Hyperspectral Raman Image of an emulsion

OVERVIEW This file provides the hyperspectral Raman image (hypercube) of Emulsion B from:Andrew, Jeremy J.; Browne, Mark A.; Clark, Ian E.; Hancewicz, Tom M.; Millichope, Allen J. (1998). Raman imaging of emulsion systems. Applied Spectroscopy, 52(6), 790–796. It is a well-known dataset in the chemometric community, often used for teaching and benchmarking multivariate imaging methods. It has been widely used in papers, courses, and software demos (e.g., PCA, ICA, NMF, cluster mapping, band-integration maps ...). CONTENTS File name: Emulsion_B.mat Variables inside the .mat: Emulsion_B — numeric array, size [60 × 60 × 253] (Y × X × spectral channels). Each pixel (y, x) stores one Raman spectrum along the 3rd dimension. ramanshift — numeric vector, [1 × 253], units cm⁻¹. Generated (non-linear) Raman-shift axis aligned to the reference. License: CC BY 4.0Version: 1.0 REFERENCE Article:Andrew, Jeremy J.; Browne, Mark A.; Clark, Ian E.; Hancewicz, Tom M.; Millichope, Allen J. (1998). Raman imaging of emulsion systems. Applied Spectroscopy, 52(6), 790–796. Authors and affiliations: Jeremy J. Andrew — Unilever Research U.S., Edgewater Laboratory, 45 River Road, Edgewater, NJ 07020, U.S.A. Mark A. Browne — Kinetic Imaging Ltd., South Harrington Building, Sefton Street, Liverpool L3 4BQ, U.K. Ian E. Clark — Unilever Research, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral L63 3JW, U.K. Tom M. Hancewicz — Unilever Research U.S., Edgewater Laboratory, 45 River Road, Edgewater, NJ 07020, U.S.A. Allen J. Millichope — Unilever Research, Port Sunlight Laboratory, Quarry Road East, Bebington, Wirral L63 3JW, U.K. INSTRUMENTAL CONTEXT Raman microscope: Instruments SA Explorer + Olympus BH2 Excitation: 633 nm HeNe (approx. 20 mW at source; approx. 5 mW at sample) Objective: Olympus MS Plan 80× ULWD, NA 0.75; confocal spatial filtering Spatial resolution: ~1 µm lateral; ~2 µm axial Spectral resolution (nominal): ~9 cm⁻¹ Spectral range in the paper: ~942–1823 cm⁻¹ Typical map: ~60 × 60 pixels at ~1 µm sampling; per-pixel acquisition often 2 × 30 s DIFFERENCES WITH THE ORIGINAL PAPER The original paper reports ~285 spectral samples across ~942–1823 cm⁻¹.This circulating dataset contains 253 channels and exhibits: Missing x-axis (wavenumber not stored). We have reconstructed the x-axis based on matching with the original paper figures. Spectral range trimming (likely cutting the extremes vs. the paper). Baseline handling. These undocumented steps explain the differences with the publication. CHANGELOG v1.0 — Initial public release: Emulsion_B (60×60×253) plus generated ramanshift (1×253); axis aligned to the reference as described above.