ASK THE EXPERTS
Lighting Equipment Questions
Is there a light combination that can take pictures of light brown plastic bottle with water droplets to detect if the cap is on straight or if it is crooked? Cap is just slightly darker than bottle. Water droplets are causing problems. Can a blue light help or an IR backlight?
- = Company Profile
- = Answered Questions
If space allows, a back light would make it easier. An IR wavelength, say 850 nm, may or may not help "see through" the water. Be sure your camera is sensitive enough in the near IR range, with any internal IR filter removed. Shorter wavelengths (closer to 800 than 900 nm) transmit better through typical lenses. You might also find that a polarizer/analyzer combination helps.
If the requirement is to solely look at the orientation of the cap then you could use a laser line across the top of the cap to visualize the general height profile of the cap as it is pass by a given point. This generated height map will tell you if the cap is tilted.
Hello John, Determining which wavelength of light will provide the best contrast for optimal image quality is not always so easy. However, we offer a great tool which will certainly help! Here is a link to our FK200 Machine Vision Filter kit.... http://midopt.com/filter-kits/fk200/ .....The filters within this kit are designed to mimic the spectral output of common LED wavelengths used in MV applications. Therefore, you can simply test with filters and ideally a broad spectrum light source (such as sunlight) to figure out which wavelength is ideal. Once the best wavelength is determined, you now can purchase the appropriate light and use the bandpass filter to control the variability of ambient light which may interfere with image quality. Our MV filters are a very simple way to test for not only this application but any others you have coming up in the future. I hope this helps. Please feel free to reach out with any questions you may have. Good luck! Jason
John, We may be able to assist you with this application, The following is an application that we have done. http://smartvisionlights.com/applications/water-bottle-cap-seal-fill-inspection If you have further questions about this, please feel free to contact Chris Gray at firstname.lastname@example.org, or call our office at 231-722-1199 and ask for Sean in Tech support, Regards, Dave Spaulding