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JP6655829B2 - Moisture meter - Google Patents

Moisture meter Download PDF

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Publication number
JP6655829B2
JP6655829B2 JP2014263419A JP2014263419A JP6655829B2 JP 6655829 B2 JP6655829 B2 JP 6655829B2 JP 2014263419 A JP2014263419 A JP 2014263419A JP 2014263419 A JP2014263419 A JP 2014263419A JP 6655829 B2 JP6655829 B2 JP 6655829B2
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Japan
Prior art keywords
receiving
antenna
radio wave
local oscillator
moisture meter
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JP2014263419A
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JP2016109657A (en
Inventor
藤井　義久
義久 藤井
徹志 上保
徹志 上保
禎啓 田村
禎啓 田村
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アルモテック株式会社
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Description

本発明は、壁や天井及び床の中の水分を、電波を使用して測定する装置において、微弱電波で測定する方法に関するものである。  The present invention relates to a method for measuring moisture in a wall, a ceiling, and a floor with a weak radio wave in an apparatus for measuring the moisture in a radio wave.

木材やセメントなどの構成材料で出来た建造物の内部を探査する方法として、ＦＭＣＷレーダーやパルスレーダーのような、電波を壁面に照射して内部に浸透し反射してきた電波の強弱や位相情報から、内部の構造を調べる方法が有る。
この時反射してくる電波の強度や位相は、建造物の水分により異なる為、この変化を水分量として観測する事が出来る。As a method of exploring the inside of a building made of constituent materials such as wood and cement, the strength and phase information of the radio wave that radiates radio waves to the wall surface, penetrates and reflects inside, such as FMCW radar and pulse radar, is used. There is a method of examining the internal structure.
At this time, the intensity and phase of the reflected radio wave vary depending on the water content of the building, so that this change can be observed as the water content.

この様な電波を使用する方法は、他の通信に妨害を与えない様にする為使用出来る周波数の範囲が電波法で限られており、この制約により１ｍ以内の近距離を高い分解能で測定する事が出来ず、比較的遠くの物体を検知する事しか出来なかった。  In the method using such radio waves, the range of frequencies that can be used is limited by the Radio Law in order to prevent interference with other communications. Due to this restriction, short distances within 1 m are measured with high resolution I couldn't do anything and could only detect relatively distant objects.

距離分解能を上げるため、使用する周波数の幅を１０ＧＨｚまで広げ距離分解能を１５ｍｍまで小さくした事、他の通信に障害を与えない様に、その電波を高速で拡散して出力電力を弱めた事、アンプの逆方向アイソレーションを利用して、受信アンプから電波を出力する事により、更に微弱まで弱めた事と同時に、受信アンプから効率よく受信信号を増幅して取り出す事。  In order to increase the distance resolution, the width of the frequency used was increased to 10 GHz, and the distance resolution was reduced to 15 mm. By using the reverse isolation of the amplifier to output radio waves from the receiving amplifier, the signal is further weakened and, at the same time, the received signal is efficiently amplified and extracted from the receiving amplifier.

送受のアンテナを一つに出来るので測定箇所を小さくできる。出力電波が微弱になる為使用する周波数に制限が無く、高い距離分解能が出せる。  Since a single transmitting and receiving antenna can be used, the measurement location can be reduced. Since the output radio wave is weak, there is no limit to the frequency used, and a high distance resolution can be obtained.

本発明のブロック図である。It is a block diagram of the present invention.

以下、発明の実施をする為の形態について説明する。
ＶＣＯ（１）に、発振周波数を１０ＧＨｚ〜２０ＧＨｚで発振するための三角波発生器（２）を接続して、周波数を可変させた送信電波を、高域の跳ね上がりを防ぐ為のローパスフイルタ（４）を通して受信アンプ（３）の出力側に入力し、受信アンプ入力側から漏れて出てきた送信電波を、アンテナ（５）より被測定面に放射する。
被測定面内部より反射してきた電波をアンテナ（５）で受信し、受信アンプ（３）で増幅した受信電波とＶＣＯ（１）からの送信電波との周波数差を検波器（６）で検波し定在波を取り出す。
検波して取り出した低周波電圧をＣＰＵ（７）でその大きさや位相情報から内部の構造や湿度などを計算処理し、表示器（８）で表示する。Hereinafter, embodiments for carrying out the invention will be described.
A VCO (1) is connected to a triangular wave generator (2) for oscillating at an oscillation frequency of 10 GHz to 20 GHz, and a low-pass filter (4) for preventing a transmission radio wave whose frequency is varied from rising in a high frequency range. The transmission radio wave leaked out from the input side of the receiving amplifier is radiated from the antenna (5) to the surface to be measured.
The radio wave reflected from the inside of the surface to be measured is received by the antenna (5), and the frequency difference between the received radio wave amplified by the receiving amplifier (3) and the transmitted radio wave from the VCO (1) is detected by the detector (6). Take out the standing wave.
The CPU (7) calculates the internal structure, the humidity, and the like based on the magnitude and phase information of the detected low-frequency voltage, and displays the low-frequency voltage on the display (8).

（１） ＶＣＯ
（２） 三角波発生器
（３） 受信アンプ
（４） ローパスフイルタ
（５） アンテナ
（６） 検波器
（７） ＣＰＵ
（８） 表示器(1) VCO
(2) Triangular wave generator (3) Receiver amplifier (4) Low-pass filter (5) Antenna (6) Detector (7) CPU
(8) Display

Claims (2)

電波を対象物に向けて送信し、対象物からの反射波を受信し、その受信信号を解析する事によって、対象物の内部構造あるいは水分（湿度）を測定する装置であって、反射波を受信するための受信部が少なくとも、局部発振器とアンテナを備えており、前記局部発振器の出力が、受信部を逆伝送して前記アンテナから放射される信号を送信波として利用し、送信専用の回路及び経路を持たない事を特徴とする測定装置。A device that measures the internal structure or moisture (humidity) of an object by transmitting radio waves toward the object, receiving the reflected wave from the object, and analyzing the received signal. A receiving unit for receiving at least includes a local oscillator and an antenna, and an output of the local oscillator uses a signal radiated from the antenna by transmitting the receiving unit in a reverse manner as a transmission wave, and is a circuit dedicated to transmission. And a measuring device characterized by having no path. 対象物が持つ水分を測定するための信号解析部を持つ事を特徴とする、請求項１の装置。  The apparatus according to claim 1, further comprising a signal analysis unit for measuring moisture contained in the object.
JP2014263419A 2014-12-08 2014-12-08 Moisture meter Active JP6655829B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014263419A JP6655829B2 (en) 2014-12-08 2014-12-08 Moisture meter

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Application Number Priority Date Filing Date Title
JP2014263419A JP6655829B2 (en) 2014-12-08 2014-12-08 Moisture meter

Publications (2)

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JP2016109657A JP2016109657A (en) 2016-06-20
JP6655829B2 true JP6655829B2 (en) 2020-02-26

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200341133A1 (en) * 2019-04-01 2020-10-29 Richwave Technology Corp. Methods, circuits, and apparatus for motion detection, doppler shift detection, and positioning by self-envelope modulation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5272593A (en) * 1975-12-15 1977-06-17 Toshiba Corp Doppler radar type proximity alarm
JP4293194B2 (en) * 2005-09-02 2009-07-08 財団法人雑賀技術研究所 Distance measuring device and distance measuring method
US7920090B2 (en) * 2006-04-28 2011-04-05 Infineon Technologies Ag Radar system
JP4781382B2 (en) * 2008-04-02 2011-09-28 三菱電機株式会社 Pulse Doppler radar device

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