What type of waves does spectral analysis use to produce stress waves in timber members?

Spectral analysis utilizes acoustic waves to produce stress waves in timber members. Acoustic waves are sound waves that travel through materials, including solids like timber, and are used in various non-destructive testing methods. By employing acoustic waves, inspectors can assess the integrity and structural condition of timber by analyzing the characteristics of the waves as they reflect off or pass through different areas of the material. This technique allows for the detection of flaws, defects, or changes in density within the timber, vital for ensuring safety and reliability in engineering applications.

Other types of waves, such as X-ray, magnetic, or electromagnetic waves, are not typically employed in this context for evaluating timber members through spectral analysis. X-ray waves are more suited for imaging and internal inspection of materials, while magnetic and electromagnetic waves are generally employed in different contexts or materials. Therefore, acoustic waves are the correct choice for this application in the analysis of timber members.