Optical synthesis aperture image-forming system based on optical fiber array

Abstract

The present invention provides a novel optical synthesis aperture imaging system based on the optical fiber array. The high-resolution image can be obtained by the imaging technique of synthesizing a plurality of small apertures to a synthesis aperture. The acquired accomplishment of optical synthesis aperture imaging in the high resolution imaging displays that the technique has a wide developing prospect. The invention receives the optical wave radiated from the target by a Cassegrain telescope array. The optical fiber is coupled in a single-mode polarization-preserving fiber for transmitting. An optical fiber collimator array is used for leading to coherent imaging of the light beam. The phase error compensation is executed through a piezoelectric ceramic phase modulator and an optical fiber delay line. The whole set of equipment goes for miniaturization and lightening, and can be applied in the fields of astronomical measurement, remote sensing the plant cover, monitoring the environment and disaster and the like.

Description

technical field [0001] The present invention mainly relates to an optical synthetic aperture imaging system based on an optical fiber array, especially using an optical fiber to transmit light waves with target information, correcting the initial optical path difference through an optical fiber delay line, using a sinusoidal amplitude transmission grating for phase error extraction, piezoelectric ceramics The phase modulator compensates atmospheric fluctuations and instrument dynamic phase errors, and is a new type of optical synthetic aperture imaging system based on fiber arrays. Background technique [0002] According to the Rayleigh criterion, the expression of the angular resolution is obtained: θ=1.22λ / D rad, λ is the center wavelength of the imaging system, and D is the diameter of the aperture. Within a certain wavelength range, the larger D is, the higher the resolution of the imaging system is, and its price, weight and manufacturing difficulty also increase sharpl...

AI Technical Summary

Problems solved by technology

[0004] Optical synthetic aperture technology is a high-tech field to achieve high-resolution observation. The technical difficulties include the following aspects: (1) Multiple aperture beams combine coherent systems with complex

The optical synthetic aperture beam combiner is used to synthesize and interfere multiple beams of light. As the aperture increases, the complexity of the system increases and the cost increases

(2) High accuracy requirements for optical path compensation

The optical path difference of each optical path must be precisely controlled. If the optical path error is large during transmission, the rear-end imaging will be distorted

(3) It is difficult to control the polarization state of the optical path

When the beam is combined, it is easy to change the polarization state of the incident beam through multiple optical devices, causing the back-end interference image to be unstable

(4) Susceptible to vibration

Vibration can cause positional displacement of the synthetic aperture optics and cause optical path errors

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