Non Destructive Testing

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This laboratory is part of the
Mechanics and Energy Department
It began operations in 2007.
The laboratory is run by
Dr. Margarita Navarrete Montesinos
It is located in building 18
II UNAM. Ciudad Universitaria

SCOPE

Methods and methodologies are developed for the nondestructive characterization of condensed matter (gases, liquids, metals, polymers, ceramics or composites) as a function of temperature or pressure, by means of non-destructive (photoacoustic, thermal and optical) and destructive (impact) techniques, as well as analytical and numerical analysis of photoacoustic and spectroscopy signals.

ACTIVITIES

• Sonoluminescence studies of a single bubble.
• Mechanical characterization of trabecular bone samples from the third lumbar vertebra.
• Experimental and analytical propagation of acoustic waves in cylindrical inner wells.

MAJOR WORKS AND RECENT PROYECTS

• Pulsed photoacoustic spectroscopy applied to the detection of pesticides.
• Luminescence studies by means of a conical bubble collapse.
• Design and manufacture of a luminescent reactor to treat water.

EQUIPMENT

• Nd pulsed laser: YAG of 40 mJ.
• Ar continuous laser.
• He-Ne continuous laser.
• Diode lasers.
• Tektronik 500 MHz oscilloscope 500 MHz.
• LeCroy 1 GHz oscilloscope.
• Hammatsu modules with photomultiplier tubes (185-850 nm).
• Photon counter with two channels.
• Sono chemical reactor of 700 W, 20 Hz
• Opto-acoustic modulator.
• Power meter 250-1060 nm, 10 W
• Mini-spectrophotometer, 400-800 nm.
• Pulse-Echo ultrasound equipment.
• Kit of needle hydrophone amplifier.
• Controlled oven for sample preparation (Tamb-1800 C).
• Oven for sample preparation (Tmax of 120 °C).
• Programmable voltage source.
• Deuterium and xenon lamps.
• Tables for fixing and assembly of optical devices.
• Optics (lenses, mirrors, splitters).