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Author

M.M. Narayanan

Bio: M.M. Narayanan is an academic researcher from Indira Gandhi Centre for Atomic Research. The author has contributed to research in topics: Ultrasonic sensor & Transducer. The author has an hindex of 3, co-authored 6 publications receiving 26 citations.

Papers
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Journal ArticleDOI
TL;DR: The thermal expansion bend of an SG tube shows that the bend does not have much influence on the mode and the multiple circumferential defects considered in the bend are detected with good sensitivity and excellent correlation between finite element simulation and experimental results.

18 citations

Journal ArticleDOI
TL;DR: An in-bore magnetostrictive transducer is designed for the steam generator tubes of Prototype fast breeder reactor for the generation of L(0,2) modes of frequencies in the range of 250-350 kHz and an excellent agreement is observed between the experimentally measured group velocities with those obtained from the dispersion curves in this frequency range.

18 citations

Journal ArticleDOI
TL;DR: In this article, an absolute methodology has been developed for quantification of misalignment of an ultrasonic transducer using a corner-cube retroreflector using amplitude-based and time-of-flight (TOF) based C-scans of the reflector.

6 citations

Journal ArticleDOI
TL;DR: In this article, an in-bore magnetostrictive transformer was used to examine the integrity of a steam generator tube of a nuclear reactor for smooth operation of steam generators.
Abstract: Periodic assessment of steam generator tubes of a sodium-cooled nuclear reactor is very crucial for smooth operation of steam generators. To examine the integrity, an in-bore magnetostrictive trans...

4 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a three-step optimization approach for the development of a magnetostrictive ultrasonic guided wave (MUGW) probe, namely optimization of the diameter and length of a permanent magnet (for bias) finite element modeling based, optimisation of the width of the transmitter and receiver coils of the probe by empirical modeling and optimization of the number of turns of the receiver coils by equivalent circuit models.
Abstract: Non-destructive examination of steam generator (SG) tubes of Fast Breeder Reactors is of paramount importance. The inspection needs to be carried out from the inner side of an SG tube due to the constraint in accessibility. Recently, the magnetostrictive ultrasonic guided wave (MUGW) technique has been proposed as an alternative for the inspection of SG tubes. As a commercial MUGW probe for small-diameter ferromagnetic tubes is not available, it needs to be designed and developed with optimum parameters. This paper proposes a three-step optimization approach for the development of a MUGW probe, namely optimization of the diameter and length of a permanent magnet (for bias) finite element modeling based, optimization of the width of the transmitter and receiver coils of the probe by empirical modeling and the optimization of the number of turns of the transmitter and receiver coils by equivalent circuit models. A MUGW probe is fabricated and tested experimentally to validate the optimized parameters. Experiments show the validity of the approach in terms of generation, long-range propagation (47.6 m) of L(0,2) mode at 300 kHz, and the required sensitivity (multiple 10% wall thickness deep uniform wall loss circumferential grooves) in SG tubes.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: An in-bore magnetostrictive transducer is designed for the steam generator tubes of Prototype fast breeder reactor for the generation of L(0,2) modes of frequencies in the range of 250-350 kHz and an excellent agreement is observed between the experimentally measured group velocities with those obtained from the dispersion curves in this frequency range.

18 citations

Journal ArticleDOI
TL;DR: The proposed physics-based framework can be used to efficiently perform multiple analyses considering different numbers and locations of welds, different excitation signals or to investigate the effects of changes in parameters such as transducer geometry, or material property variations caused by temperature fluctuations.

15 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed a multi-objective optimization technique for the joint optimization of actuator and sensor placement for a network with Fibre Bragg grating (FBG) sensors.

13 citations

Journal ArticleDOI
TL;DR: In this paper , the authors developed a multi-objective optimization technique for the joint optimization of actuator and sensor placement for a network with Fibre Bragg grating (FBG) sensors.

12 citations

Journal ArticleDOI
TL;DR: In this article, the applicability of a nondestructive method using microwaves to the detection of multiple pipe wall thinning defects was investigated, where a single full circumferential defect was introduced into a straight pipe of 19mm inner diameter, and the effect of the defect on transmitted waves was investigated.

12 citations