Method and device for simultaneously measuring droplet position, particle sizes and complex refractive index

A complex refractive index, particle size technology, used in measurement devices, optical devices, particle and sedimentation analysis, etc.

Inactive Publication Date: 2011-04-06
ZHEJIANG UNIV
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Problems solved by technology

If the particle side scattering recording method is used, the object light wave is mainly reflected light and refracted light, and it is expected to digitally reconstruct the three-dimensional spatial position and light inte

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  • Method and device for simultaneously measuring droplet position, particle sizes and complex refractive index
  • Method and device for simultaneously measuring droplet position, particle sizes and complex refractive index
  • Method and device for simultaneously measuring droplet position, particle sizes and complex refractive index

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Embodiment Construction

[0046] Referring to the accompanying drawings, the implementation method of the present invention will be described in detail below.

[0047] Among the present invention, be used for realizing the device of simultaneously measuring droplet particle position, particle size and complex refractive index method, comprise highly coherent laser 1, the spatial filter that microscopic objective lens 2 and pinhole diaphragm 3 are formed, beam expander lens ( Collimating beam expander) 4, beam splitter 5, total reflection mirror 6, light intensity attenuator 7, mixing mirror 8, industrial microscope lens 9, CCD camera 10, hologram processor and processing software 11.

[0048] Such as figure 1 As shown, the laser light emitted by laser 1 (the coherence length is required to be more than 10cm) is converged by a microscope objective lens (10X-50X), and a pinhole diaphragm 3 (aperture 5μm-100μm) is placed at its focus to achieve low-pass filtering, and then The collimated beam expansion i...

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Abstract

The invention relates to technology for simultaneously measuring multi-phase flow particles online through multi-parameter, and aims to provide a method and a device for simultaneously measuring droplet positions, particle sizes and a complex refractive index. The method comprises the following steps of: (1) dividing a highly coherent continuous laser beam into two beams after spatial filtering and collimating beam expansion, wherein one beam radiates particles in a detected flow field region, and the other beam is used as a reference beam; (2) mixing scattered light of a lateral 30-degree to 90-degree region of particles in the detected flow field region and the attenuated reference beam to perform interference so as to form a hologram, storing the hologram in a computer after being recorded by a digital camera through an imaging device; (3) acquiring a series of reconstructed images of the detected particles along the depth direction by utilizing digital reconstruction technology; and (4) identifying the reflective spot and the refractive spot of the particles from the reconstructed images by utilizing digital image processing technology so as to acquire space coordinates and scattered light intensity ratios. Compared with rainbow measurement technology, the measurement method has the advantages that: a light path system of the measurement device is relatively simple and is easy to implement.

Description

technical field [0001] The invention relates to a simultaneous on-line measurement technology of multiple parameters of multiphase flow particles, in particular to a method and device for simultaneously measuring the position, particle diameter and complex refractive index of liquid droplet particles. Background technique [0002] Spray is a complex gas-liquid multiphase flow, which has a wide range of application backgrounds in industrial applications, such as atomization mixing, jet flow, liquid fuel atomization combustion, etc. After liquid atomization, droplet size, velocity, concentration, etc. are important indicators to measure the atomization performance of nozzles. At the same time, parameters such as droplet refractive index and temperature are of great significance to the study of atomized droplet heat transfer, evaporation and combustion mechanisms. Therefore, in order to better understand and understand the mechanism of atomization and spray combustion, develop ...

Claims

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Application Information

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IPC IPC(8): G01B11/00G01N15/02G01N21/45
Inventor 吴学成岑可法陈玲红周昊邱坤赞奇哈·科里昂
Owner ZHEJIANG UNIV
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