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VIS and NIR hyperspectral cameras
Wavelength ranges: VIS, NIR, SWIR
A strip in the camera’s field of view is illuminated and an imaging spectrograph produces high-resolution spectral and spatial images through its sensors. This technique is also known as push-broom technology. Figure 1 illustrates how it works:
1. The remitted light of the illuminated strip is imaged through a lens onto the entrance slit of the spectrometer.
2. A mirror illuminates the optical grating.
3. The optical grating splits the light into its wavelengths.
4. A second mirror capable of spectral resolution images the entrance slit onto an image sensor.
5. The spectra of all points along the illuminated strip are imaged onto the sensor. The result is a two-dimensional image of the intensity over location and wavelength.
Due to their significant effect on performance, some technical points are worth mentioning:
Short focal length, Corrected NIR lenses: |
large field of view |
ZEISS optics & Offner setup: |
high-quality spectra |
High-performance image sensor: |
high spatial and spectral resolution, large dynamic range, high measurement repetition rate |
Optimised elektronics: | measurement of extremely fast objects, high throughput |
Fig. 1: Principle of the Offner setup and data processing.
Fig. 2: Principle of our camera in operation.
Product | Techn. Data | Applications |
Multiplexed NIR spectrometer
Wavelength ranges: NIR/SWIR
A strip in the camera’s field of view is illuminated and imaged onto optical fibres arranged in a row. This technique is also called push broom technology. Figure 1 illustrates how it works:
1. The remitted light of the illuminated strip is imaged onto a rotating mirror with an NIR light fibre cable for each location point.
2. This mirror sequentially images the light of all optical fibres onto the entrance slit of the spectrometer.
3. The optical grating diffracts the light and images it onto a spectral line sensor.
4. The location points are then measured one after the other.
Due to their significant effect on performance, some technical points are worth mentioning:
Independent optical fibres: | simultaneous measurement on multiple conveyors |
ZEISS optics: | high spectral resolution, high measurement sensitivity |
RGB colour line scan camera
Wavelength range: VIS
A strip in the camera’s field of view is illuminated. This technique is also called push broom technology. The beam path is shown in Figure 1 as an example. It works in the following way:
1. The reflected light of the illuminated strip is imaged onto a sensor with a colour filter in a Bayer pattern applied to it.
2. The RGB information is detected from these signals.
Due to their significant effect on performance, some technical points are worth mentioning:
Optimised electronics: | measurement of extremely fast objects, hight throughput |
CMOS sensor & ZEISS optics: | high image contrast, low noise |
Fig. 1: Principle of camera in operation mode.
Product | Techn. Data | Applications |
Echelle spectrometer
Wavelength range: UV/VIS
A single point is imaged onto the entrance slit of a spectrograph by means of a single measuring head (optical fibre). Figure 1 illustrates how this works:
1. The sample emits light created by being exposed to short-focused laser pulses (also called LIBS).
2. This light enters the Echelle spectrograph via an optical fibre and a double-slit configuration.
3. An optical grating (Echelle grating) and a prism are used to image the different diffraction orders of the spectrum onto the image sensor.
Due to their significant effect on performance, some technical points are worth mentioning:
DSI optics: (wavelength dispersive height of entrance slit) |
simultaneous use of UV and VIS ranges, outstanding performance in the UV range, extremely low crosstalk between grating orders compared to other Echelle spectrographs. |
ZEISS Optics: | high spectral resolution, very good imaging quality |
Complete system: (spectrograph, camera and electronics) |
easy and safe setup |
ICCD camera | excellent temporal resolution with precisely adjustable and very short exposure time, important precondition for the application of calibration-free LIBS (CFLIBS) |
X-ray fluorescence spectrometer
Wavelength range: X-ray/UV
A strip in the field of view is illuminated, this technique is also called push-and-broom technology.
1. The primary beam, emitted by an X-ray tube, excites the atoms in the irradiated material, which emit fluorescence radiation.
2. The resulting fluorescence is element-specific and measured by means of energy-dispersive detectors.
3. The analysis of the spectra measured in this way allows to identify and determine the elements in the material.
Due to their significant effect on performance, some technical points are worth mentioning:
Water-cooled, high power X-ray tube |
High primary radiation intensity produces high fluorescence radiation intensity |
Silicon drift detectors of the latest generation |
High count rates and best-possible energy resolution |
Complete system (tube, detector and electronics) |
Fast and detailed identification of alloys, not only the main elements |
Fig. 1: Functionality of X-ray fluorescence analysis
Fig. 2: Schematic diagram of our XRF spectrometer in operation
Fig. 3: Generation of X-ray fluorescence radiation
Products | Techn. Data | Applications |
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