[Academic] Seminar at lunchtime today.

[David McKee]

Quick reminder that we have a lunchtime seminar today over in HW113-114. 
Holographic imaging by Dr Alex Nimmo-Smith from the University of 
Plymouth. All welcome!

David

On 31/05/2016 10:59, David McKee wrote:
> Dear Colleagues
>
> The Institute of Biophotonics is hosting a seminar on holographic 
> imaging next week (7th June, 12-1pm, HW113-114).  I know the speaker 
> well and expect it will be a good talk!  More info below.
>
>
>
>
> Seeing is believing: holographic imaging of marine suspended particles
>
> Alex Nimmo Smith
>
> School of Marine Science & Engineering, Plymouth University, UK
> alex.nimmo.smith at plymouth.ac.uk
>
> Abstract
>
> Particles suspended in the sea play a significant role in many of the 
> biogeochemical processes of central importance to our changing world. 
> They may be of biological or mineral origin, and hence occur in a 
> myriad complex forms. In addition to their fundamental nature, key 
> characteristics of suspended particles are their size (which may vary 
> from submicron to millimeter scales) and effective density. For 
> example, small particles tend to be better scatterers of light, while 
> large particles tend to settle more quickly and so are important to 
> mass transport. Added complexity arises from the flocculation and 
> disaggregation of particles as they interact within the varying 
> turbulence of the natural environment, leading to changes in the size 
> distribution and settling characteristics of the particle population.
>
> In situ measurements of particle parameters are often performed with 
> laser scattering (LISST) instruments, but these assume the particles 
> are (nearly) spherical and provide no information on their nature. 
> Floc-cameras have also been utilised to image particles in situ, but 
> usually suffer from limited resolution or a small depth-of-field, so 
> restricting sample volume size.
>
> Here we discuss the application of holography to the characterisation 
> of suspended particles, and how these measurements enable clearer 
> understanding of the particle populations and associated optical 
> scattering characteristics in waters around the UK. A variety of 
> digital in-line holographic systems have been developed and deployed 
> that allow the in situ imaging of all particles O(micron to mm) within 
> relatively large sample volumes O(ml). Digital reconstruction of the 
> recorded holograms allows the automatic extraction of in-focus images 
> of each particle, from which key characteristics (size, shape, nature) 
> may then be derived.
>
>
> -- 
>
>
>
>

-- 
Dr David McKee
Senior Lecturer
Physics Dept, University of Strathclyde
Glasgow, G4 0NG, Scotland
Tel: +44 (0)141 548 3068
Fax: +44 (0)141 552 2891
http://bcp.phys.strath.ac.uk/marine/