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3D-Shape GmbH
Henkestraße 91
D-91052 Erlangen
Germany

Phone: +49-9131-977 959-0
Fax: +49-9131-977 959-11
E-mail: info@3d-shape.com
  
 
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Produkte > SpecGAGE3D
Introduction Measurement Principle
Sensor Specification Measurement Examples
Distributor

 
A new method to measure specular free-form surfaces

Using our new area type 3D sensor SpecGAGE3D, specular surfaces like those of eyeglass lenses, car bodies, plastic films, solar cells, hard disks, etc. can be measured quickly and very accurately in a cost efficient manner. This product provides a tool for development and quality assurance departments to improve the production process in order to avoid manufacturing errors and, consequently, to minimize costs.

 
Further information can be found in the product sheet, available in PDF format.


 
Measurement Principle

The new sensor is based on the principle of phase measuring deflectometry. To calculate the local slope of a surface a fringe pattern with a sinusoidal profile is projected onto a ground glass. A video camera observes the reflections of this pattern via the surface under test. The local slope of the surface can directly be calculated from the distortions of the observed fringe pattern. The local surface curvature is simply the first derivative of the local slope.
 
PMD: measuring principle  

This technique provides crucial advantages when compared with range measuring methods since for curvature computation the data have to be differentiated only once. Thus, high frequency noise is much less amplified than in the case of range data, which have to be differentiated twice.

 
Sensor Specifications

Measurement Principle
- Phase Measuring Stereo Deflectometry
 
Field of view
- 80 x 80 mm2
 
Measuring range
- ±18°
 
Measurement uncertainty
- ±0.02 dpt
 
Calibration
- The device is factory calibrated and can be re-calibrated by a technician
  on request.
 
Included in package
- SpacGAGE3D
- PC
- Control and evaluation software for Microsoft Windows® NT/2000/XP
 
Dimensions h x w x d
- 1850 x 850 x 750 mm3


 
Measurement Examples

Example for measuring a progressive eyeglass lens. The local mean surface power (mean curvature) is represented on the left side, the local astigmatism is displayed on the right.
 
Example: progressive eyeglass lens  
 

 
Distributor

Exclusive distribution for ophthalmics by Schneider GmbH & Co KG.
print version

Measuring the surface of a lens with SpecGAGE3D
 Measuring the surface of a lens with SpecGAGE3D