Fourier Transform Infrared (FTIR) Analyzers

Fourier Transform Infrared (FTIR) Analyzers are laboratory and field instruments that identify and quantify chemical compounds by measuring the characteristic infrared absorption patterns of molecular bonds across a broad spectral range simultaneously, producing a complete absorption spectrum from a single measurement scan that serves as a molecular fingerprint for compound identification and mixture analysis.

The analytical core of every FTIR analyzer is a Michelson interferometer consisting of a broadband infrared source, a KBr or ZnSe beam splitter, a fixed mirror, and a motorized moving mirror. As the moving mirror translates through its defined scan range, the optical path difference between the two interferometer arms varies continuously, producing an intensity-modulated interferogram at the detector. A fast Fourier transform (FFT) algorithm converts this time-domain interferogram into a frequency-domain infrared absorption spectrum plotted in absorbance units against wavenumber from 4,000 to 400 cm⁻¹, covering the mid-infrared region where the majority of organic and inorganic functional group absorptions occur.

Spectral resolution on laboratory-grade FTIR analyzers reaches 0.5 cm⁻¹ with wavenumber reproducibility of ±0.01 cm⁻¹ maintained through HeNe laser fringe referencing of mirror displacement. Detector options include deuterated triglycine sulfate (DTGS) for standard sensitivity applications and mercury cadmium telluride (MCT) cooled with liquid nitrogen for high-sensitivity trace analysis and rapid scanning. Attenuated total reflectance (ATR) sampling accessories — using diamond, germanium, or ZnSe internal reflection elements — allow direct analysis of solids, liquids, and pastes without sample preparation, making FTIR analysis practical for high-throughput quality control workflows.

Process FTIR analyzers install inline or at-line within production processes, measuring product composition and detecting impurities in real time through fiber-optic probes immersed in reaction vessels or flow cells without interrupting process flow.

In Pakistan, FTIR analyzers are deployed in pharmaceutical manufacturing quality control, polymer and materials characterization laboratories, food adulteration testing, forensic chemical identification units, petrochemical process monitoring, and customs border control screening operations.

Tactical Supply Pakistan supplies FTIR analyzers across benchtop, portable, handheld, and process configurations for laboratory, industrial, and forensic procurement across Pakistan.