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Investigation of a set procedure for the stability of pressure control in the newly developed flow-control system at KRISS
MAPAN - Tập 24 - Trang 89-94 - 2009
Korea Research Institute of Standards and Science (KRISS) has assembled a new flow-control system (FCS-705) for the study of advanced applications and calibration of different types of vacuum gauges by comparison method. This report details the measurement of the outgassing rate of the main vacuum chamber by the pressure rate of rise method. Constant pressure was generated inside the vacuum chambe......
A Broadband Microwave Metamaterial Absorber with Octave Bandwidth
MAPAN - Tập 31 - Trang 299-307 - 2016
In this paper, a broadband metamaterial absorber has been presented for practical applications. The unit cell of the proposed structure comprises metallic patch of single circular split-ring imprinted on top surface of a metal-backed dielectric substrate. The geometrical dimensions of the structure have been optimized in such a way that the structure exhibits broadband absorptivity response of 9.1......
Improving the Measurement of Volume Fraction of Multiphase Fluids Based on Attenuation of Gamma Rays Without the Use of Artificial Intelligence
MAPAN - Tập 36 - Trang 869-874 - 2021
Nowadays, multiphase fluid flowmetry is of great importance in the industry. The most important parameter required for multi-phase fluid flowmeter is the volume fraction of each phase. In this study, three flow regimes (annular, stratified and homogeneous) for two-phase (liquid–gas) as well as three-phase (liquid–liquid–gas) to determine the volume fraction of phases with use gamma-ray attenuation......
Design, Construction and Calibration of a Triaxial Dynamometer for Measuring Forces and Moments Applied on Tillage Implements in Field Conditions
MAPAN - Tập 28 - Trang 119-127 - 2013
In this research, a dynamometer was designed, constructed and calibrated to measure the forces and moments applied on tillage implements. This dynamometer is able to measure the three orthogonal forces acting on the implement and the three moments acting around the orthogonal axes, up to a maximum force of 20 kN and a maximum moment of 20 kN m. The dynamometer uses two extended octagonal ring tran......
The uncertainty of parallel model coordinate measuring machine
MAPAN - Tập 26 - Trang 47-53 - 2011
The Stewart platform is one of 6-DOF (6 degrees of freedom) parallel mechanism. A parallel mechanism is a mechanism to connect six actuators in parallel between the base and the stage. It is necessary to calibrate the kinematic parameters that compose the mechanism in order to use the parallel mechanism as the coordinate measuring machine. Additionally, it is necessary to estimate the uncertainty ......
Realization of Negative Gauge Pressure Standard in the National Metrology Institute of Indonesia
MAPAN - - 2019
Accurate negative gauge pressure measurement is the key factor for many scientific and industrial applications such as clean room technology, medical treatment, and pharmaceutical production. However, there are not much publications regarding to the technical guide when it comes to negative pressure measurement, although several comparison of negative gauge pressure has been performed in Europe. I......
Design and Evaluation of a 100 kN m Multi-function Torque Standard MachineAbstract This paper presents the design and evaluation of a Multi-function torque standard machine (MFTSM) capable of calibrating hydraulic torque wrenches, torque multipliers either concentric or nonconcentric up to 100 kN m, and torque transducers with regular or irregular bases up to 2.5 kN m, in clockwise and anticlockwise directions. The machine’s performance w... ...
MAPAN -
Optical Fiber-Based Intensity-Modulated Cost-Effective Small Lean Angle Measurement Sensor
MAPAN - Tập 36 - Trang 925-930 - 2021
In this article, an optical fiber-based intensity-modulated angle measurement sensor is demonstrated for the measurements of small angles in the range of − 100 to 100 arcmin. At the outset, using a step index multimode polymer optical fiber, reflection-based proximity sensor was developed and the response of it is plotted to identify the maximum response region. At this maximum response region, th......
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