difference beam的意思|示意

Difference beam (also known as beam-deflection technique or extensometer) is a type of measuring device that is widely used for measuring the displacement and strain of objects in various fields. It is mainly composed of a source of light, a beam splitter, a pair of balanced photoelectric receivers, and a sensitive amplifier.

When using difference beam, the light is emitted from the source of light and separated by the beam splitter into two identical beams. These beams then pass through an object and reflect off the surface back onto two pairs of balanced photoelectric receivers. The receivers convert the reflected light into corresponding electrical signals. After this, the amplifier amplifies and compares the signals. Any displacement of the object will cause a difference in the two signals. The magnitude of this difference is proportional to the displacement and strain of the object, thus providing an accurate measurement of the object’s strain and displacement.

Difference beam is widely used in testing engineering materials and components, such as aircraft engines and structures, as well as in monitoring the performance of civil engineering structures. It is also used in industrial production, such as measuring the displacement and strain of a machine tool or measuring the displacement of a grinding wheel for precision machining. In addition, it is also used for measuring the physical properties of materials, such as their coefficient of thermal expansion and viscoelastic damping.

Overall, the difference beam is a versatile and reliable measuring device that provides accurate measurements of displacement and strain. Its ability to accurately measure the displacement, strain, and other physical properties of objects makes it an invaluable tool for many modern applications.