CN-120176823-B - Optical fiber underwater acousto-magnetic integrated detection sensor based on diamond nitrogen vacancy color center

CN120176823BCN 120176823 BCN120176823 BCN 120176823BCN-120176823-B

Abstract

The invention discloses an optical fiber underwater acousto-magnetic integrated detection sensor based on a diamond nitrogen vacancy color center, which comprises a circular bottom plate, wherein a middle part of the circular bottom plate is provided with a hole and is fixedly connected with a multimode optical fiber in an inserted manner, the multimode optical fiber is used for being connected with an external laser pumping module and a fluorescence receiving module, the upper surface of the inner end of the multimode optical fiber is adhered with an ensemble diamond, the side surface of the end of the multimode optical fiber is coiled with a microwave antenna, the end part of the microwave antenna is fixedly connected with the circular bottom plate in an inserted manner and is used for being connected with an external microwave generating module, the outer side of the inner end of the multimode optical fiber is buckled with a cylindrical support fixed on the circular bottom plate, a permanent magnet is fixed on the inner wall of the cylindrical support, and the upper surface of the cylindrical support is covered with an acoustic-sensitive membrane magnetic material. The underwater sound signal and magnetic signal detection method can dynamically detect the underwater sound signal and magnetic signal in real time, establish the mapping relation between the underwater sound signal and the dynamic magnetic field, and realize the high-sensitivity measurement of the underwater target multi-physical-field signal.

Inventors

LI ANG
WANG CHAO
LIU SHENGCHUN
LIU ZIGENG

Assignees

哈尔滨工程大学

Dates

Publication Date: 20260508
Application Date: 20250328

Claims (1)

1. The optical fiber underwater acousto-magnetic integrated detection sensor based on the diamond nitrogen vacancy color center is characterized by comprising a circular bottom plate, wherein a middle part of the circular bottom plate is provided with a hole and is fixedly connected with a multimode optical fiber in an inserted manner, the multimode optical fiber is used for being connected with an external laser pumping module and a fluorescence receiving module, the upper surface of the inner end of the multimode optical fiber is adhered with an ensemble diamond, the side surface of the end of the multimode optical fiber is coiled with a microwave antenna, the end part of the microwave antenna is fixedly connected with the circular bottom plate in an inserted manner and is used for being connected with an external microwave generating module, the outer side of the inner end of the multimode optical fiber is fixedly buckled with a cylindrical bracket fixed on the circular bottom plate, the inner wall of the cylindrical bracket is fixedly provided with a permanent magnet, and the upper surface of the cylindrical bracket is covered with an acoustic-sensitive membrane magnetic material; The two permanent magnets are oppositely arranged on the side wall of the top of the cylindrical bracket; The outer side of the cylindrical bracket is coated with a rubber protection layer fixed on the circular bottom plate; The input end and the output end of the microwave antenna are arranged in parallel with the multimode optical fiber; the manufacturing method of the detection sensor comprises the following steps: s1, adhering the ensemble diamond to the upper surface of the multimode optical fiber end by using UV glue, and bending a single microwave antenna to coil the single microwave antenna on the end side surface of the multimode optical fiber; S2, fixing the multimode fiber and the microwave antenna on the circular bottom plate with the through holes, fixing a cylindrical support with the diameter smaller than that of the circular bottom plate on the circular bottom plate, covering an acoustic-sensitive membrane on the upper surface of the cylindrical support, and fixing the permanent magnet on the inner wall of the cylindrical support; s3, fixing a rubber protection layer which completely covers the whole cylindrical support on the circular bottom plate, and completing the manufacture of the whole detection sensor; the laser is divided into two paths through the beam splitter, one path of laser is received by the photoelectric detector, the result is input to the feedback controller, and the feedback controller is connected with the acousto-optic modulator through the control end to adjust and output laser power, so that the stability of laser power emitted by the laser is ensured, and the laser power accords with a preset value; the other path of laser is coupled into the multimode optical fiber through an optical fiber collimator, an optical path is transmitted to a detection sensor along the multimode optical fiber, the NV color center of the ensemble diamond in the detection sensor is excited by the laser and influenced by the intensity of an external magnetic field to generate a red fluorescent signal with magnetic field and sound field information, the red fluorescent signal returns to the optical fiber collimator along the multimode optical fiber and becomes space free light, the red fluorescent light passes through the beam splitter and the dichroic mirror, a filter is arranged to remove green laser, and finally the red laser is received by the photoelectric detector and the data is sent to a lock-in amplifier; When the detection sensor is placed under water, the magnetic material of the acoustic-sensitive diaphragm is vibrated according to the same law caused by the vibration of the underwater acoustic signal, the intensity of the magnetic field is correspondingly changed at the moment, the NV color center of the ensemble diamond is different in the intensity of the fluorescent light generated by different magnetic fields, the detection of the underwater sound field and the magnetic field is realized by detecting the change of the fluorescent light intensity signal, the fluorescent light intensity signal detected by the photoelectric detector in the fluorescent receiving module is sent into the lock-in amplifier for demodulation, the current magnetic field intensity is obtained, and finally, the data is transmitted into a demodulation system in a computer to obtain independent sound field signals and independent magnetic field signals.

Description

Optical fiber underwater acousto-magnetic integrated detection sensor based on diamond nitrogen vacancy color center Technical Field The invention relates to the technical field of underwater sound field and magnetic field measurement, in particular to an optical fiber underwater acousto-magnetic integrated detection sensor based on a diamond nitrogen vacancy color center. Background The underwater magnetic field detection sensor and the underwater sound field detection sensor are different from each other in development day to day, and have very wide application prospects in the fields of national defense safety, environment detection and the like. Aiming at the problems of high false alarm probability of single physical field measurement, low detection sensitivity of multi-physical field integration, signal cross interference and the like in a complex marine environment. The underwater acousto-magnetic integrated sensor can effectively solve the problem of multi-physical field integrated detection cross sensitivity, improves the multi-physical field integrated detection sensitivity of an underwater target, and can provide technical support for the underwater information countermeasure capability. Disclosure of Invention The invention aims to provide an optical fiber underwater acoustic-magnetic integrated detection sensor based on a diamond nitrogen vacancy color center, which can dynamically detect underwater acoustic signals and magnetic signals in real time, establish the mapping relation between the underwater acoustic signals and dynamic magnetic fields and realize high-sensitivity measurement of underwater target multi-physical-field signals. The invention provides an optical fiber underwater acousto-magnetic integrated detection sensor based on a diamond nitrogen vacancy color center, which comprises a circular bottom plate, wherein a middle part of the circular bottom plate is provided with a hole and is fixedly connected with a multimode optical fiber in an inserted manner, the multimode optical fiber is used for being connected with an external laser pumping module and a fluorescence receiving module, the upper surface of the inner end of the multimode optical fiber is adhered with an ensemble diamond, the side surface of the end of the multimode optical fiber is coiled with a microwave antenna, the end of the microwave antenna is fixedly connected with the circular bottom plate in an inserted manner and is used for being connected with an external microwave generating module, the outer side of the inner end of the multimode optical fiber is buckled with a cylindrical support fixed on the circular bottom plate, the inner wall of the cylindrical support is fixedly provided with a permanent magnet, and the upper surface of the cylindrical support is covered with an acoustic-sensitive membrane magnetic material. Preferably, two permanent magnets are arranged and oppositely arranged on the side wall of the top of the cylindrical bracket. Preferably, the outer side of the cylindrical bracket is coated with a rubber protection layer fixed on the circular bottom plate. Preferably, the input and output ends of the microwave antenna are arranged in parallel with the multimode optical fiber. Preferably, the manufacturing method of the detection sensor comprises the following steps: s1, adhering the ensemble diamond to the upper surface of the multimode optical fiber end by using UV glue, and bending a single microwave antenna to coil the single microwave antenna on the end side surface of the multimode optical fiber; S2, fixing the multimode fiber and the microwave antenna on the circular bottom plate with the through holes, fixing a cylindrical support with the diameter smaller than that of the circular bottom plate on the circular bottom plate, covering an acoustic-sensitive membrane on the upper surface of the cylindrical support, and fixing the permanent magnet on the inner wall of the cylindrical support; and S3, fixing a rubber protection layer which completely covers the whole cylindrical support on the circular bottom plate, and completing the manufacture of the whole detection sensor. Therefore, the optical fiber underwater acousto-magnetic integrated detection sensor based on the diamond nitrogen vacancy color center has the beneficial effects that: (1) The detection sensor can realize acousto-magnetic co-detection and can realize multi-physical field integrated measurement of underwater targets. (2) The detection sensor of the invention detects the acousto-magnetic signal and has the characteristics of high signal-to-noise ratio and high sensitivity. (3) The detection sensor can realize the efficient conversion of the underwater sound signal and the magnetic field, and effectively improves the underwater sound signal detection capability. The technical scheme of the invention is further described in detail through the drawings and the embodiments. Drawings FIG. 1 is a schematic diagram of an em