JPS6342357Y2 - - Google Patents
Info
- Publication number
- JPS6342357Y2 JPS6342357Y2 JP1983198257U JP19825783U JPS6342357Y2 JP S6342357 Y2 JPS6342357 Y2 JP S6342357Y2 JP 1983198257 U JP1983198257 U JP 1983198257U JP 19825783 U JP19825783 U JP 19825783U JP S6342357 Y2 JPS6342357 Y2 JP S6342357Y2
- Authority
- JP
- Japan
- Prior art keywords
- microwave
- sheet
- paper
- microwaves
- housing
- 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
- 239000006096 absorbing agent Substances 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 9
- 238000011088 calibration curve Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Electric Ovens (AREA)
Description
【考案の詳細な説明】
〔考案の属する技術分野〕
本考案は、マイクロ波が水の分子と回転共振し
減衰することを測定原理としたマイクロ波水分計
に関し、更に詳しくは、マイクロ波送・受信系を
個々に収納設置する２個の筐体を対峙させたと
き、各筐体の対向面の一部又は全部を他方の筐体
の面に対して傾斜するようにしたマイクロ波水分
計に関する。[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a microwave moisture meter whose measurement principle is that microwaves undergo rotational resonance with water molecules and are attenuated. Relating to a microwave moisture meter in which, when two housings each housing a receiving system are placed facing each other, a part or all of the facing surfaces of each housing are inclined with respect to the surface of the other housing. .
従来から、例えば第１図に示すマイクロ波水分
計が知られている。マイクロ波水分計は、金属製
の筐体１及び２に送・受信系を収納設置して検出
部３０を構成し、該検出部３０を第２図に示すよ
うにＯ形フレーム３１上に設置し、矢印Ａ方向に
流れるシート状の紙２３の幅方向で予め定めた区
間X1とX2間を往復走行させながら測定を行う構
成となつている。筐体１は、マイクロ波発振器
３、アイソレータ４及び送信アンテナ５から成る
送信系６と、受信アンテナ７、検出器（シヨツト
キーダイオード）８及び信号増幅・演算処理部９
から成る受信系１０とを有する。受信系１０の信
号増幅・演算処理部９は、所定の寸法、例えば、
155mm×280mmに截断した測定銘柄を用いて求めた
検量線を記憶し、これに基づく処理を行うように
なつている。一方、筐体２は、同軸ケ−ブル１１
で接続する受信アンテナ１２及び送信アンテナ１
３から成る送・受信系１４を有する。各筐体にお
けるマイクロ波の送・受信口１５乃至１８は、薄
い膜、例えばポリエチレンテレフタレート膜１９
乃至２２で閉じられている。
2. Description of the Related Art Conventionally, for example, a microwave moisture meter shown in FIG. 1 has been known. In the microwave moisture meter, a transmitting/receiving system is housed and installed in metal casings 1 and 2 to constitute a detection section 30, and the detection section 30 is installed on an O-shaped frame 31 as shown in FIG. The sheet of paper 23 flowing in the direction of arrow A is configured to perform measurements while traveling back and forth between predetermined sections X 1 and X 2 in the width direction. The housing 1 includes a transmission system 6 consisting of a microwave oscillator 3, an isolator 4, and a transmission antenna 5, a reception antenna 7, a detector (Shotkey diode) 8, and a signal amplification/arithmetic processing section 9.
It has a receiving system 10 consisting of. The signal amplification/arithmetic processing section 9 of the reception system 10 has predetermined dimensions, for example,
A calibration curve obtained using a measurement brand cut to 155 mm x 280 mm is stored, and processing is performed based on this. On the other hand, the housing 2 has a coaxial cable 11
Receiving antenna 12 and transmitting antenna 1 connected with
It has a transmitting/receiving system 14 consisting of three components. The microwave transmitting/receiving ports 15 to 18 in each housing are formed using a thin film, for example, a polyethylene terephthalate film 19.
It is closed at 22 to 22.
以上の構成において、マイクロ波水分計は、検
出部３０を区間X1〜X2往復走行させながら測定
を行う。このとき、送信系６から紙２３に向けて
照射するマイクロ波は、送信アンテナ５→紙２３
→受信アンテナ１２→同軸ケ−ブル１１→送信ア
ンテナ１３→紙２３→受信アンテナ７の経路で伝
播され、検出器８で検出される。そして、信号増
幅・演算処理部９は、検出器８による信号を増幅
し、検量線に基づき所定の処理をして水分量信号
ｇ（MW）を出力する。 In the above configuration, the microwave moisture meter performs measurement while causing the detection unit 30 to travel back and forth between sections X 1 to X 2 . At this time, the microwave irradiated from the transmission system 6 toward the paper 23 is transmitted from the transmission antenna 5 to the paper 23.
The signal is propagated along the following path: → receiving antenna 12 → coaxial cable 11 → transmitting antenna 13 → paper 23 → receiving antenna 7, and is detected by detector 8. Then, the signal amplification/arithmetic processing unit 9 amplifies the signal from the detector 8, performs predetermined processing based on the calibration curve, and outputs a water content signal g (MW).
しかし、従来のマイクロ波水分計にあつては、
マイクロ波の伝播経路は、上記伝播経路のように
単純なものだけではなく、筐体１と２の対向面間
や各対向面と紙２３の間を多数回反射したマイク
ロ波も、各受信アンテナに入射する（この現象に
より測定面積が実質的に広くなる）。しかも、そ
の入射量は、筐体１及び２間に占める紙の面積
（紙の大きさ）が広くなるほど多くなる傾向にあ
る。このため、水分量信号ｇ（MW）は、筐体の
対向面内に収まる小さい紙よりもシート状の紙を
被測定体としたときの方が増大する傾向を示す
（一般に、紙が大きくなると、マイクロ波の反射
回数が多くなり感度が向上する）。即ち、測定銘
柄を所定の寸法に截断したものを用いて求めた検
量線と、シート状の紙に基づく信号特性が一致せ
ず、測定誤差を増大する虞れがある。筐体１と２
の対向面を電波吸収体で覆うことも考えられる
が、この方法だけではマイクロ波の多重反射を完
全に防ぐことはできない。 However, with conventional microwave moisture meters,
The propagation path of microwaves is not only simple as the above propagation path, but also the microwaves reflected many times between the opposing surfaces of the casings 1 and 2 and between each opposing surface and the paper 23. (this phenomenon substantially increases the measurement area). Moreover, the incident amount tends to increase as the area of paper (size of paper) occupied between the casings 1 and 2 becomes larger. Therefore, the moisture content signal g (MW) tends to increase when a sheet of paper is used as the object to be measured than when a small piece of paper fits within the facing surface of the casing (in general, the larger the paper , the number of microwave reflections increases and sensitivity improves). That is, the calibration curve obtained by cutting the brand to be measured to a predetermined size does not match the signal characteristics based on the sheet of paper, which may increase measurement errors. Housing 1 and 2
It may be possible to cover the facing surface with a radio wave absorber, but this method alone cannot completely prevent multiple reflections of microwaves.
本考案の目的は、前記送信アンテナよりシート
状の被測定体にマイクロ波を照射し、この被測定
体を透過したマイクロ波を前記受信アンテナで受
信する方式のマイクロ波水分計において、前記筐
体の対向面間、或は各対向面と前記被測定体との
間で発生する多重反射マイクロ波の影響を除去す
ることにある。
An object of the present invention is to provide a microwave moisture meter in which microwaves are irradiated from the transmitting antenna to a sheet-shaped object to be measured, and the microwaves transmitted through the object are received by the receiving antenna. The object of the present invention is to eliminate the influence of multiple reflected microwaves generated between opposing surfaces of the object, or between each opposing surface and the object to be measured.
以下、図面を参照し本考案について説明する。
第３図は、本考案の一実施例を示す構成図であつ
て、検出部３０をシート状の紙２３の流れ方向か
らみた構成を示すものである（送・受信アンテナ
５及び１２以外の構成要素は省略されている）。
第５図に付した引用数字で第１図と同一のもの
は、同一意味で用いられているので、ここでの説
明は省略する。この実施例の特徴は、筐体１及び
２が、他方の筐体の対向面に対して傾斜する面２
４及び２５を備えた点にある。対向面２４と２５
は、その開き角θ＝10゜を有し、各表面を電波吸
収体２６で被覆する構成となつている。
The present invention will be described below with reference to the drawings.
FIG. 3 is a configuration diagram showing an embodiment of the present invention, and shows the configuration of the detection unit 30 viewed from the flow direction of the sheet-like paper 23 (configurations other than the transmitting/receiving antennas 5 and 12). elements omitted).
Reference numerals in FIG. 5 that are the same as those in FIG. 1 are used with the same meaning, so their explanation will be omitted here. A feature of this embodiment is that the casings 1 and 2 have a surface 2 that is inclined with respect to the opposing surface of the other casing.
4 and 25. Opposing surfaces 24 and 25
has an opening angle θ=10°, and each surface is covered with a radio wave absorber 26.
以上の構成において、送信アンテナ５から紙２
３に照射すると、マイクロ波のメインビームBn
は、第３図に示すように、紙２３を透過して受信
アンテナ１２に入射する。一方、マイクロ波のサ
イドビームBsは、紙２３と対向面２４、紙２３
と対向面２５、対向面２４と２５との間で反射を
繰返しながら、筐体の外に導かれ、受信アンテナ
１２には入射しない。このため、受信アンテナ１
２への入射量は、メインビームBnの透過部分
（アンテナの開口部に対向する部分）の周辺の広
がりによ影響を受けず、水分量信号ｇ（MW）は、
被測定体の紙の大きさと無関係となる（実質的に
測定面積を小さくする）。従つて、測定銘柄を所
定の大きさに截断したものを用いて求めた検量線
とシート状の紙による信号特性が一致する。 In the above configuration, from the transmitting antenna 5 to the paper 2
3, the main beam of microwaves B n
As shown in FIG. 3, the light passes through the paper 23 and enters the receiving antenna 12. On the other hand, the side beam Bs of the microwave is
The light is guided out of the housing while being repeatedly reflected between the opposite surfaces 25 and 24 and 25, and does not enter the receiving antenna 12. Therefore, receiving antenna 1
The incident amount to 2 is not affected by the spread around the transmitted part of the main beam B n (the part facing the antenna opening), and the water content signal g (MW) is
This is independent of the paper size of the object to be measured (substantially reducing the measurement area). Therefore, the calibration curve obtained by cutting the measured brand into a predetermined size matches the signal characteristics obtained by the sheet-like paper.
第４図は、本考案のマイクロ波水分計における
紙の位置特性を示す図で、縦軸は水分量信号ｇ
（MW）、横軸は筐体間における紙２３の位置Ｌで
ある。特性1は、紙２３の端２３ａを位置X0か
らX0→X1→X2と移動したときの水分量信号ｇ
（MW）をブロツトしたものである。特性1か
ら、本考案のマイクロ波水分計にあつては、２
X0X2の幅の紙と２1 2の幅の紙の中央を位置X2
に合せて設置した場合、紙幅の違いによつて水分
量信号ｇ（MW）が変化しないことが分る。即ち、
位置X0とX1間で反射を繰返すマイクロ波（対向
面と紙、対向面同士における反射波）は、受信ア
ンテナ１２に入射せず、被測定体の大きさの違い
による影響を受けない。 Figure 4 is a diagram showing the positional characteristics of paper in the microwave moisture meter of the present invention, where the vertical axis is the moisture content signal g.
(MW), and the horizontal axis is the position L of the paper 23 between the casings. Characteristic 1 is the moisture content signal g when the edge 23a of the paper 23 is moved from the position X 0 to X 0 →X 1 →X 2
(MW) was blotted. From characteristic 1 , the microwave moisture meter of the present invention has 2.
X 0 X 2 width paper and 2 1 Position the center of the 2 width paper X 2
It can be seen that when installed according to the paper width, the moisture content signal g (MW) does not change depending on the paper width. That is,
Microwaves that are repeatedly reflected between positions X 0 and X 1 (reflected waves between the opposing surfaces and the paper, or between the opposing surfaces) do not enter the receiving antenna 12 and are not affected by the difference in size of the object to be measured.
因みに、特性2は、従来のマイクロ波水分計
（筐体２の対向面を一点鎖線Ｙで示す）における
特性を示す。 Incidentally, characteristic 2 indicates a characteristic in a conventional microwave moisture meter (the opposing surface of the housing 2 is indicated by a dashed line Y).
以上説明した通り、本考案のマイクロ波水分計
によれば、マイクロ波送・受信系を個々に収納設
置する２個の筐体を対峙させたとき、各筐体の対
向面で多重反射されたマイクロ波は電波吸収体で
吸収を受けつつ筐体外に導かれ、受信アンテナに
は入射しないため、サンプル用の小さな紙を用い
て求める検量線とシート状の紙による信号特性の
差を小さくすることができ、測定精度を高めるこ
とができる。しかも、実質的に測定面積（受信ア
ンテナに入射するマイクロ波の透過部分）が小さ
くなるため、シート状の紙端迄充分に測定するこ
とができる。
As explained above, according to the microwave moisture meter of the present invention, when the two housings in which the microwave transmitting/receiving systems are individually housed are placed facing each other, multiple reflections occur on the opposing surfaces of each housing. Microwaves are absorbed by the radio wave absorber and guided out of the housing, and do not enter the receiving antenna. Therefore, the difference between the calibration curve obtained using a small piece of sample paper and the signal characteristics between the sheet of paper and the signal characteristics can be reduced. It is possible to improve measurement accuracy. Moreover, since the measurement area (the portion through which the microwaves incident on the receiving antenna are transmitted) is substantially reduced, it is possible to sufficiently measure even the edges of the sheet-like paper.
第１図及び第２図は、従来例を示す構成図、第
３図は、本考案の一実施例を示す構成図、第４図
は、本考案のマイクロ波水分計による紙端特性を
示す図である。
５，７……受信アンテナ、１２，１３……送信
アンテナ、２４，２５……筐体の対向面（傾斜
面）、２６……電波吸収体。
Figures 1 and 2 are block diagrams showing a conventional example, Figure 3 is a block diagram showing an embodiment of the present invention, and Figure 4 shows paper edge characteristics by the microwave moisture meter of the present invention. It is a diagram. 5, 7... Receiving antenna, 12, 13... Transmitting antenna, 24, 25... Opposing surface (slanted surface) of the housing, 26... Radio wave absorber.
Claims (1)
送信部とマイクロ波受信部とを夫々設けた一対の
筐体を対向配置し、これら筐体を前記シート状の
被測定体の流れ方向と直交する方向に往復走行さ
せ、前記マイクロ波送信部から前記シート状の被
測定体に向けてマイクロ波を照射し、前記シート
状の被測定体を透過したマイクロ波を前記マイク
ロ波受信部で受信し、マイクロ波の吸収に基づき
前記シート状の被測定体中の水分量を測定するマ
イクロ波水分計において、前記一対の筐体の対向
面内において、前記マイクロ波のビーム通路から
筐体が往復走行される側の筐体両側縁に至る部分
に、これら側縁に向つて広がる開き角で傾斜面を
形成し、この傾斜面を電波吸収体で覆つたことを
特徴とするマイクロ波水分計。 A pair of housings sandwiching a sheet-like object to be measured and each having a microwave transmitting section and a microwave receiving section inside thereof are disposed facing each other, and these cases are aligned in the flow direction of the sheet-like object to be measured. The microwave transmitter irradiates the sheet-shaped object with microwaves while reciprocating in orthogonal directions, and the microwaves transmitted through the sheet-like object are received by the microwave receiver. In the microwave moisture meter that measures the amount of moisture in the sheet-like object based on absorption of microwaves, the housing is reciprocated from the microwave beam path within the opposing surfaces of the pair of housings. A microwave moisture meter characterized in that a sloped surface is formed at a portion extending to both side edges of the housing on the traveling side with an opening angle that widens toward these side edges, and the sloped surface is covered with a radio wave absorber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19825783U JPS60106153U (en) | 1983-12-23 | 1983-12-23 | microwave moisture meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19825783U JPS60106153U (en) | 1983-12-23 | 1983-12-23 | microwave moisture meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60106153U JPS60106153U (en) | 1985-07-19 |
| JPS6342357Y2 true JPS6342357Y2 (en) | 1988-11-07 |
Family
ID=30757097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19825783U Granted JPS60106153U (en) | 1983-12-23 | 1983-12-23 | microwave moisture meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60106153U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01145557A (en) * | 1987-12-02 | 1989-06-07 | Nippon Glass Fiber Co Ltd | Detecting apparatus of conductive substance in glass fiber |
| JPH0629866B2 (en) * | 1988-07-07 | 1994-04-20 | カワサキ機工株式会社 | Microwave moisture analyzer |
| JPH0628685Y2 (en) * | 1988-08-08 | 1994-08-03 | カワサキ機工株式会社 | Microwave moisture analyzer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5581751U (en) * | 1978-11-30 | 1980-06-05 |
-
1983
- 1983-12-23 JP JP19825783U patent/JPS60106153U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60106153U (en) | 1985-07-19 |
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