Mechanical

Nondestructive testing (NDT) is the examination of an object or material with technology that does not affect its future usefulness. It is an approach to testing that involves in evaluating the weld without causing physical damage. The terms Nondestructive examination (NDE), Nondestructive inspection (NDI), and Nondestructive evaluation (NDE) are also commonly used to describe this

Friction Welding (FRW) – Welding Processes used in Aeronautical Industry In this process (Welding Processes used in Aeronautical Industry), joining of the metals is achieved through mechanical deformation. Since there is no melting, defects associated with melting-solidification phenomena are not present and unions as strong as the base material can be made. This process can

Atomic Hydrogen Welding (AHW) Atomic Hydrogen Welding (AHW) is a combination of electric are and gas welding technique. It is a thermo-chemical arc welding process in which the workpieces are joined by heat obtained on passing a stream of hydrogen through an electric arc struck between two tungsten electrodes. The arc supplies the energy for

Photoelectric sensor A photoelectric sensor is a device used to detect the distance, absence, or presence of an object by using a light transmitter, often infrared or LED, and a photoelectric receiver. Photoelectric sensors respond to the presence of all types of objects, be it larger, small, transparent or opaque, shiny or dull, static or

Inductive displacement sensor      The most widely used variable-inductance displacement transducer in industry is LVDT (Linear Variable Differential Transformer).  It is a passive type sensor. It is an electro-mechanical device designed to produce an AC voltage output proportional to the relative inductive displacement sensor of the transformer and the ferromagnetic core. The physical construction of

Strain Gauge Displacement Sensor The strain gauge displacement sensor consists of a structure attached with the strain gauge that elastically deforms when subjected to a displacement. Strain gauge is attached to the object by a suitable adhesive. As the member is stressed, the resulting strain deforms the strain gauge attached with the structure. This causes

Capacitive Displacement Sensors A transducer that uses capacitance variation can be used to measure displacement. Elastic deflection of a membrane due to the applied force is detected by a capacitance variation.  A highly sensitive displacement and proximity transducers can be constructed because the Capacitive displacement sensors transducer senses very small deflections accurately.  Capacitive sensors can

Static characteristics Static characteristic of an instrument are the parameters which are more or less constant or varying very slowly with time. The following characteristics are static characteristics performance terminology. Range : Every sensor is designed to work over a specified range i.e. certain maximum and minimum values. The design ranges are usually fixed and