Block Unwanted Light

MidOpt_Block_Unwanted_LightMidOpt filters have the unique ability to control the quality and quantity of light, block all unwanted ambient light, pass only the output of light necessary for inspection and significantly increase contrast and resolution. This results in improved system accuracy, long-term repeatability and unmatched stability. Using affordable MidOpt optical filters also eliminates the need for costly shrouds, saving space and money.

› View Bandpass Filters

Applications Solutions

  • Block Unwanted Light
    Before: Ambient light interferes with detection of a 2D matrix code on a reflective metallic part illuminated with a red 625nm LED light.
    After: Using a BP635 Light Red Bandpass filter over the lens together with red LED illumination, the filter removes reflected ambient light and lightens the appearance of the 2D code to improve overall image quality.
  • Block Unwanted Light
    Before: The presence or absence of green thread sealant is difficult to detect on bolt threads. The parts are illuminated with 625nm red LED lighting.
    After: In a monochrome application, a BP635 Light Red Bandpass Filter placed over the camera lens used in conjunction with red LED illumination results in areas with green sealant appearing almost black in color.
  • Block Unwanted Light
    Original Color Image
    Before: Without a filter and illuminated under strong ambient white light, there is not enough contrast to be able to reliably read the inkjet date/batch code printed in blue on the bottom of a red plastic coffee can.
    After: A BP635 Light Red Bandpass Filter mounted to the lens, together with 625nm red LED lighting, greatly lightens the background while darkening the printed code. The printed numbers and lettering become much easier to read.
  • Block Unwanted Light & Reduce Glare
    Before: Lack of contrast between the cookie dough and chocolate chips, in addition to cellophane packaging glare caused by ambient light, challenges the accurate counting of chocolate chips in cookies.
    After: A BP660 Dark Red Bandpass Filter mounted on the lens lightens reflections and blocks interfering ambient light, resulting in improved contrast.
  • Block Unwanted Light
    Before: Wide angle background noise from 532nm laser excitation introduces a bright halo in this image taken through a microarray reader.
    After: An LP550 Orange Longpass Filter blocks the 532nm laser and passes the emission wavelengths – of which there are multiple in this case. Because the LP550 is an absorptive filter glass, it is insensitive to wide angle incident light impinging on the filter. Dichroic (reflective) filters did not achieve acceptable results.