Single element radiometric lens

摘要

The disclosure describes systems and apparatuses that include a focusable lens, as well as methods for focusing the optical lens. The focusable lens system includes a single element lens having a concave refractive surface characterized by a first radius of curvature and a convex refractive surface characterized by a second radius of curvature larger than the first radius of curvature. A detector element generates electrical signals representative of infrared rays refracted by the single element lens and incident on the detector element, and an aperture stop is disposed around an optical axis of the optical system and secured in a constant position relative to the detector element, the aperture stop configured to limit a cone angle of rays refracted by the single element lens. They system also includes image processing circuitry configured to generate digital pixilation data based on electrical signals generated by the detector element.

主权项

1. A focusable optical system comprising:
a single element lens having a concave refractive surface characterized by a first radius of curvature and a convex refractive surface characterized by a second radius of curvature; a detector element configured to generate electrical signals representative of infrared rays refracted by the single element lens and incident on the detector element, wherein the single element lens is characterized by:
a far scene focus position a first distance from the detector element; anda near scene focus position a second distance from the detector element, the second distance being greater than the first distance; an aperture stop disposed around an optical axis of the optical system and secured in a constant position relative to the detector element, the aperture stop being configured to limit a cone angle of rays refracted by the single element lens; and image processing circuitry configured to generate digital pixilation data based on electrical signals generated by the detector element.