CD Skripsi

Rancang Bangun Spektrofotometer Cahaya Tampak Menggunakan Motor Stepper Resolusi Tinggi

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UV-Vis spectrophotometers have been used widely and are commercially available. However, the weakness of the technique is that the price isrelatively expensive. Therefore, low-cost analytical instrument with high resolution are needed, especially visible light spectrophotometers. This research was carried out with a working principle that resembles a visible light spectrophotometer using simple tools and materials. The white light source produced by a LED hits a diffraction grating. Polychromatic light is converted into monochromatic light using a diffraction grating. The reflection angle is set using a 28BYJ-48 stepper motor that is able to move at an angle interval of 0.09°. The light spectrum is transmitted through a narrow gap into the sample of Potassium Dichromate (K2Cr2O7) and Potassium Permanganate (KMnO4) solutions at concentration of 25 ppm each and then forwarded to the light sensor TEMT6000. The maximum absorbance of the Potassium Dichromate solution occurred at an angle of 0° with a value of 0.9393, 1.105% different from the maximum absorbance value at the wavelength of 380 nm. The maximum absorbance of Potassium Permanganate solution 1.0969 occurred at an angle of 4.32°, 0.71% different from the maximum absorbance value at the wavelength of 525 nm. The advantages of this system can be seen in terms of automation of the movement of the high-resolution stepper motor, thereby increasing the efficiency of measurement by comparing every 0.09° angle of the stepper motor movement close to the value of 3-4 nm Wavelength.

Keywords: Visible Light Spectrophotometer, Diffraction Grating, Stepper Motor, Light Sensor, Angle displacement

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

1803110072

Penerbit

Pekanbaru : Universitas Riau FMIPA Fisika., 2025

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

1803110072

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Mutia

Versi lain/terkait

Lampiran Berkas

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