LUMOS II FTIR Imaging Microscope

Importance of the Topic

The combination of Fourier-transform infrared (FTIR) spectroscopy with microscopy and imaging delivers unique molecular insights at the micron scale. By integrating spectral and spatial information, analysts can identify chemical compositions, detect contaminants and assess material homogeneity in fields such as pharmaceuticals, polymers, electronics and life sciences. The accessibility and speed of modern FTIR imaging microscopes are vital for routine use in research, quality control and failure analysis.

Objectives and Study Overview

This document presents the design philosophy, performance features and application range of the LUMOS II FTIR imaging microscope from Bruker. It aims to demonstrate how fully automated hardware, intuitive software and innovative calibration technologies can reduce user training requirements while delivering high-resolution spectral images. Key objectives include validating instrument speed, sensitivity and ease of use across diverse sample types.

Used Instrumentation

• LUMOS II FTIR Imaging Microscope with motorized, software-controlled sample stage
• Focal-Plane Array (FPA) detector for rapid hyperspectral imaging
• PermaSure+ pixel-by-pixel laser wavenumber calibration
• Detector options: TE-MCT (no liquid nitrogen), DTGS and LN2-cooled MCT
• Retractable germanium ATR crystal with piezo-electric drive
• Optional ALPHA II macro accessory for large-area transmission, reflection and ATR sampling

Methodology and Instrumentation

The LUMOS II supports transmission, reflection and attenuated total reflection (ATR) modes, all fully automated via guided software workflows. FTIR imaging collects a full interferogram spectrum at each pixel, enabling false-color chemical maps that highlight compositional differences. The wide field-of-view (1.49 × 1.12 mm2) and submicron spatial resolution (0.6 µm/pixel) facilitate rapid large-area scans. The sealed optical path eliminates the need for purge gas, while PermaSure+ ensures long-term spectral accuracy by calibrating each pixel’s wavenumber against a laser standard.

Main Results and Discussion

Performance tests confirm ultrafast data acquisition in both mapping and FPA modes. The TE-MCT detector provides high sensitivity single-point spectra without liquid nitrogen, reducing operational burden. Imaging of polymers, pharmaceutical tablets and microelectronic components demonstrates clear detection of inclusions, API/excipient distributions and surface contaminants. Retractable ATR accessories enable direct microscale ATR imaging of soft, sticky or brittle materials. Comparative studies highlight consistent calibration across the array, leading to reproducible peak positions and quantitative reliability.

Benefits and Practical Applications

• Polymers: Identify inclusions, laminate structures and compositional inhomogeneities.
• Pharmaceuticals: Compliant with cGMP/GLP and 21 CFR Part 11 for tablet, granule and powder analysis.
• Electronics and Automotive: Failure analysis of coatings, springs, chips and engine parts.
• Surface Treatments: Imaging of organic and inorganic coatings for homogeneity assessments.
• Life Science: Tissue section mapping for protein, lipid and biomarker distributions.
• Environmental and Particle Analysis: Quantification and identification of microplastics or filter residues.

Future Trends and Potential Applications

Advances in detector technology and machine-learning-driven spectral analysis will further accelerate FTIR imaging workflows. Integration with automated sample handling and correlative microscopy techniques (Raman, SEM) will expand multimodal studies. Cloud-based spectral libraries and remote operation are poised to make high-throughput chemical imaging accessible to distributed laboratories.

Conclusion

The LUMOS II exemplifies a new generation of FTIR imaging microscopes that balance performance, automation and user-friendliness. Its flexible detector options, precise calibration, and guided software enable rapid adoption in academic and industrial settings. By streamlining spectral imaging workflows, it empowers analysts to obtain reliable, high-resolution chemical maps with minimal training effort.