Ultrasonic amplitude measuring instrument is a kind of equipment specially used for ultrasonic amplitude measurement. It is used to measure the output amplitude of ultrasonic plastic welding, spot welding, cutting, sonochemical, cell crushing and other equipment. It can also measure the output amplitude of ultrasonic transducer, ultrasonic horn and tool head separately.
Ultrasonic longitudinal vibration is a telescopic reciprocating motion, so the starting position of any particle is the midpoint of the reciprocating motion of the vibration. When the ultrasonic wave is not vibrating, the detection head of the sensor first contacts the detected point, and the indicated position at this time is the midpoint of the ultrasonic vibration. After the ultrasonic wave is activated, the detected point pushes the detection head of the sensor to move forward (that is, the positive direction), and then moves back (negative direction) when it reaches the farthest point, while the detection head remains basically stationary here. What the sensor indicates is the maximum value Ap of the unilateral amplitude of ultrasonic longitudinal reciprocating vibration. The peak-to-peak value of the amplitude, Ap-p = 2Ap, which is twice the amplitude of Ap, is the ultrasonic amplitude that we most often say. Aa = 0.707Ap-p RMS amplitude, used when doing ultrasound studies.
technical core
For any ultrasonic welding, whether it is ultrasonic plastic welding or ultrasonic metal welding, four parameters can be used to describe it. In other words, the effect of ultrasonic welding depends only on four parameters, namely frequency, time, pressure, and amplitude. Among them, the first three parameters are very convenient to control, adjust and display. Both the equipment manufacturer and the equipment user are well aware of and pay enough attention to. They are also the adjustment parameters in the daily operation of the equipment. The amplitude (displacement) of ultrasonic vibration is a key indicator of ultrasonic equipment, and it is also one of the most difficult to measure and understand physical quantities. In addition to experts and scholars, not to mention equipment users, even most equipment manufacturers do not care much about it. We have counted most of the instruction manuals of ultrasonic random equipment, but there are few instructions about ultrasonic amplitude, including the physical meaning of amplitude, the control and adjustment of amplitude, and the relationship between amplitude and welding quality.
The amplitude of ultrasonic vibration directly represents the magnitude of ultrasonic output energy, and is also related to the strength of related materials and the service life of the whole machine. Whether it is for manufacturers of ultrasonic equipment or users of ultrasonic equipment, it cannot be overemphasized how important it is.
For the ultrasonic vibration system, from the perspective of transmitting energy, the main indicator is called the sound intensity I of the ultrasonic wave. It refers to the energy transmitted per square centimeter per second in the direction of propagation perpendicular to the traveling wave, i.e. I=1/2ρcω2ξ2 where: ρ is the density of the material C is the speed of ultrasonic propagation in the material ω is the angular frequency ξ is the ultrasonic wave Obviously, as the ultrasonic amplitude increases, the ultrasonic energy increases exponentially in a squared relationship.
In the ultrasonic welding process, if the amplitude is too small and the welding energy is not enough, the welding place will not be welded firmly. Even increasing the pressure or prolonging the welding time did not have a good effect. If the amplitude is too large, it will cause over-soldering, glue flow or welding through. Likewise, reducing the pressure or shortening the time has little effect. If the mold design is unreasonable and the amplitude distribution is uneven, the welding will be uneven and the quality will be greatly reduced.
In the design and production process of ultrasonic equipment, if the amplitude design of the vibration system is too large, the internal stress of the material is correspondingly too large, which exceeds the tensile strength and fatigue strength of the material itself. The result is the material of the mold, horn or transducer. cracked. Generally speaking, we recommend that customers control the amplitude parameters of the corresponding components within a reasonable range when designing the ultrasonic system to ensure the safe and reliable operation of the ultrasonic system.
Functions and Features：
1. Digital display.
2. Absolute and relative measurements.
3. The large display screen can be rotated 360°.
4. Any position can be cleared.
5. Metric and imperial conversion can be performed at any position.
6. The analog pointer can display the changing trend.
7. Automatic shutdown and manual shutdown.