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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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Related Experiment Video

Updated: Jul 15, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Published on: May 23, 2017

A low cost 3D shape measurement method based on a strip shifting pattern.

Li Yao¹, Lizhuang Ma, Zuoyong Zheng

¹Digital Media and Data Reconstruction Lab, Shanghai Jiao Tong University, China. yaolily77@sjtu.edu.cn

ISA Transactions

|April 24, 2007

Summary

This study introduces a fast, low-cost 3D shape measurement technique using projected light patterns and a digital camera. The method accurately captures 3D coordinates, overcoming material and texture limitations for enhanced object reconstruction.

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Production of a Strain-Measuring Device with an Improved 3D Printer

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Last Updated: Jul 15, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

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Published on: May 23, 2017

Production of a Strain-Measuring Device with an Improved 3D Printer

Production of a Strain-Measuring Device with an Improved 3D Printer

Published on: January 30, 2020

Area of Science:

Computer Vision
Metrology
Optical Engineering

Background:

Accurate 3D shape measurement is crucial for various applications.
Existing methods often face limitations regarding object material, texture, or speed.
Challenges include handling inter-reflection and high-light conditions in measurements.

Purpose of the Study:

To develop a simple, low-cost, and fast 3D shape measurement method.
To overcome limitations of existing techniques related to object material and texture.
To accurately determine 3D coordinates from projected patterns.

Main Methods:

Projecting a strip shifting pattern onto the object and recording with a digital camera.
Utilizing a novel space-time edge finding method for accurate shadow edge positioning.
Employing a 3-color strip pattern for objects with black textures.
Applying a post-processing 3D filter for data refinement using geometric and viewpoint constraints.

Main Results:

The method accurately captures 3D information from the distortion of projected strip shadows.
The space-time edge finding technique effectively handles inter-reflection and high light.
The 3-color pattern extends applicability to objects with black textures.
The measurement is fast and independent of object shape complexity.

Conclusions:

The presented method offers a robust, efficient, and versatile solution for 3D shape measurement.
It overcomes key limitations of traditional techniques, enabling broader applications.
The approach provides accurate 3D data with minimal cost and high speed.