Has a Light Plane sensor been invented?

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    Light Plane Sensor
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Discussion Overview

The discussion centers around the existence and functionality of a "Light Plane" sensor, specifically for measuring the speed of a ball before and after it bounces. The inquiry involves exploring various sensor technologies and their applicability in accurately detecting interruptions in a light beam.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the existence of a "Light Plane" sensor that can detect interruptions in a light beam to measure speed changes in a bouncing ball.
  • Another participant suggests using an array of independent photodetectors with a conical light source to achieve the desired measurement.
  • A different approach proposed involves using a photovoltaic cell to measure current as a means of detection.
  • One participant mentions the possibility of using a CCD chip for the measurement task.
  • Another participant raises the idea of utilizing ultrasound or radar as alternative methods for measuring speed.
  • A suggestion is made to look into "light curtains," which are used in industrial applications as safety barriers and consist of an array of photo sensors and LEDs.

Areas of Agreement / Disagreement

Participants present multiple competing views regarding the technology and methods for measuring speed, indicating that there is no consensus on a single solution or approach.

Contextual Notes

There are limitations related to the accuracy of traditional light beam measurements, as noted by the original poster, which depend on the alignment of the beam with the center of the ball. Additionally, the discussion does not resolve the cost implications of suggested technologies.

Who May Find This Useful

This discussion may be of interest to students and professionals in physics, engineering, and technology fields, particularly those exploring sensor technologies and measurement techniques.

NickC
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Has a "Light Plane" sensor been invented?

Hi,

Does a "Light Plane" exist or has one been invented? What I need is a light beam sensor that acts on a plane, showing a difference in voltage if any part is blocked or interferred with.


I'm a college student trying to come up with ways to accurately measure the speed of a ball before & after it has bounced, to calculate the change in kenetic energy. The problem is with a traditional light beam, the readings are only accurate if they go right through the very centre of the ball.

Any thoughts?

Nick.
 
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You could use several independent photodetectors in an array, with one conical light source illuminating all of them.

You could use a photovoltaic cell, and measure the current it is producing.

You could use a CCD chip.

- Warren
 
As far as measuring speed, have you considered using ultrasound or radar?

- Warren
 
Do a search on LIGHT CURTAIN. These are relatively common in industry, generally used as safety barriers. Break the "light curtain" shut the equipment down.

I believe that they are simply an array of photo sensors and LEDs.

Edit:

I googled it for you this is Banner there are other manufactures as well.

How much $$$ are you willing to spend.
 
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