An enhanced laser beam deflection measurement system for refractive index gradient and diffusivity

Soedarmawan, Levin; Hifzhi, Affan; Pambudi, Syukur; Aman, Mohamad Yusri; Sudarmaji, Arief; Handoko, Djati

doi:10.1109/issimm.2017.8124264

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Introduction The Wiener method for diffusivity measurement involves deflecting the laser beam due to light refraction on the inter-diffusion area of two fluids with different refractive indexes. This method has shown a high level of agreement with literature in previous studies, especially for liquids with a mass of less than hundreds amu and a small molecule-sized order of Angstrom (atomic mass unit) [1]- [6]. Palm oil has a composition and structure that is quite complicated and has become one of the primary raw materials for biodiesel production, which is an alternative biofuel for diesel engines and cooking, so challenging to be tested [7]- [14].…”

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confidence: 75%

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Determination of Diffusion Coefficient of Palm Oil in n-Hexane Using Laser Deflection Method and Image Processing

Aman

Handoko

Sudarmaji

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Determination of diffusion coefficient using the Wiener method has shown a high level of agreement with literature in previous studies, particularly for liquids with a mass of less than hundreds of amu and a small molecule-sized order of Angstrom (atomic mass unit). This method involves a laser beam deflection and refraction phenomenon on the inter-diffusion zone of two fluids with different refractive indexes. Palm oil, vegetable oil with a composition and structure that is quite complicated and size relatively large molecule, has abundantly available and has become one of the primary raw materials for biodiesel production and cooking. This study used the method to examine the diffusivity of palm oil in n-hexane, which is still rare and hard to find, so challenging to be studied. A camera is used to catch the trace of a deflected laser beam on a screen after it passes through a diffusion cell in the measurement. This image was then corrected, made grey, and digitized to extract the laser image coordinate data. An averaging window algorithm is used in digitizing. The digitized results are then processed to calculate the diffusion coefficient. Measurements were made three times to test the consistency of the results. Camera and digitizing techniques are used here to speed up and facilitate measurement. The measured value of diffusion coefficient of palm oil in n-hexane is 2.18×10-4 ± 5.05×10-5 cm2/minute. The results showed consistency in measure, i.e., precision with a maximum error range of 10.6%, but not good suitability value with literature data, i.e., accuracy was less than 10%. These results found that the measurement system that applied the laser deflection method and the image processing of averaging window could not measure the diffusion coefficient of large molecules and complexes such as palm oil quite well.

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confidence: 75%

“…Experimental The measuring method is based on Wiener's experiment, and the detailed theoretical formulation for the experimental setup can be found in other articles. [1], [2], [20], [21]. A unique curve is generated when an oblique laser beam is passed through the inter-diffusion layer of two liquids.…”

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confidence: 99%

Determination of Diffusion Coefficient of Palm Oil in n-Hexane Using Laser Deflection Method and Image Processing

Aman

Handoko

Sudarmaji

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The influence of particle size to diffusivity of nanogold particles based on Brownian motion

Zulfahmi

Handoko

Prajitno

et al. 2020

J. Phys.: Conf. Ser.

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Diffusivity calculation has been conducted by many researchers in various methods. One ingenious and sample-efficient way to determine the diffusivity is the examination under the microscope by using microbead random movements, called Brownian motion, through the footage of its movements. This study was conducted to observe the diffusivity of nanogold particles towards the use of various microbead sizes. The one-micron-sized microbead was mixed into nanogold particles solution and prepared onto slide glass, so was the three micron-sized and five-micron-sized microbead. The footage of microbead movements for each size is then tracked and processed using MATLAB image processing to obtain the mean square displacement (MSD) of the microbead and then fitting it to time to find the sample diffusivity. As a result, the nanogold diffusivity observed using one-micron, three-micron, and five-micron-sized microbead is respectively around 5.66 x 10−17 cm2s−1 , 3.45 x 10−17 cm2s−1 , and 1.71 x 10−17 cm2s−1 . Thus, the nanogold diffusivity observed using one-micron-sized microbead is greater than three-micron and five-micron-sized microbead, which can be concluded that the bigger of microbead size used, the smaller diffusivity obtained.

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Gray Scale and Edge Detecting Method To Extract Raw Data in The Diffusivity Measurement System

Handoyo

Purwantiningsih

Maulidah

et al. 2018

2018 3rd International Seminar on Sensors, Instrumentation, Measurement and Metrology (ISSIMM)

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An enhanced laser beam deflection measurement system for refractive index gradient and diffusivity

Cited by 3 publications

References 7 publications

Determination of Diffusion Coefficient of Palm Oil in n-Hexane Using Laser Deflection Method and Image Processing

Determination of Diffusion Coefficient of Palm Oil in n-Hexane Using Laser Deflection Method and Image Processing

The influence of particle size to diffusivity of nanogold particles based on Brownian motion

Gray Scale and Edge Detecting Method To Extract Raw Data in The Diffusivity Measurement System

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