| 摘要 |
<p>The Foucault or knife-edge method may be employed for testing an optical surface defined by an imaging device, for example, a mirror surface, to ascertain its characteristics, for example, whether or not it is a source of optical aberrations. To this end, the traditional Foucault knife-edge method typically employs a knife-edge that comprises a metal razor blade. The present invention, in contrast, provides a novel optical element suitable for employment in the Foucault method, and features a knife-edge that comprises a transparent substrate (34), and a coating material (38) that can adhere to at least a portion of the transparent substrate, thereby forming at least one knife-edge pattern (40).</p> |
