Experimental verification for a focusing mechanism of imaging spectrometer is studied. The mechanism uses stepper motor driven precision harmonic drive. Wave generator is composed of elliptical cam and a flexible bearing. The output end is connected with the ball screw rotary motion into linear motion, which drives the focusing lens linear guide reciprocating motion. In view of the practical application of the mechanism in the imaging spectrometer, the thermal optical experimental imaging spectrometer has been focusing the formula. Data show that the focus formula ensures linear relationship between the focal plane position and temperature. The linear relationship shows that the imaging spectrometer onboard the variation with temperature and automatic focusing is very important.
This applies to the design of a telescope system imaging spectrometer, imaging spectrometer for the characteristics of the telescope from the pre-and post-spectrometer components. Pre-telescope system parameters and imaging quality of the application of the imaging spectrometer is very important. This paper designed a spectral range of 1000nm ~ 2500nm, field of view of 28.1 ° × 0.3 °, a relatively large diameter of 1 / 4, 180mm focal length of the telescope system. Systems in a wide spectral 1000nm ~ 2500nm spectral range by the glass and two matching spectral correction of chromatic aberration, distortion control at 0.2%, to ensure good follow-up spectroscopy with the butt, this design can be used for aviation the large field, high-resolution imaging.
A new technique is demonstrated for measurement of modulation transfer function (MTF) on image sensor arrays.
Fourier analysis of a low frequency bar target pattern is used to extract MTF at odd harmonics of a target pattern frequency
up to and beyond Nyquist. The technique is particularly useful for linear image arrays (either conventional linescan or time-delay-
integration devices) where conventional slanted-edge technique is not always applicable. The technique is well suited
to simple implementation and can provide live presentation of the MTF curve, which helps to ensure optimal alignment
conditions are achieved. Detailed analysis of the technique and demonstration of experimental results are presented.
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