Apparatus for measuring a percentage of moisture and weighing of a sheet-like object
OwnerShinichi Sasakiinventor
Life of this patent
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Abstract
An apparatus for measuring the percentage of moisture content and weight of a sheet-like object has a pair of metal boxy sections for providing a cavity resonator with openings, defining a gap interposed therebetween. In measurement, the sheet-like object is inserted in the gap. The percentage of moisture content of the sheet-like object is measured by detecting the variable resonant voltage of a microwave signal introduced into the cavity resonator. Weighing of the sheet-like object is measured detecting the variable resonant frequency of the microwave signal introduced.
Claims10
Apparatus for measuring the moisture content and weight of a sheet-like object comprising:
- (a) a single cavity resonator having a pair of metal boxy sections with openings arranged spaced from and facing each other thereby providing a gap therebetween for insertion of said sheet-like object,
- (b) means for generating microwave signals,
- (c) means for coupling said microwave signals to one of said metal boxy sections,
- (d) a microwave detector,
- (e) means for coupling microwave signals from the other of said metal boxy sections to the detector, said coupled microwave signals being attenuated and shifted in frequency at a resonance condition of said cavity resonator when said sheet-like object is inserted within said gap,
- (f) said detector generating resonance signals upon detection of a resonance condition, and
- (g) circuit means connected to said detector for receiving said resonance signals, said circuit means comprising
- (1) means for detecting the amount of attenuation of said resonance signals for substantially determining the moisture content of said sheet-like object, and
- (2) means for detecting the resonance frequency of said resonance signals for determining the weight of said sheet like object.
Dependencies are inferred from the claim text.