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Qingdao Senquan Optoelectronics Co., Ltd
The correct use of near-infrared hyperspectral imaging cameras is the key to unleashing their technological potential
Date: 2025-12-01Read: 20
Near infrared hyperspectral imaging camera is a sensing device that integrates optical, spectral, and imaging technologies. It can simultaneously obtain spatial information and continuous spectral features of targets in the 900-1700nm or wider wavelength range. It is widely used in agricultural monitoring, food quality inspection, pharmaceutical analysis, resource exploration, and scientific research fields. With the advantage of integrating graphs, it achieves non-destructive, rapid, and visual identification of material components. However, this device has high requirements for operating environment, calibration process, and data processing. Improper use can easily lead to spectral distortion, image blurring, or analysis failure. Mastering the correct usage of near-infrared hyperspectral imaging cameras is the key to unlocking their technological potential.
1、 Preparation before use: dual guarantee of environment and calibration
Lighting condition control: Prioritize working under uniform natural light or standard halogen/LED light sources to avoid spectral fluctuations caused by direct sunlight or flickering light sources; It is recommended to use an integrating sphere or diffuse reflection lighting system indoors;
Dark current and whiteboard calibration:
Dark reference: Turn off the light source and capture noisy images in a dark state;
White reference: Use a standard Spectralon whiteboard (reflectivity ≥ 99%) to collect benchmark reflection data;
Every time the ambient light changes or the device is turned on, it needs to be recalibrated to ensure accurate reflectivity calculation.
2、 Equipment setup and parameter setting
Stable platform installation: The camera must be fixed to a tripod, slide rail, or drone gimbal to avoid image misalignment caused by shaking;
Reasonably set exposure time and frame rate:
Exposure that is too long can lead to saturation, while exposure that is too short can result in low signal-to-noise ratio; Suggest starting the trial adjustment from 10-50ms;
Mobile platforms (such as conveyor belts) need to synchronize triggering signals to ensure spatial continuity;
Lens selection: Choose a fixed focus lens according to the field of view requirements to avoid spectral distortion caused by zooming.
3、 Sample Placement and Collection Standards
Sample flatness and uniformity: Granular samples (such as grains and tablets) should be laid in a single layer to avoid shadows and overlaps;
Background uniformity: Use a black non reflective background plate to reduce stray light interference;
Avoid strongly reflective surfaces: Metal or mirror materials require special treatment (such as spraying matte coatings), otherwise spectral distortion will be severe.
4、 Data collection and real-time monitoring
Start the acquisition software and preview whether the spectral cube (Spatial × Spatial × Spectral) is complete;
Observe whether the key bands (such as 1450nm water absorption peak and 1200nm oil characteristics) are clear and distinguishable;
The single collection time should not be too long to prevent the stability from being affected by the temperature drift of the light source.
5、 Key points for shutdown and maintenance
Close the capture software first, and then disconnect the camera power supply;
Cover the lens promptly and store it in a dry and dust-proof box to prevent moisture from condensing in the sensor window;
Regularly blow clean compressed air to the heat dissipation holes and interfaces, and it is strictly prohibited to touch the lens or detector window with hands.