| 00:00:00 | Masterclass 4: Configuring optical parameters for laser diffraction particle size analysis |
| 00:01:05 | Masterclass 4: Configuring optical parameters for laser diffraction particle size analysis |
| 00:02:08 | The laser diffraction masterclass |
| 00:03:39 | Laser diffraction measurement process |
| 00:04:46 | Overview |
| 00:06:14 | What does laser diffraction measure |
| 00:07:02 | What does an optical model do? |
| 00:08:10 | Where do we use the optical model? |
| 00:10:08 | Scattering models: Mie Theory |
| 00:10:47 | Scattering models: Mie Theory |
| 00:11:43 | Scattering models: Fraunhofer approximation |
| 00:13:00 | Comparing the results of the scattering models |
| 00:14:27 | Mie vs Fraunhofer: Data quality advice |
| 00:15:51 | Mie vs Fraunhofer: Data quality advice |
| 00:16:16 | Configuring optical parameters |
| 00:17:00 | Which optical properties are required? |
| 00:18:39 | Determining the refractive index |
| 00:19:37 | Refractometer methods: Solution example |
| 00:20:41 | Refractometer methods: Solution example |
| 00:21:51 | Microscopy methods: Becke lines |
| 00:22:45 | Microscopy methods: Becke lines |
| 00:23:41 | Index matching: Quartz particles (RI = 1.544) |
| 00:25:25 | Empirical methods |
| 00:26:14 | Empirical methods: calculations from structure |
| 00:27:37 | The imaginary refractive index (or absorption) |
| 00:29:24 | Absorption: Volume concentration method |
| 00:30:44 | Verifying optical properties |
| 00:31:17 | Using the fit report |
| 00:32:09 | Assessing the data fit: Refractive index |
| 00:32:56 | Assessing the data fit: Absorption |
| 00:34:03 | Example of assessing the data fit |
| 00:34:57 | Assessing the fit using 1.4/0.01 |
| 00:36:46 | Using trend graphs to a range of refractive indices |
| 00:37:42 | Assessing the fit using 1.54/0.01 |
| 00:38:23 | Looking at the results |
| 00:39:15 | The Optical Property Optimiser |
| 00:39:53 | Video miniguides: Optical property optimiser |
| 00:40:22 | Software Demo Video |
| 00:43:00 | Video miniguides: Optical property optimiser |
| 00:43:14 | Method transferMS2000 emulation model |
| 00:43:41 | Samples at the edge of the dynamic range |
| 00:44:45 | Non-spherical particles |
| 00:45:26 | Conclusions |
| 00:47:07 | Contact Information |
Selecting the appropriate optical properties for particle size distribution measurement by laser diffraction can appear to be a difficult task, especially when characterizing unknown or mixed materials. In this webinar, we describe the available optical models and their recommended applications. We also describe experimental and empirical techniques available for optical property determination, and how these techniques can be applied to generate accurate and reproducible particle size distribution results.