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WZG-24C
GOLD
Product Description
WZG Series Engineering Seismograph is developed as a 24bit instrument under Chinese/English version WINDOWS operating system. With years of designing and manufacture experiences, and accepting latest electronic technologies and design ideas, WZG series seismograph is multi-function, high accuracy, high speed, reliable data and good expandability.
Seismic source may be hammer, electric spark or explosion. It is extremely suitable for wave velocity testing (sheared wave), surface wave detecting, pier foundation inspection, ground micro-tremor survey, seismic imaging, shake measurement, and reflection and refraction survey.
Once confirmed which detection method, we will provide standard geophones.
Channel number: 12/24/48
Sample stations: 1024, 2048, 4096, 8192, 16384
Sample frequency:10μs, 25μs, 50μs, 100μs, 200μs, 500μs, 1ms, 2ms, 5ms, 10ms, 20ms
For micro-tremor survey, 1ms ~ 200ms selectable
A/D converter: 24bit
Signal stack and amplification: 32 bit
Dynamic range: 140dB
Frequency bandwidth: 0.1Hz ~ 4000Hz
Noises: 1μV(full-frequency state)
Amplitude consistency: ±0.2%
Phase consistency: ±0.01ms
Time lapse: 0 ~ 9999ms
Data format: SEG-2
Working temperature: 0℃~ 50℃, 90%RH
Storage temperature: -20℃ ~ +60℃
The working theory of engineering seismographs is mainly based on the principle of inertia, the principle of elastic mechanics, the principle of electromagnetic induction, the principle of piezoelectric effect and the theory of data processing and analysis. The following is a detailed introduction:
Inertia principle
When an earthquake occurs, the ground will vibrate, and the vibration pickup in the engineering seismograph senses this vibration through the inertial mass block. When the instrument vibrates with the ground, the mass block will remain relatively still due to inertia, thereby generating relative motion with the frame of the instrument. This relative motion reflects the vibration of the ground.
Elastic mechanics principle
The spring or other elastic element in the vibration pickup will produce elastic deformation when the mass block and the frame move relative to each other. According to the principle of elastic mechanics, the elastic force is proportional to the deformation. By measuring the deformation of the elastic element, the relative motion between the mass block and the frame can be obtained, and then the information of ground vibration can be obtained.
Electromagnetic induction principle
Some engineering seismographs use electromagnetic induction to convert the mechanical motion of the mass block into an electrical signal. When the mass block moves relative to the magnetic field, an induced electromotive force will be generated in the closed coil, and this induced electromotive force is proportional to the movement speed of the mass block. According to the law of electromagnetic induction, the magnitude and direction of the induced electromotive force are related to the rate of change of the magnetic flux. By measuring the induced electromotive force, the speed information of the ground vibration can be obtained.
Principle of piezoelectric effect
Some piezoelectric materials will generate electric charge when subjected to mechanical stress. This phenomenon is called piezoelectric effect. In engineering seismographs, this characteristic of piezoelectric materials is used to convert the mechanical stress caused by ground vibration into electrical signals. When the vibration pickup senses ground vibration, it will cause stress changes in the piezoelectric material, thereby generating electric charge on its surface. By measuring the size and change of the charge, relevant information about ground vibration can be obtained.
Data processing and analysis theory
The collected seismic signals usually contain various noises and interferences, and digital signal processing technology needs to be used to filter, denoise, amplify, etc. to improve the quality of the signal. Then, according to the relevant theories and methods of seismology, the processed signals are analyzed, such as calculating the propagation speed, frequency, amplitude and other parameters of the seismic wave, so as to infer the source location, magnitude and other information of the earthquake.
