Pneumatic pneumatic - valve Thickness gauge show the cause of the value analysis

ultrasonic thickness meter display value is too large or too small: (reasons , laminated materials, composite materials, it is impossible to measure without coupling layer material, due to the ultrasonic cannot penetrate without coupling space, and are not uniform in the composite materials, for the protection of the equipment made by multilayer material bandage should pay special attention to when thickness, thickness gauge the values of said only contact with the probe of the layer thickness of materials; ( , choice of sound velocity error: measuring the workpiece before, according to the material types preset the speed of sound or according to the standard of the sound velocity is measured, when using a material correction instrument to measure again after another kind of material, will produce the wrong results. ( , the influence of temperature: the average velocity of solid materials decreases with the temperature, and with the test data show that hot material, every ° C increase the speed of sound down %, for high temperature equipment in service often encounter this kind of situation; ( , the influence of coupling agent, coupling agent is used to eliminate the probe and the air between the object to be tested, and the ultrasonic detection can effectively penetrate the workpiece to achieve, if choose types or improper use, will cause the error or coupling marks, you can't measure, due to the coupling agent used in practical use too much, cause probe leave artifacts, instrument in value as the coupling agent layer thickness; ( , the object to be tested with sediment, sediment and artifacts when acoustic impedance difference is not big, thickness gauge display value of wall thickness and thickness of sediment; ( Oxide or paint coating, metal surface, the influence of the density of the metal surface oxide or paint coating, though close integration with the base material, unknown interface, but the speed of sound propagation velocity in two kinds of material is different, resulting in the error, and with the cover thickness is different, the error size is also different; ( Display value, when the intrinsic defects in the material about % of nominal thickness, etc. ; ( , the influence of stress: the equipment in service, most of the pipeline stress exists, the stress condition of solid materials has certain influence to the velocity of sound, when stress direction is consistent with the direction of propagation, if stress is compressive stress, the stress increase the elasticity of artifacts, the sound velocity is accelerated, on the other hand, if stress is tensile stress, the sound velocity slows, when stress does not agree with the direction of wave propagation, the fluctuation in the process of particle vibration trajectory, the influence of the stress wave propagation direction deviation, according to data show that average stress increases, the speed of sound increases slowly;
YAZE( Pneumatic company's main products: pneumatic pneumatic valve pneumatic ball valve pneumatic butterfly valve pneumatic actuator