ATR Loop InfraRed Fiber Optic Probes

ATR Loop InfraRed Fiber Optic Probes

ATR Loop Infrared PIR-fiber probes are designed for use with FTIR and other Mid IR spectrometers. ATR Loop PIR-fiber probes are ideal for remote analysis of the composition of liquids, pastes and soft surfaces with no need in sample preparation.
ATR Loop Infrared PIR-fiber probes enable low-cost ATR-spectroscopy.



Key Features

  • High throughput at mid-infrared range
  • On-line absorbance spectroscopy of liquids, pastes & soft solid surfaces
  • Compatible with all FTIR, QCL and IR-Filter spectrometers
  • Cost-effective alternative to more expensive ATR-IR-fiber probes
  • Replaceable ATR Loop PIR-fiber tips


  • Remote evanescent absorption (ATR) spectroscopy in-situ
  • Multiple ATR spectroscopy by immersion of fiber loop in a liquid
  • In-vivo molecular spectroscopy for medical diagnostics by simple touch of ATR Loop to skin or tissue


Probe typeChalcogenide-IR (CIR)Polycrystalline-IR (PIR)
Transmission range6500 – 1700cm -13600 – 600cm -1
Fiber typeChalcogenide glass (As-S)Silver Halide (AgCl:AgBr)
Temperature range≤ 90°C≤ 100°C


Total Length1 m (opt.: PIR up to 5m, CIR up to 10m) *
Shaft Length120 mm *
Shaft Diameter10 mm
Shaft MaterialPEEK
Protective Tube MaterialPEEK
Input / Output ConnectorsLong SMA-905 (opt.: any other type)
Detachable PIR fiber LoopLoop; Multi-Loop (Double-, Triple-Loop, etc.)

*Customized dimensions are available on request