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All Journal Komunikasi Fisika Indonesia Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Minarni '

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Author-ID : 2979939

Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Physics

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KOREKSI BENTUK BERKAS CAHAYA LASER DIODA MENGGUNAKAN LENSA SILINDER Ahmad Fauzi; Minarni '
Komunikasi Fisika Indonesia Vol 11, No 8 (2014)
Publisher : Universitas Riau

Diode laser is kind of laser which uses semiconductor material as the gain medium. Diode laser is preferred insome applications because it is less expensive, compact, available in wide range of wavelength and power.Unfortunately, diode laser also has some disadvantages compared to other types of laser. The material shape oflaser diode produces unsymmetrical beam shape whereas most laser applications need a circular beam.Correction of the beam shape can be done using some optics such as anamorphics prism pairs, cylindrical lenspairs and optical fibers. In this study, the beam shape of two diode lasers are corrected by a pair of cylindricallens and measured using a photodiode and CCD camera. The first diode laser is a coherent 830 nm diode whichhas beam size in x and y axis respectively 0.65 mm, 1.35 mm. The second diode laser is aixiz 638 nm diodelaser which has beam size in x and y axis respectively 1.34 mm, 3.67 mm. The first diode laser was bestcorrected using a pair of cylindrical with a focal length of 75 mm and -12.7 mm, the distance between the lens is7.15 cm which produced beam size in x and y axis respectively 1.38 mm and 1.51 mm. The second diode laserwas best corrected using a pair of cylindrical lens with focal length 95 mm and -19 mm, the distance betweenthe lens is 8.1 cm which produced beam size in x and y axis respectively 1.95 mm and 2.2 mm.

STUDI KELAYAKAN PENGGUNAAN SEL SILIKON SEBAGAI PENGUBAH ENERGI MATAHARI MENJADI ENERGI LISTRIK Walfred Tambuhan; Maksi Ginting; Minarni '
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Telah dilakukan penelitian tentang “Studi Kelayakan Penggunaan Sel Silikon sebagai Pengubah Energi Matahari menjadi Energi Listrik” dengan metoda eksperimen. Eksperimen dilakukan dengan cara merangkai dioda silikon selinder ke rangkaian bentuk paralel dan bentuk seri pada pelat rangkaian PCB, kemudian rangkaian dimasukkan kedalam suatu kotak terbuat dari kayu yang diisolasi dengan isolator kardus. Kotak tersebut ada yang dibuat terbuka tanpa pelat kaca dan ada yang dibuat tertutup dengan pelat kaca kemudian diletakkan ke tempat yang bebas cahaya matahari jatuh dengan mengarahkan dioda silikon tegak lurus terhadap cahaya matahari jatuh lalu diamati arus listrik yang dihasilkan dioda silikon setiap selang waktu 10 menit. Hasil yang diperoleh, arus listrik dihasilkan bernilai maksimum untuk dioda sambungan paralel dan terbuka tanpa penutup pelat kaca sebesar 102,9 x 10-2 milli ampere dengan energi listrik rata-rata yang dihasilkan 35,2 x 10-3 Joule pada temperatur 39oC sedangkan arus listrik minimum dihasilkan dari rangkaian dioda bentuk seri tertutup dengan pelat kaca sebesar 21 mikro ampere dengan energi listrik rata-rata dihasilkan sebesar 51 x 10-5 Joule. Dari hasik-hasil tersebut yang lebih bagus dan lebih layak digunakan untuk mengubah energi matahari menjadi energi listrik adalah dioda silikon bentuk sambungan paralel terbuka tanpa memakai penutup pelat kaca.

ANALISA PENGARUH PANJANG GELOMBANG SUMBER CAHAYA PENGINDUKSI FLUORESENSI TERHADAP FLUORESENSI KLOROFIL PADA DAUN BAYAM YANG DIPENGARUHI VARIASI SINAR MATAHARI Fitria Asriani; Minarni '
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Chlorophyll fluorescence imaging and spectroscopy can be used to detect early abnormalities on plants, which are caused by plant diseases, harsh environments, and intentional treatments. Development in chlorophyll imaging and spectroscopy which is economical, low cost, and portable are needed in attempts to explore fluorescence spectrum as markers for diseases and environmental stresses on plants. In this research, a fluorescence imaging system was built using LEDs with three variations in wavelengths i.e. 450 nm; 525 nm; and 680 nm, and a 3 Mega Pixel CMOS camera. The LED light was used as an excitation beam to induce chlorophyll fluorescence of spinach leaves. Relation between the LED wavelengths and the fluorescence intensities of the spinach leaves were investigated. The samples were Spinach leaves from Amaranthus tricolor Spinach plants grown under two variations of sunlight intensities. Two variations of the intensities were about 90% using plastic as the cover and 40% using plastic plus paranet. Relation between the sunlight intensity and fluorescence intensity was also investigated. The fluorescence intensity of the leaves were measured from RGB plot using Image-J software. The research results show that fluorescence intensity of the samples without paranet were higher than those using paranet. This is possibly caused by chlorophyll contents which is higher on plants without paranet. The excitation wavelength that showed the highest different fluorescence intensity was 680 nm, which showed 6,3% the difference in fluorescence intensity using and without paranet while for other excitation wavelength were 0,4% and 1,7% for 450 nm and 525 nm respectively.

ANALISA PENGARUH INTENSITAS SUMBER CAHAYA PENGINDUKSI FLUORESENSI TERHADAP INTENSITAS FLUORESENSI KLOROFIL PADA DAUN BAYAM MENGGUNAKAN METODE FLUORESCENCE IMAGING Minarni '; Iswanti Sihaloho
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Chlorophyll fluorescnce imaging and spectroscopy has been developed intensively during last decade to detect early symptoms of plant diseases and effects of environtmental stresses on plants. An economical, portable, and remote sensing system is needed for those purposes. In this research, a fluorescence imaging system was built using a LED with 465 nm wavelength, some neutral density filters and a 3 Mega Pixel CMOS camera. The intensities of LED light were varied using 5 different optical densities of the neutral density filters which were represented by their optical power after filtered 5,0 mW; 3,3 mW; 2,0 mW; 1,5 mW; and 0,7 mW respectively. This system was used to investigate the relation between the intensity of LEDs as a fluorescence inducer and the fluorescence intensity of spinach leaves grown under two variations of sunlight intensity. The variations were about 90% using plastic cover and 40% using plastic plus paranet cover. The spinach plant was Amaranthus tricolar varitas. The differences between chlorophyll fluorescence intensity of the spinach leaves for both treatment were also investigated. The fluorescence intensities were found from RGB plot using ImageJ software. The reseach results showed that intensity of LED light influenced the fluorescence intensity resulted on the spinach leaves. The higher the intensity of LED, the higher the fluorescence intensity. The spinach leaves grown without paranet provided higher fluorescence intensity however, the difference between both treatments was seen higher when LED intensity was the lowest which was about 41,6% difference.

Co-Authors Ahmad Fauzi Dhiesta Anggrainie Eka Buanti Fitmawati ' Fitria Asriani Iswanti Sihaloho Ivo Mayasari Maksi Ginting Maria ' Muhammad Mashuri Sugianto ' Tengku Emrinaldi Walfred Tambuhan Walfred Tambunan Yayuk Widamarti

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