Optical Pyrometer Working Principle: Optical Pyrometer Working Principle – Any metallic surface when heated emits radiation of different wavelengths which are not visible at low temperature but at about 550 °C, radiations in shorter wavelength are visible to eye and from the colour approximate temperature is measured. The approximate values of temperature for colour (colour […]
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Pyrometer Working Principle: When temperature being measured is very high and physical contact with the medium to be measured is impossible or impractical, optical pyrometer based on the principle of thermal radiation are used. These Types of Pyrometer Working Principle are used under condition where corrosive vapours or liquids would destroy thermocouples, resistance thermometer and
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LM335 IC Temperature Sensor: LM335 IC Temperature Sensor – IC sensor produces a voltage or current signal that increases with increase in temperature. It eliminate the linearity errors associated with thermistor. However, being semiconductor devices, they are available in both voltage and current output configuration. Figure 13.51 shows a National semiconductor LM335 IC. It provides
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Semiconductor Temperature Sensing Diode: Semiconductor Temperature Sensing Diode is a versatile device and finds use in many applications. Two of its parameter, that is forward voltage drop (Vf) and reverse saturation current (Is) are temperature sensitive. The sensitivity of Is with temperature is non-linear, but Vf has a linear temperature coefficient over a wide temperature range. Hence, Vf can
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Thermocouple Connection: One of the most commonly used methods of measurement of moderately high temperature is the thermocouple effect. When a pair of wires made up of different metals is joined together at one end, a temperature difference between the two ends of the wire produces a voltage between the two wires of Thermocouple Connection
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Platinum Resistance Thermometer: Platinum Resistance Thermometer – The resistance of a conductor changes when its temperature is changed. This property is used for measurement of temperature. The Resistance Thermometer uses the change in electrical resistance of conductor to determine the temperature. The requirements of a conductor material to be used in these thermometers are: The
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Resistance Temperature Detector (RTD): Resistance Temperature Detector (RTD) commonly use platinum, nickel or any resistance wire whose resistance varies with temperature and which has a high intrinsic accuracy. They are available in many configuration and sizes; as shielded or open units for both immersion and surface applications. The relationship between temperature and resistance of conductors
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What is a Temperature Transducer?: Temperature Transducer is one of the most widely measured and controlled variable in industry, as a lot of products during manufacturing requires controlled temperature at various stages of processing. A wide variety of Temperature Transducer and temperature measurement systems have been developed for different applications requirements. Most of the Temperature
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What is a Photodiode?: A reverse biased Semiconductor diode passes only a very small leakage current (a fraction of 1μA in silicon diodes), if the junction is exposed to light. Under illumination, however, the current rises almost in direct proportion to the light intensity. Hence, the photodiode can be used for the same purposes as
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Photoelectric Transducer Working Principle: Photoelectric Transducer can be categorized as photo emissive, photo-conductive or photo-voltaic. In photo emissive devices, radiation falling on a cathode causes electrons to be emitted from the cathode surface. In photo conductive devices, the resistance of a material is changed when it is illuminated. Photo voltaic cells generate an output voltage
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