컬렉션: 850nm 대역 통과 필터

Context: A multispectral camera system designed for Unmanned Aerial Vehicles (UAVs/Drones), primarily used in precision agriculture to monitor crop health.

Usage of Filter: The 850nm bandpass filter is integrated into one of the four distinct optical paths (lenses) of the camera array.

Function: It strictly isolates the Near-Infrared (NIR) wavelength band (centered at 850nm) from the incoming sunlight reflected by the plants, blocking visible light frequencies (Red, Green, Blue).

Result: By capturing a pure 850nm image and comparing it with a separate Red (e.g., 660nm) image, the system can calculate the Normalized Difference Vegetation Index (NDVI). This allows farmers to determine the chlorophyll content and stress levels of crops invisible to the naked eye.

Context: A LiDAR (Light Detection and Ranging) sensor assembly used for autonomous vehicle navigation and mapping.

Usage of Filter: The bandpass filter is located in the "return path" of the optical system, situated between the receiving lens (specifically a ring lens design) and the avalanche photodiode detector.

Function: It serves to "clean" the incoming signal. It permits the passage of the specific laser wavelength (in this case, matching an 850nm emitter) reflected off objects, while filtering out solar background radiation and stray light scattering.

Result: This ensures the precise timing of the laser pulse's return (Time-of-Flight measurement), resulting in accurate distance calculation and high-fidelity point cloud generation without "ghost" points caused by light interference.