Sensing device for ascertaining imaging errors

• US 4,666,298 A
• Filed: 04/10/1985
• Issued: 05/19/1987
• Est. Priority Date: 04/10/1984
• Status: Expired due to Fees

• Current Assignee: Messerschmitt-Boelkow-Blohm GmbH (Mercedes-Benz Group AG)
• Original Assignee: Messerschmitt-Boelkow-Blohm GmbH (Mercedes-Benz Group AG)
• Inventors: Protz, Rudolf
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Lee, James C.
• Application Number:
  US06/722,128
• Time in Patent Office: 769 Days
• Field of Search: 250/201 R, 356/121, 356/354
• US Class Current: 356/121
• CPC Class Codes: G01J 9/00 Measuring optical phase difference devices or arrangements for controlling the phase of light beams G02F1/01; Determining degree of coherence; Measuring optical wavelength spectrometry G01J3/00

Abstract

A sensing device for use in an adaptive optic system, being provided with an optical phase correcting element, is specifically provided for ascertaining errors in the image of an object as imaged by the adaptive optical system as follows; rod lenses subdivide the entrance pupil of the aperture into a plurality of juxtaposed subapertures having a diameter corresponding to Fried'"'"'s coherence diameter to obtain a respective plurality of individual images of the object; a high resolution optical-electrical detector array is positioned to receive the plurality of juxtaposed individual images; the relative disposition of the subimages is ascertained under utilization of a correlation computer.

Claims

1. Sensing device for use in association with an adaptive optical system having an entrance pupil and being provided with an optical phase correcting element, the sensing device being provided for ascertaining errors in the image of an object as imaged by said adaptive optical system, the combination comprising:

means for subdividing the entrance pupil of the aperture into a plurality of juxtaposed subapertures so as to obtain a respective plurality of individual subimages of the object respectively corresponding to the subapertures;

a high resolution optical-electrical detector array positioned with respect to said means for dividing, so as to receive a plurality of juxtaposed individual subimages; and

means connected to the detector array for ascertaining the relative disposition of the subimages under utilization of a correlation computer.

2. Sensing device as in claim 1 wherein the effective diameter of a subaperture corresponds to the Fried coherence diameter in the atmosphere.

3. Sensor as in claim 1 wherein said means for providing the subapertures is established by a plurality of juxtaposed rod lenses.

4. Sensing device as in claim 1 and including a semitransparent mirror inserted optically upstream from said means for providing subapertures;

and

means for introducing into the light ray path for the detector array and through said semitransparent mirror an illuminated measuring raster.