Meaning
Optical subsystems that remove long wavelength light from a vision system prevent thermal noise from distorting the image of a manufactured part. The use of telecentric lens infrared filtering is necessary in environments where hot machinery or bright lights would otherwise blur the edges of a measurement. This filtering occurs before the light reaches the digital sensor.
Thermal Suppression
Heat generated by the production process radiates infrared light that interferes with standard imaging. When telecentric lens infrared filtering is active, these unwanted wavelengths are blocked, leaving only the visible light to form the image. This result is a sharp, high contrast picture that is easy for a computer to analyze.
Image Contrast
Differences in light levels between the part and the background are sharpened by removing the infrared haze. If telecentric lens infrared filtering is removed, the measurement software might fail to find the true edge of a component. These failures lead to false rejections of good parts.
Wavelength Selection
Specialized coatings on the lens surface allow only a narrow band of light to pass through the system. Because telecentric lens infrared filtering is tuned to the specific needs of the sensor, it maximizes the accuracy of the optical inspection. This precision is required for checking the tolerances of medical devices or aerospace fasteners.
