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d. Kekuatan Lensa<br />

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Contoh 6.14<br />

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inframerah<br />

lensa Fresnel<br />

Cahaya dan Optika<br />

Informasi<br />

untuk Anda<br />

Sebuah lensa Fresnel adalah lensa<br />

plan-konveks yang tebal dibentuk<br />

berlipat-lipat agar diperoleh lensa<br />

datar yang memiliki sifat optiknya,<br />

namun lebih tipis sehingga memiliki<br />

kehilangan penyerapan yang lebih<br />

sedikit. Lensa Fresnel biasanya tipis<br />

dan lentur, ukurannya sekitar 0,015<br />

inch (0,38 mm) dengan alur lekukan<br />

pada satu permukaan.<br />

Salah satu penerapan lensa<br />

Fresnel adalah untuk alat<br />

pemfokusan sensor inframerah.<br />

Lensa Fresnel dapat<br />

memperpanjang rentang<br />

pendeteksian mencapai 100 kaki.<br />

Information for You<br />

A Fresnel lens is a plano convex lens<br />

that has been collapsed on it self to<br />

form a flat lens that retains its optical<br />

characteristics but is much thinner<br />

and therefore has less absorption loss.<br />

A Fresnel lens is ussually thin and<br />

flexible and is about 0,015 inch (0,38<br />

mm) thick with grooves molded on<br />

one surface.<br />

One of an application of Fresnel<br />

lens is to focusing devices for<br />

infrared sensors. A Fresnel lens can<br />

extend detection range to about<br />

100 feet.<br />

Sumber: www.glolab.com<br />

129

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