1000nm Bandpass Filter

Situated in the near-infrared (NIR) spectral region, 1000nm light exhibits moderate penetration through organic and inorganic materials while minimizing interference from visible light sources, making it ideal for applications requiring low visible noise and selective spectral transmission.

Application 1: Photoelectric Sensor Calibration - Employed to isolate ambient light, this filter ensures only 1000nm wavelength signals pass through, enhancing the precision of sensor responses in calibration systems for optical devices that rely on near-infrared signal detection, such as photovoltaic cells or IR transceivers.

Application 2: Biomedical Diagnostics - In non-invasive medical devices (e.g., pulse oximeters or glucose monitors), the filter blocks autofluorescence and ambient light interference, enabling accurate capture of 1000nm transmitted/reflected light to improve the reliability of physiological parameter measurements through tissue.

Application 3: Remote Sensing & Imaging - Integral to hyperspectral imaging systems, it eliminates out-of-band radiation, concentrating on the 1000nm spectral band to enhance contrast in applications like vegetation health assessment (via water content analysis), semiconductor wafer inspection, and atmospheric gas sensing where narrow-band spectral purity is critical for data accuracy.

US7477309B2 - Infrared camera system and method

Context: This patent describes a multi-spectral infrared camera system designed to capture images of subjects (such as people or vehicles) through various environmental obscurants. It utilizes a mechanism to switch between different narrow-band filters.

Usage of Filter: The 1000 nm bandpass filter is used as one of several discrete filters mounted on a selectable filter wheel or switching mechanism positioned in the optical path between the lens and the detector. The patent explicitly describes an embodiment containing filters centered at 700 nm, 800 nm, 900 nm, and 1000 nm.

Function: The filter functions to spectrally isolate a narrow slice of the infrared spectrum (approximately 4$\pm$ 20 nm around the 1000 nm center).5 It blocks visible light and other infrared wavelengths that might be scattered by fog, smoke, or windshield glass.

Result: The system achieves enhanced target contrast and visibility. By isolating the 1000 nm wavelength, the camera can "see" details that are invisible to the naked eye or washed out in broadband images, effectively filtering out visual noise and improving detection reliability.

US11280884B2 - LIDAR instrument and method

Context: This patent describes a LIDAR system used for autonomous vehicle navigation, which emits laser pulses and detects reflections to measure distance. It focuses on the optical architecture for handling the transmit and receive paths.

Usage of Filter: The bandpass filter is used as a solar background rejection filter placed immediately before the receiver (avalanche photodiode or detector array). It is matched to the specific laser wavelength (in the NIR/SWIR region, such as 1000-1550 nm).

Function: The filter functions to block ambient solar radiation and stray light while allowing the specific narrowband laser return signal to pass through to the detector.

Result: The instrument achieves a high Signal-to-Noise Ratio (SNR). By eliminating the background noise from sunlight (which is broad spectrum), the system can detect faint reflections from distant objects, significantly increasing the effective range and accuracy of the LIDAR data.

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