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| Optical phase filter using liquid crystal |
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| Twisted nematic liquid crystal display device |
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| Complex spatial modulator |
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Radiometer with correction device
| Details |
Inventors: Ogikubo, Kazuhiro;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Nelms; David C.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
A radiometer mounted on an aircraft, satellite or similar flying body for observing reflections or radiations of visible rays or infrared rays from the land or the sea. The radiometer has optical means for receiving and converging the visible rays or infrared rays, light-sensitive elements to which the converged rays are incident, means for changing the optical distance between the light-sensitive elements and the optical means, and means for generating correction data while the focal distance of the optical means is deviated from the light-sensitive surface of the light-sensitive elements. |
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DETAILED DESCRIPTION In accordance with the present invention, a radiometer mounted on a flying body for observing radiations or reflections of visible rays or infrared rays from the land or the sea comprises optical means for receiving and converging the visible rays or the infrared rays, light-sensitive means to which the converged light is incident, means for changing the optical distance between the light-sensitive means and the optical means, and means for generating reference input level data for correction while the focal point of the optical means is deviated from the light-sensitive surface of the light-sensitive means.
Preferably, the means for changing the optical distance comprises an actuator in the form of a wedge-shaped glass or a piezoelectric element disposed on the optical path.
The actuator is connected to the light-sensitive means to move it in the direction of the optical axis of the optical means.
To generate the reference input level data, the light-sensitive means is moved in the direction of the optical path of the optical means or the optical distance from the optical means to the light-sensitive means is changed.
In this condition, i.
e.
, while the focal point of the optical means is deviated from the light-sensitive surface of the light-sensitive means, any desired range on the land is observed.
At the same time, the luminance of the range of interest is measured to compensate for the diffusion and absorption ascribable to the atmosphere, whereby the radiometer is corrected.
By shifting the focal point, it is possible to conduct uniform light to the radiometer even when the subject of observation has a luminance distribution.
Hence, uniform reference light is achievable over a broad visible range.
The present invention is, therefore, capable of detecting changes in the reflection characteristic of a plane mirror and the transmission characteristic of lenses included in the optics, the scattering among the sensitivities of all the light-sensitive elements, and fluctuations in the characteristic of an electric system at any desired frequency
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