scientific and Industrial Research (CSIR), New Delhi. The main aim of the laboratory is to strengthen and advance physics-based research and development for the overall development of science and technology in the country. Sinceall the measurements need to be traceable to National Standards for their validity. It sohappens that this work is carried out at NPLI which is the custodian of Indian nationalstandards as NMI of India, hence ultrasonic reference liquid would find application as novel way of calibration standard. Also, it can be used in industries and R and D laboratories to help them in establishing the traceability chain. In the absence of a reference liquid, industries approach the NMIs, NPLI in case of India, to maintain the traceability chain. This is a tedious task for both industry and also increase the workload at NPLI which would have been otherwise completed by some accredited laboratory. In a nutshell, Ultrasonic Velocity Reference Liquid, still in infacy, promises its enormous applications in R and D measurements and industries.
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