Protocol  
Chapter II
Slow Light / 522928.03N/ 132444.50"E

The following  protocols the work:

No Title (Ultrasonic Fossil)


Year: 2015
Apparatus: objects
Dimensions: each sheet measures 2.00 x 1.00 m  
Material: Aluminium, coins, wrist-watches, hoop earrings, belts, keys, nails, plastic coated fabric, zips, hooks and eyes

Setup:

Mechanical vibrations that can be interpreted as sound can travel through all forms of matter: gasses, liquids, solid and plasma. The matter that supports the sound is called the medium.  

All objects undergo an ultrasonic testing procedure, in which ultrasonic waves are transmitted through the material. Waves have various frequencies and travel in either longitudinal or transversal directions. By analyzing the sound velocity or the reaction of the material to propagation of ultrasonic waves, information about the objects can be obtained. Any changes of material properties may cause alteration of the sound’s propagation inside the materials. Properties affected are: sound velocity (C), sound absorption (∞A) and scattering coefficient (∞s) among others.

Any changes of mechanical features in materials – such as tensile strength, impact strength, elongation and hardness - may lead to an alteration of sound velocity and frequency. Human perception is directly affected by any change in these factors.  


Test:

The test is conducted with equipment for measurement. The equipment includes: electromagnetic acoustic transducer and a couplaint (water or oil).

The ultrasonic transducer is placed upon the surface of the object to be measured. Alterations of the resonance within the material are extracted locally. The receiver gathers the ultrasonic waves reflected from an interface, such as the back wall of the object or from an internal or external irregularity in the object’s geometry or material.  
The test is conducted to examine whether past performance of the material may be witnessed through ultrasonic mapping. The qualities of back wall echoes will be compared.  

Conclusion / Composition:

Sound determines our primary understanding of sculpture. Material properties (density, tensile strength, impact strength, elongation and hardness) determine the object’s sound-proportions.  

The properties of the medium affect the frequencies from the environment and its inhabitants over time.

Terminology / Language:

This protocol makes use of terminology and research findings from mechanical engineering. The knowledge of acoustic qualities leads to a re-phrasing of an object’s sculptural qualities - and underlines its transformative potential as an artefact in time.