Chicago, IL — FOGALE will present its LENSCAN system for non-contact thickness and positioning measurement at Photonics West 2009 in San Jose, Calif., from Jan. 27 to 29, on the French Pavilion at booth 1613.
The LENSCAN system is a non-contact thickness and positioning measurement in optical assemblies. It allows for direct measurement of the position and the center thickness of all optical elements and air gaps of an assembly along the optical axis. It works for all kinds of elements such as lenses, optical cubes and flats, and also measures distances between them (air gaps). Whether in production, quality control, or R&D mode, it can be used with large benefits in term of time saving and quality assessment at all steps of the optical design and manufacturing process.
Based on the principle of a low-coherence infrared interferometer technique, the system operates as a comparator of optical group delays. It can be used to measure positions and thicknesses of transparent materials at the near infrared wavelength.
While the standard LENSCAN system achieves an absolute accuracy of ‚Â±1 ‚Âµm for position and distance measurements, the new generation, LENSCAN +600, reaches an accuracy level of ‚Â±200 nm for distance measurements while maintaining the ‚Â±1 ‚Âµm for position measurements. The system, including its software, has been specifically optimized as a metrology tool dedicated to the optical industry. The focus position of the collimator is adjustable to the position of the sample. The signal treatment performs specific analysis in order to eliminate many parasitic contributions due to multiple reflections. The software allows the measurement of air gaps and lenses thicknesses inside an objective to check if the system meets the tolerance specification. The large measurement range (up to 600 mm), the long working distance (up to several meters), and the possibility to use a long measurement fiber (several tens of meters) between the system and the collimator give perfect solution for a wide range of applications.
Filed Under: Test + measurement • test equipment, Vision • machine vision • cameras + lenses • frame grabbers • optical filters