| 摘要 |
The invention relates to the measurement of the granulometry of a cloud of particles or of the roughness of a surface in real time and without contact, by means of an apparatus comprising: a convergent lens (9) adapted for forming a diffraction pattern of the cloud of particles or of the surface: multiplier means (10) adatped for multiplying this diffraction pattern, in intensity, by a function f(r) such that A(r1.5+Bro4)<f(r)<A (r4+Bro4) with A=constant determined by calibration of the apparatus B=constant: o<B<0.1 r=distance measured in the focal plane of the lens with respect to the optical axis thereof, ro=maximum useful radius of the spatial filter, and means (11, 24) adapted for carrying out a reverse Fourier transform on the result of the above intensity multiplication, whose result forms the desired spectrum of the granulometry of the cloud of particles or the desired spectrum of the roughness of the surface.
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