1.Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
2.Singapore-MIT Alliance for Research and Technology (SMART) Centre, Singapore 117543, Singapore
3.Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
4.Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5.Process Chemistry Development, Takeda Pharmaceuticals International Co, 40 Landsdowne St, Cambridge, MA 02139, USA
6.ShinrAI Center for AI/ML, Data Sciences Institutes, Takeda Pharmaceuticals International Co, 650 E Kendall St, Cambridge, MA 02142, USA
7.Present address: Department of Precision Instruments, Tsinghua University, Beijing 100084, China
George Barbastathis (gbarb@mit.edu)
Published:31 October 2024,
Published Online:21 August 2024,
Received:12 March 2024,
Revised:28 July 2024,
Accepted:02 August 2024
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Zhang, Q. H. et al. Non-invasive estimation of the powder size distribution from a single speckle image. Light: Science & Applications, 13, 2221-2230 (2024).
Zhang, Q. H. et al. Non-invasive estimation of the powder size distribution from a single speckle image. Light: Science & Applications, 13, 2221-2230 (2024). DOI: 10.1038/s41377-024-01563-6.
Non-invasive characterization of powders may take one of two approaches: imaging and counting individual particles; or relying on scattered light to estimate the particle size distribution (PSD) of the
ensemble
. The former approach runs into practical difficulties
as the system must conform to the working distance and other restrictions of the imaging optics. The latter approach requires an inverse map from the speckle autocorrelation to the particle sizes. The principle relies on the pupil function determining the basic sidelobe shape
whereas the particle size spread modulates the sidelobe intensity. We recently showed that it is feasible to invert the speckle
autocorrelation and obtain the PSD using a neural network
trained efficiently through a physics-informed semi-generative approach. In this work
we eliminate one of the most time-consuming steps of our previous method by engineering the pupil function. By judiciously blocking portions of the pupil
we sacrifice some photons but in return we achieve much enhanced sidelobes and
hence
higher sensitivity to the change of the size distribution. The result is a 60 × reduction in total acquisition and processing time
or 0.25 seconds per frame in our implementation. Almost real-time operation in our system is not only more appealing toward rapid industrial adoption
it also paves the way for quantitative characterization of complex spatial or temporal dynamics in drying
blending
and other chemical and pharmaceutical manufacturing processes.
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