Pyrometry recording

Figure 3.16. Time-resolved shock luminosity record from one of the channels in a shock pyrometry experiment (Lyzenga and Ahrens, 1979).

Figure 4.25. Experimental configuration for optical pyrometry of shock temperatures induced in transparent minerals. Upon impact of projectile with driver plate, a shock wave is driven into the driver plate and then into the sample. Optical radiation from the sample is detected via six lens/interference filter channels and an array of six photodiodes. Signals from photodiode circuits are recorded on oscilloscopes operating in single sweep model. (After Ahrens et al. (1982).)...

The true temperature of a sample heated using a filament pyrolyzer can be quite different from the above profile temperature, significantly lower temperatures being recorded inside the samples [4]. In order to obtain a correct Teq, modern equipment uses a feedback controlled temperature system (see e g. [5] for a more detailed description of this type of pyrolyzer). Several other procedures for a precise temperature control of the filament are available, such as the use of optical pyrometry or thermocouples [6, 7], Special pyrolysis systems that allow programmed heated rates at different time intervals also are available [8]. 

Recording Pyrometry.—The pyrometers which can be made to record automatically fall under the following classifications (1) Gas, saturated vapor, and liquid thermometers (2) resistance thermometers (3) thermoelectric pyrometers (4) radiation pyrometers. 

An important probe of carbon surface functionality is mass spectrometry, in monitoring the nature of the gaseous phase produced from heated carbon fibers by temperature-programmed desorption (TPD). In the author s group TPD has been applied by heating the Fibers electrically while monitoring the temperature by optical pyrometry and the gaseous phase by mass spectrometry XPS data were recorded at the same time [8],... 

The most eomplete polymerization observed in thiek samples was attributed to a thermal effeet, die rise in temperature caused by the exothermic polymerization being more pronoimced in thick samples than in thin films," as shown by the temperature profiles recorded by pyrometry (Fig. 7.6). This temperature rise will prevent the premature ending of the polymerization due to vitrification which is observed in diin films. For the latter, a more eomplete polymerization ean still be aehieved by rising the sample temperature up to 80°C, either before or after the UV exposure, as shown in Fig. 7.7. This leads to a further hardening of the nanocomposite polymers, the Persoz pendulum hardness rising to 350 s on a scale which extends from 0 to 400 s for mineral glass. 

Temperature profiles recorded by pyrometry upon UV-curing of 25/im and 1 mm thick polyurethane-acrylate nanocomposite samples. Light intensity 50 mWcm-2 32... 

The accurate measurement of sample temperature during heating by a microwave field is seen as one of the major problems to be overcome for the successful exploitation of microwave ceramic processing. Infra-red pyrometry has been used extensively to date, particularly when a single mode applicator forms the basis of the sintering system. However, this technique suffers from the disadvantage that only the surface temperature of the samples is recorded. 

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