Title:
光波目標検出装置及び偏光制御方法
Document Type and Number:
Japanese Patent JP7433839
Kind Code:
B2
Abstract:
To form by a simple construction the black background for correcting the sensitivity of an infrared detector without using a drive mechanism.SOLUTION: According to a polarization controller pertaining to an embodiment, a polarization controller for limiting the polarization plane of incident light is arranged on the optical axis of an infrared detector that detects an infrared-ray target image, first and second polar screens are arranged on the optical axis so that the polarization planes intersect each other at right angles, and a Faraday rotator for shutting incident light off as the polarization plane rotates due to Faraday effects in accordance with the strength of magnetic force is arranged between the first and second polar screens. When correcting the sensitivity of the infrared detector, the strength of magnetic force acting upon the Faraday rotator is controlled by the controller and incident light from the first polar screen is shut off, whereby the black background of the infrared detector is formed.SELECTED DRAWING: Figure 2
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Inventors:
Kazuhide Sasaki
Application Number:
JP2019198436A
Publication Date:
February 20, 2024
Filing Date:
October 31, 2019
Export Citation:
Assignee:
Toshiba Corporation
Toshiba Infrastructure Systems & Solutions Corporation
Toshiba Infrastructure Systems & Solutions Corporation
International Classes:
G02F1/09; G03B11/00; G03B17/02; H04N23/55
Domestic Patent References:
| JP4097216A | ||||
| JP2008278036A | ||||
| JP2016100612A | ||||
| JP59012378A | ||||
| JP56161520A | ||||
| JP9236784A | ||||
| JP2018091630A | ||||
| JP2001083248A | ||||
| JP200567285A |
Foreign References:
| US20160044306 |
Attorney, Agent or Firm:
Suzue International Patent Office