Numetrix

Our Technology

NX3D™ digitizer information

Based on MVE (Multispectral Volumetric Encoding) full-frame 3D snapshot technology, NX3D™ digitizers provide the fastest and most accurate 3D data on the market for real-time industrial inspection.

  • Optimum accuracy in all situations, even if the object is moving or vibrating
  • Best precision / speed ratio on the market
  • Delivered pre-calibrated and ready to use for maximum productivity
  • Easily integrated in typical industrial environments
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MVE, a revolutionary technology, acquires full-frame 3D snapshot in 50 μs.

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Recognized solutions for various industry challenges

  • Best precision / speed ratio on the market
  • Dedicated software suite for automated inspection
  • Custom detection algorithms for defect classification
  • Easily integrated in typical industrial environments

MVE is based on ultrafast projection of space and time modulated multispectral light.

The imaging subsystem can acquire a sequence of multispectral images in 50 μs.

The very short acquisition time allows obtaining sharp 3D data over moving or vibrating objects.

MVE has higher spatial resolution than stereoscopic approaches. No surface features are needed to obtain accurate 3D data at each pixel.

Numetrix Studio™ software interface

Our dedicated user interface – Numetrix Studio – allows full customization and editing of user related machine vision algorithms.

We work closely with our clients to develop custom solutions that fully meet their surface inspection goals.

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NX3D-15NX3D-50
Field of view15 x 11 mm50 x 39 mm
Depth of field3 mm15 mm
Pixel size12.5 µm42 µm
Depth resolution5 µm9 µm
Working distance75 mm315 mm
Maximum object speed0.8 m/s2.8 m/s
Exposure time50 µs50 µs
Frame rate12 fps12 fps
Size (L x W x H)525 x 433 x 95 mm548 x 581 x 179 mm
Data interfaceGigE VisionGigE Vision
Control interface- 4 digital input - 4 digital output - RS-422/RS-485- 4 digital input - 4 digital output - RS-422/RS-485
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How it works

Numetrix uses a structured “white” light technology to calculate the tridimensional shape of the object. This method projects a number of striped patterns across the object to be imaged. Phase shifted patterns reflected by the object are then grabbed by an imaging device. In a structured light imaging system, the depth resolution and the scanning range are directly proportional to the number of stripe patterns that are projected onto the object. Usual structured light digitizers require exposure times of a few hundreds of milliseconds to several minutes in order to grab numerous patterns for a single 3D image. Unlike the usual systems, Numetrix Digitizers grab a high number of patterns within 50 microseconds (1/20,000 of a second). To do so our digitizers shine a 50 microseconds burst of multiple ultrashort flashes (about 10 us per flash). Each flash is split in different colors, projecting a stripe patterns of each color in every single flash. The striped patterns are grabbed individually in a proprietary high speed multispectral imaging device.

The short duration of flashes makes it possible to achieve a lateral resolution of 40 microns and a depth resolution of 6 microns on objects moving as fast as 2,8 m/s (550 ft/min). The 3D image acquisition can be performed at 12 frames per second. Each frame is a high resolution 3D snapshot of a full-field surface area.

Numetrix DigitizerLaser
AccuracyHigh lateral resolution along two axesHigh in one axe, but overall precision is greatly dependent on movement stability generated by the mechanics on the other axe
VibrationUnaffectedHighly affected, critical
TextureAccuracy in three axes simultaneouslyLaser strength is to represent forms in one X-Z plan. “Speckle” effect poses limitations on resolution and accuracy. Laser scanner is also prone to artifacts at sharp reflectance changes
Speed of moving objectsUp to 2.8 m/s and allowing vibrationsCan handle movements, but resolution greatly affected by vibrations
Integration to production environmentAs simple as fitting a simple camera on a conveyor beltDifficult, industrial environments often generate conditions that are not compatible with laser technology
Eye safe technologyYesClass 3 lasers require a regulated environment and training

How can we solve your challenges?

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Works on black

Unlike laser lines profilers, Numetrix digitizers are not limited by speckle effect. Speckles happen when the projection of a spatially coherent light beams onto the optically rough surface, which introduces a shape variation of the spot image and causes errors in point triangulation. Numetrix digitizers use 100% incoherent light source, projecting broadband images and therefore avoiding speckle effects.

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Unaffected by vibration

Numetrix gathers all the information to calculate the 3D surface with a series of very short flashes. Since the flash duration is 1/100,000 of a second the part under inspection can move or vibrate, as long as it hasn’t moved too much in comparison to the desired resolution.

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Better accuracy

Limitations of a 3D scanner are typically derived from its positioning method. Object motion relative to the scanner must be a lot more precise than what you want to measure. Every positioning error, vibration or yaw will lead to noise between each laser profile. Even though software algorithms can reduce this noise, it can’t be totally eliminated in real production environments.

Automatic inspection algorithms need the amplitude of the defects to detect to be quite larger than the noise of the measured data. Numetrix surface digitizers allow taking an instant snapshot of a full area of your object, avoiding all the possible errors linked to movement or vibrations. Acquisition time is so fast your parts could even move your actual conveyor!

The technology section provides an understanding of how instant snapshots work. If the object is larger than the field of view of the digitizer, it is possible to perform the inspection on individual images before or after digitally stitching the slightly overlapped images.

Laser scanner is prone to artifacts at sharp reflectance changes as they measure the centroid of the laser spot. The centroid can be shifted by any reflectance change. Numetrix digitizers build the 3D surface using only the light reflected by each location without considering the neighboring pixels. Its results are not affected by sharp changes or shape discontinuities.

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Safer than laser

Numetrix Digitizer is safer for users, especially compared to laser technology using Class 3 devices. These are highly regulated, potentially dangerous to human eyes, and require environment conditions to be adapted to reduce the risk of injuries.