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A photonic approach to generate chirped microwave pulses with precisely targeted and tuned parameters including central frequency, pulse repetition frequency, and chirp rate, is proposed. Such chirped pulses at 15 and 20GHz are experimentally demonstrated.
Modulation transfer function (MTF) is the ability of an imaging system to faithfully image a given object. The MTF of an imaging system quantifies the ability of the system to resolve or transfer spatial frequencies [1]. Consider a bar pattern with a cross-section of each bar being a sine wave. Since the image of a sine wave light distribution is always a sine wave, the image is always a sine wave...
Ethylene (C2H4) absorption line intensity at 6172.95 cm-1 was determined for trace gas detection. C2H4 trace concentration measurements were performed using quartz enhanced photoacoustic spectroscopy (QEPAS) with a sensitivity of 1.3 ppmv (1sigma) for tau=1s time constant. The effect of modulation frequency accuracy on QEPAS signal was investigated.
This Paper presents a state space model for the Hubble space telescope under the influence of unknown disturbances in orbit. This model was obtained from flight data by applying the Q-Markov Covariance Equivalent Realization identification algorithm. This state space model guarantees the match of the first Q Markov parameters and covariance parameters of the Hubble system. The flight data were partitioned...
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