Q1: What is a vibration meter?
A1: Vibration meter is used to directly indicate the peak, peak-to-peak, mean value or root mean square value of vibration quantity such as displacement, velocity, acceleration and derivative of acceleration. The main parts of this vibration tester are integral differential circuit, amplifier circuit, voltage detector and meter head. The integral and differential circuit is used to complete the integral and differential operation between the above vibration quantities. Generally, the integral and differential operational amplifier can be used, and the low-pass filter and high-pass filter can be used respectively to complete the integral and differential operation. However, attention should be paid to their application frequency range when using such instruments for calculation. The vibration meter allows one to obtain only the total intensity of the vibration (the vibration level) and no other information.
Q2: How does a vibration meter work?
A2: Mechanical vibration is generally measured by electrical measurement. The basic principle of vibration meter is to convert mechanical quantity into electric quantity through vibration sensor, and then measure and analyze the electric quantity, so as to obtain various parameter values of the measured mechanical vibration quantity. In the field vibration test of turbine generator set, the vibration sensor commonly used in vibration tester has three types, they are eddy current non-contact displacement sensor to measure the relative vibration of rotating shaft, inertia speed sensor and voltage acceleration sensor to measure the vibration of bearing seat and foundation, cylinder structure and so on. In addition, in order to measure the absolute vibration of a rotating shaft, a composite sensor consisting of an eddy current non-contact displacement sensor and an inertial velocity sensor is often used.
Q3: What does a vibration meter do?
A3: The vibration meter can easily measure the vibration parameters such as vibration, acceleration and velocity. The vibration tester can also be used to reliably and quantitatively evaluate the vibrations of rotating and reciprocating machines. It is widely used in mechanical design and manufacture, military, electric power, equipment management, transportation and environmental protection departments etc. The vibration meter provides these fields great convenience for on-line inspection and monitoring of machine equipment faults and aging signals, product quality control, vibration test measurement and vibration control.
Tips: What is a pen vibration meter?
Pen vibration meter is designed to utilize the piezoelectric effect of quartz crystals and artificially polarized ceramics (PZT). When a quartz crystal or an artificially polarized ceramic is subjected to mechanical stress, the surface of the charge is generated, and the resulting charge density is strictly linear to the magnitude of the applied mechanical stress. At the same time, the mechanical stress is proportional to the acceleration value when the sensitive mass is given. Under certain conditions, the charge generated by the piezoelectric crystal is proportional to the perceived acceleration value.
