INFRARED [COLLAGE] []

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====== INFRARED [COLLAGE] ======

{{documentation:electronique:infrared:irda_01.png|}}
{{documentation:electronique:infrared:ir_tfds_plan_01.gif|}}
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===== HSDL-1001 =====
  * {{ documentation:electronique:infrared:hsdl1001_datasheet.pdf |Datasheet}}
{{documentation:electronique:infrared:hsdl1001_pinout_wiring_01.gif|}}

====== FAR IR / NEAR IR ======

<blockquote>Its probably worth saying that there are two sorts of IR detector, "far IR" is used for passive heat
sensing and thermal imaging - this has a wavelength range of about 6 to 10 µm, and is not detected
at all my photodiodes or phototransistors. At these wavelengths glass absorbs, so any lenses have to
be made of exotic materials and are expensive. No source of illumination is needed, the heat of objects
is enough to radiate.

"near IR" is close to the visible range of light, say 0.7 to 1.5µm (700 to 1500nm) range, and most
photo diodes and photo transistors have peak sensitivity in this range, typically 780 or 850nm. Such
near IR behaves like light and can go through glass lenses (for instance). For seeing at night in near
IR you need a source of (near IR) illumination. Most visible light sources also put out near IR, so
a white flame will, but a blue flame probably gives out nothing in near IR, but loads and loads in
far IR.</blockquote>

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