Determination of Photoacoustic Detection in Michelson Interferometer Cavity| Chapter 6 | New Trends in Physical Science Research Vol.3

In an attempt to link the photoacoustic effect to the Michelson fringe shift as a result of changes in the cell, we present photoacoustic (PA) signal detection in a cell positioned within the Michelson interferometer cavity. IR absorption was used to evaluate both detection systems, and their sensitivities were compared. The absorbed energy is released as a localised pressure wave, or sound wave, in photoacoustic spectroscopy (PA). Using a range of materials, including essential oils and the plant components from which they are commonly harvested, signals linked to the Michelson interferometer fringe and the PA effect have demonstrated excellent connections with each other. The results were promising, and they will pave the way for the widespread use of the combined Michelson interferometer-photoacoustic spectroscopy (PAS) in trace gas detection for a variety of applications. In the realm of portable trace gas detection systems, simultaneous detection of both signals using the new combination technology offers an alternative to expensive lasers, which are replaced by a low-cost wideband-pulsed IR source with good capabilities.

Author(s) Details:

Mohammad I. Abu Taha,
Physics Department, College of Science and Technology, Al-Quds University, Jerusalem, Palestine.

Ahmed S. Jabr,
The School of Science Research, Al Qusais, Dubai, United Arab Emirates.

Please see the link here: https://stm.bookpi.org/NTPSR-V3/article/view/6825

Applications of Optical Interferometer Techniques for Precision Measurements of Changes in Temperature, Growth and Refractive Index of Materials: A Brief Review | Chapter 6 | Current Approaches in Science and Technology Research Vol. 11

 Different interferometer techniques are discussed, as well as their applications. The idea of optical heterodyne detection is presented in depth, as well as its applications to in situ crystal growth rate measurement, surface roughness assessment of coated mirrors, and temperature variations caused by laser heating. For the measurement of temperature changes, the fluorescence ratio method, fluorescence lifetime measurement, Michelson interferometer, and Mach-Zehnder interferometer techniques are given in detail. It is discussed how to utilise a Mach-Zehnder interferometer to track changes in solution refractive index or concentration. For some of the measurements, a full error analysis is provided.

Author (S) Details

B. Rami Reddy
Alabama A&M University, Department of Physics, P.O. Box 1268, Normal, AL 35762, USA.

View Book :- https://stm.bookpi.org/CASTR-V11/article/view/2455