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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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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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Glassware Calibration

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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
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The Distance Formula01:20

The Distance Formula

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In geometry, measuring the direct distance between two points on a plane is essential in various practical and theoretical applications. Whether in navigation, engineering, or computer graphics, determining the shortest path between two locations involves using the distance formula. This formula is derived from the Pythagorean Theorem, which relates the lengths of the sides of a right triangle. On a coordinate plane, the horizontal and vertical distances between two points serve as the legs of...
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Related Experiment Video

Updated: Feb 15, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Distance Calibration between Reference Plane and Screen in Direct Phase Measuring Deflectometry.

Shujun Huang1, Yue Liu2,3, Nan Gao4

  • 1School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China. hbhsj824@163.com.

Sensors (Basel, Switzerland)
|January 11, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a new distance calibration method for direct phase measuring deflectometry (DPMD) systems. The technique accurately calibrates distances, overcoming depth-of-field limitations for precise 3D shape measurement of specular objects.

Keywords:
direct phase measuring deflectometry (DPMD)distance calibrationphase measurementspecular surface measurementthree-dimensional (3D) sensing

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Area of Science:

  • Optical Metrology
  • Machine Vision
  • 3D Surface Measurement

Background:

  • Direct phase measuring deflectometry (DPMD) measures 3D shapes of specular objects.
  • DPMD requires precise calibration of distances between components.
  • Limited depth of field (DOF) hinders calibration using standard machine vision techniques.

Purpose of the Study:

  • To develop a novel distance calibration method for DPMD systems.
  • To overcome the limitations imposed by the lens's depth of field.
  • To enable accurate 3D shape measurement for objects with discontinuous surfaces.

Main Methods:

  • A new calibration method utilizing a mirror with a hollow ring matrix pattern and a mobile stage.
  • Determining the mobile stage's direction within the camera's DOF using the mirror pattern.
  • Calculating reference positions outside the DOF and calibrating screen position using scaled patterns.

Main Results:

  • Accurate distance calibration achieved within the camera coordinate system.
  • Maximum absolute error of the calibration method is less than 0.031 mm.
  • Demonstrated accuracy and practicality on artificial stepped mirrors and diamond surfaces.

Conclusions:

  • The proposed method effectively calibrates distances for DPMD systems.
  • It overcomes the depth-of-field limitations of traditional machine vision approaches.
  • The technique is accurate and practical for 3D shape measurement applications.