Study of Transfer Characteristics of a Molecular Electronic Sensor for Borehole Surveys at High Temperatures and Pressures

Evseev, Iliya A.; Zaitsev, Dmitry; Agafonov, Vadim M.

doi:10.3390/s19112545

Cited by 14 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The condition |αd| 1 is considered to be valid. The graph presented in Figure 11 shows that the frequency dependence has a character of ∼ 1 f 1.4 , which practically coincides with the dependence of ∼ 1 f 1.5 , as was found experimentally in a number of works [32][33][34][35].…”

Section: Signal Current Dependence On the Geometrical Characteristicssupporting

confidence: 83%

See 1 more Smart Citation

Modeling of the Electrochemical Motion Sensor Conversion Factor at High Frequencies

et al. 2022

Self Cite

View full text Add to dashboard Cite

The conversion factor of the electrochemical motion sensors at low frequencies is usually quite high. At the same time, it decreases significantly with the increase in frequency. Thus, increasing the conversion factor for high frequencies is essential for practical use. In this work, the theoretical model that allows establishing the basic laws governing the conversion of high-frequency signals in an electrochemical cell has been suggested. The approach was based on the fact that in the case of high frequencies, the diffusion length is less than the distance between the electrodes and the thickness of the channel and it is enough to consider the transformation of the fluid motion into electrical current only near the cathodes. It was found that the signal output current can be represented as the sum of the term which is proportional to the steady-state concentration gradient along the surface on which the cathode is located, and the term proportional to the concentration gradient normal to the surface. Both first and second terms and the total signal current have been calculated for a particular case of a four-electrode planar system. The practical conclusion is that the high frequency conversion factor increases with the interelectrode distance and the channel width decreases compared to the cathode dimension.

show abstract

Section: Signal Current Dependence On the Geometrical Characteristicssupporting

confidence: 83%

“…, which practically coincides with the dependence of ~1 𝑓 . , as was found experimentally in a number of works [32][33][34][35]. The obtained results show that the stationary and signal currents depend on the geometry of the electrochemical cell in different ways.…”

Section: Signal Current Dependence On the Geometrical Characteristicssupporting

confidence: 75%

Modeling of the Electrochemical Motion Sensor Conversion Factor at High Frequencies

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The formation of high geotemperature in tunnels is mainly determined by heat source and heat conduction channel. Primarily, heat sources can be divided into four categories [16][17][18]: (1) Hot spots are formed in the upper dome of mantle asthenosphere, i.e., deep crustal thermal anomaly; (2) Heat dissipation during cooling of underground magma chambers or high-temperature intrusions in the crust or surface ejecta, i.e., waste heat of magmatic rock;…”

Section: Development Characteristics Of High Geotemperature In Tunnelsmentioning

confidence: 99%

Review of Research Progresses and Application of Geothermal Disaster Prevention on Large-Buried Tunnels

2022

View full text Add to dashboard Cite

Geothermal disaster caused by high geotemperature is a commonly encountered geological problem in tunnel engineering, especially in large-buried tunnels, which is directly related to the safety, technology, and economy of tunnel construction. It seriously affects the personnel security and the performances of construction equipment and building materials, greatly increasing the construction difficulty, and extending the total construction period, which has become a major issue to be urgently solved in the tunnel construction. This paper first briefly introduces the formation mechanism of the high-geotemperature environment of a large-buried tunnel and analyzes the significant influences of high-temperature on personnel, equipment, and materials in the construction process of tunnel engineering. Then, the worldwide research progress of rock mechanics in high-temperature large-buried tunnels is systematically described, including the thermo-mechanical properties of rock mass, the thermo-mechanical properties of shotcrete, and the rheological mechanism and control technology of surrounding rock. Subsequently, the previous geothermal disaster classification of large-buried tunnels is summarized and evaluated. Finally, the research findings of the key technologies of geothermal disaster prevention and control are presented in detail from three aspects of temperature reduction, thermal insulation, and personal protection, which are of great theoretical and practical significance for ensuring the safety design and construction of tunnels in similar geological environment.

show abstract

“…Inertial motion sensors are the main elements of all mineral exploration systems. Currently, in addition to widely used electromechanical geophones, electrochemical geophones [1,2] operated on the principles of molecular-electronic transfer (MET) [3,4], have begun to be used in such land systems [5,6].…”

Section: Introductionmentioning

confidence: 99%

Frequency Response Stabilization and Comparative Studies of MET Hydrophone at Marine Seismic Exploration Systems

Egorov

Shabalina

Zaitsev

et al. 2020

Sensors

Self Cite

View full text Add to dashboard Cite

Low frequency hydrophone with a frequency range of 1−300 Hz for marine seismic exploration systems has been developed. The operation principle of the hydrophone bases on the molecular electronic transfer that allows high sensitivity and low level self-noise at low frequencies (<10 Hz) to be achieved. The paper presents a stabilization method of the frequency response within the frequency range at a depth up to 30 m. Laboratory and marine tests confirmed the stated characteristics as well as the possibility of using this sensor in bottom marine seismic systems. An experimental sample of the hydrophone successfully passed a comparative marine test at Gelendzhik Bay (Black Sea) with the technical support of Joint-Stock Company (JSC) “Yuzhmorgeologiya”. One of the main results is the possibility of obtaining high-quality information in the field of low frequencies, which was demonstrated in the course of field tests.

show abstract

Study of Transfer Characteristics of a Molecular Electronic Sensor for Borehole Surveys at High Temperatures and Pressures

Cited by 14 publications

References 21 publications

Modeling of the Electrochemical Motion Sensor Conversion Factor at High Frequencies

Modeling of the Electrochemical Motion Sensor Conversion Factor at High Frequencies

Review of Research Progresses and Application of Geothermal Disaster Prevention on Large-Buried Tunnels

Frequency Response Stabilization and Comparative Studies of MET Hydrophone at Marine Seismic Exploration Systems

Contact Info

Product

Resources

About