Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Peter R. Robichaud; Roger D. Hungerford; David S. Gasvoda
    Date: 1999
    Source: U.S. Patent 5,920,195. July 6. Arlington, VA : U.S. Patent and Trademark Office. 9 p
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.5 MB)

    Description

    An apparatus and method for the moisture content measurement of compressible materials using pressure to firmly hold surface probes against the marerial to be measured. The apparatus uses moisture measurement circuitry employed in frequency domain impedance or time domain reflectometry devices to obtain moisture content readings from materials. These moisture content readings are based on the apparent dielectric constant of the measured material. Subsurface air voids or gaps found in loose layered materials undesirably influence moisture measurement readings by reducing the apparent die1ectric constant of the measured material. Pressure is supplied through the apparatus to the material in the proximity of the surface probes, thereby reducing air voids to enhance measurement accuracy. The apparatus and method are especially useful for compressible organic materials such as forest duff, hay and soil.

    Publication Notes

    • You may send email to rmrspubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Robichaud, Peter R.; Hungerford, Roger D.; Gasvoda, David S. 1999. Apparatus and method for the measurement of forest duff moisture content. U.S. Patent 5,920,195. July 6. Arlington, VA : U.S. Patent and Trademark Office. 9 p

    Keywords

    duff moisture content, forest litter, measurement, apparatus, probes

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page