SYMPOSIA PAPER Published: 01 December 2022
STP163420210004

Investigating Photoacoustic Fourier-Transform Infrared Spectroscopy for Enhanced In-Service Grease Analysis

Source

Grease analysis via Fourier-transform infrared spectroscopy (FTIR) is challenging because of its unique non-Newtonian nature and time-consuming processes. Contamination and poor sample condition have historically caused a low signal-to-noise ratio, creating noisy spectra due to the lack of transmission of the infrared (IR) signal. Photoacoustic spectroscopy (PAS) is being investigated to reduce the impact of sample preparation, condition, and the ability to automate the grease FTIR processes. PAS can also be used in tandem with a purging gas such as nitrogen or helium to increase accuracy. Improving the signal-to-noise ratio by removing the need to transmit the IR beam through the sample provides higher-resolution scans, allowing for greater peak resolution and intensity. This improves the accuracy of measured parameters such as moisture and chemometrics. Future applications could include an analysis to quantify the percentage composition of mixed lubricants and the ability to perform an analysis in situ of lubricants adhered to component parts. These parameters are limited by current technology.

Author Information

Smith, Troy, E.
MRG Laboratories, York, PA, US
Janosky, Richard, J.
MRG Laboratories, York, PA, US
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Details
Pages: 247–255
DOI: 10.1520/STP163420210004
ISBN-EB: 978-0-8031-7715-4
ISBN-13: 978-0-8031-7714-7