Tungsten-halogen

Lamp types (a) incandescent and tungsten-halogen lamp shapes (b) fluorescent and compact fluorescent lamp shapes (c) typical high-pressure sodium lamp (d) typical metal halide lamp. 

Deposition by rapid thermal heating with tungsten halogen lamp banks at 600-900°C.[ ][ l... 

Hot- and cold-mirror CVD coatings are used in projectors to maintain the film gate at low temperature and avoid damaging the film. They are also used increasingly in tungsten-halogen lamps. 

DIBF has the absorbance spectrum shown in Figure 4. Coating mixtures containing this photoinitiator can be cured with an intense tungsten halogen lamp, such as a projector bulb. When DIBF is irradiated it forms an excited state which has a very low absorbance, i.e., it photobleaches (1). This allows light to penetrate deeply into the coating. 

The first commercial unit was produced by Dickey-John. It contained a tungsten-halogen lamp, six interference filters, and uncooled lead sulfide (PbS) detectors, using a 0 45° geometry. That is, the light struck the sample straight on and the fight was collected at 45° to the normal. 

Instead of glowbars, as used in MIR, tungsten halogen lamps are the sources of light. The detectors are solid-state semiconductors such as lead sulfide (PbS) or indium gallium arsenide (InGaAs). These are orders of magnitude quieter than typical MIR detectors and often more sensitive. 

The tungsten-halogen lamp operates in a very specific mode, dependent on the detailed chemistry of the atmosphere within the lamp enclosure. The lamp envelope is normally a thin quartz bulb, filled with an inert... 

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