A unit of measurement is a definite magnitude of a physical quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same physical quantity. Any other value of the physical quantity can be expressed as a simple multiple of the unit of measurement. For example, length…
Asked as: Explain the line standards and end standards with examples. Line Standards In the line standards the unit of length is defined as the distance between the centres of engraved lines as in a steel rule. The International prototype metre and the imperial standard yard are line standards, since the measure of length is…
Asked as: Write an informative note on length standards. All measurements of length are fundamentally comparison with a standard length. Man has recognized the need for the length standards even as far back as 3000 BC. Two commonly used length standards now-a-days are discussed below- (1) International standard metre (2) Imperial standard yard. See Also:…
Standards of Measurement and Its types of standards of measurements Asked as: Define the standard of measurement. Discuss the different types of standard of measurement. In engineering, measurement is required at all stages of manufacture. The basic purpose of measurement is to determine whether a component has been manufactured to the requirements of a specification,…
A pyrheliometer is an instrument for measurement of direct beam solar irradiance. Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. The signal voltage is converted via a formula to measure watts per square metre. It is used with a…
Thermopile Thermopiles detect the temperature of an object by absorbing the infrared (IR) radiation that emits from the object’s surface. Thermopiles are often used as part of infrared thermometers. They are most often used by medical professionals in measuring body temperature. A thermopile is a thermoelectric device that consists of an array of thermocouples connected…
An actinometer is a device that is used to measure the intensity of solar radiation. It is a chemical system that determines the number of photons by measuring the rate of change of photo-induced responses in a chemical system. The actinometer was first invented by John Herschel in 1825. It works based on the principle…
Measuring Instruments for Solar Power Systems or Sunshine Recorder or Solar Radiation Measuring instruments. While performing on numerous types of solar power systems, it’s extremely necessary to grasp the reading, regarding the radiation emitted from the sun, by its measuring devices and recording devices. The radiation of sun to the earth’s surface consists of 2…
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