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All Journal Science and Technology Indonesia Journal of Science and Applicative Technology Jurnal Teori dan Aplikasi Fisika Newton-Maxwell Journal of Physics
Satria, Eko
1 Department Of Physics, Institut Teknologi Sumatera 2 Research And Innovation Center For Disaster Mitigation And Early Detection Of Forest Fires, Institut Teknologi Sumatera, Lampung, Indonesia
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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Journal : Newton-Maxwell Journal of Physics

 1 
Development of a New Data Processing System for Increasing the Accuracy of a Levitation Mass Method (LMM) based Measurement Eko Satria; Hendro Hendro; Yusaku Fujii; Mitra Djamal
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1068.817 KB) | DOI: 10.33369/nmj.v2i1.15189

Abstract

Levitation Mass Method (LMM) is the method as a material tester to evaluate the mechanical response of general objects against impact forces. In this method, a mass is made to collide with material to be tested and the impulse, i.e. the time integration of the impact force, is measured highly accurately as a change in momentum of the mass. To realize linear motion with sufficiently small friction acting on the mass, a pneumatic linear bearing is used. The inertial force acting on the mass is calculated from the velocity of the mass. The velocity is determined, highly accurately by means of measuring the Doppler shift frequency of a laser light beam reflected on the mass using an optical interferometer. To determine the Doppler frequency shift for LMM data processing, the method for estimating the frequency is necessary. Several methods have been developed to estimate the frequency for the LMM data processing with high accuracy, i.e. Zero-Crossing Average Method (ZAM), Zero-Crossing Fitting Method (ZFM), Sine Wave Fitting, and Zero-crossing Sine Wave Fitting. All methods realized using the zero-crossing point of the waveform obtained from the digitizer. A better method to estimate frequency on the digitized waveform will enable higher precision for a more accurate result. In this research, a new method that can improve the accuracy has been developed. The program was developed using data segmentation to obtain the frequency of the digitized waveforms. The developed program has the smallest error ( 1,98 X 10^-10 for N= 200) compare to other methods (2,31 X 10-3 for ZAM; 1,10X10-3 for ZFM; and 8,69 X10-4 for Zero-crossing Sine Wave Fitting).
Preliminary research: Gas mixture flowrate detector based on acoustic measurement Melany Febrina; Eko Satria; Mitra Djamal
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (581.487 KB) | DOI: 10.33369/nmj.v2i1.15198

Abstract

In preliminary research, a system for detecting the flow rate of the gas mixture (N2 and CO2) has been successfully built using acoustic measurements. This detector consists of a speaker as a transmitter of ultrasonic waves, and 3 microphones as a receiver of the ultrasonic waves. The quantity measured in this detection system test is the phase difference of the ultrasonic waves captured by the left and right microphones. The flow rate of the gas mixture will affect the phase difference value between the left and right microphones. With the increase of the flow rate of the gas mixture, the phase difference between the two microphones will increase. The flowrate range tested was between 0 and 0.8 l/min, with a concentration of 20% CO2 in the gas mixture of N2 and CO2. In testing this detection system, the absolute error is 2,4 10-2 l/min.
Co-Authors Hendro Hendro Heru Asyubi Martin Liess Martin Liess Melany Febrina Mitra Djamal Mitra Djamal Mitra Djamal Mitra Djamal Tri Siswandi Syahputra Wahyu Srigutomo Wahyu Srigutomo Yusaku Fujii