Resistor foto: Perbedaan revisi

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{{Infobox komponen elektronik
[[Berkas:LDR.jpg|thumb|LDR]]
|nama_komponen=Resistor foto
|foto=[[Image:LDR.jpg|225px]]
|judul_foto=
|tipe=[[Resistor]]
|kategori=[[Transduser]]
|prinsip_kerja=Pergerakan foton
|komponen_sejenis=[[Transistor foto]], [[dioda foto]]
|penemu=
|pembuatan_pertama=
|simbol=[[Image:Light-dependent resistor schematic symbol.svg|128px]]
|susunan_kaki=2 kaki
}}
'''Resistor peka cahaya''' atau '''fotoresistor''' adalah [[komponen elektronik]] yang [[resistansi listrik|resistansinya]] akan menurun jika ada penambahan intensitas cahaya yang mengenainya. Fotoresistor dapat merujuk pula pada '''''light-dependent resistor''''' (LDR), atau '''fotokonduktor'''.
 
Fotoresistor dibuat dari [[semikonduktor]] beresistansi tinggi. Jika cahaya yang mengenainya memiliki [[frekuensi]] yang cukup tinggi, [[foton]] yang diserap oleh semikonduktor akan menyebabkan [[elektron]] memiliki energi yang cukup untuk meloncat ke [[pita konduksi]]. Elektron bebas yang dihasilkan (dan pasangan [[lubang elektron|lubangnya]]) akan mengalirkan listrik, sehingga menurunkan [[resistansi listrik|resistansinya]].
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A photoelectric device can be either intrinsic or extrinsic. An intrinsic semiconductor has its own charge carriers and is not an efficient semiconductor, eg. silicon. In intrinsic devices, the only available electrons are in the [[valence band]], and hence the photon must have enough energy to excite the electron across the entire [[bandgap]]. Extrinsic devices have impurities added, which have a ground state energy closer to the conduction band — since the electrons don't have as far to jump, lower energy photons (i.e. longer wavelengths and lower frequencies) are sufficient to trigger the device. If a sample of silicon has some of its atoms replaced by phosphorus atoms(impurities), there will be extra electrons available for conduction. This is an example of an extrinsic semiconductor.
 
== Sel kadmium sulfida ==
[[Cadmium sulphide]] or cadmium sulphide (CdS) cells rely on the material's ability to vary its resistance according to the amount of light striking the cell. The more light that strikes the cell, the lower the resistance.
Although not accurate, even a simple CdS cell can have a wide range of resistance from less than 100 Ω in bright light to in excess of 10 MΩ in darkness. The cells are also capable of reacting to a broad range of frequencies, including [[infrared]] (IR), visible [[light]], and [[ultraviolet]] (UV). They are often found on street lights as automatic on/off switches. They were once even used in heat-seeking [[AIM-9 Sidewinder#Architecture|missiles]] to sense for targets.
 
Fotoresistor dibuat dari [[semikonduktor]] beresistansi tinggi. Jika cahaya yang mengenainya memiliki [[frekuensi]] yang cukup tinggi, [[foton]] yang diserap oleh semikonduktor akan menyebabkan [[elektron]] memiliki energi yang cukup untuk meloncat ke [[pita konduksi]]. Elektron bebas yang dihasilkan (dan pasangan [[lubang elektron|lubangnya]]) akan mengalirkan listrik, sehingga menurunkan [[resistansi listrik|resistansinya]].
==Aplikasi==
Photoresistors come in many different types. Inexpensive cadmium sulphide cells can be found in many consumer items such as [[camera]] [[light meter]]s, clock radios, security alarms, [[street lights]] and outdoor clocks. They are also used in some dynamic compressors to control gain reduction. At the other end of the scale, [[germanium|Ge]]:[[copper|Cu]] photoconductors are among the best far-[[infrared]] detectors available, and are used for [[infrared astronomy]] and [[infrared spectroscopy]].
 
==Lambang rangkaian==
 
Di bawah ini adalah lambang untuk fotoresistor yang dipergunakan pada skema rangkaian.
 
[[Berkas:15580.gif]]
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== Lihat pula ==
*[[Optoelektronika]]
*[[Sensor cahaya]]
*[[Fotodioda]]
 
{{teknologi-stub}}
 
[[Kategori:Komponen resistif]]
[[Kategori:Perangkat optis]]
[[Kategori:Sensor]]
 
== Lihat pula ==
*[[Optoelektronik]]
*[[Dioda foto]] bereaksi lebih cerat terhadap perubahan cahaya, cocok untuk penerimaan data.
==Pranala luar==
*(en) [http://www.sccs.swarthmore.edu/users/06/adem/engin/e72/lab7/ Menggunakan resistor foto untuk mengikuti cahaya]
*(en) [http://www.acroname.com/howto/photoresistor/photoresistor.html Menghubungkan resistor foto ke sirkuit]
[[Category:Elektronika]]
[[Category:Transduser]]
[[KategoriCategory:Sensor]]
[[ar:مقاومة ضوئية]]
[[ca:LDR]]
[[da:LDR-modstand]]
[[de:Fotowiderstand]]
[[en:Photoresistor]]
[[es:Fotorresistencia]]
[[fi:LDR-valovastus]]
[[fr:Photorésistance]]
[[gl:LDR]]
[[it:Fotoresistenza]]
[[he:תא פוטואלקטרי]]
[[hu:Fotocella]]
[[it:Fotoresistenza]]
[[ja:フォトレジスタ]]
[[ms:Perintang peka cahaya]]
[[nl:Lichtgevoelige weerstand]]
[[ja:フォトレジスタ]]
[[pl:Fotorezystor]]
[[pt:LDR]]
[[sk:Fotorezistor]]
[[sr:Фото-отпорник]]
[[fi:LDR-valovastus]]
[[sv:Fotomotstånd]]
[[uk:Фоторезистор]]