Infrared radiation generator

As a result of analysis of heat-generating devices, the infrared radiation generator was selected as a supplementary source of thermal energy (Figure 2.85). This device produces directional heating of the surface and has a high coefficient of efficiency of 65%. 

Imaginative applications of polymers to fenestration can also be used for flat-plate collectors. A transparent, coated polymeric glazing which transmits the solar spectrijm but returns the Infrared radiation effectively Increases the Insulation provided by the glazing, because the Infrared radiation generated Inside the structure Is retained. A polymeric film which changes from transparent to opaque when heated above a transition temperature acts as an automatic window shade which could help control stagnation temperatures [9]. 

Instrumental Interface. Gc/fdr instmmentation has developed around two different types of interfacing. The most common is the on-the-fly or flow cell interface in which gc effluent is dkected into a gold-coated cell or light pipe where the sample is subjected to infrared radiation (see Infrared and raman spectroscopy). Infrared transparent windows, usually made of potassium bromide, are fastened to the ends of the flow cell and the radiation is then dkected to a detector having a very fast response-time. In this light pipe type of interface, infrared spectra are generated by ratioing reference scans obtained when only carrier gas is in the cell to sample scans when a gc peak appears. 

A thermopile sensor generates an output voltage that depends on the temperature difference between its hot and cold contacts. For infrared temperature measurement, the hot contacts are normally thermally insulated and placed on a thin membrane, whereas the cold contacts are thermally connected to the metal housing. Infrared radiation, which is absorbed by the hot contacts of the thermopile, causes a temperature difference between hot and cold contacts. The resulting output voltage is a measure for the temperature difference between radiation source and cold contacts of the thermopile sensor. It is therefore necessary to measure also the temperature of the cold contacts by an additional ambient temperature sensor in order to determine the temperature of the radiation source. 

Infrared Radiance is the amount of infrared energy primarily emitted by the quartz envelope of the UV source. This energy is collected and focused, with the UV energy on the surface of the substrate to the extent depending on the IR reflectivity and efficiency of the reflector. Infrared radiation can be expressed in energy or irradiance units but, most commonly, the surface temperature it generates is of primary interest. The heat it produces may be a benefit or a nuisance.2... 

In 1.0 s, a desk lamp rated at 100 W (or 100 J-s ) emits 25 J of its energy in the form of yellow light of wavelength 580 nm. The rest of its energy is emitted as light of different colors and as infrared radiation. How many photons of yellow light does the lamp generate in 1.0 s ... 

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