BP650-40 带通滤光片(CWL=650nm,FWHM=40nm)

Agricultural Drones and Plant Health Monitoring

Healthy plants absorb red light to use for photosynthesis. Drones flying over crop fields use cameras equipped with this filter to measure exactly how much red light the leaves are reflecting. By looking at this specific red light data, farmers can easily spot sick, diseased, or thirsty plants from the sky before the damage is visible to the naked eye.

Recommended light source:

• Natural Sunlight: The sun naturally provides the full spectrum of light. It acts as the ultimate free light source, and the filter simply acts as sunglasses for the drone, isolating just the red light bouncing off the crops below.
• Full-Spectrum Grow Lights (LED or Halogen): For indoor farming or greenhouses, these provide the necessary broad light, allowing the filtered camera to analyze plant health indoors regardless of the time of day or outside weather.

Barcode Scanners and Optical Readers

When you scan an item at a grocery store, the scanner uses a red light to read the black-and-white lines. This filter sits over the scanner's digital "eye" to block out the bright fluorescent store lights. This ensures the scanner only sees the clean reflection of its own red light, reducing errors and making scanning instant.

Recommended light source:

• 650nm Red Laser Diodes: They produce a highly concentrated, bright red beam that travels well over a distance. This ensures the scanner can read barcodes quickly, accurately, and from different angles.
• Red LEDs: A safer, cheaper, and more durable alternative to lasers. They are perfect for short-distance, handheld scanners, like the ones used for reading QR codes on a mobile phone screen.