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Object steering detection device based on vortex light rotation Doppler effect

A Doppler effect and detection device technology, which is applied in the field of beat frequency detection and phase modulation of light beams, can solve problems such as the inability to accurately and effectively obtain information about the rotation direction of objects

Active Publication Date: 2019-04-16
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology

[0012] The problem solved by the technology of the present invention is: Aiming at the problem that the existing non-contact detection device for rotating objects cannot accurately and effectively obtain the relevant information about the direction of rotation of the object when the object rotates at high speed or cannot be distinguished by the naked eye, a device that uses vortex light to accurately detect the rotating object is designed. A device for determining the direction of rotation of an object

Method used

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  • Object steering detection device based on vortex light rotation Doppler effect
  • Object steering detection device based on vortex light rotation Doppler effect
  • Object steering detection device based on vortex light rotation Doppler effect

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[0062] specific implementation plan

[0063] In the present invention, a light beam with a special structure is used as a detection carrier, and the specific implementation steps are as follows:

[0064] First, the laser (1) produces a laser beam, which becomes horizontally polarized light after passing through the polarizer (2), because the spatial light modulator only has a good modulation effect on horizontally polarized light, and the laser beam is transformed by the collimating beam expander lens group 1 and 2 The resulting light beam is adjusted and then shines directly on the SLM display.

[0065] Load a customized hologram on the SLM, such as figure 2 As shown, the hologram loaded with l=30 is as figure 2 As shown in (a), the generated vortex light effect diagram is as follows figure 2 (c) shown.

[0066] Afterwards, the vortex beam is irradiated on the plane reflector (14) to adjust the direction of the optical path, and then the vortex beam is divided into two...

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Abstract

The invention relates to an object steering detection device based on vortex light rotation Doppler effect. The device mainly comprises a vortex light preparation part and scattered light signal detection part. The vortex light preparation part mainly comprises an He-Ne laser, a polaroid, a lens group, a spatial light modulator and a plane mirror, and the scattered light signal detection part mainly comprises a combination imaging telescope, a multi-mode optical fiber, a photoelectric detector and a micro oscilloscope. Firstly, a Gaussian beam is generated by a laser, and a spatial light modulator loaded with a specific hologram is irradiated and loaded after being collimated to prepare vortex light; secondly, the vortex light transmission rotating speed is omega d, and then is irradiatedon a rotating object, and after the object is scattered, scattered light is collected through the convex lens group, beat-frequency coupling is realized under the action of the beam splitter prism andthe original vortex light; and finally, the intensity change of the coupling light beam is detected by utilizing the photoelectric detection and transmitting the signal to the oscilloscope, Fourier transformation is carried out on the oscilloscope, and object steering can be judged according to the frequency spectrum information. The device is simple in structure and can still work effectively under various extreme conditions.

Description

technical field [0001] The invention mainly relates to the fields of optoelectronics and signals, in particular to technical methods such as phase modulation and beat frequency detection of light beams. technical background [0002] Photons carry angular momentum as early as 1909. Poynting proposed this concept, and it was related to the polarization state of light. In 1936, the spin angular momentum of photons was successfully verified by Beth and others using mechanical experiments, and the left and right circular polarizations were measured. The spin angular momentum of light. [0003] In 1992, Allen showed through research that photons also carry another form of momentum, called orbital angular momentum. The light carrying this kind of orbital angular momentum is called vortex light, which can be prepared by spiral phase plate, spatial light modulator, computational holography, etc. The vortex light has a circular intensity distribution and a spiral phase distribution, ...

Claims

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Application Information

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IPC IPC(8): G01P13/04
CPCG01P13/04
Inventor 任元邱松王琛刘通高廷阁胡晓东李智猛邵琼玲
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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