Method and assembly for measuring the particle size of particles suspended in a fluid

Abstract

This disclosure relates to a method for measuring the particle size of particles suspended in a fluid, the method comprising: modulating radiation using a periodic wave optical mask (S1); illuminating a fluid with the modulated radiation (S2); detecting scattered and / or transmitted radiation using a 2D detector that captures an image at a first modulation frequency (S3-1); detecting scattered and / or transmitted radiation using a 2D detector that captures an image at a second modulation frequency (S3-2); extracting a first image at the first modulation frequency and a second image at the second modulation frequency, respectively (S4); calculating a first extinction coefficient for the first and second modulation frequencies, respectively, based on the first and second extracted images, respectively (S5); and determining the size of the suspended particles based on the relationship between the calculated first extinction coefficient and the calculated second extinction coefficient (S7). This disclosure further relates to an assembly for measuring the particle size of particles suspended in a fluid.

Claims

1. A method for measuring the particle size of particles suspended in a fluid, wherein the method is: Step (S1) modulates the radiation using a periodic wave optical mask, Step (S2) of illuminating the fluid with the modulated radiation, Step (S3-1) involves detecting scattered and / or transmitted radiation using a 2D detector that acquires an image at a first modulation frequency, Step (S3-2): Detect scattered radiation and / or transmitted radiation using a 2D detector that acquires an image at a second modulation frequency. Step (S4) of extracting a first image of the first modulation frequency and a second image of the second modulation frequency, Step (S5) of calculating a first absorption coefficient for each of the first and second modulation frequencies based on the first and second extracted images, The steps include determining the size of the suspended particles based on the relationship between the calculated first absorption coefficient and the calculated second absorption coefficient (S7), A method that includes this.

2. The aforementioned method, Step (S8) of calculating the true absorption coefficient based on the calculated first absorption coefficient and the calculated second absorption coefficient, Step (S9) of estimating the number density of the suspended particles based on the determined size of the suspended particles and the true extinction coefficient, Further including, The method according to claim 1.

3. The aforementioned method, The step (S10) further includes calculating the total suspended solid volume (TSSV) of the suspended particles based on the estimated number density and the determined size of the suspended particles. The method according to claim 2.

4. The aforementioned method, The further step (S11) includes calculating the dry weight based on the TSSV and the density of the particles, The method according to claim 3.

5. The aforementioned method, The method described above is repeated multiple times over time to measure particle sedimentation and to estimate the density based on the particle sedimentation (S12), further comprising the step of The method according to any one of claims 1 to 4.

6. The aforementioned method, The step (S6-1) further includes generating multiple modulation frequencies by continuously illuminating multiple masks having different modulation frequencies. The method according to any one of claims 1 to 5.

7. The aforementioned multiple masks are placed on the same base plate. The method further includes the step (S6-2) of moving the base plate to continuously shift the mask used to modulate the radiation. The method according to claim 6.

8. The aforementioned method, The step (S6-3) further includes generating multiple modulation frequencies by extracting different harmonics during the modulation process. The method according to any one of claims 1 to 5.

9. The scattering is a side scattering detected from the side by the 2D detector. The method according to any one of claims 1 to 8.

10. The mask is a square wave mask, and the harmonics are separated by one-dimensional power spectrum and spatial lock-in analysis. The method according to claim 10.

11. The aforementioned scattering is forward scattering detected by the 2D detector along the direction of radiation propagation after the liquid. The method according to any one of claims 1 to 8.

12. The mask is a square wave mask, and the harmonics are separated by two-dimensional power spectrum and spatial lock-in analysis. The method according to claim 11.

13. A method for measuring the particle size of particles suspended in a fluid, wherein the method is: Step (S1) modulates the radiation using a periodic wave optical mask, Step (S2) of illuminating the fluid with the modulated radiation, Step (S3-1) involves detecting scattered and / or transmitted radiation using a 2D detector that captures an image at a first radiation wavelength, Step (S3-2): Detect scattered radiation and / or transmitted radiation using a 2D detector that captures an image at a second radiation wavelength. Step (S4) of extracting a first image of the first radiation wavelength and a second image of the second radiation wavelength, Step (S5) of calculating the first emission wavelength and the first absorption coefficient for each of the emission wavelengths based on the first extracted image and the second extracted image, respectively, The steps include determining the size of the suspended particles based on the relationship between the calculated first absorption coefficient and the calculated second absorption coefficient (S7), A method that includes this.

14. An assembly for measuring the particle size of particles suspended in a fluid, wherein the assembly comprises: A radiation profile generator configured to provide a radiation profile, wherein the radiation profile comprises a radiation profile generator (110) having a propagation path in a second spatial dimension (102), A periodic wave optical mask configured to modulate the aforementioned radiation profile, A holder (145) for a sample (140) of a medium, wherein the holder (145) is configured such that an intensity-modulated radiation sheet can illuminate the sample, A 2D detector configured to capture at least one 2D image of the illuminated sample, Equipped with, The assembly is configured to perform the method described in any one of claims 1 to 13. assembly.

15. The radiation profile generator is configured to provide a multicolor radiation sheet (192, 292) that includes an extended radiation spectrum in a first spatial dimension (101). The assembly according to claim 12.

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