Infrared Eye: Microscanning
Abstract
This memorandum describes the research and development work that has been undertaken to develop and build a microscanning camera system. The work was conducted as part of the Infrared Eye project which shows a new concept of an infrared surveillance camera system aimed at improving the effectiveness of search an rescue operations. The system is based on two IR cameras operating simultaneously, one covering a wide field-of-view (WFOV) and the other one having a narrow field-of-view (NFOV) mobile within the WFOV. The WFOV camera is optimized for detection while the NFOV camera is optimized for resolution. The resolution of that camera is improved using a technique based on microscanning. The microscanning technique described in this document and implemented in the project differs from others currently used and is the object of a patent request. It consists In imposing micro-displacements to the imaging lens in front of the focal plane array (FPA) by means of piezo-electric micro-positioners and special flexible supports for the lens in both X and Y axis. This support method allows for a symmetrical mechanical loading for the two axis. The advantages of the developed microscanning technique and device are that it can be synchronized to the adjustable frame rate and integration time of the camera, and any microscanning mode and path can be programmed electronically. In our application, we can select 2x2, 3x3 and 4x4 microscanning steps, as opposed to more conventional techniques using a wheel of prisms with fixed speed and mode. Also, the obtained image displacement is equal to the displacement imposed to the lens, irrelevant of its focal length, hence allowing a change of the lens or telescope which may be used as front optics without having to modify the microscanning system. The implementation of this microscanning technique for the NFOV camera in the IR Eye project significantly improved its resolution and therefore its performance as a component of the system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1998
- Accession Number
- ADA637830
Entities
People
- Jean Fortin
- Paul Chevrette