Optical gas sensors play an increasingly important role in many applications. Sensing
techniques based on mid-infrared absorption spectroscopy offer excellent stability …

The detection and measurement of gas concentrations using the characteristic optical
absorption of the gas species is important for both understanding and monitoring a variety of …

A high-precision photoacoustic (PA) gas analyzer for fast dynamic measurement of ambient
nitrogen dioxide (NO2) was developed. The PA analyzer used a differential PA cell …

The use of the photoacoustic effect to gauge the concentration of gases is an attractive
alternative in the realm of optical detection methods. Even though the effect has been …

Atmospheric aerosols, solid or liquid particles suspended in the atmosphere, range in size
from 1 nm to> 100 μm and come from a wide variety of sources. 1 As such, aerosols have a …

Power transformers play a vital role in power transmission systems from the energy source
to the consumption center. In situ diagnostics of the performance of power transformers …

Update based on the original article by Frans JM Harren, Gina Cotti, Jos Oomens, Sacco te
Lintel Hekkert, Encyclopedia of Analytical Chemistry,© 2000, John Wiley & Sons, Ltd. time …

Methane is the most frequently analyzed gas with different concentrations ranging from
single ppm or ppb to 100%. There are a wide range of applications for gas sensors including …

Fiber‐based quartz enhanced photoacoustic spectroscopy (QEPAS) is a method for trace
gas sensing with excellent properties such as high sensitivity and strong applicability. It has …

Health monitoring of gas insulated apparatus is critical to improve the reliability and to
reduce the life cycle cost. Among the various methods for monitoring, optical sensing …