The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 1985
Filed:
Dec. 22, 1983
Lien C Yang, La Canada, CA (US);
Abstract
Instrumentation for sensing moisture content of material using a transient thermal pulse is comprised of a sensing probe (12) having a sensing element (14) in the form of a ribbon excited by a constant current pulse from a source (16) to increase the temperature, and therefore the resistance, of the ribbon linearly. Moisture in web material (10) will limit the increase of temperature during the pulse in proportion to the moisture content. This increase in temperature produces a proportional increase in resistivity which is measured with a Wheatstone bridge (R.sub.1, R.sub.2, R.sub.3, 14) as a change in voltage displayed by a measurement display unit (20). The probe (12) is glued in a shallow groove of a Lucite bar (15c) and connected to copper pins (15a, 15b) embedded in the bar. A cylindrical Lucite block (21) may be used to hold the sensing element (14) connected to axial pins (22a, 22b) in order for the probe to roll and thus reduce its wear.