NDT is the abbreviation of Non-destructive Testing.NDT refers to a test method that does not damage or affect the future performance or use of materials or workpieces.By using NDT, defects in the interior and surface of materials or workpieces can be found, geometric characteristics and dimensions o

Touch screen (also known as "touch screen", "touch panel") is an inductive liquid crystal display device that can receive input signals such as contacts. When a graphic button on the screen is touched, the The haptic feedback system can drive various connected devices according to a pre-programmed p

Abstract: Summarize the defects and possible non-destructive testing methods used in the manufacture and use of automobiles and railway tankers, including radiation, ultrasound, magnetic particles, penetration, magnetic leakage, acoustic emission, and magnetic memory testing, etc., and introduce eac

Acoustic emission signals are propagating in the solid media contain characteristic information of acoustic emission sources. To use this information to reflect material characteristics or the development of defects, it is necessary to receive such acoustic emission signals on solid surfaces. Acoust

Four. Classification of piezoelectric materials1. The first type of piezoelectric material piezoelectric single crystal .This is a naturally occurring or artificial single crystal ferroelectric material with anisotropy. Its piezoelectric effect is based on the composition of the crystal structure Ca

Parameters of piezoelectric materials and piezoelectric equations (3)(11)Mechanical quality factor QmWhen the PZT material piezo ceramic is used for resonance vibration, it is necessary to overcome the internal mechanical friction loss (internal consumption), and when there is a load, it is necessar

Second, the piezoelectric parameters3. There is a complicated relationship between the piezoelectric parameters of piezoelectric materials, such as e = dE and E = -he as described above. Comparing them seems to give d = -1 / h, but it is not true in practice. Because the former is given under the co

PZT can not only be used to make various piezoelectric products, but in recent years PZT is gradually applied to structural damage detection. According to the positive and inverse piezoelectric effects of piezoelectric materials, PZT piezoelectric ceramics can be used as both driving and sensing ele

The development history and characteristics of ultrasoundAcoustics, as a branch of physics,it is a science that studies the occurrence, propagation, reception, and effects of sound waves. Before 1940, there were only single-crystal piezoelectric materials, which made ultrasonic wave not widely used.

Comparison of density, dielectric constant and piezoelectric coefficient of PZN-PZ-PT ceramic film obtained by casting method and dry pressing method:

Piezoelectric ceramic micro-actuators are new type solid-state actuators made using the inverse piezoelectric effect. They are widely used in high tech fields such as precision optics, micromechanics, microelectronics, and computer applications. These applications require piezoelectric ceramic devic

The transducer array are the key components in the sonar system. It is a device that realizes the mutual conversion of electro-acoustic energy. The performance of the transducer and the transducer array mainly depends on the performance, structure and manufacturing process of the transducing materia

The design of this cylindrical transducer is to realize the electro-acoustic conversion by using the thickness vibration of the 1-3-2 composite material element to obtain the uniform directivity in the horizontal direction. The design frequency of the transducer is 74kHz. In order to analyze and pre

This design uses a single-chip microcomputer as the control and parameter calculation circuit. The signal generator outputs a continuous analog excitation frequency sweep signal, which is applied to the piezoelectric ceramics ,which detects the voltage and current amplitude of the analog signal, con