FAQ for Hyperspectral camera models¶
1. What is the special technology or system that differentiates this models from other hyperspectral cameras or applications ?¶
Core technology here is based on applying Fabry-Perot interferometric spectral filters directly on top of every image sensor pixels.
This is quite unique approach of adding Hyper spectral filter at wafer-level to integrate virtually multiple spectrophotometers into the format of an imager with multiple spectral pixel arrays that can be arranged in any possible pattern layout, driven by final application.
2. Is this an "off-the shelf", commercially available hyperspectral imager and camera solutions?¶
In a way it is a special product which is new and in the beginning stages of introduction to the market, but the overall technology of Hyperspectral imaging is known and the USB3 platform is also industry proven and reliable.
Plus there is certain standardization that applies and from which customer can choose from, like:
100 bands line-scan spectral imager solution: here a translation movement is needed to capture the hyperspectral image.
The different hyperspectral bands are realized in vertical direction.
After scanning, both high spatial and high spectral resolution is achieved - after one single scan you get 100 spectral images between 600 and 1000 nm, each with an size of 2048x8 pixels.
Scanning speed is relatively high as it can reach acquisition rate of 2880 lines/s
To simulate a regular linescan camera inspection of a small line a special lens has to be used.
32 bands snapshot tiled spectral imager solution: no translation movement is needed here as this snapshot design enables direct capture of hyperspectral imaging videos for applications such as surveillance or medical.
For snapshot there is planned a model of spectral imager with 32 spectral bands having 256x256pixels spatial resolution each. Real-time capture of hyperspectral images is done at 30-60 data-cubes/s.
The tiled design needs an optical duplicator component (integrated into the camera) that was designed and manufactured together with this sensor.
16 bands snapshot mosaic spectral imager solution: this is a last generation sensor architecture where one spectral filter ‘per-pixel’ is processed on a full mosaic of 4x4 = 16 spectral band cameras integrated on one single chip.
No optical duplicator is needed.
HSI data-cubes can be captured at video-rate with spatial resolution of 512x272 for each of the 16 spectral bands. Additional spatial resolution can be reconstructed with specific de-mosaicing algorithms.
3. Can the range and FWHM (Full width at half maximum) of the 16 or 32 bands be defined before every acquisition or once the filters are glued on sensor nothing can be changed ? (e.g. select certain wavelengths such as 630, 670 and a fwhm at 10nm).¶
Important to understand is that filters are not "glued" to the sensor - they are deposited ‘monolithically’ at wafer-level onto the CMOS sensor pixel directly, with the same equipment / process / fab infrastructure that is manufacturing CMOS image sensors.
So the design of the filter is fixed - cavity is fully solid and reliable. This means they are NOT tunable anymore once processed.
Today there are 3 types of sensors available “off-the-shelf” (please check with our sales for details) and more coming into roadmap during the year.
4. Are there any simulations or measurements regarding the Field of View (FOV) at a given distance, the pixel size (in meters, spatial resolution), with certain lens? How do you calibrate signal to noise ratio and is the calibration required frequently?¶
5. Is the camera ready to use out of the box ?¶
In general for this product it is critical to be familiar with the technology itself.
Camera as is delivers RAW data in a form of a datacube, which next needs to be processed by different types of software. The type you use depends on the application specifics or basically on what you want to analyze with the camera.
Furthermore, there are certain procedures and accessories that are to be implemented while utilizing Hyperspectral cameras.
A set of a high and low pass filters has to be used to retain second order response of the sensor filters. For applications that do not require spectral analysis, such as classification, the full active range can be used.
Having experience in the field of Hyperspectral imaging definitely helps or is even a condition when working with such a camera.