Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
MOISTURE AMOUNT DETECTION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2019/167467
Kind Code:
A1
Abstract:
A moisture amount detection apparatus (1) is provided with: a light source unit (10) that applies, toward an object (2), light flashing at a predetermined frequency; a light reception device (130) that receives reflection light (R) resulting from reflection of the light from the object (2), and outputs an intensity signal according to the intensity of the reflection light (R); a lock-in amplifier (50) that outputs an extraction signal obtained by extracting a signal having a predetermined frequency from the intensity signal; and a determination unit (70) that determines, on the basis of a first threshold and a first signal which is according to the intensity of the reflection light (R) and which has been inputted from the light reception device (130), an abnormality in the first signal. The first threshold is determined on the basis of the difference between an outputtable voltage width (Vmax) within which the light reception device (130) can output the first signal and a maximum output voltage width (ΔVmax) which is the maximum value of the difference between a reference voltage (Vref) predetermined in the light reception device (130) and an output voltage being a signal outputted upon reception of the reflection light (R) at the light reception device (130).

Inventors:
WATABE YOSHIFUMI
HAYASHI MASANORI
BABA TORU
Application Number:
PCT/JP2019/001591
Publication Date:
September 06, 2019
Filing Date:
January 21, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G01N21/3554; H03F1/26; H03F3/38; H03F3/08
Domestic Patent References:
WO2017208765A12017-12-07
Foreign References:
JP2015148600A2015-08-20
JP2002102597A2002-04-09
Other References:
"A Prototype Infrared Reflectance Moisture Meter", JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, vol. 31, no. 1, January 1985 (1985-01-01), pages 67 - 79, XP055634575
ANDREA DE MARCELLIS, ET AL.: "A Fully-Analog Lock-In Amplifier With Automatic Phase Alignment for Accurate Measurements of ppb Gas Concentrations", IEEE SENSORS JOURNAL, vol. 12, no. 5, May 2012 (2012-05-01), pages 1377 - 1383, XP055634583
Attorney, Agent or Firm:
NII, Hiromori et al. (JP)
Download PDF: