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Opto to present Calibration Targets at SPIE Photonics West - essential tools for optimizing any Optical System

Opto GmbH

Opto GmbH exhibits once more at World's largest trade fair for photonics technologies

BIOS:  27 – 28 January 2018  Booth 8653

Photonics West: 30 January - 01 February 2018  
German Pavilion, Booth: 4629-68
The Moscone Center San Francisco, California, United States

Among interesting new other products Opto presents its Calibration, Resolution, and Particle Targets - essential tools for optimizing any Optical System.

Optical calibration and resolution testing are critical metrics in understanding and optimizing any optical system. 

Calibration Target Micro V1

Optical calibration and resolution testing are critical metrics in understanding and optimizing any optical system. 

Calibration Target Micro V1 is unique in that it combines very useful resolution data, combined with ultra-high definition micro features, together enabling efficient and accurate optimization of any optical setup. 

  • Ultra-high definition micro features, compatible to the most demanding optical calibration requirements 
  • Four unique quadrants combining resolution targets to measurement scales 
  • Supplied in a dedicated padded storage case 

Calibration Target Micro V1Test Target

Test Targets allows the calibration of measurement functions in microscopes through objects in different forms and sizes or of resolution of an optical system measured in Line Pairs per mm.

The Target allows the calibration of measurement functions in microscopes, to analyze and measure particles. A field of objects in different forms and sizes allows the user to check: rectangles, ellipsis, circles, rings and even fibre-shaped objects. To determine optical distortions there are three different sized arrays of cross-targets. The smallest Object is as small as 5μm.

For the calibration of the resolution (magnification) two scale bars in X and Y are applied in a corner of the target.

Opto's Particle Test Target contains defined particles in different shapes and sizes for easy system calibration of

  1. Scale and angular alignment
  2. Size classes according to VDA
  3. Distortion fields
  4. Distortion field
  5. Area of particles (simulating residual dirt filter sample)

Optional with DVD Certificate

  • Calibration objects
  • Calibration method
  • Measuring condition
  • Environmental conditions
  • Measurement uncertainty
  • Measurement results

Resolution Test Target

Resolution Test Target

Test targets (also called test charts, test samples or resolution test patterns) are used to determine the efficiency of optical systems. They are used to determine resolution, MTF, depth of field, distortion and telecentricity.

It is necessary to test and calibrate every single system for comparative measurements, especially when dealing with several measuring systems of the same type.


Stage Micrometer

The stage micrometer is a helpfull tool for calibration purposes.

Stage micrometer 50 mm 0.1 / 0.01 mm

- 50 mm glass scale in 0.1 mm and 0.01 mm

- The calibration of surveying software

Stage MicrometerImage Quality Features

The resolution of an optical system indicates the discernibility of two minute structures that can still be perceived separately. The resolution of optical instruments is limited by diffraction. The typical specification is made in line pairs per mm (Lp/mm). The dependence of the resolution from the contrast describes the modulation transfer function.

Modulation Transfer Function (MTF)
MTF (also called contrast transfer function) describes the comparison of the contrast of the edges of a (real) object with the contrast of its image at a certain resolution (MTF = image contrast/object contrast). There will always be some contrast loss.

The contrast describes the relationship between light and dark areas of an image, indicated in per cent (%).

Depth of Field
The depth of field (DOF), often erroneously dubbed “field of depth”) describes the expanse of the focussed area (within the object space) in front of and behind the optimal focus level. The smaller the aperture (i.e. the larger the f-number) the greater the depth of field area.

The hyperfocal distance is a special instance in which the depth of field area extends to infinity.

In case of telecentric lenses, the telecentric area is essentially the depth of field area.

The distortion (or visual distortion) is a geometric image defect (aberration) of lens systems. It leads to different magnifications when the distance to the optical path of the system increases and creates the image of straight lines that do not cross the centre of the image to be reproduced in a bent way.

Decreasing magnifications (reductions) with respect to the image field edge are called barrel-shaped distortions (fish-eye effect) with an increasing pulvinate distortion. The distortion is generally indicated in per cent (%).

About Opto
For over 30 years, Opto GmbH has been a manufacturer of high reliability, embedded vision and inspection solutions to some of the most challenging machine-integrated imaging applications. Opto provides high-performance imaging solutions ranging from simple vision components all the way to complex imaging modules and subsystems. Most recently, Opto has developed a range of highly compact embedded imaging modules specifically for OEMs involved in building industrial and biomedical machines. With onboard cameras, lens, light, and intelligence, Opto’s new fully integrated imaging modules enable OEMs to instantly achieve the very highest image performance and resolution, without the need for specialist optical expertise.




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