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Related Concept Videos

Distance Measurements by Taping01:18

Distance Measurements by Taping

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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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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...
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Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Special considerations while measuring pulse01:13

Special considerations while measuring pulse

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Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:
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Distance Problem01:29

Distance Problem

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When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
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Distance Corrections01:15

Distance Corrections

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Distance and Velocity Measurement of Coherent Lidar Based on Chirp Pulse Compression.

Jing Yang1,2, Bin Zhao3, Bo Liu4

  • 1University of Chinese Academy of Sciences, Beijing 100049, China. yang.cute@foxmail.com.

Sensors (Basel, Switzerland)
|May 30, 2019
PubMed
Summary

This study presents a new coherent lidar system using an electro-optic modulator (EOM) for high-resolution distance and velocity measurements. The system achieved accurate range (±22 cm) and radial velocity (±1.066 cm/s) measurements.

Keywords:
coherentdistancelidarpulse compressionvelocity

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Area of Science:

  • Optics and Photonics
  • Remote Sensing Technology
  • Laser Systems Engineering

Background:

  • Coherent lidar systems enable simultaneous measurement of target distance and velocity.
  • Traditional systems often employ acousto-optic modulators (AOMs), which can limit resolution and system complexity.
  • Advancements are needed for higher precision and simpler lidar designs for long-distance target monitoring.

Purpose of the Study:

  • To investigate a novel coherent lidar system employing chirp pulse compression.
  • To evaluate the performance of an electro-optic modulator (EOM) as an alternative to AOMs in lidar systems.
  • To demonstrate high-resolution range and velocity measurements of distant targets.

Main Methods:

  • A continuous 1550 nm laser was modulated using an electro-optic modulator (EOM).
  • A chirp pulse waveform with a 98 MHz bandwidth and 10 µs duration was utilized.
  • The system operated at a pulse repetition rate of 20 kHz, with 100 measurements recorded.

Main Results:

  • The EOM-based lidar system demonstrated enhanced resolution compared to conventional AOM systems.
  • The system achieved precise range measurements with an accuracy of ±22 cm.
  • Accurate radial velocity measurements were obtained with an accuracy of ±1.066 cm/s.

Conclusions:

  • The developed coherent lidar system using EOM and chirp pulse compression offers a simpler and higher-resolution alternative.
  • The system provides accurate and reliable data for both range and radial velocity of targets.
  • This technology holds potential for advanced remote sensing and target tracking applications.