Difference Between Red and Blue Light in Color Mark Sensors

The difference between red and blue light in color mark sensors mainly lies in wavelength and application scenarios.

1. Wavelength:

- Red light typically ranges from 630–750 nm (longer wavelength).

- Blue light typically ranges from 450–495 nm (shorter wavelength).

2. Transmission rate:

- Red light often has higher transmission through many materials and can provide clear detection in some cases.

- Blue light may have lower transmission in certain materials but can offer better reflectivity and contrast for reflective or transparent surfaces.

3. Applications:

- Red light is widely used for color classification and detection of targets with broad brightness ranges.

- Blue light is often chosen for high-reflectivity, transparent, or highly reflective surfaces to provide higher contrast and accuracy.

Overall, red and blue light have distinct characteristics and suitable uses in color mark sensors; choose the appropriate light source based on measurement needs.