b 6 inderaja termal
TRANSCRIPT
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INDERAJA SISTEM INDERAJA SISTEM TERMALTERMAL
Kuliah Penginderaan JauhKuliah Penginderaan Jauh
Program Studi Teknik GeologiProgram Studi Teknik GeologiFTKE USAKTIFTKE USAKTI
20082008
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INDERAJA SISTEM INDERAJA SISTEM TERMALTERMAL
a). a). Baru dikembangkan sekitar 4 Baru dikembangkan sekitar 4 darsa warsadarsa warsa
b). b). Sistem Inderaja yang relatif baruSistem Inderaja yang relatif baru
c). Potensial dapat penginderaan c). Potensial dapat penginderaan Siang dan MalamSiang dan Malam
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Inderaja Pasif(Optis - Infra merah reflektif)
Inderaja Termal (Infra merah)
Inderaja Aktif(Gelombang Mikro)
0.5 m 3 m 10 m
Sinar matahari Radiasi obyek termal(suhu, emisivitas)
Radiation obyek gel.mikro
Radar
Cahaya terpantulCahaya terpancar
Panjang Gelombang
Ultra -violet
Optis IM Reflektif IM Termal Gelombang Mikro
Sumber Radiasi
Cahaya spektral
Spektrum Elektro- magnetik
SistemSistem Inderaja Inderaja
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SSpepekktrum trum EElectromagnetilectromagnetik k (SEM)(SEM)
opticalimagery thermal
imagery
radar imagery
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AZAS INDERAJA SISTEM TERMALAZAS INDERAJA SISTEM TERMAL
1. 1. Pancaran tenaga termalPancaran tenaga termala. a. Azas pancaranAzas pancaranb. b. Permindahan panasPermindahan panas
2. 2. Variasi pancaran tenaga termal, di pengaruhi :Variasi pancaran tenaga termal, di pengaruhi :a. a. Panjang gelombangPanjang gelombangb. b. Suhu permukaan bendaSuhu permukaan benda : : - Konduktifitas - Konduktifitas termaltermal
- - Kapasitas termalKapasitas termal - - Kebauran termalKebauran termal - Ketahanan - Ketahanan termaltermalc. c. Nilai pancaranNilai pancaran
3. 3. Inderaja dengan tenaga termalInderaja dengan tenaga termal
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Azas PancaranAzas Pancaran Semua benda memancarkan panas karena gerak aSemua benda memancarkan panas karena gerak accaakk
partikelnya gerak menyebabkan geseran partikel partikelnya gerak menyebabkan geseran partikel suhu > suhu >
Panas didalam benda = tenaga kinetik (T kin) Panas didalam benda = tenaga kinetik (T kin) CC Panas yang dipancarkan = tenaga radiasi (T raPanas yang dipancarkan = tenaga radiasi (T radd) )
Watt/cmWatt/cm
TT rad < T kinrad < T kin (Curran, 1975)(Curran, 1975) (Lillesand (Lillesand && Kiefer, 74) Kiefer, 74) (Sabin Jr, 1970)(Sabin Jr, 1970)
Pada OPada OK (-213K (-213C), semua partikel benda diaC), semua partikel benda diam.m. KKarena suhu permukaan bumi 27arena suhu permukaan bumi 27C, maka terjadi gerak C, maka terjadi gerak
arah partikel arah partikel semua benda memancarkan panas semua benda memancarkan panas
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Gelombang elektromagnetik pada spektrum IR termalGelombang elektromagnetik pada spektrum IR termal::- Saluran IR sedang : 1,3 - Saluran IR sedang : 1,3 m - 5,5 m - 5,5 m m Sensor Sensor 3,5 3,5 -- 5,5 5,5 m m- Saluran IR jauh : 5,5 - Saluran IR jauh : 5,5 m – 400 m – 400 m m Sensor Sensor 88 - - 14 14 m m
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PerpindaPerpindahhan panasan panas
Ada 3 cara panas berpindah yaitu :Ada 3 cara panas berpindah yaitu : Konduksi = Interaksi antar molekulKonduksi = Interaksi antar molekul
mis ; memis ; merrebus makananebus makanan KonKonveveksi = terbawa oleh benda panas ksi = terbawa oleh benda panas
yang berpindahyang berpindah
mis ; air dimis ; air dirrembus / udara panasembus / udara panas RadiasiRadiasi = dalam bentuk gelombang = dalam bentuk gelombang
elektromagnetelektromagnet
mis ; panas matahari dapat di ruang mis ; panas matahari dapat di ruang hampahampa
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Paket juga dapat berupa teknologi penginderaan jauh untuk konservasi sumberdaya alam, misalnya untuk pencegahan bahaya kebakaran hutan (1), bahaya kekeringan (2), dan evaluasi daerah bekas kebakaran (3), sebagai akibat perubahan iklim global misalnya perisiwa El Niño (4).
(1) (2)
(3)
Inderaja untuk Kekeringan dan Kebakaran LahanInderaja untuk Kekeringan dan Kebakaran Lahan
(4)
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