General Schemes of Ultrasound-Based Spectroscopic Instruments

GENERAL SCHEMES OF ULTRASOUND-BASED SPECTROSCOPIC INSTRUMENTS 

Laboratory-made instruments for ultrasound-based measurements 

The most recent US-based measurement methodologies are based on laser sources and are of two general types, namely (a) all-laser approaches, where both US generation and detection are laser based and (b) half-laser approaches, where laser light is used either for generation or detection of US, but not both. 

Laser-ultrasound resonance (LUR) for solid analysis. A prototype of an instrument that can be used on-line as shown by its installation at an inspection line in Cleveland [95] is described as an example of LUR for solid analysis. 

Brillouin scattering spectroscopy. The present interest in this acoustic-optical technique and the use of laser sources to generate both types of energy warrant detailed description of the measuring instrument. 

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