CELERA P series

Get more out of the light. Discover the new dual-USB3 polarization camera from Alkeria.

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CELERA necta s grad serieshalconcognexCmountFmountFusionView

Get more out of the light

Standard digital monochrome sensors capture light intensity and wavelength for each pixel: however, some applications require the inspection of polarized light to get relevant information.
Instead of using external polarizing filters, Alkeria developed CELERA P, a new camera model featuring a special polarization image sensor.
Thanks to its unique array of polarizer filters overlaid on top of the sensor's pixel array, CELERA P gets rid of all the external polarizing filters, combining the ease-of-use of the Alkeria USB3 cameras with the advanced capabilities of polarization imaging and unique FusionView feature.

Based on the dual-USB3 platform of CELERA cameras, CELERA P is capable of reaching up to 152 fps while processing something like ~200 million vectors per second. Thanks to its powerful FPGA architecture in fact, CELERA P can execute polarization detection directly on-board, without overloading the computer.

Why polarized light?

Light is an electromagnetic radiation characterized by its intensity, frequency, propagation direction and polarization. The latter expresses geometrical properties of the wave oscillation: a light wave oscillating in a single plane is said to be linearly polarized.
Polarized light is essential in all those applications where you need to inspect objects made on transparent or highly reflective surfaces, such as glass, plastic or metal. In these cases you can reduce reflections by filtering all the unnecessary light waves, picking only the essential information from selected polarization angles.
Polarized light can also facilitate all those applications where it's necessary to inspect curved surfaces, low-contrast objects, detection of internal tensions, particles or scratches in transparent materials, and so on.

CELERA P Polarized lightimage by Fffred via Wikipedia CC BY-SA 3.0

Polarizing sensor vs filter

Standard cameras with monochrome or color sensors are only able to measure light intensity or wavelength: they cannot tell apart different polarization states.
To get information about light's polarization, special filters can be used. Polarizer filters absorb all the components of light with random angles, allowing only the light with a specific polarization angle to pass. Those filters usually are mounted in front of camera lenses: if you need to change polarization acquisition parameters, you need to mechanically change the orientation of the filter.
SONY, however, developed a machine vision global shutter sensor, featuring an unique array of polarizer filters overlaid on top of the pixel array and beneath the micro-lenses. Thanks to this technology, camera sensor directly acquires the data on light polarization without any additional filter on top of the lens, thus reducing system complexity.
Each pixel is provided with a dedicated polarized filter. Those filters are orientated 0°, 45°, 90° e 135°, and arranged in a 2x2 pixel array.

How sensor's polarization filter array works

Thanks to the special polarization filter array applied on the sensor, each superpixel can acquire 4 different polarization angles simultaneously. Based on the information acquired from these four channels, a special interpolation algorithm is able to provide data for all the in-between angles, as if a rotating polarizer were in front of a monochrome camera.
This measure is the key to deriving complex parameters such as the Degree of Linear Polarization (DoLP), an estimate of the polarization coherency of the light, and the Angle of Linear Polarization (AoLP), an estimate of the polarization angle.
Since monochrome video format is not suitable to visualize AoLP and DoLP informations, we developed an advanced deature for our cameras: the FusionView feature. FusionView is an unique feature available only on CELERA P: it maps AoLP on the Hue component of the HSV color space and DoLP on the Saturation component, giving an intuitive preview of these properties of light.CELERA P Polarization array

CELERA P FusionViewFusionView feature example

 

CELERA Polarized features

  • AoLP: Angle of Light Polarization
  • DoLP: Degree of Light Polarization
  • Stokes parameters
  • Virtual polarization angle (derived through dedicated algorithm)
  • Parallel video streams from the same RAW image
  • 4 polarization angles detected for each superpixel
  • Reflections reduction algorithm

 

Accessories

CELERA P is provided by standard with a C-mount lens adapter.
Other accessories are available upon request.

 

Features

firewirePolarization image sensor

SONY Pregius IMX250MZR is a 5 megapixels global shutter sensor with unique polarization imaging capabilities. It features an unique array of polarizer filters overlaid on top of the pixel array and beneath the micro-lenses: thanks to this technology, camera sensor directly acquires the data on light polarization without any additional filter.

FPGAFPGA architecture

Thanks to a powerful FPGA architecture, CELERA P is capable of reaching up to 152 fps while processing more than 200 million vectors per second, without overloading the computer.

fusionviewFusionView feature

FusionView is an unique feature available only on CELERA P: it maps AoLP on the Hue component of the HSV color space and DoLP on the Saturation component, giving an intuitive preview of these properties of light.

tinyTiny rugged design

Small, ultra-lightweight, rugged aluminum machined high precision case allows maximum installation flexibility even in space constrained environments.

ioVersatile I/O

With 2 inputs, 2 outputs and 1 I/O, CELERA series offers unprecedented flexibility for interfacing to outer world signals: direct encoder readout and strobed lightening have never been so easy.

triggerAdvanced triggering

With CELERA series, user can choose among a long list of triggering mechanisms. Acquisition can be driven by high/low logic levels, edges and encoder position. Furthermore, the frequency of triggering signals can be internally converted to solve even the most challenging problems.

 

Technical specifications

Model C5S-MP
Resolution 2464 x 2056
Sensor SONY Pregius® IMX 250 MZR
Format 2/3 "
Pixel size 3.45 x 3.45 µm2
Color / Mono Mono Polarized
Max Frame Rate 152 fps
Pixel Format MONO8/16, RAW8/16, RGB24
A/D Conversion 8, 10, 12 bit
Synchronization External trigger, software trigger
Shutter Control 17 µs ÷ 5 s (global shutter)
Readout Normal, frame combiner
Power Supply < 3 W, powered by USB3 interface
Inputs / Outputs 2 in (direct encoder interface), 2 out, 1 I/O (RS422, RS644 LVDS, LVTTL)
Lens Adapter C-mount, F-mount (optional)
Interface 2 x USB 3.2 Gen 1x1
Weight < 150 g (with C-mount adapter)
Size 56 mm x 56 mm x 38.5 mm (with C-mount adapter)3
Conformity CE, RoHS, FCC, IC
Controls Shutter, gain, LUT, FusionView
Operative Temp 0 ÷ 50 °C
IMX250 IMX252 IMX264 BW

MECANICAL SPECIFICATIONS

dimensioni celera_one

Sensor specifications (b/w and color) are extracted from the data sheet of the manufacturer excluding lens and filter. All dimensions are expressed in millimeters.
Camera specifications are subject to change without notice.