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Method and equipment for measuring diffusion spectrum in non-ergodic system with high-speed charge coupled imaging system

A charge-coupled imaging and diffusion spectroscopy technology, which is used in measurement devices, scattering characteristics measurement, radiation control devices, etc., and can solve problems such as the inapplicability of single-mode fibers

Inactive Publication Date: 2002-05-15
FUDAN UNIV
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Problems solved by technology

However, for the electrorheological fluid under the electric field, which is non-ergodic and has a very fast structural response (on the order of milliseconds), the ensemble averaging includes not only time averaging, but also spatial averaging. Therefore, the single-mode fiber method has been not applicable anymore

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  • Method and equipment for measuring diffusion spectrum in non-ergodic system with high-speed charge coupled imaging system
  • Method and equipment for measuring diffusion spectrum in non-ergodic system with high-speed charge coupled imaging system
  • Method and equipment for measuring diffusion spectrum in non-ergodic system with high-speed charge coupled imaging system

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Embodiment 1

[0019] Embodiment 1: light source Nd: YAG laser (CrystaLaser LC GCL-150-S): power is 150mW, TEM 00 The mode and wavelength are 532nm, the coherence length exceeds 100m, the output power is stable (power fluctuation within 24 hours figure 2 , by comparison, the τ measured by the CCD method agrees well with the τ measured by the ALV, thus verifying the correctness of the method of the present invention.

Embodiment 2

[0020] Embodiment 2: The light source is the same as Embodiment 1. Sample carbon doped TiO 2 / Silicone oil system, TiO 2 With a very high dielectric constant (80-100), organic carbon is doped into TiO at 400°C 2 , can be changed by changing TiO 2 The content of DDA in the powder changes the TiO 2conductivity. The volume fraction of the system is 0.33%. Experiment 1. Static measurement, when the DC electric field is 600V / mm and the AC electric field is 3000V / mm, the different conductivity (TiO 2 Diffusion coefficient D of samples with different carbon content) changes with time, as shown in the attached image 3 and 4 . Figure 5 is the variation of the diffusion coefficient with time under different DC electric fields. image 3 and Figure 5 Each curve contains a peak and a valley, and the peak can be considered to be caused by dipole interaction. As the electric field increases, the peaks gradually disappear and the valleys remain, which is due to the dominance of ...

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Abstract

The invention relates to a method and system used to observe the evolvement procedure of dynamic structure of non-ergodic system under strong electric field with higher voltage fraction by using a high speed CCD image system to measure the diffused spectrum. There is no suitable method to measure said evolvement procedure by using prior art technique. Through auto-correlation function and diffused transmittance of measured specimen and observing formation of structure of electricity rheological liquid system, the conclusion obtained is that at least two factors play important roles in electricity rheologic procedure: interaction of net change, interaction of dipole. Thus it gives a good explantation for each electricity rheologic mechanism. The system is neat, particular suitable to soft matter with quick response structure such electricity rheologic, magnetism rheologic liquid and blood.

Description

technical field [0001] The present invention uses a high-speed charge-coupled imaging system (CCD, Charge-Coupled Device) to measure a diffusion spectrum (DWS, Diffusing Wave Spectroscopy) method to observe a non-ergodic system with a higher volume fraction under a strong electric field, such as an electrorheological fluid system. Dynamic structure plays. process. Background technique [0002] Traditional DWS experiments are probed using single-mode fiber (SMF). After the laser beam passes through the sample, the scattered light at a certain point is received by the optical fiber, and the signal is received by the photomultiplier tube (ALV's single photon detector, SPD) and enters the correlator. The software provided by ALV can measure the autocorrelation function. There are certain applications in various ergodic systems such as colloidal suspensions, sand piles and foams. For ergodic systems, the time average means the ensemble average of the whole. However, for the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00G01N21/47G01N33/48H01L27/148
Inventor 董翔蒋勇刚徐骏张莉菲周鲁卫
Owner FUDAN UNIV
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