Choosing the appropriate color (wavelength) of light is one of these factors. It is also critical to consider ancillary factors such as lighting geometry, pattern, structure, and other elements that may influence the effectiveness of colored lighting for a specific application.
An Overview of Colored Lighting Options for Smart Cameras
|Color||White||Infrared (IR)||Red||Green||Blue||Ultraviolet (UV)|
|Wavelength||WHI||850nm - 1050nm||625nm-660nm||530nm||470nm||365nm - 395nm|
|Benefits||Includes every wavelength of the spectrum||IR light is invisible, so it is suitable in situations where visible wavelengths disturb workers||Typically the least expensive; CCD sensitivity; is usually high||High scattering rate||365nm light can cause materials to flouresce|
|Drawbacks||Difficult to use bandpass filter to avoid interference from ambient light||Double check camera sensitivity, some CCDs are not sensitive in IR range
IR light requires special polarization filters, be sure to use IR lens
|High scattering rate could create noise on an object with many defects||Be aware of safety precautions in environments where humans are present|
|Typical Applications||Color camera applications||For applications requiring that light penetrate through material like plastic such as plastic; where and object needs to be made to be seen through||Any||For inspecting green colored objects such as PCBs or wafers||For applications requiring higher resolution of minor defects||For inspecting glue, adhesives, paint, UV ink|
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