Miniaturized laser readout head for application in a double-wedge prism scanner

Area of Science:

• Optical Engineering
• Imaging Systems
• Metrology

Background:

• Double-wedge prism scanners are standard for one-dimensional (1D) scanning in imaging.
• These scanners utilize counter-rotating wedge prisms for image translation.
• A key limitation is the nonlinear relationship between prism rotation and image deviation angles.

Purpose of the Study:

• To address the nonlinear distortion inherent in double-wedge prism scanners.
• To introduce a novel correction mechanism using a laser readout head (LRH).
• To present a miniaturized LRH, driver circuit, and amplifier for enhanced scanning accuracy.

Main Methods:

• A metal ring with unequally spaced line markers was employed.
• Each marker corresponds to specific angular orientations of the wedge prisms.
• A laser readout head (LRH) detects these markers, converting signals into electric clock pulses for correction.

Main Results:

• The LRH successfully detects line markers to generate correction signals.
• The system effectively compensates for the nonlinear distortion of the scanner.
• Miniaturization of the LRH and associated electronics was achieved.

Conclusions:

• The proposed LRH system provides an effective solution for correcting nonlinear distortions in double-wedge prism scanners.
• This technology enhances the accuracy and reliability of 1D scanning in imaging applications.
• The miniaturized design facilitates integration into various optical systems.