(021) 304 50 500 ext. 2738
3rd Floor, Liem Sioe Liong Building, Universitas Prasetiya Mulya BSD Campus
Product Design Engineering
Dr. Nurmalia is a faculty member of Product Design Engineering study programme at Universitas Prasetiya Mulya, Indonesia. Her expertise is in the testing and evaluation of engineering products and infrastructure, particularly in non-destructive testing and evaluation (NDT&E). Her work in the past 7 years focused on the development of technologies associated with NDT&E, specifically with ultrasonic evaluation techniques. Her latest research has focused on the application of ultrasonic guided waves for use in pipe inspection, which is also important for inspection of tubes, rods, or any plate structures. She also contributes to the development of an alternative transducer design, i.e. Electromagnetic Acoustic Transducer (EMAT).
In the mean time, she is starting to do research on quantitative inspection of tropical fruits. The research combines mechanical properties inspection, nondestructive inspection, as well as chemical inspection.
For more than 7 years, I have been involving in the application of ultrasonic wave for nondestructive testing and evaluation. The most common way to generate ultrasonic wave in the inspected material is by using piezoelectric transducer. In this way, the wave is generated inside the transducer and a couplant material (typically grease) is required to establish intimate contact with the specimen in order to enable the transmission of the wave into the specimen. This need for a couplant creates some problems and limits the inspection flexibility.
I have been developing an alternative transducer for ultrasonic wave generation, namely the electromagnetic acoustic transducer (EMAT). With this transducer, the wave is generated directly in the inspected specimen through an electromagnetic-acoustic transduction mechanism via an air gap. It does not require a couplant or any mechanical bonding with the specimen, providing the flexibility and higher speed of inspection. The presence of defect in a pipe will alter the propagating guided waves. Commonly, the inspection is based on the amplitude difference of the disturbed propagating waves. Unfortunately, this amplitude can be easily affected by the background noise and contacting condition between the transducer and the specimen. I have been proposing a new method for inspection based on a velocity change which is based on a traveling time measurement. This method should be more reliable than the amplitude based inspection.
In the mean time, I am starting to do research on quantitative inspection of tropical fruits. The research combines mechanical properties inspection, nondestructive inspection, as well as chemical inspection.