850nm 대역 통과 필터

850nm 대역 통과 필터는 850nm 근처에 중심을 둔 선택된 근적외선 대역을 전송하는 동시에 원치 않는 대역 외 빛을 줄이도록 설계되었습니다.

적용 분야:
- 850nm NIR LED 또는 VCSEL 소스 정리
- 머신 비전, 야간 투시 및 NIR 카메라 이미징
- 실리콘 포토다이오드, CMOS/CCD 카메라 또는 NIR 센서 전의 검출기 측 850nm 신호 격리
- 단거리 광 감지 및 반사 감지 시스템
- 850nm 멀티모드 파이버, 광통신 및 테스트 설정

대역폭 옵션:
- 좁은 850nm 레이저 또는 VCSEL 신호 격리용 1.2nm 및 10nm FWHM
- 수신기 측 필터링 및 광 감지용 20nm, 25nm 및 30nm FWHM
- NIR LED 조명, 머신 비전 및 카메라 측 신호 레벨용 40nm, 45nm, 50nm, 70nm 및 100nm FWHM

LED, VCSEL 또는 레이저 스펙트럼, 검출기 감도, 주변 배경, 차단 범위 및 필요한 NIR 신호 레벨을 기반으로 대역폭을 선택합니다.
850nm Bandpass Filters
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필터

10개 품목
중심 파장(nm)
반치폭(nm)
광학 밀도(OD)

필터

중심 파장(nm)
반치폭(nm)
광학 밀도(OD)

Selection Guide

850nm NIR LED or LED array

Use CWL 850nm with 40–100nm FWHM for NIR LED illumination, machine vision, night-vision imaging, or camera-based inspection.

850nm LEDs have broader emission than laser or VCSEL sources. Wider filters help keep usable NIR illumination for cameras while reducing visible light and unwanted spectral background. Use 40–50nm FWHM for more controlled NIR illumination, or 70–100nm FWHM when image brightness is the main requirement.

850nm VCSEL or laser diode

Use CWL 850nm with 1.2–10nm FWHM for 850nm VCSEL or laser diode signal isolation.

850nm VCSELs and laser diodes are narrow sources compared with LEDs. For source cleanup or receiver-side isolation, key specs include CWL match, FWHM, transmission at 850nm, and OD blocking across the detector-sensitive wavelength range.

Machine vision and NIR camera imaging

Use CWL 850nm with 40–100nm FWHM for NIR machine vision, surveillance imaging, alignment, or contrast enhancement.

For CMOS and CCD camera systems, 850nm filters can help isolate the NIR illumination band and reduce visible-light background. Wider FWHM options are often practical when the task depends on image brightness, contrast, and stable camera response.

Detector-side 850nm signal isolation

Use CWL 850nm with 10–30nm FWHM before a silicon photodiode, CMOS/CCD camera, or NIR-sensitive detector when the target signal is near 850nm.

For detector-side filtering, the filter improves signal-to-background ratio by passing the 850nm signal and reducing unwanted ambient or source background. Use 10nm FWHM for stronger 850nm isolation, or 20–30nm FWHM when more signal level is needed.

Application Note

US10574911B2 - Multispectral imaging apparatus

US10574911B2 - Multispectral imaging apparatus

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.

US10928485B2 - Lidar ring lens return filtering

US10928485B2 - Lidar ring lens return filtering

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.

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