BP625-40 Bandpass Filter(CWL=625nm,FWHM=40nm)

Machine Vision & Industrial Inspection - Ambient Light Blocking

The OD5 blocking ensures that sunlight, overhead fluorescent light, or other machine lights do not interfere with the sensor, allowing only the 625 nm red inspection light to pass.

Recommended Light Sources

• Red LEDs (625 nm or 630 nm): This is the most ideal match. A 625 nm LED emits almost all its power directly through this filter. This combination creates a monochromatic imaging system that is immune to ambient light.
• Red Laser Diodes (635 nm): Common red lasers often operate at 632.8 nm (HeNe) or ~635 nm (diode). Both fall perfectly within the 40 nm bandwidth of this filter.
• For Fluorescence Applications (Excitation Source): If the filter is used to detect (emission), you need a light source to excite the sample. You should use a Green or Yellow LED/Laser (approx. 530 nm – 590 nm). The filter will then block this green excitation light (due to the OD5 blocking) and only let the red fluorescence pass through to the camera.

Agricultural / Vegetation Analysis

While Chlorophyll analysis typically uses 660nm+, the 625nm range can be used in multi-spectral imaging to measure specific reflectance bands associated with plant pigments (anthocyanins).

Recommended Light Sources

1. Active Illumination (Indoor / Machine Vision)

• Source: Red LEDs (Center Wavelength: 625 nm or 630 nm)
• Why it is best: This is the most efficient choice for controlled environments (e.g., sorting lines, greenhouses, or leaf scanning stations).Matched Spectrum: The LED emits light that matches your filter's passband perfectly.Efficiency: You do not waste energy generating blue or green light that the filter would just block.Contrast: High anthocyanin content (red/purple pigmentation) will reflect this light strongly, appearing bright white to the camera. High chlorophyll content (green tissue) will absorb more of this red light, appearing darker.

2. Passive Illumination (Outdoor / Drone / Field)

• Source: Sunlight
• Why it is best: For remote sensing (drones/satellites), the sun provides a broad spectrum that includes plenty of 625 nm energy.Role of the Filter: The BP625-40 filter sits on the camera lens to block all the UV, Blue, Green, and Near-Infrared (NIR) sunlight, ensuring the sensor only records the specific 625 nm "Red" band data needed for your multi-spectral indices (like ARI - Anthocyanin Reflectance Index).

3. Lab / Benchtop

• Source: Broadband White LED or Halogen (Tungsten)
• Why: If you need to perform multiple analyses (e.g., RGB + 625nm + NIR) simultaneously, a white light source covers all bands. The BP625-40 filter will extract just the red band for the dedicated sensor.