Principles and methods of temperature measurement pdf

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principles and methods of temperature measurement pdf

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Temperature measurement

A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction. A thermocouple produces a temperature-dependent voltage as a result of Seebeck effect , and this voltage can be interpreted to measure temperature. Thermocouples are a widely used type of temperature sensor. Commercial thermocouples are inexpensive, [2] interchangeable, are supplied with standard connectors , and can measure a wide range of temperatures. In contrast to most other methods of temperature measurement, thermocouples are self powered and require no external form of excitation. Thermocouples are widely used in science and industry.

Please choose your language:. While passing a beam of sunlight through a prism, he observed how the light separated into a band of colours, called a spectrum. In Sir William Herschel detected the relative energy of each colour He also discovered that energy existed beyond the red visible end of the spectrum. Around , scientists Planck, Stefan, Boltzmann, Wien und Kirchhoff defined various aspects of the electromagnetic spectrum and formulated equations to describe infrared energy. In the simplest configuration, a lens will focus the infrared radiation onto a detector which in turn will convert this energy into an electronic signal. After compensating for the ambient temperature this signal will be displayed as a temperature reading. This setup enables temperature measurement from a certain distance without requiring contact to the object.

Rob D Young is a professional content writer. Personal site rdywriting. All projects must have been in the design or construction phase over the last 18 months. Industrial Top Projects. Temperature is defined as the energy level of matter which can be evidenced by some change in that matter. Temperature measuring sensors come in a wide variety and have one thing in common: they all measure temperature by sensing some change in a physical characteristic.

Thermocouple

Temperature measurement also known as thermometry describes the process of measuring a current local temperature for immediate or later evaluation. Datasets consisting of repeated standardized measurements can be used to assess temperature trends. Some of the principles of thermometry were known to Greek philosophers of two thousand years ago. As Henry Carrington Bolton noted, the thermometer 's "development from a crude toy to an instrument of precision occupied more than a century, and its early history is encumbered with erroneous statements that have been reiterated with such dogmatism that they have received the false stamp of authority. He invented the mercury-in-glass thermometer first widely used, accurate, practical thermometer [1] and Fahrenheit scale first standardized temperature scale to be widely used. Attempts at standardized temperature measurement prior to the 17th century were crude at best. For instance in AD, physician Claudius Galenus [3] mixed equal portions of ice and boiling water to create a "neutral" temperature standard.

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Principles and Methods of Temperature Measurement

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Principles and Methods of Temperature Measurement

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Temperature measurement is a vital part of most industrial operations and is typically accomplished by a temperature sensor--a thermocouple or a resistance​.


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