The transmission and reflection spectra of arrays of heterogeneous nanowires made of Ni/Co, FeNi/Co, and Ni/Fe, formed in track polymer membranes by the galvanic method, have been studied in the frequency range from 16 to 250 THz. Many peaks in the 16-20 THz range were found in the transmission spectra, while they are not observed in the spectrum of a track membrane without nanowires. The absorption spectra of an array of nanowires in a track membrane and a membrane without wires are calculated from the obtained spectra. It was found that the fraction of the THz radiation power absorbed by nanowires and its spectrum depend on the materials of the nanowires. The features of the observed spectra can be explained by two mechanisms. The first is the inverse laser effect in magnetic nanocontacts. And the second is the change in electrical resistance due to spin-flip transitions between the spin subbands in the case of a non-coplanar distribution of the magnetization of the magnetic layers. This class of quasi-one-dimensional structures looks promising for creating THz radiation detectors in a wide spectral range and at room temperature.
The electromigration influence on main characteristics of planar electrochemical systems with difference parameters was studied. The transporting processes are simulated, current-voltage characteristic, transfer function and THD were calculated, and quantitative estimates of the magnitude of the asymmetric electromigration flow and its effect on the nonlinearity coefficient of the system are obtained.
In this paper we demonstrate a new prototype of a high-precision ultra-low-frequency hydrophone on the basis of a planar type electrochemical transducer (ECT). We have developed a new planar electrochemical microchip and have invented a mechanical system that allows detecting the alternating pressure at low frequencies up to 0.01 Hz. We have obtained the transfer characteristics of our device to convert pressure variation into an electrical signal, and they are very promising. The main advantage of the electrochemical hydrophone is high sensitivity in the infrasound range. The developed sensitive element can become the basis for a new generation of acoustic pressure receivers, vector acoustic receivers, sound pressure gradient loggers.
We have developed the new technology for production of sensitive modules for electrochemical sensors of pressure and acceleration. The technology is applicable for mass production and scalable for high-volume production. In this work we demonstrate the new sensing module for electrochemical motion sensors, and its possibility of applying in geophones. We fabricated prototypes of electrochemical planar transducer chips, produced a laboratory prototype of a geophone based on our planar transducer chip, and tested them. This paper presents the preliminary results of the tests.
In this paper we investigate the possibility of applying a planar electrochemical trancducer (ECT) as a sensing element for a precision seismometer with a high inertial mass. The precision seismometer based on simplest planar ECT was manufactured and tested. We investigated the amplitude-frequency and volt-ampere characteristics, self-noise level and the transducer’s impedance frequency dependence. One of the key characteristics for the seismometer is the intrinsic noise level, this work focuses on the self-noise level.
Planar electrochemical systems are very perspective to build modern motion and pressure sensors. Planar microelectronic technology is successfully used for electrochemical transducer of motion parameters. These systems are characterized by an exceptionally high sensitivity towards mechanic exposure due to high rate of conversion of the mechanic signal to electric current. In this work, we have developed a mathematical model of this planar electrochemical system, which detects the mechanical signals. We simulate the processes of mass and charge transfer in planar electrochemical transducer and calculated its transfer function with different geometrical parameters of the system.
This paper describes using a MET-based low-noise angular motion sensor to precisely determine azimuth direction in a dynamic-scheme method of measuring Earth’s rotation velocity vector. The scheme includes installing a sensor on a rotating platform so that it could scan a space and seek for the position of highest Earth’s rotation vector projection on its axis. This method is very efficient provided a low-noise sensor is used. We take a low-cost angular sensor based on MET (molecular electronic transduction) technology. Sensors of this kind were originally developed for the seismic activity monitoring and are well-known for very good noise performance and high sensitivity. This approach, combined with use of special signal processing algorithms, allowed for reaching the accuracy of 0.07° for a measurement time of 200 seconds.
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