SEISMIC EQUIPMENT

Seismometers, geophones and dataloggers

Innovative molecular-electronic sensors of linear and angular motion and measuring systems

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Autonomous wireless data logger module NDAS-8224.

Autonomous wireless data logger NDAS-8226.

The renewed CME-6211 low noise broadband seismometer.

 

 



TECHNOLOGY NEWS

 

 

August 2017: An article by our colleagues. 

The Journal of Atmospheric and Oceanic Technology of the AMERICAN METEOROLOGICAL SOCIETY has published an article "Low-frequency seismic node based on molecular-electronic transfer sensors for marine and transition zone exploration."

This paper reports on a field-testing of the self-contained seismic station NDAS-8224, which has a modular structure allowing for operations under different environmental conditions, like onshore, offshore to 500 meters depth and at transition zones. The station operation frequency band is 300 Hz, which is wider than that of the majority of seismic stations based on standard (10 Hz) geophones.

 

  August, 2017: Presenting NDAS data loggers.

The data loggers' product line has been enriched by the products of the NordLab LLC -
an R-sensors and MIPT joint enterprise. The new data loggers are named NDAS. They exploit the latest ARM architecture Texas Instruments' controller and a multichannel ADC from Analog devices. Low power consumption and wireless Wi-Fi interface for setup and signal quality control are but two distinctive features of NDAS. A GPS/GloNass combined receiver provides coordinates and clock synchronization.

The current product line is constituted by 4 channel low power autonomous data logger NDAS-8224 and 6 channel multi-purpose data logger NDAS-8226. The 12 and 48 channel versions are under development. The data loggers can be equipped by accelerometer and magnetic compass which make possible the determination of azimuthal orientation and tilt with respect to vertical direction, as well as by temperature, pressure and humidity sensors for checking the working conditions and impermeability in case of a submerged deployment. All auxiliary information from sensors is available in telemetric transfer from the logger, as well as it is stored along with the registered signal.

The full compatibility with the R-sensors' seismic sensors was of most importance during the development of the loggers. Now a joint project of R-sensors and NordLab for the design of seismographs - a seismic sensors with integrated data logger is undergo.

 

 

February 2017: An article by our colleagues. 

The journal "IEEE Sensors Journal" published an article "Design and Self-Noise of MET Closed-Loop Seismic Accelerometers".

This paper reports on the development of the feedback system for an MET seismic accelerometer, a feedback stability analysis, and an optimization of the signal conditioning feedback electronics to get the highest dynamic range. The article is focused on the principles of operation of the MTSS-1033A seismic accelerometer and contains the latest comprehensive analysis of the noise generation mechanisms which occur in molecular-electronic transducers.

 

 

October 2016: Two articles published. 

The journal "Sensors — Open Access Journal" published an article "Molecular Electronic Angular Motion Transducer Broad Band Self-Noise". And the journal IEEE SENSORS JOURNAL published an article "Experimental Studies of Temperature Dependence of Transfer Function of Molecular Electronic Transducers at High Frequencies".

Both articles were written by our colleagues and are presenting the latest results of the MET sensors' studies obtained in MIPT laboratories in 2015 - 2016.

The first article can be downloaded from our site:

    Molecular Electronic Angular Motion Transducer Broad Band Self-Noise    (.PDF)

 

  July, 2016: The strong motion modification of METR-01.

The modification of the one-component rotational sensor METR-01 was designed and successfully tested.

The modified sensor has a 1 rad/sec input signal range. To comply with the output voltage range, the sensitivity was reduced ten times down to 5 V/rad/sec. In order to do this, an additional thin ceramic paper was placed inside the sensing channel. Follow the link for a METR-01LS sensor tests' presentation.

 

  March, 2016: The renewal of Baykal-CME seismic station.

The components of seismic station Baykal-CME were renewed.

The new DSP of Baykal-8  (BY-8) seismic station allowed for recording the same signal at different sample rates simultaneously. The recording of signal with reduced sampling permits a quick amplitude analysis to be performed on a long-term recording, which is highly demanded by seismologists. Apart from this, the output for applying periodical test signals to sensors was introduced.

The modification of seismic sensor CME-6211 allowed for wide power supply options to be offered, namely from +5 to +36V DC, which were earlier available only for CME-6111 seismic sensor. Besides, the self calibration circuits were modified so the response curves for all three channels can be obtained. The circuits were optimized for interaction with Baykal-8   seismic recorder.

 

 

March, 2016: A book has been published. 

Springer Publishing House published a second edition of the book Instrumentation in Earthquake Seismology. The chapter "Some New Trends in Seismic Sensors" contains a description of modern electrochemical transducers of linear and angular motion. The CME-6211 - a top model among the seismometers produced by R-sensors is listed in the summary table "Overview of some active sensors available on the market".

The Preliminary version of the first edition, June 2002, is available at the link.

 

December, 2015: An article by our colleagues. 

A paper "Low-noise Linear and Angular Motion Sensors for Vibration Monitoring" was presented in the Third International Conference on Advances in Civil, Structural and Construction Engineering - CSCE 2015 held by The Institute of Research Engineers and Doctors in Rome, Italy. This article reviews on the development of a new category motion sensors for vibration monitoring including linear and angular accelerometers based on molecular electronic transducer (MET) technology.

 

 

 

November, 2015: A book has been published. 

Encyclopedia of Earthquake Engineering has been published and is available on SpringerLink with an article by our colleagues Electrochemical Seismometers of Linear and Angular Motion . This article is a complete description of the state-of the art in the electrochemical motion sensors. It covers all related aspects - electrochemical basics, mechanical features of different types of sensors, signal amplification and introducing a force-feedback into the system. The work also includes an overview and comparison tables of modern commercial seismometers, compact seismic sensors - both accelerometers and geophones along with a unique family of rotational electrochemical sensors.

 

  August, 2015: The production of OEM sensing modules.

R-sensors have launched the production of sensing modules for third party seismic systems. The three component sensing modules designed for installation into an external protective case can be based on a broadband seismometer CME-4211 or on a high-sensitive geophone MTSS-2003. These modules provide a cost-effective solution for customized digital seismic stations and can be used with most analog-to-digital converters. The circuitry enables self-calibration by means of an external DAC for MTSS-2003 or self-testing for CME-4211. The parameters of the modules are similar to those of conventional sensors. The sensing modules based on a seismic accelerometer MTSS-1043A are also available.

 

December, 2014: An article by our colleagues.

The "Sensors — Open Access Journal" published on the 26th of December, 2014 an article

A Low-Noise DC Seismic Accelerometer Based on a Combination of MET/MEMS Sensors . The article explores a possible approach to the construction of a hybrid seismic accelerometer combining the superb performance of a MET sensor in the middle and high frequency range with a conventional on chip MEMS accelerometer covering the lower frequencies and gravity. Apart from R-sensors, our colleagues from CME and NordLab LLC contributed to this article. The described principles give the basis for a construction of a new commercial DC seismic accelerometer.

The local copy of the article is available on our site:

      A Low-Noise DC Seismic Accelerometer Based on a Combination of MET/MEMS Sensors   (.PDF)

 

April, 2014: A new СМЕ-6111 seismometer.

The newly designed version of СМЕ-6111 force feedback seismometer has been introduced.

Among the advantages to say but two are wide input voltage range ( 9-36 V DC, isolated) as well as the operability from low voltage power source (single +5 V DC or dual ± 5 V DC non-isolated).

 

February, 2014  Redesigned compact size sensing element.

Testing of a renewed compact size sensing element for MTSS-1033A accelerometer has been finished.

The newly designed sensing element has smaller size, higher frequency cut-off and wider dynamic range. The redesigned MTSS-1033A accelerometer has also been successfully tested and is currently ready for production.

 

October, 2013: Low power version of СМЕ-6011.

A low power version for the СМЕ-6011 has been designed. The typical current consumption for the sensor is 10 mA.

 

June, 2014: Renovation of the СМЕ/Baykal seismic station.

The test on a redesigned CME/Baykal seismic station consisting of a seismometer CME-4311/CME-6011 and a seismic recorder Baykal-8 has been successfully finished.

 

April, 2013: An article by our colleagues. 

A "Sensors — Open Access Journal" has published on 8 April 2013 a comprehensive review on modern state of Molecular Electric Transducers as Motion Sensors . This article contains theoretical part of transducing motion to a current flow, overview of up-to-date sensors techniques as well as perspectives of rotational sensors application. The article contributed by our colleague Dr. Vadim Agafonov. The local copy of the article is available on our site:

       Molecular Electric Transducers as Motion Sensors: A Review   (.PDF)

 

February, 2013: The renovation of the 4011/4111 sensor family. 

The CME-4011 & CME-4111 models, known as the first sensors based on MET-technology, have been produced by our company since it's establishing. From this time on, the construction has been optimised and revised for several times. By now we have acquired a considerable experience of using these models especially under severe field conditions. The newly designed devices named CME-4211 and CME-4311 are thoroughly re-designed versions of CME-4011 & CME-4111 respectively. During 2012, both families were produced at the same time, and from 2013 the new models will replace the old ones entirely. Along with improving durability, changes were made in vertical channel and output filters. The new CME-4211 and CME-4311 families feature drastically more stable newly designed vertical transducer with force feedback. Output filters have 2nd order low-frequency slope lowering the DC drift and shortening settling time after power on. Besides, the input power supply range has been extended to 10.5 - 30 VDC. The case design and output connectors remain as in previous models. The renewed low-power versions are also available.

 

July, 2012:  A new СМЕ-6011 seismometer.

The engineering department of our company has developed a new broadband seismometer СМЕ-6011 . The instrument has passed comprehensive testing studies and soon will be ready for serial production.

The seismometer extends the family of high sensitive broadband force feedback seismometers started by CME-6211, having but lighter weight and being more adapted for field conditions. The amplification stages anf supply curcuitry have been significanly modified, which resulted in improving overall characteristics of the sensor.

 

May, 2011: Tests of the MTSS-1033A accelerometer.

The seismic accelerometer MTSS-1033A has been tested at the Institute of Geosphere Dynamics of Russian Academy of Sciences (IDG RAS) and at the National Metrological Institute of Russia (VNIIFTRI). The characteristics of the accelerometer have been confirmed on the certified shake table.

 

January, 2011: A newly designed shake table has been set in operation.

A new wide dynamic range shake table has been set in operation at R-sensors facility. The newly designed shake table is intended for high precision seismic sensors calibration within 0.001 to 300Hz frequency range. The instrument has enriched the calibration means which are in use by R-sensors for tests and adjustment of linear and rotational seismic sensors.

 

2010: The Baykal seismic station.

A new portable autonomous seismic station CME/Baykal based on broadband molecular-electronic seismometers CME-4111/CME-6211 and self-contained high-resolution digital recorders Baykal-7HR/Baykal-ACN have been tested and now ready for sale.

The CME/Baykal seismic stations are currently in use by oil exploration companies and geophysical research institutes in severe field conditions in Siberia and in the Arctic regions.

 

November, 2009: A new combined gyro sensor.

A low-noise subminiature angular rate sensor MTRS-614A has been developed on the base of the molecular-electroniс rotational microsensor.

The latest development of molecular-electronic technologies gave rise to the ultra small and lightweight yaw rate sensor, comparable with the microelectromechanical gyros in size, weight and power consumption. Unlike the MEMS gyros, the new MET sensor is characterized by a significantly higher sensitivity and very low intrinsic noise level. However, the bandwidth of this sensor is limited in low frequencies by a value of ~0.02 Hz due to the physical operating principles. In MTRS-614A, the signal from the MET sensor is complemented by the low-frequency component of the ADXRS614 (Analog Devices MEMS gyro) signal.

This solution allows to extend the range of application to zero frequency maintaining extremely low noise of molecular electronic sensors.

More info... (.PDF)

 

September, 2009: High rise building vibrations studies.

Studies of the seismic vibrations of a 44-storeyed building using the commercially available angular velocity sensors METR-03 have been carried out. The presence of a rotational vibration mode, that prevoiusly was beyond registration by means of linear sensors - the rotational vibration at 0.7Hz around the vertical axis in particular, has been established.

 

 

September, 2009: Limbs motion parameters sensors.

A prototype of the device for measuring the motion parameters of a moving man's body and his lower extremities has been developed and successfully tested. The development is made on the base of the very compact molecular-electronic sensors of the linear and rotational motion. The application fields of the development are: sports medicine, orthopedics. The patent for the development is obtained.

The development is made under supporting of The Russian Federal Agency for Science and Innovations (www.fasi.gov.ru ).

 

May, 2009: A prototype of the Nord seeking devivce.

A prototype of the North seeking device, a geographic north direction seeker, based on the rotational molecular-electronic sensors has been developed and tested in cooperation with The Center for Molecular Electronics (MIPT, Moscow, Russia). The precision of the azimuth detection for the newly developed device is better than 0.1°·sec(φ).

The device is insensitive to magnetic fields, has very compact size, low consumption and cost. It can be used in high-precision autonomous portable navigation systems. This development may have a significant potential as an advantageous alternative to the gyro-compass systems.

 

2009: An updated case design for CME-4111/4011 seismometers.

An improved external case for the compact broadband seismometers CME-4111/4011 has been developed. The case is equipped with adjusted legs, a bubble level for precise leveling, a handle for carrying and a bayonet connector for faster cable connection.

The seismometers CME-4111, 4011, 3111, 3011 can now be supplied with this optional external case instead of a standard simplified case.

 

2008: A unique six components sensor.

A high-performance 6-component velocimeter has been developed. The device has 3 linear and 3 rotational sensitivity axes. The possible applications of the sensor are in engineering geophysics, exploration seismology, industrial vibration monitoring, seismic monitoring of the high-rise buildings and various constructions.

The standard pass band of the device is 0.5-100 Hz. The device can supplied with a digital recorder with off-line and GPS options.

 

2007: A new area protection system.

The prototype of an intrusion protection system which is based on compact-size molecular-electronic seismic sensors and is able to detect steps of a walking man has been developed. The system successfully passed the field tests.

The prototype allows to detect a moving man from a 50-100 meters distance (depending on the type of the soil), as well as to locate the direction towards the moving person with the highest accuracy using only a single 3-component seismic sensor installed in the center of a secured area (instead of a set of sensors arranged along the perimeter of the area).

The development offers a low-cost and effective solution for the area security applications.



November 5-9, 2017

  
R-sensors took part in the
9th Congress of the Balkan Geophysical Society in Antalya, Turkey.


August, 2017

The "Journal of Atmospheric and Oceanic Technology" published an article by our colleagues "Low-frequency seismic node based on molecular-electronic transfer sensors for marine and transition zone exploration".


August, 2017

Presenting brand-new wireless data loggers NDAS from
R-sensors Group.


June 29, 2017

The R-sensors' project for developing broadband seismic and acoustic sensors for marine seismic exploration was approved and financed by the Fund for assistance of small industrial enterprises (FASIE).


February 28, 2017

R-sensors gets approval for the prospective project of developing of hydrophones and combined sensors for marine seismic exploration.


February, 2017

The "IEEE Sensors Journal" published an article by our colleagues "Design and Self-Noise of MET Closed-Loop Seismic Accelerometers".


December, 2016

The Journal of sensors published an article on applications of accelerometers in passive seismic. Molecular-electronic sensors are listed in comparison table.


October, 2016

Presenting two articles by our colleagues dedicated to the further MET sensors studies.


August, 2016

Tests of the wireless seismic station for land-sea transition zones were held in cooperation with IPE RAS at Azov Sea (South Russia).


July, 2016

Successful tests of the one-component strong motion rotational sensor METR-01LS were held.




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