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All-fiber laser Doppler velocity measurement system based on acousto-optic zero coupler

A zero-coupling, acousto-optic technology, applied in the field of all-fiber laser Doppler velocimetry systems, can solve the problems of high cost, large insertion loss, complex structure, etc., and achieve the effect of small insertion loss, reduced optical path loss, and simplified structure

Active Publication Date: 2018-11-13
常州灵动芯光科技有限公司
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Problems solved by technology

[0006] The present invention aims to provide an all-fiber laser Doppler velocimetry system based on an acousto-optic zero coupler to overcome the above-mentioned problems or at least partially solve the above-mentioned problems, so as to solve the complex structure of the existing all-fiber Doppler vibrometer system. , large insertion loss and high cost

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  • All-fiber laser Doppler velocity measurement system based on acousto-optic zero coupler
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  • All-fiber laser Doppler velocity measurement system based on acousto-optic zero coupler

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with specific embodiments.

[0030] figure 2 It is a schematic structural diagram of an all-fiber laser Doppler velocimetry system based on an acousto-optic zero coupler provided by an embodiment of the present invention. Such as figure 2 As shown, the system includes: fiber lasers, isolators, acousto-optic zero couplers, self-focusing lenses, adjustable attenuators, fiber Bragg gratings, piezoelectric ceramics, and photodetectors. Wherein, the acousto-optic null coupler is a fiber optic null coupler. The isolator can use a fiber optic isolator to ensure that the reflected light will not return to the laser and cause damage to the laser. When using a laser with internal isolation, it is not necessary to add an isolator.

[0031] The polarized light output by the fiber laser is input to port 1 of the fiber zero coupler after passing through the fiber isolator.

[0032] When the piezoelec...

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Abstract

The invention discloses an all-fiber laser Doppler velocity measurement system based on an acousto-optic zero coupler. The system comprises a laser, an isolator, the acousto-optic zero coupler, a self-focusing lens, an adjustable attenuator, a Bragg grating, a piezoelectric ceramic and a photoelectric detector. The laser is a fiber laser. The isolator is a fiber isolator. The acousto-optic zero coupler is a fiber zero coupler. The Bragg grating is a fiber Bragg grating. In the system, the separation of signal light and reference light, the frequency shift of a light wave, and the wave combination of the signal light and the reference light are realized through using the zero coupler of acousto-optic frequency shift. One acousto-optic zero coupler realizes the functions of two couplers, oneannular device and one acousto-optic frequency shift device in a traditional light path. The structure is simplified and cost is effectively reduced. In addition, the acousto-optic zero coupler and the fiber Bragg grating used in the system are commercial single-mode fibers, which is a true all-fiber structure. Inserted losses are small and then light path losses are reduced.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to an all-fiber laser Doppler velocity measuring system based on an acousto-optic zero coupler. Background technique [0002] Laser Doppler velocimetry (LDV) has been widely used and developed rapidly due to its advantages of high velocity measurement accuracy, wide velocity measurement range, high spatial resolution, fast dynamic response, and non-contact measurement. The optical fiber can be used to send the detection beam and transmit the scattered light in a long distance or in a harsh environment, which greatly simplifies the collimation system of space light and is easy to realize distributed measurement. Therefore, the all-fiber Doppler velocimeter is a kind of Application prospect of speed sensor. [0003] figure 1 It is a typical all-fiber laser Doppler velocimetry system. Such as figure 1 As shown, a typical all-fiber laser Doppler velocimetry system in...

Claims

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Application Information

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IPC IPC(8): G01S17/58G01S7/481
CPCG01S7/4818G01S17/58
Inventor 赵建辉陆海空卜凡
Owner 常州灵动芯光科技有限公司
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