Headwall Photonics’ Pushbroom HSI technology enables Hyperspectral Imaging with uncompromised spectral and spatial resolution in remote sensing, machine vision and scientific applications. This scanning method employs a high quality slit + diffraction grating to spectrally disperse incident light from the field-of-view across the imaging plane of a camera. The range of wavelengths depends on the optics and the image sensor technology used: from the ultraviolet and visible (UV-VIS) to the near-infrared (VNIR, NIR, and SWIR) wavelength ranges.
Pushbroom HSI systems are an excellent choice for distinguishing spectral features and detect potentially harmful foreign matter. They provide a means to sort and grade material such as food products, where value is often tied to characteristics that are often better and more consistently measured by an HSI system.
These solutions are bundled as complete scanning systems which include the camera, dual broadband illumination and perClass Mira® stage and software. Lenses may be selected and added, based on the field-of-view & working distance requirements.
Headwall Photonics’ MV.PC computers are small but powerful, and fully configured for hyperspectral data acquisition and analysis. One MV.PC can drive one or two monitors and directly control Headwall sensors and stages, including the perClass Mira Scanning Stage. An MV.PC that has been pre-loaded and tested with drivers & software is highly recommended for easy setup and success.
Users can set up these systems easily and begin scanning known samples to establish ground-truth data. perClass Mira® software allows users to leverage their domain expertise from fields such as fruits, berries, nuts, meat, plastics, coatings, cheese, or chocolate to create and deploy automatic interpretation solutions without programming expertise.
Inspecting such materials involves looking at vastly similar-looking items with small degrees of variability. With pushbroom HSI small deviations from a user-defined “acceptable” quality can be classified and analyzed via perClass Mira® software.
Pushbroom Operation: As shown in the animation below, the field-of-view is imaged by the lens and a strip of light is captured through a narrow slit behind the lens.
Light from each strip is dispersed by a diffraction grating across the focal plane of a camera, producing a (y, λ) image. As the sample moves past the camera a series of (y, λ) images is captured for each “x” position. Thus, every part of the field-of-view is scanned both spatially and spectrally and the resulting data is stacked by software into an (x, y, λ) data cube.
As described above, the spectral content of each spatial line in the field of is captured at a time, moving across the scene to build a full image. In airborne or satellite remote sensing they rely on the movement of the platform to capture lines of spatial data along the trajectory of motion, offering high spatial and spectral resolution. When used in laboratory research environments, a motorized stage is used to move the sample and thus build a full image.
Pushbroom HSI selection table (Inspection & Machine Vision)
Click on a green button within the above table to get more details about a particular camera model.
