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Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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RANCANG BANGUN SISTEM DETEKSI POLA FRINJI UNTUK INTERFEROMETER MICHELSON Buanti, Eka; ', Minarni; Tambunan, Walfred
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Instrument used to precisely measure the wavelength of a laser light is known as a wavemeter. One of very important wavemeter parts is a fringe counting circuit. In this research a fringe counting circuit has been built and characterized using a Michelson Interferometer. The circuit system contained three parts i.e a current to voltage converter circuit for a photodiode, a TTL converter circuit, and a counting circuit. The circuits were characterized using two He-Ne laser with two different laser powers 1 mW and 5 mW which were used as the light source for a Pasco Michelson Interferometer. Two photodiodes with two different sensitive areas 100 mm2 and 7.5 mm2 were used. The research results showed that 1 mW Pudak He Ne laser resulted 2 µA for dark fringe and 8 µA for bright fringe when using 7.5 mm2 photodiode active area, then 3 µA for dark fringe and 400 µA for bright fringe when using 100 mm2 photodiode. The results for Meredith He Ne laser resulted 2 µA for dark fringe and 14 µA for bright fringe when using 7.5 mm2 photodiode, then 50 µA for dark fringe and 8000 µA for bright fringe when using 100 mm2 photodiode. The I toV converter which was designed produced voltage bigger than 5 V when using 100 mm2 photodiode. The counter circuit resulted 3.2 V TTL signal output for 200 mV TTL signal input with the same frequency.
PENGUKURAN NILAI PANJANG KOHERENSI DUA SUMBER LASER MENGGUNAKAN INTERFEROMETER MICHELSON Anggrainie, Dhiesta; ', Minarni; Emrinaldi, Tengku
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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One of the laser beam  unique properties is its coherence. Each  lasers  has  different coherence length. The coherence length of laser is very important in many photonic applications such as holography, spectroscopy,  and interferometry. The coherence length can be measured by an interferometer.  Measurement of coherence length of two HeNe lasers and two diode lasers has been done using a Michelson interferometer. Two HeNe lasers with same wavelength but from the different company and two diode lasers with different wavelength and  brands  were used.  The laser used were HeNe laser 632,8 nm  by Griffin  (laser I), HeNe laser 632,8 nm  by Pudak  (laser II), diode laser 638 nm(laser III) and diode laser 405 nm  (laser IV).  Interference fringes from  interferometer were  recorded  by  a  Thorlabs  CCD camera and processed using  ToupView  software  to determine the respective value of the maximum and minimum intensity  of each fringe pattern.  Data of the fringe pattern intensity were used  to calculate the visibility  (V)  and coherence length  (Lc)  of the lasers.  The results showed that Lc and deviation  of laser I was  (1,12±31,8× 10−3) mm,  laser II  was  (0,99±61,6× 10−3) mm,  laser  III  was(0,50±2,9× 10−3) mm and  laser IV was  (0,3  8±4,8× 10−3) mm, respectively .  The results also showed that the coherence lengths of the HeNe lasers were greater than the diode lasers.
SISTEM OPTIK INTERFEROMETER MICHELSON MENGGUNAKAN DUA SUMBER LASER UNTUK MEMPEROLEH POLA FRINJI Widamarti, Yayuk; ', Minarni; Ginting, Maksi
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Wavemeter could be built using an interferometer with two laser sources. In this  study, Michelson interferometer was built using two lasers which  were  He-Ne  laser and diode laser. Characteristics  of its fringe pattern were  analyzed based on  the laser power and beam size. The results showed that fringe pattern for laser He-Ne was  obtained at  arm length  12.5 cm x 12.5 cm with the  beam  height  from   optical  table of  11.7 cm. He-Ne laser used was  632.8 nm  in  wavelength    with the 5 mW  power  made by  Meredith instrument. The  diode laser  had wavelength  650 nm with the power  of  5 mW  made byRoithner. The output of He-Ne laser from the  interferometer system  had 0.3 mW, diode laser by  0.5 mW. The best  fringe pattern for both lasers was with visibilities  rangedfrom  0.63 and 0.098, and beam width of each laser  of 4.11 mm  for He-Ne laser and 4.30 mm x 4.26 mm for diode laser.
ANALISA PENGGUNAAN LENSA SILINDER UNTUK MENGUBAH BENTUK BERKAS LASER DIODA MENJADI BENTUK GARIS Mashuri, Muhammad; ', Minarni; ', Sugianto
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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A research on the application of cylindrical lenses to change beam shape of diode lasers from  eliptical to line shape has been conducted.  The beam characteristic of the lasers before and after using the lenses were analyzed by a calibrated photodiode and a CCD camera. The distance between CCD camera and the lenses were also varied to obtain the optimal length of the line.  The diode lasers used were  λ=830 nm Coherent diode laser with beam size 0,6 mm and 0,9 mm in x and y axis and  λ=638 nm Aixiz diode laser with beam size 1,2 mm and 1,6 mm in x and y axis were used.  Three  cylindrical lenses with three  different focal length were used whice were 50 mm, 75 mm, and 95 mm respectively.  The results showed that the maximum line lengths (L) of  λ=830 nm diode laser were 1,86 mm, 2,55 mm, and 1,39 mm respectively. For the  λ=638 nm diode laser the maximum line length (L) were 3,74 mm, 4,32 mm, and 3,87  mm respectively to the same focal length. The result also showed that the bigger λ produced the shorter line (L) than the smaller λ. For the biggest focus need the longest distance (z) to produce the longest line.
ANALISIS FENETIK TANAMAN KARET (Hevea brasiliensis (Willd. ex A. Juss) Mull. Arg.) BERDASARKAN PENANDA ISOZIM DI LIMA KABUPATEN SENTRA PERKEBUNAN KARET RIAU Mayasari, Ivo; ', Fitmawati; ', Minarni
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Many kinds of rubber plants (Hevea brasiliensis (Willd. ex A. Juss) Mull. Arg.)has been cultivated in Riau Province. Phenetic analysis of rubber plants can giveinformation about their relationship. Study to obtain information about the relationshipamong rubber plants which are grown in 5 rubber plantation centers in Riau wasconducted based on isozyme markers. A total of 15 trees had been studied. The sampleswere taken from 5 regencies i.e. Bengkalis, Meranti, Kuantan Singingi, Kampar, andRokan Hulu using an exploration method. Four enzymes (PER, EST, ACP, and AAT)were used for similarity and clustering analysis using NTSys program version 2.02. Theresult of this research showed 19 polymorphic bands, 9 bands from PER, 5 bands fromEST, 2 bands from ACP, and 3 bands from AAT enzyme. The similarity analysis of 15individuals showed that the similarity coefficient ranged from 0.47-1. The clusteringresult showed that all of individuals were grouped at the coefficient of 0.59. Most of thesamples were grouped together based on the band similarity. However, all of samplescollected from Bengkalis, as well as Kuantan Singingi, formed a cluster due to the highband similarity.
ANALISA SPEKTRUM DAN PANJANG KOHERENSI BEBERAPA JENIS LAMPU MENGGUNAKAN SPEKTROSKOP PRISMA DAN INTERFEROMETER MICHELSON ', Maria; ', Minarni; Tambunan, Walfred
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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There are three types of commercial lamps available today which are incandescent lamp (light bulb) , fluorescent lamp or Compact Fluorescent Lamp (CFL), and Light Emitting Diode (LED). The three types of lamps can be distinguished by some aspects such as their efficiency, color spectrum, and coherence. This research aimed to obtain and differentiate the color spectrum and coherence of the three kind of lamps. The spectrums were obtained using a prism spectroscope while the coherence levels were analyzed using a Pasco Michelson interferometer. The samples were the three types of lamps with the same power of 5 Watt and CFL lamps with three different power of 5 Watt, 26 Watt, and 45 Watt. The spectrum and fringe pattern of the lamps were captured using a CCD camera and processed by imageJ software. The research results showed that the color spectrum of light bulb and LED produced a continuous spectrum. While the light of light bulb was dominant at red color and LED light at blue color. CFL light spectrums were partly continuous and dominant also in blue color. The different power of CLF produced different brightness, however the spectrum was still dominant in blue. Coherence of the three type of lamps was different as shown in the fringe pattern obtained. CFL produced fringe pattern with high visibility which showed higher coherence than that of LED and light bulb.