One of standard measuring device used in legal metrology is a vertical storage tank (also known as cylindrical tank) which is a standard measuring tank having a circular cross section and stands on a solid and fixed foundation. To maintain the truth value of a vertical storage tank, a calibrating and re-calibrating process must be carried out. Measuring instruments used in the calibrating and recalibrating process currently have several drawbacks, such as unaffordable prices and impractical use. In this study a cylinder tank volume measurement system was made by utilizing a laser distance gauge. The system using the travel time measurement principle in measuring the radius and height of the vertical storage tank to obtain the value of tank volume. To validate the system a miniature prototype of a vertical storage tank with an actual radius of 2.021 m and a height of 6.083 m was used. The instrument is positioned close to the center point of the vertical storage tank to measure its radius and height. The measuring tool rotates 360° to take 200 measurement data. From the experiment the instrument obtained the average volume measurements with an error of 3.087% and 3.283%.
Wrinkle is one of skin properties used to indicate aging or environment damage in human body. This feature can be assessed through contact and non-contact methods. Dermatology industry often utilizes tools such as dermatoscopy, however it lacks the ability to yield wrinkle's depth and requires contact with skin, which are not preferable because possibility of deforming skin's natural texture. These lead to the development of digital fringe profilometry which utilize phase-shifted fringes being projected to the skin. This method can satisfy both wrinkle's depth and non-invasive measurement.
A novel system of digital fringe profilometry technique is presented, which used newly improved camera technology preferred by the dermatological industry and a projector, both are commercially available, with new configuration suitable for skin measurement. The system is configured with certain height and angle to respectively project fringes and obtain images. Images will later be processed using phase shifting interferometry (PSI) and global phase unwrapping. The processing system will produce wrapped phase and absolute phase value. In order to prove system's feasibility, experiment was done by sampling two areas from three fingers. Quantitative analysis was done through statistical paired T-Test to see the system ability to acknowledge significant difference of two groups' skin topographic condition. Based on the T-Test, P value that was obtained is 0.003915, which concluded that the system is capable of quantifying two different skin topographic conditions and provide significantly different results.
A study on development of non destructive and low cost device has been conducted to predict cavendish banana ripening stage by using visible lights reflectance method. The system uses green (500-560 nm, peak at 533 nm), orange (580-610 nm, peak at 597 nm), and red (600-650 nm, peak at 632 nm) lights which has high corellation to spectral analysis by spectrophotometer at 0.91, 0.76 and 0.83 for red, orange and green lights respectively. A classification of ripening stages of banana has been made based on the lights reflectance of peel. The highest accuracy is obtained by the red light at 100%, 92%, 33% and 75% for predictions of stage 4, 5, 6 and 7 respectively compared to visual assessment of standard color chart.
Load and age of rails can result in problems such as breakage, depletion, and expansion that can lead to accidents. Rail inspection has been done manually by operator tracing the rails by walking or riding a special inspection vehicle. These methods obviously are inefficient and inaccurate, as operators might be missing some of the defects. In this research depletion detection of rails are conducted by analyzing changes of the area as well as position shifting of laser spot on captured images by utilizing the triangulation principle. Accuracy and efficiency improvement of rail inspection are expected from this method. Prior calibration of the system was conducted using gauge blocks with thickness varying from 19 to 1 mm with 1 mm decrement. Area changes and position shifting of laser spot are later analyzed through image processing. The system was also implemented on R-54 rail type based on the calibration and later be compared to the manual measurement data. It was shown that the system can detect depletion in rail type R-54. The calibration result shows that the deviation percentage of the measurement of laser area are ranging from 11.41% to 13.48% while for the measurement of laser spot position shift is from 6.91% to 8.80%. Implementation on rail type R-54 shows the deviation percentages between proposed method and manual measurement are ranging from 1.52% to 10.04% for the area measurement, while for the position shifting ranged from 1.11% to 12.68%.
Conference Committee Involvement (1)
Third International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2018)
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