Midopt Training

Posts tagged with Bandpass Filters

Creating Contrast for Plastic Surface Inspection with a UV Light and Bandpass Filter

Using a UV light source without a filter over the lens creates insufficient contrast for inspection. When a UV light source is used together with a MIDOPT® BP324 UV Bandpass Filter on the lens, the contrast dramatically improved allowing for clear inspection of the surface defects on the plastic.

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Application

Creating Contrast for Plastic Surface Inspection with a UV Light and Bandpass Filter

Illumination by a UV light source without a filter over the camera lens does not provide enough contrast to differentiate …

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Creating Contrast for Optical Character Recognition on Reflective Metal Parts

In this application, UV light is overpowering the blue fluorescence emitted by this part making inspection difficult. A BP470 Blue Bandpass Filter over the lens blocks the UV light, and passes only the blue emission of the characters, producing excellent contrast in the final result.

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Application

Creating Contrast for Optical Character Recognition on Reflective Metal Parts

In this application, UV light is overpowering the blue fluorescence emitted by this part making inspection difficult.

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Create Contrast Between Two Different Materialsof the Same Color

In this application we demonstrate the benefits of using a MidOpt® optical filter to help create excellent contrast in a machine vision inspection application in the infrared (IR), at the 830-850nm range.

Application

Create Contrast Between Two Different Materialsof the Same Color

Achieve contrast in machine vision inspection applications operating in the near-infrared (Near IR), at the 830-850nm range.

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Maximizing Contrast for Character Recognition

A MidOpt® BP470 Blue Bandpass Filter is placed over the camera lens resulting in excellent contrast. By blocking the yellow portion of the spectrum, the material background is darkened allowing the white lettering to greatly stand out.

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Application

Maximizing Contrast for Character Recognition

MidOpt® BP470 Blue Bandpass Filter is placed over the camera lens resulting in excellent contrast. ced over the camera lens resulting in excellent contrast. By blocking the yellow …

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UV Fluorescence Paint Marker Inspection

When a railroad tie with a metal endplate runs through vision inspection, a UV (325nm) light is used with a BP525 Light Green Bandpass Filter to ignore (block) the reflection from the end-plate and pass only the emission of the fluorescent paint marker in order to determine orientation of the tie.

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Application

UV Fluorescence Paint Marker Inspection

When a railroad tie with an endplate runs through vision inspection, a UV (325nm) light is used with a BP525 (500nm – 555nm) Light Green Bandpass Filter …

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Performance

The MidOpt Gaussian Passband

The spectral output from a single color LED light source used in any vision application typically follows a normal Gaussian or “bell shape” profile.

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UV Machine Vision Application
UV Machine Vision Application

Fluorescence Inspection of Code Marking

A UV light and monochrome camera is used to illuminate a black ink cartridge with a blue code marking. Using a MidOpt® BP470 Blue Bandpass Filter only the emission from the blue ink code is captured and all other light blocked, creating sufficient contrast.

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Application

Fluorescence Inspection of Code Marking

A UV light is used with a monochrome camera and blue bandpass filter in order to improve contrast of a blue code printed on a black ink cartridge …

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