Part of the Microprocessors glossary:

Texture sensing is the ability of a robot end effector to determine whether a surface is smooth or rough. There are several ways to do this; the simplest method involves reflected light.

A laser beam and photoreceptors can be used to tell the difference between a smooth surface and a rough or matte surface with high albedo (low light absorbtion). A shiny surface, such as a sheet of polished metal or a pane of unfrosted glass, behaves according to the principle that the angle of reflection equals the angle of incidence relative to a plane tangent to the point of incidence. A matte surface, such as a sheet of printer paper, scatters incident light rays. If several photoreceptors are set up to capture reflected light, a shiny surface will reflect the beam back only to a receptor that is positioned in the path of the beam whose reflection angle equals its incidence angle. The matte surface will reflect the beam back to all the receptors.

A laser-based texture sensor cannot accurately measure the degree of roughness of a surface that is not shiny. A piece of printer paper reflects visible light in much the same way as a layer of flour, sand, or gravel. In addition, a visible-light-based texture sensor does not work well against rough or matte surfaces with low albedo. Such a surface, such as carbon black, produces a negative response at the photoreceptors. For surfaces of this type, high-speed electrons, infrared ( IR ) rays, or ultraviolet (UV) rays sometimes work. But efficient emitters and receptors of these forms of energy are expensive.

Also see proximity sensing , pressure sensing , and robotics .

This was last updated in September 2005
Posted by: Margaret Rouse

Related Terms

Definitions

  • cache memory

    - Definition: Learn what cache memory is, what it has to do with RAM, how it is categorized and how it is configured. (SearchStorage.com)

  • quad-core processor

    - A quad-core processor is a chip with four independent units called cores that read and execute central processing unit (CPU) instructions such as add, move data, and branch. (WhatIs.com)

  • embedded device

    - An embedded device is an object that contains a special-purpose computing system. The system, which is completely enclosed by the object, may or may not be able to connect to the Internet. (WhatIs.com)

Glossaries

  • Microprocessors

    - Terms related to microprocessors, including definitions about silicon chips and words and phrases about computer processors.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About texture sensingPowered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.