850 nm absorbing material Log Out | Topics | Search
Moderators | Register | Edit Profile

NIR Discussion Forum » Bruce Campbell's List » I need help » 850 nm absorbing material « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Giacomo Cocci (jcoach)
New member
Username: jcoach

Post Number: 2
Registered: 6-2012
Posted on Thursday, June 07, 2012 - 3:12 am:   

Hi, I wish to thank you for your welcome and advices. I'll have a talk with some belt suppliers asking specifically for these requirements. Those are all new issues for me, but I'm glad I found this helpful forum.
Top of pagePrevious messageNext messageBottom of page Link to this message

Gabi Levin (gabiruth)
Senior Member
Username: gabiruth

Post Number: 71
Registered: 5-2009
Posted on Thursday, June 07, 2012 - 2:02 am:   

Hi Giacommo,

To find a specific material that absorbs only in and around 850 will be an absolute impossible task. But if absorbing almost the entire spectrum from visible to beyond the NIR is acceptable then any belt that is made from material that contains even less than 5% carbon black, which is usually the case with all black appearing plastics, then it will be very useful in reducing your 850 reflectance from the belt to practially nil.

I hope this helps you,

Gabi Levin
Brimrose
Top of pagePrevious messageNext messageBottom of page Link to this message

Howard Mark (hlmark)
Senior Member
Username: hlmark

Post Number: 480
Registered: 9-2001
Posted on Tuesday, June 05, 2012 - 11:51 am:   

Giacomo - welcome to the discussion group.

I can't say that I know of a specific type of belt, but in general I would expect that a material containing carbon black will tend to be non-reflective. Carbon black absorbs at all NIR wavelengths (as well as in the visible and other regions), so the more carbon black in the material the darker it will be. You'll have to balance that property against other properties that might be important (strength, etc.). However, it usually doesn't require much carbon black to absorb a lot of light.

The best thing would be to talk to belt manufacturers and get their recommendations. If you can get some samples of their belt materials, ir shouldn't be difficult to evaluate them in a static measurement setup.

Howard

\o/
/_\
Top of pagePrevious messageNext messageBottom of page Link to this message

Giacomo Cocci (jcoach)
New member
Username: jcoach

Post Number: 1
Registered: 6-2012
Posted on Tuesday, June 05, 2012 - 10:26 am:   

Hi, I'm not a NIR expert, thus the question could be a bit trivial.
I've come across an application where well-NIR-reflective objects have to be clustered into different groups by ccd camera inspection: I'm using a 850nm lighting, and the objects are pretty distinguishable, the problem is that the conveyor belt that's being used (a blue PVC belt) is also reflecting some NIR light. I was wondering, are there particularly high-NIR-absorber materials that are usually utilized for the production of belts?
Thanks in advance for any suggestion,

Add Your Message Here
Posting is currently disabled in this topic. Contact your discussion moderator for more information.