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Steel MakingManganeseManganese adds considerably to the tensile strength of steel,... Refining The Grain This is remedied by reheating the piece to a temperature slig... Instructions For Working High-speed Steel Owing to the wide variations in the composition of high-speed... Carbon Steels For Different Tools All users of tool steels should carefully study the different... Placing The Thermo-couples The following illustrations from the Taylor Instrument Compan... The Pyrometer And Its Use In the heat treatment of steel, it has become absolutely nece... High-carbon Machinery Steel The carbon content of this steel is above 30 points and is ha... Quenching Tool Steel To secure proper hardness, the cooling of quenching of steel ... Take Time For Hardening Uneven heating and poor quenching has caused loss of many ve... Sulphur Sulphur is another impurity and high sulphur is even a greate... S A E Heat Treatments The Society of Automotive Engineers have adopted certain heat... Impact Tests Impact tests are of considerable importance as an indication ... Correction For Cold-junction Errors The voltage generated by a thermo-couple of an electric pyrom... Machineability Reheating for machine ability was done at 100 deg. less than ... Tensile Properties Strength of a metal is usually expressed in the number of pou... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Silicon SILICON is a very widespread element (symbol Si), being an es... Fatigue Tests It has been known for fifty years that a beam or rod would fa... Gas Consumption For Carburizing Although the advantages offered by the gas-fired furnace for ... |
Optical System And Electrical Circuit Of The Leeds & Northrup Optical PyrometerCategory: PYROMETRY AND PYROMETERS For extremely high temperature, the optical pyrometer is largely used. This is a comparative method. By means of the rheostat the current through the lamp is adjusted until the brightness of the filament is just equal to the brightness of the image produced by the lens L, Fig. 123, whereupon the filament blends with or becomes indistinguishable in the background formed by the image of the hot object. This adjustment can be made with great accuracy and certainty, as the effect of radiation upon the eye varies some twenty times faster than does the temperature at 1,600 deg.F., and some fourteen times faster at 3,400 deg.F. When a balance has been obtained, the observer notes the reading of the milliammeter. The temperature corresponding to the current is then read from a calibration curve supplied with the instrument. As the intensity of the light emitted at the higher temperatures becomes dazzling, it is found desirable to introduce a piece of red glass in the eye piece at R. This also eliminates any question of matching colors, or of the observer's ability to distinguish colors. It is further of value in dealing with bodies which do not radiate light of the same composition as that emitted by a black body, since nevertheless the intensity of radiation of any one color from such bodies increases progressively in a definite manner as the temperature rises. The intensity of this one color can therefore be used as a measure of temperature for the body in question. Figures 124 to 126 show the way it is read. Next: Correction For Cold-junction Errors Previous: Leeds And Northrup Optical Pyrometer
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