Optical scanning apparatus with the rotation of array into two directions

• US 5,629,516 A
• Filed: 01/28/1994
• Issued: 05/13/1997
• Est. Priority Date: 02/19/1993
• Status: Expired due to Fees

• Current Assignee: Hollandse Signaalapparaten BV (Thales SA)
• Original Assignee: Hollandse Signaalapparaten BV (Thales SA)
• Inventors: Olbertz, Antonius H. M.
• Primary Examiner(s): ALLEN, STEPHONE B
• Application Number:
  US08/187,487
• Time in Patent Office: 1,201 Days
• Field of Search: 250/208.1, 250/234, 250/235, 250/236, 244/3.16, 356/141.5
• US Class Current: 250/208.1
• CPC Class Codes: H04N 23/20 for generating image signals from infrared radiation only
• CPC Class Codes: H04N 23/698 for achieving an enlarged field of view, e.g. panoramic image capture
• CPC Class Codes: H04N 25/48 Increasing resolution by shifting the sensor relative to the scene
• CPC Class Codes: H04N 5/33 Transforming infrared radiation cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20

Abstract

An optical scanning apparatus having a linear detector array and a lens for focusing an image on the array contained within a camera housing. The housing can be rotated around a first axis so as to scan from side to side. In addition, the linear detector array can be rotated around an axis parallel to the direction of sight of the camera to enhance the signal/noise ratio.

Claims

1. Optical scanning apparatus having first and second modes of operation, said optical scanning apparatus comprising:

a camera housing;

a linear detector array comprising a plurality of detector elements;

at least one lens for focusing a beam of light from a direction of sight Z onto the linear detector array;

first rotation means for rotating the camera housing around an axis N which is not parallel to the direction of sight Z;

wherein, in order to change the angle of aperture of the optical scanning apparatus, the detector array is provided with second rotation means for rotating the detector array from a first position relating to the first mode of operation to a second position relating to the second mode of operation, around an axis which is at least substantially parallel to the direction of sight Z.

2. Optical scanning apparatus as claimed in claim 1, further comprising:

a processor for amplifying and time-division multiplexing electric signals generated by each detector element of the linear detector array;

wherein the processor further comprises per detector element adjustable delay means for compensating relative time delays of electric signals from each element of the linear detector array when the scanning apparatus is in the second mode of operation.

3. Optical scanning apparatus as claimed in claim 2, the array further comprising N elements, wherein the processor is provided with a summing network with N inputs connected to the delay means, which summing network is arranged to produce M output signals, M<

N when the scanning apparatus is in the second mode of operation.