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Lens Measurement Instrument

Photonics.com
Feb 2010
Optikos CorporationRequest Info
 
WAKEFIELD, Mass., Feb. 10, 2010 – Optikos Corp. has introduced the LensCheck lens measurement instrument, a system for both production and prototype lens qualification. It features high-resolution motorized stages, 12-bit real-time video output and integrated glass scale encoders providing accurate, efficient measurements in a compact, portable system.

Coupled with proprietary and patented VideoMTF image analysis software, the quality control system enables real-time modulation transfer function (MTF) testing, measurement and analysis. This enables manufacturers to qualify incoming products quickly and reliably while minimizing the risks of producing substandard complete assemblies. A finite conjugate model is also available.

The compact and portable system features high-resolution USB motorized stages, a 50-mm clear-aperture refractive collimator, an integrated eight-position manual target and filter wheels, and a self-centering lens holder. In addition to measuring on/off-axis modulation transfer function, it also measures effective focal length (EFL) and f number, back focal length, astigmatism, field curvature, distortion, transmission and relative illumination.

MTF accuracy is ±2%, and MTF repeatability is ±1%. The visible image analyzer is a FireWire camera with spectral sensitivity from 400 to 1000 nm. The motorized Z-axis has 25-mm travel with 0.1-µm resolution, the motorized X-axis has 25-mm travel, and the manual Y-axis has 12.5-mm travel.

Options that enable users to customize the system for their lens measurement needs include a diffraction-limited visible lens to verify MTF and EFL measurements; achromatic and apochromatic objectives; pinholes, slits and other custom targets; a night vision lens testing filter, a bandpass filter set for axial and lateral color measurement, and a photopic filter; an integrating sphere module to measure transmission, relative illumination and stray light; an off-axis parabolic mirror suitable for broadband lens measurements from the visible to the long-wave infrared; and a variety of lens mounts.


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GLOSSARY
astigmatism
A lens aberration that results in the tangential and sagittal image planes being separated axially.  
bandpass filter
A filter with a transmission that is high for a particular band of frequencies, but that falls to low values above and below this band.
distortion
A general term referring to the situation in which an image is not a true-to-scale reproduction of an object. The term also is used to connote the temporal alteration of the signal's waveform shape. There are many types of distortion. See also anamorphic distortion; curvilinear distortion; keystone distortion; panoramic distortion; perspective distortion; radial distortion; stereoscopic distortion; tangential distortion; wide-angle distortion.
integrating sphere
A hollow sphere coated internally with a white diffusing material and provided with openings for incident beam, specimen and detector used for measuring the diffuse reflectance or transmittance of objects.  
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