59results about How to "Broadband" patented technology

The invention discloses a differential linear piezoelectric motor and a working method thereof. A driving foot on a motor stator comprises two groups of symmetric piezoelectric stacking layers parallel with a guide rail, and one group of piezoelectric stacking layers vertical to the guide rail, so as to respectively provide slight vibration in parallel with and vertical to the guide rail direction for the stator driving foot. The differential linear piezoelectric motor has the advantages that by utilizing symmetric periodic signals to excite piezoelectric stacking layer parallel with the guide rail direction, and rectangular wave signals to excite the piezoelectric stacking layer vertical to the guide rail direction, the friction driving characteristic between the motor stator and a rotor has obvious difference between the driving phase and the return phase, so that the movement distance of the motor in the driving phase is greater than the movement distance in the return phase; because the motor has obvious different differential friction characteristic in the frequency range of 0 to 1KHz, when the driving frequency is changed from low frequency to high frequency, the positioning accuracy of the motor is gradually changed from nanometer level to micrometer level, and the macro-micro combined positioning platform with complicated structure may be replaced.

The invention provides a Fourier overlapping correlation imaging system and method based on computational ghost imaging. The system comprises a spatial filter, a spatial light modulator, an imaging module, a high speed light sensitive array, a processing module which is used for calculating the image of the corresponding position of each single pixel detector and using the image as the low-resolution image of tilted plane wave illumination whose light source is the single pixel detector, and a calculation module. The calculation module is used for carrying out Fourier transforming on the low-resolution image to acquire the move and low-pass filter of a spectrum corresponding to a target high-resolution image at the incident angle and the numerical aperture of the objective lens, splicing the overlapped relevant parts of the spectrum of the low-resolution image to acquire the spectrum of the target high-resolution image, and using a phase recovery algorithm to acquire the target high-resolution image. According to the invention, the image acquisition efficiency of the whole imaging system can be improved; measurement of a wider spectrum than an ordinary array sensor is realized; compression reconstruction of an image is realized; and the rate of single imaging is improved.

The invention discloses a multichannel fiber bragg grating chromatic dispersion compensator. Gratings carved on fibers serving as base materials are interleaved amplitude sampling gratings, and the interleaved amplitude sampling gratings comprise multiple grating periods with different central wavelengths in a sampling period; and the gratings with different central wavelengths are written, and when the chirp of the grating periods with different central wavelengths synchronizes, the obtained chirp of spectra is the sum of the chirp of each central wavelength. By utilizing the method, the energy utilization ratio of the gratings can be improved effectively, and a reflecting channel with high energy efficiency is obtained; and the interleaved amplitude sampling gratings have the effect of chromatic dispersion superposition, so that the small chirp of each grating with different central wavelengths occurs so as to obtain large chromatic dispersion and avoid the superimposing phenomenon of the adjacent spectra caused by overlarge chirp coefficients. The invention provides the chromatic dispersion compensator with narrow band, wide broadband and high energy efficiency, and provides a new concept for the design of different grating chromatic dispersion compensators.