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A high-speed and high-throughput particle velocimetry system based on optical time stretching

A time-stretching, high-throughput technology, which is applied in radio wave measurement systems, measurement devices, electromagnetic wave re-radiation, etc., to achieve the effect of increasing detection throughput and increasing the upper limit

Active Publication Date: 2021-07-13
BEIJING UNIV OF CHEM TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the defect that the above-mentioned technology cannot complete the velocity measurement of high-speed and high-throughput particles, the present invention proposes a high-speed and high-throughput particle velocity measurement system based on optical time stretching

Method used

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  • A high-speed and high-throughput particle velocimetry system based on optical time stretching
  • A high-speed and high-throughput particle velocimetry system based on optical time stretching
  • A high-speed and high-throughput particle velocimetry system based on optical time stretching

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Embodiment 1

[0036] The center wavelength of the optical pulse output by the light source 1 used in this embodiment is 1560 nm, the bandwidth is 15 nm, and the pulse repetition frequency is 25 MHz.

[0037] like figure 2 As shown, the time stretching module 2 includes a single-mode dispersion compensating optical fiber 11 with a dispersion of 1200 ps / nm, which is installed at the light output measurement of the light source 1, and is used to map the spectral information of the optical pulse to its time-domain waveform one by one to complete the optical fiber. Time-wavelength mapping of pulses. The space mapping module 3 adopted in this embodiment includes a transmissive space mapping module, which is output to the space by the fiber collimator 12, and enters the first lined diffraction grating 13 with a line density of 1200 lines / mm at an incident angle of 80°. According to the raster formula

[0038]

[0039] where θ 1 is the incident angle of the light pulse, θ 2 is the exit angl...

Embodiment 2

[0045] The difference between this embodiment and Embodiment 1 is that the space mapping module 3 used in this embodiment includes a reflective space mapping module.

[0046] like Figure 5 As shown, the time stretching module 2 includes a single-mode dispersion compensating optical fiber 11 with a dispersion of 1200 ps / nm, which is installed at the light output measurement of the light source 1, and is used to map the spectral information of the optical pulse to its time-domain waveform one by one to complete the optical fiber. Time-wavelength mapping of pulses. The space mapping module 3 adopted in this embodiment includes a reflective space mapping module, and the optical pulse from the single-mode dispersion compensating fiber 11 is transmitted to the fiber collimator 12 by the fiber circulator 20, and then output to the space by the fiber collimator 12, Incident angle of 80° is incident on the first reticle diffraction grating 13 with a reticle density of 1200lines / mm. A...

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Abstract

A high-speed and high-throughput particle velocimetry system based on optical time stretching, including sequentially connected light source (1), time stretching module (2), space mapping module (3), amplifier (4), beam splitter ( 5), the output end of the beam splitter (5) is two-way output, which is divided into an upper branch (6) and a lower branch (7), and the upper branch of the output of the beam splitter (5) is connected with a spectrum analyzer ( 8), the output lower branch of the beam splitter (5) is connected with a photodetector (9) and a data acquisition processor (10). The system uses optical time-stretching technology to complete high-speed line scanning of particles, breaking through the speed limit and flux limitation of conventional particle velocimetry methods, and effectively improving the speed limit and detection throughput of particle velocimetry.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and relates to a high-speed and high-flux particle velocity measurement system based on optical time stretching. Background technique [0002] Particle flow velocity detection has important applications in real life, production and scientific research, such as disease detection, internal combustion engine fuel injection control, and particle electrophoretic mobility measurement. Achieving high-speed and high-throughput particle velocity measurement is a key issue and a long-standing challenge. [0003] At present, for particle velocimetry, commonly used techniques include Laser Doppler Velocimetry and Particle Image Velocimetry. Among them, the laser Doppler velocimeter uses the Doppler frequency shift that occurs when the light hits the moving particles to complete the particle velocity measurement. It has been applied to the field of biomedicine for disease detection (M. Stucker, V. Bai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/58G01S7/481
Inventor 丁迎春俞力奇冯祺何惠梅邢晓星
Owner BEIJING UNIV OF CHEM TECH
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