ZD18 Comprehensive Wave Speed Tester

Product description :

     ZD18 Comprehensive Wave Speed Tester is a set of four-channel high-resolution, digital wave speed tester. It has functions such as time-sampling, superposition, filtering, signal enhancement, noise suppression, real-time calculation on site, display of measured waveform and test results.

     ZD18 Comprehensive Wave Speed Tester is mainly composed of wave speed tester, wave speed detector (abbreviation: probe), three-component detector,

 trigger detector, ground pulsation sensor and special cable, etc .; the wave speed detector is mainly sealed by a cylindrical metal waterproof It 

consists of electromagnetic excitation source, two independent fully sealed detectors, damping and high-strength soft rubber tube.

Application:

u Field investigation shear wave velocity test

u Field investigation micro-tremor excellence cycle test

u Shear wave and compression wave test for engineering survey;

Applicable standards

Code for Seismic Design of Buildings  GB 50011-2010

Code for Investigation of Geotechnical Engineering  GB 50021-2001

Code for Testing of Dynamic Characteristics of Foundation GB/T 50269-2015

Features 1:

u 10.4-inch high-definition and high-brightness color touch screen, with special touch pen;

u The acquisition operating system is WinCE 6.0, and the analysis software supports winXP, win7, and win10 systems.

u Data and graphics are saved in * .bmp, * .Excel, * .word formats, and word report formats can be issued;

u Convenient operation, stable performance, industrial-grade motherboard, high signal-to-noise ratio, strong anti-interference ability, adapt to harsh environment；

u Imported chassis, the whole machine is sealed, beautiful and firm, the structure is reasonable, and it has good anti-vibration, moisture-proof, waterproof, dust-proof performance;

u The instrument uses a built-in rechargeable lithium battery, which can continuously complete work for no less than 16 hours, and is equipped with a dedicated charger；

Features2:

u It is suitable for the excitation method in the hole, that is, the excitation in the hole and the reception in the hole, without the need to hit the vibration source on the ground to achieve the accuracy of the wave velocity test in the hole

u It is suitable for the method of gusseting, that is, hitting the ground vibration plate with a heavy hammer, so that the vibration wave propagates down the ground and realizes the wave speed test;

Working principle:

A method for determining the wave velocity of the formation where the borehole is located by using the arrival time of the S-wave signal from the source received by the geophone placed in the borehole.

In the borehole, the well fluid is used as a coupling agent, and an instantaneous impact force is applied perpendicular to the borehole wall with an electromagnetic shock source. Two types of particle vibration are generated in the borehole formation. One is that the particle vibration direction is perpendicular to the borehole wall , Which propagates along the direction of the borehole, is called S wave (shear wave, shear wave); the other is that the particle vibration direction is the same as the propagation direction and is called P wave (compression wave, longitudinal wave).

The detector receives the S-wave vibration signal and converts it into an electrical signal, and then transmits it to the computer. After the computer processes the signal, the computer 

uses two cross-correlation analysis methods to automatically calculate the time difference between the S-wave propagation between the two detectors. Find out the S-wave propagation speed between the two channels.

When the shock plate is struck on the ground and an impact force is applied to the ground, P waves and S waves propagate downward along the borehole formation. 

When the P waves and S waves propagate to the position of the detector, the detector can convert the P wave and The S-wave first arrival time and vibration waveform

 are converted into electrical signals and recorded by the instrument. The wave velocity value of the stratum between the two points can be calculated from the first

 arrival time difference of the adjacent P · S waves.

Technical Parameters:

Wave speed test method:

Acquisition interface:

Analysis interface

Standard configuration:

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