Measures

• MTF (Modulation transfer Function)
• Focal length
• Distortion
• Back and Flange Focal Length
• Chief Ray Angle
• Field tilt
• Field Curvature
• Relative Illumination
• Line of Sight
• Transmission
• Encircled Energy
• Axial Color
• Lateral Color

VideoMTF®

The VideoMTF ® Image Analysis Module is used in conjunction with a two-dimensional imager to provide real-time measurement of MTF. The VideoMTF ® module can be configured for use with most industry standard video format cameras to provide high-speed laboratory quality measurement capabilities. While typically used in the visible wavelength range, we offer image analyzers for the near-infrared, mid-wave infrared, and longwave infrared. An Image Analysis-based testing system is recommended for visible applications or for high-speed production testing at any wavelength. The Image Analysis Module comes equipped with the appropriate framegrabber.

VideoMTF® Provides Real-Time MTF Testing

Classical MTF testing is performed by scanning a physical edge across an image produced by an optical system edge or slit. The resultant “knife-edge scan” is a graph of the amount of light passing the edge as a function of its position. The derivative of the knife-edge function is the Line Spread Function (LSF), a one-dimensional profile of the image. The MTF of the system is the magnitude of the Fourier transform of the LSF. The VideoMTF® module uses an innovative acquisition technology to capture the entire image instantly. The area of interest, the image, is fixed within two rectangular “crosshairs” on the screen. The location of the crosshairs can be adjusted manually by the operator or automatically by the VideoMTF® module. The image area defined by the crosshairs is mapped into the computer memory through a framegrabber board. Two orthogonal LSFs are derived from the “grabbed” images and the MTF is calculated and graphically displayed. It all happens in a fraction of a second, and is continuously updated so that the MTF is displayed in real-time.

Features

• • Real-time measurements
  • Framegrabber gain and offset control
  • Background/dark current correction
  • Sloping slit/edge correction
  • Video camera

Allows for accurate MTF measurements of optical systems that form complex image structures, such as fiber optic faceplates.

The EROS™ Scanning Image Analysis Module

The EROS™ Scanning Image Analysis Module is used with OpTest® mechanical scan hardware and a single element detector to perform the most flexible and demanding measurements. Image scanning is used where video image acquisition is impractical or impossible, such as in multiple wavelength range testing or at extremely high resolutions. The scanning EROS™ software can be configured for source scanning, knife-edge scanning, or image analyzer scanning depending on the capabilities of the OpTest® hardware used with the system. The EROS™ scanning module allows complete control of scan length, number of samples, data averaging, and data filtering, making it the most powerful and flexible image analysis tool available.

Features

• Source scanning, knife-edge scanning or image analyzer scanning
• Knife-edge function or line spread function image acquisition
• Complete control over image acquisition parameters
• Data acquisition and filtering tools