Recent techniques of ultrasonic spectroscopy.

Ultrasonic spectroscopy for material analysis. Recent advances

al’s properties and acoustical characteristics have been studied for a long time and ultrasonic techniques have been used in non-destructive testing and imaging for decades. Ultrasound as an analytical tool has revolutionised diagnostics in medicine, but the application of ultrasound to material’s analyses has been held back by problems with ultrasonic design, electronics, sample handling, comp...

Resonance Ultrasonic Spectroscopy of a Nanofibrous Composite and Studying the Effect of Surface/Interface

Resonances are intrinsic characteristics of an elastic object, which are completely independent of the source of excitation. The appropriate utilization of the information contained within the resonance spectra and the identification of the resonance frequencies of the object can be used as a potent tool for material characterization. In this paper, a new mathematical model for the wave diffrac...

Investigating Ultrasonic Diffraction Grating Spectroscopy and Reflection Techniques for Characterizing Slurry Properties

Bond Strength Measurements by Ultrasonic Spectroscopy

The go~l of this project has be~n to discover techniques for predicting the strength of a metal-tometal adhes1ve bond from nondestruct1ye me1surements on the completed structure. Both the cohesive strength of the adhesive material itself and the adhesive strength of the metal-to-adhesive interface must be determined separately. In previous phases of the program, it w~s demonstrated that the Fou...

Recent advances of laser-spectroscopy-based techniques for applications in breath analysis.

Laser absorption spectroscopy (LAS) in the mid-infrared region offers a promising new effective technique for the quantitative analysis of trace gases in human breath. LAS enables sensitive, selective detection, quantification and monitoring in real time, of gases present in breath. This review summarizes some of the recent advances in LAS based on semiconductor lasers and optical detection tec...