The thermistor is a semiconductor device that has a negative temperature coefficient of resistance. Thermistors are non-metallic resistors, that is, semiconductors of ceramic materials. Basic Principle : The basic principle...
Category - Mechanical
The most common method of temperature measurement uses the thermocouples. It is based on seeback effect. The thermocouple temperature measurement is based on creation of an electromotive force (e.m.f). Basic Principle : The basic...
The pressure thermometer temperature measurement is based on fluid expansion. Fluid expansion thermometer represent one of the most economical, versatile, and widely used devices for industrial temperature measurement...
This method refers to the identification of the temperature of a surface with the colour of the radiation emitted. The optical pyrometer compares the brightness of the image produced by the temperature source with that of a...
These pyrometers absorb only infra red pyrometer rays and measure temperature. At some high temperature, a surface starts emitting I-R rays in addition to visible light energy. These I-R rays are used with a detector and...
Thermal radiation pyrometers is electro magnetic radiation emitted by a body as a result of its temperature. Thermal radiation is in the wavelength region from about 0.1 to 100µm. The total radiation emitted by a blackbody is...
For calibration of temperature measuring devices, a constant temperature source should be provided. The temperature source should as a minimum be stable enough to provide a constant temperature. (approximately ±0.2°F) for a...
Filled systems temperature is by expansion of gases and liquids when it is heated and contraction of the same when it is cooled. Fig shows a filled systems. The pressure bulb contains thermometer fluid. This is connected to a...
Laser Doppler Anemometer enables the measurement of instantaneous velocity of a gas or a liquid flowing in a glass walled channel. It offers the non-disturbance advantages of optical methods while affording a very precise...
A float technique is a small object lighter than water and thus capable of floating on the water surface. It is usually made of wood or other suitable material. Floats are used to measure the velocity of flow of water in rivers...
