Guralp CMG-3T seismometer

The Güralp CMG-3T is a triaxial, broadband, weak motion instrument, suitable for surface vault, subsurface vault and post-hole installations. It covers the complete seismic spectrum with a single transfer function. It has over 140 dB dynamic range over a wide frequency band. The measuring range of the instrument is 0.0083 Hz to 50 Hz, the sensitivity is 1500 V/msˉ¹, and the power consumption is 0.75 W from a 10–36 V supply. The Güralp CMG-3T is integrated with Güralp's low-noise DM24 digitizer in a single convenient package.

Custom made seismic sensor from Warsaw University

The measurement system uses a three-axis seismometer, one for vertical and two for horizontal measurements. It is equipped with LGT-2.5 and LGT-2.5H geophones with the resonance frequency of 2.5 Hz. The three sensors are mounted in a metal housing. The sensitivity of the system at 1 Hz is ≈2×10−10𝑚𝑠−1𝐻𝑧−1/2. The analogue signal from the geophones is connected to the data acquisition system placed inside the metal housing.

Custom made infrasound monitoring system from HAS ATOMKI

The system consists of a capacitor infrasound microphone and a data acquisition system. Since the pressure resolution of the microphone is on the order of 1 mPa within the frequency range of 10 mHz–10 Hz, it is suitable to measure air pressure fluctuations in the physical environment of ground-based and underground interferometric GW detectors. The microphone's input voltage is 6-10 V, and it serves signal between 0-5 V. Its pressure measuring range is -12.5-12.5 Pa. The data acquisition system consists of a Raspberry Pi 3 Model B, equipped with the 16-bit A/D converter Adafuit ADS1115. The timing and synchronization is based on Network Time Protocol (NTP).

Lemi-120 magnetometers

Magnetic variations in the upper ULF–ELF range is detected by means of Lemi-120 extremely low noise and wide frequency dynamic range induction magnetometers. The noise characteristics of Lemi-120 induction coils are plotted in figure 10. The sensor noise remains below 0.1𝑝𝑇𝐻𝑧−1/2 in the wider focus range of 1–100 Hz. The data acquisition system consists of a Raspberry Pi based data logger, two 16 bit A/D converters, an analogue filter and two induction coils as sensors of magnetic field variation positioned perpendicularly in a horizontal plane. The timing and synchronization is based on Network Time Protocol (NTP).

A portable muon telescope (Muontomograph)

To perform muon flux measurements in full 2π, a portable tracking system, called the Muontomograph, has been developed by the Wigner Research Centre for Physics. The system, which uses close cathode chambers, is optimized for environmental applications with its weight of 15 kg, size of 37×33×27𝑐𝑚3, sensitive area of 25 cm by 25 cm, position resolution of 1.5 mm and angular resolution of 15 mrad. The Muontomograph is housed in a plexiglass box, which, besides giving mechanical support, provides environmental isolation as well. The system requires continuous 0.5−2 𝐿ℎ−1 gas flow during data taking, a standard, nonflammable mixture of Ar and CO2 in 82:18 proportion. All functionalities and supply systems, including high/low voltage, triggering and data handling (DAQ) are integrated into one unit. The measured track coordinates on the layers, along with timing and triggering informations, are recorded. The total power consumption of the complete detector system is about 6 W. With a standard, 10 L, high-pressure (pmax < 250 bar) gas bottle, the Muontomograph is capable of autonomous data taking for about a 2 months.