PIKE DiffusIR™ Diffuse Reflectance Accessory
| Brand | PIKE |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Import Status | Imported |
| Model | 16x-xxxx |
| Price | USD 1,400 (approx.) |
Overview
The PIKE DiffusIR™ Diffuse Reflectance Accessory is a research-grade optical interface engineered for quantitative and qualitative analysis of opaque, heterogeneous, or highly scattering solid samples in Fourier Transform Infrared (FTIR) spectroscopy. Based on the principles of diffuse reflectance spectroscopy—specifically the Kubelka-Munk theory—the accessory enables conversion of raw reflectance data into absorption-like spectra, facilitating direct comparison with transmission reference libraries. Designed for compatibility with major benchtop FTIR platforms—including Varian (Agilent), Shimadzu, Bruker, Thermo Fisher Scientific, PerkinElmer, and JASCO—the DiffusIR™ mounts securely to the instrument’s sample compartment via a standardized baseplate interface. Its monolithic mirror assembly—machined from high-purity aluminum and electrochemically polished—ensures long-term thermal stability and minimal spectral distortion across the mid-infrared (MIR: 4000–400 cm⁻¹) and near-infrared (NIR: 14,000–4000 cm⁻¹) ranges, depending on optical configuration.
Key Features
- Monolithic, precision-machined aluminum mirror with optimized surface geometry for uniform light distribution and minimized specular contribution
- Modular baseplate mounting system compatible with standard FTIR sample compartments without mechanical modification
- High optical throughput design achieves improved signal-to-noise ratio (SNR) over conventional integrating spheres, particularly in the 2000–600 cm⁻¹ region
- Two standard configurations available: MIR-optimized (KBr-coated optics, 4000–400 cm⁻¹) and NIR-optimized (quartz-enhanced path, 14,000–4000 cm⁻¹)
- Interchangeable sample cups (3 mm, 5 mm, and 13 mm depth) support variable sample mass and particle size distributions
- Designed for reproducible packing density control—critical for quantitative Kubelka-Munk analysis of pharmaceutical powders, catalysts, and geological specimens
Sample Compatibility & Compliance
The DiffusIR™ accommodates a broad range of solid-state materials, including but not limited to: pharmaceutical tablets and excipients, polymer granules, soil and mineral powders, catalyst supports (e.g., Al₂O₃, SiO₂, zeolites), carbon black composites, and biological tissues (freeze-dried or lyophilized). Sample preparation follows ASTM E1252-98 (Standard Practice for General Techniques for Quantitative Infrared Analysis Using Diffuse Reflectance) and ISO 18387:2015 (Optics and photonics — Vocabulary for infrared spectroscopy). When used with validated SOPs and calibrated standards, the accessory supports GLP-compliant workflows in QC laboratories and meets documentation requirements for FDA 21 CFR Part 11 audit trails when integrated with compliant FTIR software environments (e.g., OPUS, Spectrum, or OMNIC with electronic signature modules).
Software & Data Management
No proprietary software is required; the DiffusIR™ operates transparently within the host spectrometer’s native acquisition suite. Raw intensity reflectance spectra are acquired in standard interferogram format (.ifg or .spa), then processed using built-in Kubelka-Munk transformation algorithms. Spectral preprocessing—including atmospheric compensation (H₂O/CO₂ correction), baseline offset removal, and vector normalization—is fully scriptable in MATLAB, Python (via SciPy/NumPy), or commercial chemometric packages (e.g., Unscrambler X, Pirouette). All metadata—including aperture settings, number of scans, resolution (typically 4 cm⁻¹ or 8 cm⁻¹), and sample cup ID—are embedded in the spectrum header per JCAMP-DX v6.00 specification, ensuring traceability and interoperability across LIMS and ELN systems.
Applications
- Quantitative assay of active pharmaceutical ingredients (APIs) in blended powders without dissolution or KBr pelletization
- In-process monitoring of polymer crystallinity and filler dispersion in compounding lines
- Speciation analysis of iron oxides and clay minerals in environmental core samples
- Surface oxidation state mapping of supported metal catalysts pre- and post-reaction
- Moisture content profiling in hygroscopic food powders using NIR-DRIFTS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy)
- Non-destructive authentication of cultural heritage pigments and binding media in conservation science
FAQ
Is the DiffusIR™ compatible with my existing FTIR spectrometer?
Yes—provided your instrument features a standard sample compartment with ≥70 mm vertical clearance and accepts removable baseplate accessories. Full compatibility matrices for specific models (e.g., Bruker Tensor II, Thermo Nicolet iS50) are available upon request.
What sample preparation protocols are recommended for quantitative analysis?
Samples should be homogenized, sieved to <250 µm, and diluted with spectroscopic-grade KBr (for MIR) or microcrystalline cellulose (for NIR) at fixed dilution ratios. Packing pressure must be standardized using a mechanical press (e.g., 5-ton force for 30 s) to ensure consistent optical path length.
Can the DiffusIR™ be used for temperature-controlled measurements?
Yes—PIKE offers an optional heated stage variant (DiffusIR™ HT) supporting operation from ambient to 250 °C under inert purge gas, with integrated thermocouple feedback and PID control.
Does the accessory require recalibration between instruments?
No—optical alignment is factory-set and mechanically stable. However, intensity normalization using a certified PTFE reflectance standard (e.g., NIST SRM 1921b) is recommended before each analytical session.
Are replacement parts and service support available globally?
Yes—PIKE maintains an authorized service network across North America, Europe, and APAC. Mirror assemblies, sample cups, and purge adapters are stocked with lead times under 10 business days.
