How to Measure ATR Spectra Directly in Solution with Fiber Optic Probes

Moving Beyond the Bench: In-Line FTIR Monitoring with ATR Probes

For decades, Attenuated Total Reflection (ATR) has been a standard technique for FTIR spectroscopy. However, most users are restricted to standard ATR inserts or benchtop accessories. While effective for static lab samples, these setups introduce a critical bottleneck: the sample must be extracted from the reactor and brought to the instrument.

At art photonics, we eliminate this limitation. We enable you to measure ATR spectra directly inside your solution.

The Difference Between ATR Inserts and ATR Probes

Standard inserts require a controlled laboratory environment. In contrast, art photonics ATR Probes are flexible, fiber-optic-based devices designed to bridge the gap between your spectrometer and your process line.

By immersing the probe tip directly into the reaction vessel or flow line, you achieve:

• Real-Time Kinetics: Monitor reaction progress as it happens, without the time lag of sampling loops.
• Process Safety: Eliminate the risk of handling hazardous or toxic samples manually.
• Closed-Loop Control: Feed spectral data directly into your process control system (PAT) for immediate adjustments.

Engineered for Harsh Environments

A common misconception is that fiber optic probes are fragile. Our ATR probes are engineered specifically for industrial robustness. Unlike standard inserts, our probes are built to withstand:

• High Temperatures: Operable in extreme thermal conditions typical of chemical synthesis.
• High Pressures: Designed for high-pressure reactors and flow cells.
• Chemically Aggressive Media: Shaft materials and sealing technologies selected to resist corrosion in harsh solvents.

Watch: Real-Time Monitoring in Action

To demonstrate the capability of in-line measurement, we connected our ATR Probe to a portable FTIR spectrophotometer. In the video below, you can see the dissolution kinetics of sugar in water measured in real-time. This simple setup mirrors complex industrial crystallization or dissolution processes.

Frequently Asked Questions

What is an ATR Probe?
An ATR Probe is a fiber-optic sensor that allows for the in-situ measurement of FTIR spectra by bringing the infrared light to the sample, rather than the sample to the instrument.

Can art photonics probes handle high pressure?
Yes. Our probes are designed for harsh environments, including increased pressures and temperatures found in industrial chemical processes.

Is it possible to measure FTIR spectra in solution without sampling?
Yes. Using an in-line ATR probe allows for direct immersion in the solution, enabling continuous, real-time monitoring without extraction.

Conclusion

Don't let sampling delays compromise your data. Explore how art photonics technology can bring your analytics directly into the process stream.