JPS5810132Y2 - Moisture detection device - Google Patents
Moisture detection deviceInfo
- Publication number
- JPS5810132Y2 JPS5810132Y2 JP1976178445U JP17844576U JPS5810132Y2 JP S5810132 Y2 JPS5810132 Y2 JP S5810132Y2 JP 1976178445 U JP1976178445 U JP 1976178445U JP 17844576 U JP17844576 U JP 17844576U JP S5810132 Y2 JPS5810132 Y2 JP S5810132Y2
- Authority
- JP
- Japan
- Prior art keywords
- detection device
- microwave
- moisture detection
- moisture
- sensitivity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【考案の詳細な説明】
本考案は水のマイクロ波吸収現象を利用した水分検知装
置に関する。[Detailed Description of the Invention] The present invention relates to a moisture detection device that utilizes the microwave absorption phenomenon of water.
穀類、木材、布９紙あるいは加工食品などではその水分
含有率を知ることが製造、乾燥、貯蔵等の処理条件を定
めるうえで重要である。Knowing the moisture content of grains, wood, cloth9 paper, processed foods, etc. is important in determining processing conditions such as manufacturing, drying, and storage.
そしてこれらの物体のなかには、それ自体が移動または
流動している状態で水分含有率を検知したいという要望
が強い。There is a strong desire to detect the moisture content of these objects while they are moving or flowing.
このような要望を満たす水分検知装置を実現するために
、本考案者らは、被乾燥物と接触せしめたマイクロスト
リップ構造の導波素子の一端からマイクロ波を伝送せし
めて他端でマイクロ波電力を検出し、その減衰から含水
率を求めるマイクロ波の水分検知装置を、特願昭５１−
１２５３０号明細書で既に提案した。In order to realize a moisture detection device that satisfies these demands, the inventors of the present invention transmitted microwaves from one end of a waveguide element with a microstrip structure that was brought into contact with the object to be dried, and transmitted microwave power from the other end. A patent application was filed in 1972 for a microwave moisture detection device that detects moisture content and determines the moisture content from its attenuation.
This was already proposed in the specification of No. 12530.
上記水分検知装置はその断面が、第１図に示されるよう
になっている。The cross section of the above-mentioned moisture detection device is shown in FIG.
同図においてマイクロ波発振器１で発生されたマイクロ
波電力はアイソレータ２、同軸構造マイクロ波入力線３
を経て、誘電体基板４、ス） ＩＪツブ線路５および接
地導体６よりなるマイクロストリップ構造導波素子に導
かれる。In the figure, the microwave power generated by the microwave oscillator 1 is transferred to the isolator 2 and the coaxial structure microwave input line 3.
The light is then guided to a microstrip structure waveguide element consisting of a dielectric substrate 4, an IJ tube line 5 and a ground conductor 6.
ストリップ線路５と接触する被測定物７によって減衰さ
れたマイクロ波電力は、同軸構造マイクロ波出力線８に
よってマイクロ波検波器９へ導かれて直流電圧に変換さ
れ、低域通過フィルタ１０を経て含水率信号として取り
出される。The microwave power attenuated by the object to be measured 7 in contact with the strip line 5 is guided to a microwave detector 9 by a coaxial microwave output line 8, where it is converted into a DC voltage, passed through a low-pass filter 10, and then is converted into a DC voltage. It is extracted as a rate signal.
本考案は感度の向上を図るためになされたもので、スト
リップ線路の形状を選定することにより高感度の水分検
知装置を得ることを目的とする。The present invention was made to improve sensitivity, and the purpose is to obtain a highly sensitive moisture detection device by selecting the shape of the strip line.
以下本考案を図面を用いて実施例ならびにその比較例に
つき説明する。The present invention will be described below with reference to the drawings and examples and comparative examples thereof.
本考案者らは、実線の結果導波素子のスｌ−ＩＪツブ線
路の形状が水分の検出性能と密接な関係を有するという
事実を見出した。As a result of the solid line, the inventors of the present invention discovered that the shape of the sl-IJ tube line of the waveguide element has a close relationship with the moisture detection performance.
ストリップ線路形状を第２図ａ−ｄに示す。The stripline configuration is shown in Figures 2a-d.
同図ａは直線状ストリップ線路であり、水分の変化に対
するマイクロ波電力の減衰の変化は比較的少く、広範囲
な水分の測定に有利で、かつ水分に対する感度がストリ
ップ線上で均一であるという特徴がある。Figure a shows a straight strip line, which has the characteristics that the attenuation of the microwave power changes relatively little with changes in moisture, is advantageous for measuring moisture over a wide range, and the sensitivity to moisture is uniform on the strip line. be.
同図すの円弧状ストリップ線路には、水分に対する感度
が直線状ストリップ線路（同図ａ）よりも大きく、かつ
感度がストリップ線上で均一であるという特徴があり、
比較的狭い範囲で高精度に測定する場合に有利になる。The arc-shaped strip line shown in the figure has a characteristic that its sensitivity to moisture is greater than that of the straight strip line (a), and the sensitivity is uniform on the strip line.
This is advantageous when measuring with high precision in a relatively narrow range.
同図Ｃおよびｄは、それぞれ１つおよび２つの円弧を直
線で結んだものであり、円弧の半径の大きさや直線部分
の長さの設計によって感度が選択できるので、設計の自
由度が大きいという有利さがある。Figures C and d in the same figure are one and two arcs connected by a straight line, respectively, and the sensitivity can be selected by designing the radius of the arc and the length of the straight part, so there is a large degree of freedom in design. There is an advantage.
ただしこれらの形状の場合は、ストリップ線路上で感度
は均一でなく、円弧部で高く直線部で低くなる。However, in the case of these shapes, the sensitivity is not uniform on the strip line, being high in arcuate parts and low in straight parts.
第２図す、Ｃおよびｄの場合、円弧の半径を伝播波長λ
８の士以下にすると、第３図に示すように円弧の部分で
不要な反射が起きてマイクロ波電力の減衰が大きくなり
、水分検知装置の感度が低下する。In Figure 2, for C and d, the radius of the circular arc is the propagation wavelength λ
If it is less than 8, as shown in FIG. 3, unnecessary reflection occurs at the circular arc portion, the attenuation of the microwave power increases, and the sensitivity of the moisture detection device decreases.
他方半径を伝播波長λ８の３波長より大とすると水分検
出の感度が直径にほぼ近くなる。On the other hand, if the radius is made larger than three wavelengths of the propagation wavelength λ8, the sensitivity of moisture detection becomes almost the same as the diameter.
ストリップ線路を直線状とした場合、上述から明らかな
ように、感度があまり高くなく、また広い占有面積を必
要とする。As is clear from the above, when the strip line is straight, the sensitivity is not very high and it requires a large area.
したがって、占有面積をあまり必要とせず、かつ高い感
度のストリップ線路を得るためには、第３図から明らか
なように、半径が伝播波長の＋〜３倍の範囲内の寸法の
円弧部を設ければよい。Therefore, in order to obtain a strip line that does not require much occupied area and has high sensitivity, as is clear from FIG. That's fine.
以上説明したように本考案によれば、導波素子のストリ
ップ線路が伝播するマイクロ波の波長の±〜３倍の半径
の円弧部を有するため、小型で高い感度の水分検知装置
を得ることができる。As explained above, according to the present invention, since the strip line of the waveguide element has an arcuate portion with a radius of ±~3 times the wavelength of the propagating microwave, it is possible to obtain a compact and highly sensitive moisture detection device. can.
第１図は本考案の水分検知装置の一実施構成例を示す断
面図、第２図ａは比較例としてのストリップ線路の平面
パターン図、同図ｂ−ｄは実施例のストリップ線路の各
平面パターン図、第３図はストリップ線路の感度特性を
示す図である。
１・・・・・・マイクロ波発振器、２・・・・・・アイ
ソレータ、３・・・・・・同軸構造マイクロ波入力線、
４・・・・・・誘電体基板、５・・・・・・ストリップ
線路、６・・・・・・同軸構造マイクロ波出力線、９・
・・・・・マイクロ波検波器、１０・・・・・・低域通
過フィルタ。FIG. 1 is a cross-sectional view showing an example of the implementation of the moisture detection device of the present invention, FIG. The pattern diagram and FIG. 3 are diagrams showing the sensitivity characteristics of the strip line. 1... Microwave oscillator, 2... Isolator, 3... Coaxial structure microwave input line,
4... Dielectric substrate, 5... Strip line, 6... Coaxial structure microwave output line, 9...
...Microwave detector, 10...Low pass filter.
Claims (1)
ロス）−１Ｊツブ構造の導波素子で結合してなり、前記
導波素子表面に接触する被測定物の含水率を測定する水
分検知装置において、前記導波素子のス） ＩＪツブ線
路は伝播するマイクロ波の波長の８〜３倍の半径の円弧
部を有することを特徴とする水分検知装置。In a moisture detection device, which comprises a microwave generation means and a microwave detection means coupled by a waveguide element having a micros-1J tube structure, and measures the moisture content of a measured object that is in contact with the surface of the waveguide element. , A moisture detection device characterized in that the IJ tube line of the waveguide element has an arcuate portion with a radius of 8 to 3 times the wavelength of the propagating microwave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976178445U JPS5810132Y2 (en) | 1976-12-28 | 1976-12-28 | Moisture detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976178445U JPS5810132Y2 (en) | 1976-12-28 | 1976-12-28 | Moisture detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5394176U JPS5394176U (en) | 1978-08-01 |
| JPS5810132Y2 true JPS5810132Y2 (en) | 1983-02-24 |
Family
ID=28785673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1976178445U Expired JPS5810132Y2 (en) | 1976-12-28 | 1976-12-28 | Moisture detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5810132Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4991497A (en) * | 1972-12-19 | 1974-08-31 | ||
| JPS5081378A (en) * | 1973-11-19 | 1975-07-02 |
-
1976
- 1976-12-28 JP JP1976178445U patent/JPS5810132Y2/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4991497A (en) * | 1972-12-19 | 1974-08-31 | ||
| JPS5081378A (en) * | 1973-11-19 | 1975-07-02 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5394176U (en) | 1978-08-01 |
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