Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here




looking for sheet retroflectors. all the stuff we've found is for the safty/automotive industry and not of good enough quality for our app. an body know of anyone making better stuff for 'scientific' or display applications?


RE: retroflectors

How good a retroreflector do you need?


RE: retroflectors

Well that's a good question that I have no idea how to answer. Is there some way to quntify the performance of this stuff? Here's what I do know:
This is a visual imaging app. where an image from an LCD is reflected and magnified several times. Right now the retrofeflector causes the image to be quite 'hazy' or soft. This, presumably, is caused by the ideally sharp angles of the corner-cube detail being slightly rounded or imperfect which disperses the incident light in a random manner. At the end of the day we need material where this geometry is as good as possible and the 'peaks and troughs' of the individual facets are as sharp as possible. Right now we're using a 'sign' type material from  Reflexite.
Any help would be appreciated.

RE: retroflectors

I'm not sure that given the described application that it makes sense to have any retroreflectors at all.  PLX is one company that makes retroreflector arrays, but even the smallest one they make will probably outcost and outweigh your entire system:


Is there no other way to accomplish what you need?  What are the dimensions involved, IFOV's, etc.?  

Based on the limited information and some outright guessing, you'd better performance than obtainable from any commercially inexpensive retroarray.  Both the surface intersections and the actual angles of intersection are going to impact your application.  

I'm having a lot of trouble imagining where you might use a retroreflector, as there are many applications where a retroreflection is more easily obtained by using a plane mirror that's aligned in-situ.


RE: retroflectors

It's been a couple years since I've needed one, but if memory serves correctly, retroreflectors won't flip an image around when you look at it (unlike a conventional mirror).  They are kind of difficult to make so they cost a lot of money.. the more you spend, the better the reflection will be.  Obviously, you want the image to come right back on itself and not at an angle.  We tested this by shining an IR source (laser pen) directly at it and looked at where the image (red dot) veered off to.  We first made sure the pen and retroreflector were in alignment.  I believe Newport or Thorlabs carries very high quality retroreflectors...

Good Luck!


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close