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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

520
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
520
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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Twenty-Meter Laser Strainmeter "Popova Isl."

Mikhail Bolsunovskii1,2, Grigory Dolgikh2, Stanislav Dolgikh2

  • 1Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia.

Sensors (Basel, Switzerland)
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A novel 20-meter laser strainmeter utilizes a Michelson interferometer and a stabilized laser to measure Earth

Keywords:
Michelson interferometerlaser strainmeter

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Area of Science:

  • Geophysics and seismology
  • Optical instrumentation
  • Laser interferometry

Background:

  • Earth's crustal movements are critical to understand seismic activity.
  • High-precision measurement tools are needed to detect subtle ground displacements.
  • Existing strainmeter technologies have limitations in sensitivity and frequency response.

Purpose of the Study:

  • To design and operate a 20-meter unequal-arm laser strainmeter.
  • To achieve high-accuracy measurements of crustal displacements.
  • To integrate the strainmeter into a wider seismoacoustic observatory network.

Main Methods:

  • Utilizing a Michelson interferometer configuration.
  • Employing a frequency-stabilized helium-neon laser source.
  • Implementing advanced interferometry techniques for displacement detection.

Main Results:

  • Achieved a measurement accuracy of 30 picometers.
  • Covered a frequency range from 0 to 1000 Hz for displacement detection.
  • Demonstrated the feasibility of a 20-meter unequal-arm design.

Conclusions:

  • The developed laser strainmeter offers unprecedented precision for geophysical monitoring.
  • The instrument is suitable for integration into a network of seismic observatories.
  • This technology advances the capability for real-time Earth dynamics study.