TETSP-2 system composition and characteristics.
CUILU Detection TETSP-2 tunnel seismic advanced prediction system is mainly composed of TETSP-2 host machine, data acquisition terminal, yellow mud coupling geophone. According to user needs can also choose to configure roller direct coupling probe, electromagnetic impact source, wireless trigger device, WIFI positioning system and other functional enhancement equipment.
The characteristics and advantages:
①Sensor: bandwidth 1 Hz-5 kHz. Sensitivity 2.5 V/g
②Source: electromagnetic impact source, explosive, hammer.
③Probe: Direct coupling probe, fast installation, good signal quality, no consumables
④Trigger: Wireless trigger device
⑤Provides the initial model interface for transient electromagnetic inversion
⑥Sampling: sampling interval 5.2μs, dynamic range 126 dB
⑦Collection: High-power WIFI, away from explosives, safer construction
⑧Software: Process operation, intelligent interpretation
⑨The forecast distance is 100-200 m, with few accessories, light weight, safety and high efficiency

Basic configuration of TETSP-2 tunnel earthquake advance prediction system

TETSP-2 host and data collection system

TETSP-2 tunnel advanced prediction system
TETSP-2 host system and data acquisition terminal adopt separation mode, and adopt high-power WIFI to realize wireless data transmission connection. Operators can stay away from the equipment to realize data acquisition and control, and stay away from explosives to ensure personnel safety. The data acquisition terminal adopts MIL-810G standard of US army, which has high reliability. Endurance of 8 hours, waterproof, dustproof grade reaches IP65 standard, anti-vibration, anti-impact.

Coupling probe

It adopts wide-band and ultra-high sensitivity three-component acceleration sensor: bandwidth 1 Hz-5 kHz, ultra-high sensitivity 2.5V /g (sensor sensitivity of American and domestic counterparts is 1V/g);
Compared with velocity geophone, acceleration geophone has wider spectrum and higher imaging resolution. The initial arrival of accelerometer waveform is clean, the initial arrival position is easy to identify, and the initial arrival pickup is more accurate. Accelerometer adopts chip integration, three component data consistency is good, can clearly identify acoustic wave field.

Bandwidth: left is TETSP-2 acceleration type, right is velocity type.

Under the condition that the offset is 20m and the amount of explosive is 100g, the acceleration and velocity sensors collect signals. The red spectrum is acceleration, and the blue spectrum is velocity. The acceleration spectrum is obviously wider than the velocity type, and the detection resolution is higher.

TETSP-2 acceleration geophone 
The TETSP sensor is more sensitive and the initial acoustic wave is more pronounced.

velocity sensor data
The consistency of the speed sensor is not good, the spectrum of the Y component is lower than that of other components, and the consistency of the TETSP-2 data is very good. The dominant frequency of the velocity sensor is less than 1.5 kHz, while the TETSP reaches 3.8 kHz.

Roller direct coupling probe (optional)

Roller direct coupling probe
Roller direct coupling probe is independently developed by our company, with independent intellectual property rights, the use of hard roller spring, in the drilling hole to achieve the sensor and tunnel wall direct coupling, do not use coupling agent, the maximum degree to ensure the fidelity of the signal, quick and convenient installation, save construction time, improve work efficiency.

There are three coupling modes at home and abroad: 
· Butter coupling of common coupling (home) : shear wave attenuation and high frequency data; 
· Steel sleeve coupling coupling mode (a Swiss product) : the sleeve and the sensor contact not firm, energy attenuation;
· Quick-drying cement paste sensor coupling way (the United States a product) : is inevitable sound wave, surface wave interference, etc.

TETSP seismic advanced prediction software system

TETSP seismic advance prediction software system adopts our company's latest independently developed intelligent software TETSP5.0 system. The software system adopts the process operation mode, with intelligent interpretation and other related functions.

Project management: unified project path management, open directly in the project bar, do not have to go to the specified directory;
Display interface: the display occupies a large screen, the waveform display is clear, the offset image resolution is high;
Intelligent process: independent modular, according to the specified process processing;
Three-dimensional display: visually display the three-dimensional spatial characteristics of the abnormal interface;
Comprehensive prediction: migration profile and petrophysical property profile are analyzed at the same time;
Stable results: after summarizing the parameters for many years, the results of different personnel processing are unique, without multiple solutions;
Operation tracking: easy to check and repeatedly test parameters.

TETSP The system has the ability to combine multiple detection methods and expand

Provides initial model output interface for joint inversion of transient electromagnetic equipment.

· Number of channels：12 channels;
· A/D Number of Bits: 24 bit;
· Dynamic range: 126 dB;
· Mininum sampling interval: 5.2μs;
· Sampling point: 2048、4096、8192;
· Sensor sensitivity: 2.5 V/g
· Sensor bandwidth: 1Hz-5kHz
· Work temperature: -30~60℃, humidity: 40°C, relative humidity: 90-95%
· Communication mode of the main control system: WIFI transmission
· Amplitude consistency: superior to ±2％
· Phase equalization: superior to ±0.01ms
· Frequency response: 0.1Hz – 5 kHz
· Noises：full frequency ＜1µV
· Forecast distance: tunnel face 100~200 m
· Gain: 1 times, 10 times, 100 times
· Trigger mode: rapid trigger line, loop line triggered, no delay error, no special requirements for detonator; (zero delay loop trigger)
· Source type: electromagnetic impact source, explosive, hammer.
· Host built-in lithium battery: work time is more than 8 hours, not to accept the external power supply
· Acquisition system: automatic separation and main control system, data communication. Uses wireless WIFI transmission; 
· Data gathering: when display double window display, at the same time show the current signals and profile, conducive to real-time check signal quality. 
· Sampling: 192kHz(Sampling interval: 5.2μs)、96kHz(Sampling interval: 10.4 μs)、48 kHz(Sampling interval: 20.8μs)、24 kHz(Sampling interval:41.6μs)、12 kHz(Sampling interval: 83.2μs)、6 kHz(Sampling interval: 166.4μs)、3 kHz(Sampling interval: 333.8μs) et al.
· Master control system: military hardware, solid-state drives, operating system Windows 10, 8 hours of battery life, rugged touch screen, high brightness, satisfy the requirement of tunnel work under the bad environment and field under the strong light visible operation requirements. 
· Processing software: have the wave field separation, velocity analysis, instantaneous amplitude, migration imaging, abnormal extract interface, rock physical property analysis processing module, output migration profile, rock physical property and results section