The grating spectrometer has high polarization sensitivity due to the existence of grating and other dispersive elements, which will directly affect the quantitative data acquisition accuracy of the instrument. Therefore, it is necessary to establish the polarization factor calculation model and measurement method of the grating spectrometer, and then quantitatively describe the polarization effect of the instrument.. The analysis method of quantitative polarization error is founded in this paper, and the polarization measurement device of incident light at discrete wavelength is proposed, in order to achieve the monitor of quantitative polarization error of hyper-spectral detector at central-wavelength. Finally, the quantitative polarization error is analyzed in radiation calibration, and the in-flight polarization error is predicted based on the polarization of incident light measured by SCIMACHY.
When aligning telescopes is difficult to align precisely if the optical system with large view filed, long focal length and large-aperture. Application of reverse optimization analysis method to guide optical alignment in previous of computer-aided alignment has been proposed, namely, the theoretical and the numerical analysis were given by use software. Simulating of three-mirror off-axis optical system was carried out using reverse optimization method. The sensitivity matrix of the mirror directs the priority of adjustment freedom. Calculating the precision of primary alignment can not only reduce alignment time, but also providing the design proof for optic-mechanical design.
With the rapid development of the optical remote sensor technology, it puts forward higher requirements to the sensor’s index. For space camera with large field of view, long focal distance, the image quality and the focal length of the various parameters of the optical system puts forward higher requirements. Therefore how to meet the control index of the sensors put forward new problems for the alignment. The present reports on focal length mainly around the focal length calculation and accurate measurement, but there is no report about how to accurately control the focal length. This article proposed a method for combinatorial optimization based on the focal length and image quality evaluation, geometrical parameter error of the iterative optimization to obtain the best mirror distance compensation combination, that establish mirror-distance compensation control curve to guide the camera alignment process. The focus control precision is less than 1%, the field of view system surface shape is better than 0.08 λ.
The core of the computer aided alignment is aided alignment software installed. The accuracy of analysis and calculation by the software determines the optical adjustment’s precision directly. This paper analyzes the influence of misalignment variable’s precision through simulating the geometric parameters and the surface precision, then verified by some example. This method can help to improve the accuracy of optical adjustment and short the adjustment cycle.
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