6 results about "Single sweep" patented technology

The application discloses a kind of full polarization FMCW laser radar systems and measuring methods, system includes sweep laser source, first optical coupler, polarization state generation module, optical circulator, optical transceiver and scanning module, polarization state analysis module, second optical coupler, photoelectric balance detector and signal acquisition and processing module;Wherein, sweep laser source, first optical coupler, polarization state generation module, optical circulator and optical transceiver and scanning module are sequentially connected;Polarization state analysis module, second optical coupler, photoelectric balance detector and signal acquisition and processing module are sequentially connected;First optical coupler is also connected with second optical coupler;Optical circulator is also connected with polarization state analysis module.The application realizes a kind of new laser radar system, which can be synchronized, high-speed, complete target distance, speed and complete mueller matrix are obtained by single sweep.

The invention discloses an electro-optical modulation double-sideband FSI distance measurement method based on real-time source tracing of a sweep frequency rate, and mainly solves the problem that the distance measurement precision is reduced due to non-constancy of the sweep frequency rate in the prior art. According to the scheme, the method comprises the following steps: 1) establishing a double-sideband scanning interference ranging system for generating interference signals required for real-time tracing of the frequency sweeping rate; 2) performing electro-optical modulation by using an MZM modulator to generate a double-sideband signal; 3) importing the double-sideband signal into an F-P etalon to generate an F-P signal; 4) constructing a frequency sweep rate resolving algorithm module, carrying out peak value processing on the F-P signal, and obtaining the frequency sweep rate of a single frequency sweep period; and 5) substituting the calculated real-time frequency sweeping rate back to a double-sideband frequency sweeping distance measurement calculation process to obtain a distance measurement result. The method can effectively eliminate the ranging error caused by the change of the frequency sweeping rate during the cycle, improves the anti-interference capability of the system while reducing the cost, and remarkably improves the measurement accuracy and reliability of the system in a complex environment.

To provide an optical spectrum measurement program, optical spectrum measurement method, and optical spectrum analyzer for reducing a difference between respective measurement conditions for a plurality of measured lights.SOLUTION: An optical spectrum measurement program for measuring an optical spectrum of a plurality of measured lights during one sweeping allows a processor to perform: acquiring a measurement result of intensity of the measured light selected one by one from the measured lights; and generating the optical spectrum of each one of the measured lights by associating the measured light selected in performing measurement with the acquired measurement result.SELECTED DRAWING: Figure 5

This invention discloses a high-resolution distributed acoustic-vibration demodulation method based on sweep-frequency optical deep anti-fading. First, continuous linear sweep-frequency probe light is injected into an optical fiber, and the original backscattered Rayleigh signal containing information distributed along the fiber is acquired through coherent beat frequency acquisition. Then, the original backscattered Rayleigh signal undergoes frequency domain demultiplexing and matched-filter pulse compression processing to reconstruct multiple high-resolution time-domain complex envelope signals from a single sweep. Next, the high-resolution time-domain complex envelope signals are input into a deep anti-fading demodulation network, where amplitude-phase joint modeling achieves adaptive suppression of random fading and noise in the time-domain complex envelope signal, outputting a de-fading phase sequence. Finally, the de-fading phase sequence is used for phase difference demodulation, and combined with an optical time-of-flight positioning model, to achieve highly robust demodulation and spatial positioning of vibration events. This method maintains high resolution and robustness even under strong noise, long distance, and deep fading conditions, making it suitable for distributed acoustic-vibration and ultrasonic monitoring scenarios.

A non-transitory computer readable medium stores an optical spectrum measurement program to measure, in a single sweep, optical spectra of multiple light rays to be measured. The optical spectrum measurement program is configured to cause a processor to acquire a measurement result of the intensity of a light ray to be measured that is selected one-by-one from among the multiple light rays to be measured, and generate an optical spectrum of each light ray to be measured by associating the light ray to be measured that has been selected during measurement with the acquired measurement result.

Systems and methods for fast light field rendering from a three-dimensional (3D) representation of a scene. In at least one embodiment, fast light field rendering exploits cached color values of a plurality of color planes corresponding to a reference view and cached transmittance values of a plurality of transmittance planes corresponding to the reference view to composite a light field quilt via a single sweep through a plurality of sampling planes / volume chunks, thereby enhancing computational efficiency during rendering.