"[
ABSTRAKDalam penelitian ini, telah dibuat sebuah alat ukur yang dapat mengukur
panjang gelombang cahaya. Dengan memanfaatkan fenomena sifat cahaya,
penulis ingin mengetahui besar nilai panjang gelombang dan pola distribusi
intensitas difraksi pada cahaya yang melewati kisi difraksi apakah sesuai dengan
teori berdasarkan referensi. Sumber cahaya yang digunakan berupa sinar laser
merah monokromatik dan polikromatik yang menghasilkan warna RGB serta
lampu merkuri. Kisi difraksi dan sumber cahaya digerakkan dengan motor DC
yang dilengkapi rotary encoder untuk menentukan posisinya. Semua pergerakan
alat ini dikendalikan oleh program LabVIEW National Instrument dan
pengolahan gambar dilakukan dengan program Vision Assistant. Hasil yang
diperoleh dalam penelitian ini yaitu sumber cahaya merah monokromatik
dengan kisi difraksi 300 garis/mm, panjang gelombang cahaya yang dihasilkan
(640 - 676) nm dengan besar kesalahan relatif sebesar 0,32 %. Warna biru
dengan kisi 600 garis/mm, panjang gelombang cahaya yang dihasilkan (454 -
475) nm, dengan besar kesalahan relatif sebesar 0,31 %. Warna hijau dengan
kisi 600 garis/mm, panjang gelombang cahaya yang dihasilkan (524 - 547) nm,
dengan besar kesalahan relatif sebesar 0,19 %. Warna merah dengan kisi 600
garis/mm, panjang gelombang cahaya yang dihasilkan (654 - 697) nm, dengan
besar kesalahan relatif sebesar 0,34 %. Semakin besar orde difraksi maka
semakin lemah tingkat intensitas yang dihasilkan.
ABSTRACTIn this research, has created a measuring instrument which can measure
light intensity distribution pattern. By exploiting phenomenon the nature of
light, the author would like to know the value of wave l ength and the
intensity distribution of the diffraction pattern on laser light that passes through a
diffraction grating so it can be appropriate to reference theory. The source of
light use red of monochromatic, polychromatic light which produce RGB color
and mercury lamp. Grating diffraction and source of light are moved by DC
motor with go forward and go back moving, which next by rotary encoder
change distance become counter in partition. The all of these moving are manage
by LabVIEW National Instrument and processing of image is executed of
Vision Assistant program. The result of research is red monochromatic with
width diffraction grating 300 lines/mm, is produced wave length of light (640 -
676) nm with relative error 0,32 %. For blue color with width diffraction grating
600 lines/mm, is produced wave length of light (454 - 475) nm with relative
error 0,31 %. For green color with width diffraction grating 600 lines/mm, is
produced wave length of light (524 - 547) nm with relative error 0,19 %. For red
color with width diffraction grating 600 lines/mm, is produced wave length (654
- 697) nm with relative error 0,34 %. The greater order of diffraction then the
less level of intensity was resulted.;In this research, has created a measuring instrument which can measure
light intensity distribution pattern. By exploiting phenomenon the nature of
light, the author would like to know the value of wave l ength and the
intensity distribution of the diffraction pattern on laser light that passes through a
diffraction grating so it can be appropriate to reference theory. The source of
light use red of monochromatic, polychromatic light which produce RGB color
and mercury lamp. Grating diffraction and source of light are moved by DC
motor with go forward and go back moving, which next by rotary encoder
change distance become counter in partition. The all of these moving are manage
by LabVIEW National Instrument and processing of image is executed of
Vision Assistant program. The result of research is red monochromatic with
width diffraction grating 300 lines/mm, is produced wave length of light (640 -
676) nm with relative error 0,32 %. For blue color with width diffraction grating
600 lines/mm, is produced wave length of light (454 - 475) nm with relative
error 0,31 %. For green color with width diffraction grating 600 lines/mm, is
produced wave length of light (524 - 547) nm with relative error 0,19 %. For red
color with width diffraction grating 600 lines/mm, is produced wave length (654
- 697) nm with relative error 0,34 %. The greater order of diffraction then the
less level of intensity was resulted.;In this research, has created a measuring instrument which can measure
light intensity distribution pattern. By exploiting phenomenon the nature of
light, the author would like to know the value of wave l ength and the
intensity distribution of the diffraction pattern on laser light that passes through a
diffraction grating so it can be appropriate to reference theory. The source of
light use red of monochromatic, polychromatic light which produce RGB color
and mercury lamp. Grating diffraction and source of light are moved by DC
motor with go forward and go back moving, which next by rotary encoder
change distance become counter in partition. The all of these moving are manage
by LabVIEW National Instrument and processing of image is executed of
Vision Assistant program. The result of research is red monochromatic with
width diffraction grating 300 lines/mm, is produced wave length of light (640 -
676) nm with relative error 0,32 %. For blue color with width diffraction grating
600 lines/mm, is produced wave length of light (454 - 475) nm with relative
error 0,31 %. For green color with width diffraction grating 600 lines/mm, is
produced wave length of light (524 - 547) nm with relative error 0,19 %. For red
color with width diffraction grating 600 lines/mm, is produced wave length (654
- 697) nm with relative error 0,34 %. The greater order of diffraction then the
less level of intensity was resulted., In this research, has created a measuring instrument which can measure
light intensity distribution pattern. By exploiting phenomenon the nature of
light, the author would like to know the value of wave l ength and the
intensity distribution of the diffraction pattern on laser light that passes through a
diffraction grating so it can be appropriate to reference theory. The source of
light use red of monochromatic, polychromatic light which produce RGB color
and mercury lamp. Grating diffraction and source of light are moved by DC
motor with go forward and go back moving, which next by rotary encoder
change distance become counter in partition. The all of these moving are manage
by LabVIEW National Instrument and processing of image is executed of
Vision Assistant program. The result of research is red monochromatic with
width diffraction grating 300 lines/mm, is produced wave length of light (640 -
676) nm with relative error 0,32 %. For blue color with width diffraction grating
600 lines/mm, is produced wave length of light (454 - 475) nm with relative
error 0,31 %. For green color with width diffraction grating 600 lines/mm, is
produced wave length of light (524 - 547) nm with relative error 0,19 %. For red
color with width diffraction grating 600 lines/mm, is produced wave length (654
- 697) nm with relative error 0,34 %. The greater order of diffraction then the
less level of intensity was resulted.]"
Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2014
