Device and method thereof for acquiring transmission fluctuation spatial correlation spectrum
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A spatial correlation, transmittance technology, applied in measurement devices, suspension and porous material analysis, particle size analysis, etc., can solve the problem of difficult mechanical positioning in the micro-interval range, and achieve the effect of improving measurement accuracy and simple measurement device.
Inactive Publication Date: 2010-05-12
UNIV OF SHANGHAI FOR SCI & TECH
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However, the beam spacing requirements can be changed during the measurement process, which involves mechanical operations. When the particle size is small, the beam spacing is required to be smaller than the particle size. It is difficult to achieve precise mechanical positioning in the micro-spacing range
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Embodiment 1
[0045] Such as figure 1 As shown, a device for obtaining the spatially correlated spectrum of transmittance fluctuations includes a light source module, a semi-reflective and semi-transparent flat glass 6, a measurement area 7, a dispersion module, and a detection and signal processing module.
[0046] The light source module is used to generate a converging polychromatic Gaussian beam in the measurement area 7;
[0047] The measurement area 7 is set in the beam waist area of the polychromatic Gaussian beam;
[0048] The dispersion module is used to collimate the polychromatic Gaussian beam passing through the measurement area 7 into parallel light, reflect it, and focus it again in the measurement area 7, and focus parallel lights of different wavelengths in the measurement area 7 along different directions after reflection, The positions of the focal points are different, that is to say, a deflection angle θ is generated between the reflected parallel beam and the inciden...
Embodiment 2
[0058] A method for obtaining a spatially correlated spectrum of transmittance fluctuations, using the device described in Embodiment 1, comprising the following steps:
[0059] Using a polychromatic light source 1, the polychromatic light beam emitted by the polychromatic light source 1 is converged by the focusing bowl 2 and the first convex lens 3, processed by the spatial filter 4, and then converged by the second convex lens 5. After passing through the plane glass 6, its focal point is located at the center of the measurement area 7, and a convergent Gaussian beam is obtained. The beam propagation direction is perpendicular to the particle flow direction, and for a certain wavelength of incident light, its intensity is I 0 (λ), when the polychromatic light beam passes through the measurement area 7, it is scattered and absorbed by the particles in the measurement area 7, and the transmitted light intensity is T 1 (λ,t)I 0 (λ), where T 1 (λ, t) is the transmittance of ...
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Abstract
The invention relates to a device and a method thereof for acquiring a transmission fluctuation spatial correlation spectrum. A polychromatic light source is used for irradiation, when the light source passes through a dispersor, the distances between an incident light focus and reflected light focuses with different wavelengths in a measurement region are different, and thus the corresponding spatial correlations are different. An incident light beam and a reflected light beam are dispersed and absorbed in the measurement region under the action of particles, thereby causing extinction. A split light beam passes through a half reflecting and half transparent plain glass and is focused on a light sensing element by a lens, thereby obtaining a transmission correlation spectrum. The invention effectively solves the problem that the particle measurement range is limited because of mechanical operation in the measurement process. A transmission fluctuation spatial correlation spectral method is irrelevant to the flow field of the particles, has simple structure and can be used for detecting a particle system in laminar flow and onflow states in real time and on line, thereby testing the particle size distribution and the concentration of micron-sized particles. The invention can be widely applied to various fields of scientific research, production and process control of chemical industry energy sources, environment protection, water quality detection and particle measurement.
Description
technical field [0001] The invention belongs to the technical field of transmittance measurement, and in particular relates to a device and a method for obtaining a space-correlated frequency spectrum of transmittance fluctuations. Background technique [0002] The transmittance fluctuation spatial correlation spectrum method uses two identical narrow laser beams placed in parallel, and the correlation spectrum is obtained by changing the spatial interval of the beams (that is, the delay parameter). Its advantage is that it has high measurement accuracy and can measure micron-sized small particles, and the obtained transmittance fluctuation correlation spectrum has nothing to do with the particle flow field (including flow direction, velocity field distribution and its fluctuation). Therefore, it is not necessary to consider whether the two beams are set in the same direction as the particle flow; particle systems in both laminar and turbulent flow regimes can be measured. ...
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