Abstract
A low-cost impedance spectrometer prototype was developed for the
analysis of wood transverse moisture gradient.The measurement of electrical
impedance spectrum is based on a sine wave analysis using frequencies below 5
MHz.The equipment consists of a portable PC with an accumulator and
electronics connected to a hand-held probe with coaxial and power cables.The
equipment can be transferred easily in a small case.Because of the
accumulators, no external electricity is needed, and hence, field measurements
can be performed.In the measurement, parallel flat electrodes are pressed
against the wood specimen.The method is based on modelling the electrical
impedance of wood at and below the surface and on using model parameters to
estimate the moisture gradient.The equipment and the method have been tested
with many types of uniform, desorption and adsorption gradients.Lumber,
pulpwood and log specimens of spruce, pine and birch have been used in the
tests.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of 12th International Symposium on Nondestructive Testing of Wood |
| Place of Publication | Sopron |
| Pages | 307 - 316 |
| Publication status | Published - 2000 |
| MoE publication type | A4 Article in a conference publication |
| Event | 12th International Symposium on Nondestructive Testing of Wood - Sopron, Hungary Duration: 13 Sept 2000 → 15 Sept 2000 |
Conference
| Conference | 12th International Symposium on Nondestructive Testing of Wood |
|---|---|
| Country/Territory | Hungary |
| City | Sopron |
| Period | 13/09/00 → 15/09/00 |
Keywords
- wood
- timber
- testing
- analysis
- properties
- moisture
- gradients
- spectrometers
- impedance
- modelling
- absorption
- desorption