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Quantum polarization-based multidimensional information detection device and method

A multi-dimensional information and detection device technology, applied in the direction of measuring devices, electromagnetic wave re-radiation, radio wave measurement systems, etc., can solve the problems of long-distance weak signal echo sensitivity limit and other problems, to improve detection performance, improve signal-to-noise ratio, The effect of strong anti-interference ability

Inactive Publication Date: 2015-12-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the long-distance weak signal echo encounters the sensitivity limit in the existing target recognition field, and provides a multi-dimensional information detection device and multi-dimensional information detection method based on quantum polarization

Method used

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  • Quantum polarization-based multidimensional information detection device and method

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specific Embodiment approach 1

[0020] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the quantum polarization-based multi-dimensional information detection device described in this embodiment includes a synchronization control module 1, a laser 2, a polarization state encoder 3, a transmitting optical device 4, a receiving optical device 5, and three beam splitters 6 , total reflection mirror 7, analyzer 8, quarter-wave plate 9, half-wave plate 10, first single-photon detector Gm-APD11, second single-photon detector Gm-APD12, third single-photon detector Photon detector Gm-APD13, the fourth single photon detector Gm-APD14 and synchronization signal processor 15;

[0021] The synchronization control module 1 generates a synchronization signal to drive the laser 2, and the laser 2 generates a pulse signal with a high degree of polarization. At the same time, the synchronization control module 1 outputs the synchronization signal to the polarization encoder 3, an...

specific Embodiment approach 2

[0023] Specific implementation mode two: the following combination figure 1 This embodiment will be described. This embodiment will further describe Embodiment 1, and the laser 2 is a highly polarized pulsed laser.

specific Embodiment approach 3

[0024] Specific implementation mode three: the following combination figure 1 Illustrate this embodiment, this embodiment will further explain Embodiment 1, the polarization state encoder 3 adopts pseudo-random non-orthogonal horizontal, vertical, diagonal and anti-angle modulation encoding to the pulse signal, and the horizontal, vertical, diagonal and anti-angles are: 0°, 90°, 45° and -45°, respectively.

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Abstract

A quantum polarization-based multidimensional information detection device and method belongs to the laser radar technology field, and is used for solving the problem in the conventional target identification field that a long-distance weak signal echo encounters a sensitivity limit. The quantum polarization-based multidimensional information detection device and method of the present invention is characterized in that a synchronous control module generates a synchronous signal to drive a laser to generate a pulse signal, at the same time outputs the synchronous signal to a polarization state encoder to carry out the horizontal, vertical, diagonal and antidiagonal pseudorandom pulse sequence modulation; the laser after the modulation is carried out the collimation and beam expanding by an emission optical device to irradiate a target, and an echo signal is radiated to a reception optical device and then is divided into four signals by three optical splitters to pass four single-photon detectors Gm-APD respectively; a synchronous signal processor obtains an echo pulse sequence according to the pulse signals detected by the four single-photon detectors Gm-APD, and obtains the multidimensional information of target distance, intensity and polarization according to the echo pulse sequence and the synchronous signal. The quantum polarization-based multidimensional information detection device and method of the present invention is used for the detection of the laser radar long-distance weak signals.

Description

technical field [0001] The invention relates to a quantum polarization-based multi-dimensional information detection device and a multi-dimensional information detection method, belonging to the technical field of laser radar. Background technique [0002] The detection of long-distance weak signals by lidar has always been a technical problem. The echo signal of a small target of 100 kilometers or even 1,000 kilometers is very weak, and even each echo pulse is less than one photon on average, which is beyond the response of traditional lidar. The emergence of single-photon detection technology has greatly improved the detection sensitivity of lidar, but it can only respond to the presence or absence of signals, but not to the strength of signals. Therefore, there is an urgent need for detection methods for multi-dimensional information of long-distance weak signals. Contents of the invention [0003] The purpose of the present invention is to solve the problem of the sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/02
CPCG01S17/02
Inventor 张子静徐璐赵远张勇靳辰飞苏建忠吕华
Owner HARBIN INST OF TECH
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