Source-Sensor

Mabbit, Allen, and Andrew Parker. Methane, and Carbon Dioxide Detection Using LED Sources. Sensor Rev. 16 (1996), pp. 38-41. 

Consequently, mirror optics are more common, in particular in the mid-IR. The mirrors used are usually aluminium- or gold-coated flat or curved substrates. While near-IR mirrors are usually protected by thin SiO-layers, in the mid-IR unprotected mirrors have to be used. Disadvantages of mirror optics are the elevated space consumption and the higher prices in comparison to refractive optics, especially comparing non-standard mirrors against non-standard lens. In total, mirror optics are so preferable to fibres and refractive optics, at least in the mid-IR, that in some technical applications they are used to replace waveguides to transport IR radiation between source, sensor head and spectrometer. 

APPLICATION CHALLENGES POWER SOURCES, SENSORS, AND ACTUATORS... 

Similar technology is also being used in induction hotplates and radiant heating elements and in the silicon nitride hotplates currently under development and which are characterized by an excellent heat transfer between heat source, sensor and saucepan. Gas hotplates could also be provided with the latest in domestic temperature sensing technology by fitting them with electric temperature control circuitry. 

This chapter reviews energy sources, sensors or detectors, and techniques for improved detection, while Chapter 11 combines these into practical instruments. Some sources are discussed here because they are fun to talk about and not because they are useful. 

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