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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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 distances...
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Related Experiment Video

Updated: Jun 27, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

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Published on: May 1, 2018

Dual-Signal Direct Time-of-Flight Method for Long-Range Groundwater Level Monitoring in Observation Wells.

Abror Shavkatovich Buriboev1, Farkhat Rajabov2, Jamoljon Djumanov2

  • 1Department of Artificial Intelligence, Gachon University, Seongnam 13120, Republic of Korea.

Sensors (Basel, Switzerland)
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new dual-signal direct time-of-flight (ToF) method for accurate groundwater-level monitoring in deep wells. The radiofrequency-synchronized ultrasonic system overcomes limitations of conventional methods, achieving high reliability and precision.

Keywords:
433 MHz ISMLoRa synchronizationdirect acoustic propagationfloating receivergroundwater monitoringmedian filteringobservation wellspower gatingultrasonic time-of-flight

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Area of Science:

  • * Environmental monitoring
  • * Geophysics
  • * Sensor technology

Background:

  • * Conventional ultrasonic systems struggle with deep observation wells due to multipath reflections and signal attenuation.
  • * Accurate groundwater-level monitoring is crucial for water resource management and environmental studies.
  • * Existing methods face challenges in narrow, deep well geometries.

Purpose of the Study:

  • * To develop and validate a novel dual-signal direct time-of-flight (ToF) method for reliable groundwater-level monitoring.
  • * To overcome the limitations of conventional non-contact ultrasonic systems in deep observation wells.
  • * To enable low-power, long-term deployment compatible with IoT systems.

Main Methods:

  • * Implemented a dual-signal direct time-of-flight (ToF) approach combining radiofrequency (RF) synchronization with one-way airborne ultrasonic propagation.
  • * Utilized a floating receiver positioned at the groundwater surface for direct ToF acquisition.
  • * Incorporated a duty-cycled power architecture and a multi-shot acquisition strategy for robustness and low power consumption.

Main Results:

  • * Achieved a mean absolute error of 0.048 m and a maximum absolute error of 0.050 m over a 12-month field validation.
  • * Demonstrated a high valid detection rate of 99.4% in actual groundwater-monitoring conditions.
  • * Confirmed stable acoustic-link ToF detection up to 300 m in a confined pipeline test, indicating extended range capability.

Conclusions:

  • * The proposed RF-synchronized one-way ultrasonic ToF method offers a robust and accurate solution for groundwater-level monitoring in deep wells.
  • * The system's compatibility with low-power and IoT-based monitoring enhances its applicability for long-term environmental studies.
  • * This direct ToF approach effectively mitigates issues associated with echo-based ranging in challenging well environments.