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1200-1800nm SWIR Filter
This filter isolates the 1200-1800nm short-wave infrared (SWIR) band, engineered specifically for QHYCCD's InGaAs sensor cameras like the QHY990 to enable specialized scientific and astronomical imaging.
SWIR Imaging: Isolating the 1200-1800nm Wavelength Range
Designed for short-wave infrared applications, this filter transmits light only within the 1200nm to 1800nm window. This precise bandpass is critical for imaging subjects that are invisible in the visual spectrum, revealing details in atmospheric studies, agricultural analysis, and deep-sky objects with unique SWIR signatures.
QHYCCD's own official sample images for the QHY990, covering both daytime and night-sky targets, were captured using this 1200-1800nm filter. This demonstrates its effectiveness when paired with a sensitive InGaAs sensor and fast optics like a 16mm f/1.4 SWIR lens to produce high-contrast results.
QHY990 Integration: Filter Holder and C-Mount
This SWIR filter is made to integrate seamlessly with QHYCCD's SWIR camera ecosystem. QHY990 series cameras include a 25mm filter holder for installing a SWIR filter.
The filter mounts behind the camera's C-mount interface. This placement is compatible with the QHY990's native 17.5mm back focus, ensuring that you can achieve proper spacing with C-mount lenses and other accessories without focus issues.
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What is the primary use of the 1200-1800nm SWIR Filter?
The primary use is to isolate a specific portion of the short-wave infrared spectrum. It is designed for specialized applications with InGaAs sensors, such as those in the QHYCCD QHY990, for scientific, industrial, and astronomical imaging where targets emit or reflect light in the 1200nm to 1800nm range.
Which QHYCCD cameras are compatible with this 1200-1800nm filter?
This filter is explicitly compatible with QHYCCD's short-wave infrared cameras that use an InGaAs sensor, with the QHY990 being the primary example.
Can I use the 1200-1800nm SWIR Filter with a QHY990 for security or agricultural monitoring?
Yes. SWIR imaging in the 1200-1800nm band is effective for daytime applications like agricultural analysis (e.g., assessing crop health) or security, as it can see through atmospheric haze better than visible light. QHYCCD has demonstrated its use for daytime imaging in their own sample photos.
How would the 1200-1800nm SWIR Filter perform for night-sky imaging with a QHY990 and a fast lens?
This is an ideal combination for advanced astro-imaging. QHYCCD's own night-sky sample images were taken with this filter, a QHY990, and a fast 16mm f/1.4 SWIR lens. This setup is excellent for capturing faint infrared emissions from celestial objects that are not visible in traditional LRGB or narrowband filters.
Why is this 1200-1800nm filter specified for InGaAs sensors like the one in the QHY990?
Standard silicon-based CMOS/CCD sensors lose sensitivity dramatically beyond 1000nm. InGaAs (Indium Gallium Arsenide) sensors are specifically designed to be highly sensitive in the SWIR range. This filter's 1200-1800nm bandpass falls within the sensitivity range of InGaAs sensors, ensuring maximum signal and minimal noise from out-of-band wavelengths.
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