JPH0882597A - Moisture meter - Google Patents

Abstract

PURPOSE: To discriminate a kind regardless of the change of material quality to be measured and to accurately measure moisture. CONSTITUTION: The light from a light source 1 is projected on an object 3 to be measured by a projection lens 4 and transmitted light or reflected light is incident on a detection element 6 through the filters 51, 52 having a comparison wavelength and a measuring wavelength not affected by moisture provided to a rotary sector 5 by a condensing lens 4. The output signals thereof are amplified by an amplifier 7 to be separated into the signals R1, S, R2 corresponding to respective wavelengths by a signal separating and rectifying device 8 to be taken out by a synchronizing signal generator 9 and transmissivity or reflectivity is calculated by an operation means 10 and a kind is calculated therefrom and moisture is operated.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、赤外線を利用して被
測定対象の水分率を測定する水分計に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture meter for measuring the moisture content of an object to be measured using infrared rays.

【０００２】[0002]

【従来の技術】従来、赤外線を利用して水分率を測定す
るには、水分の吸収波長帯における被測定対象からの反
射光ないし透過光の測定信号と、水分の非吸収帯におけ
る反射光ないし透過光の１または２の比較信号との比率
信号から被測定対象の水分率を求める２色または３色赤
外線水分計が知られている。2. Description of the Related Art Conventionally, in order to measure the moisture content using infrared rays, the measurement signal of the reflected light or transmitted light from the object to be measured in the absorption wavelength band of moisture and the reflected light in the non-absorption band of moisture or There is known a two-color or three-color infrared moisture meter that obtains the moisture content of an object to be measured from a ratio signal of transmitted light to one or two comparison signals.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、紙等の
被測定対象物の品種が異なると出力特性が変化してしま
う問題点がある。この原因の１つとして、材質等が変化
するため、分光特性が変化し、出力特性が変化するため
であると考えられ、この影響を取り除くため、出願人
は、特公昭６１−６１６２３号公報で補正方式を提案し
ているが、十分ではない面があった。However, there is a problem that the output characteristic changes when the kind of the object to be measured such as paper is different. It is considered that one of the causes is that the spectral characteristics and the output characteristics are changed due to the change of the material and the like, and in order to remove this influence, the applicant has disclosed in Japanese Patent Publication No. 61-61623. We have proposed a correction method, but there were aspects that were not sufficient.

【０００４】この発明の目的は、以上の点に鑑み、被測
定対象の材質等の変化があっても、高精度の測定が可能
な水分計を提供することである。In view of the above points, an object of the present invention is to provide a moisture meter capable of highly accurate measurement even if the material or the like of the object to be measured changes.

【０００５】[0005]

【課題を解決するための手段】この発明は、水分の吸収
波長帯に測定波長帯を設け、この波長帯における被測定
対象からの透過光ないし反射光を第１の信号とし、前記
水分の吸収波長帯以外に少なくとも１つの波長帯を設
け、この波長帯における被測定対象からの透過光ないし
反射光を第２の信号とし、反射率または透過率を求める
ための波長帯における被測定対象からの透過光ない反射
光を第３の信号とし、この第３の信号から被測定対象の
透過率または反射率を求め、この透過率または反射率か
ら被測定対象の種別を判別し、この種別に基き前記第１
の信号と第２の信号の比率から水分率を演算するように
した水分計である。SUMMARY OF THE INVENTION According to the present invention, a measurement wavelength band is provided in an absorption wavelength band of water, and transmitted light or reflected light from an object to be measured in this wavelength band is used as a first signal to absorb the water. At least one wavelength band other than the wavelength band is provided, and transmitted light or reflected light from the measurement target in this wavelength band is used as the second signal, and the reflectance or the transmittance from the measurement target in the wavelength band for obtaining the transmittance is determined. Reflected light that is not transmitted light is used as a third signal, the transmittance or reflectance of the measured object is obtained from this third signal, the type of the measured object is determined from this transmittance or reflectance, and based on this type. The first
The moisture meter is configured to calculate the moisture content from the ratio of the signal of 1 to the second signal.

【０００６】[0006]

【実施例】図１は、この発明を透過式の赤外線水分計に
適用した一実施例を示す構成説明図である。１は投光用
の光源で、この光源１の光は投光用レンズ２より被測定
対象３に投光され、その透過光または反射光は集光レン
ズ４により回転セクタ５に設けられたそれぞれ透過波長
λ１、λ２、λ３、をもつフィルタ５１、５２、５３を
介してＰｂＳ、ＰｂＳｅ、Ｇｅ、サーミスタボロメー
タ、ＩｎＧａＡｓ等よりなる検出素子６に入射される。
この検出素子６の検出信号は増幅器７により増幅され、
信号分離・整流器８において、回転セクタ５のフィルタ
５１、５２、５３の上記波長λ１、λ２、λ３に対する
信号Ｒ１、Ｓ、Ｒ２を回転セクタ５に設けられた同期信
号発生器９の同期信号により分離し、整流して取り出
す。この信号Ｒ１、Ｓ、Ｒ２は、マイクロコンピュータ
のような演算手段１０により、以下の所定の判別の演算
を行い、出力端子１１より水分または材質等に関連する
信号を取り出すことができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural explanatory view showing an embodiment in which the present invention is applied to a transmission type infrared moisture meter. Reference numeral 1 denotes a light source for projecting light, and the light from this light source 1 is projected onto an object 3 to be measured by a projecting lens 2, and its transmitted light or reflected light is provided on a rotating sector 5 by a condenser lens 4, respectively. The light enters the detection element 6 made of PbS, PbSe, Ge, thermistor bolometer, InGaAs or the like through the filters 51, 52, 53 having the transmission wavelengths λ1, λ2, λ3.
The detection signal of the detection element 6 is amplified by the amplifier 7,
In the signal separation / rectifier 8, the signals R1, S, R2 corresponding to the wavelengths λ1, λ2, λ3 of the filters 51, 52, 53 of the rotating sector 5 are separated by the synchronizing signal of the synchronizing signal generator 9 provided in the rotating sector 5. Then, rectify and take out. The signals R1, S, R2 can be subjected to the following predetermined determination calculation by a calculation means 10 such as a microcomputer, and a signal related to moisture or material can be taken out from the output terminal 11.

【０００７】つまり、図２を参照して、たとえば水分の
吸収波長帯の第１の波長λ２における被測定対象からの
透過光ないし反射光の第１の信号Ｓと、水分の吸収波長
帯の両側の水分および材質等の影響を受けない第２の波
長λ１および材質等の影響を受ける第３の波長λ３の比
較波長帯における被測定対象からの透過光ないし反射光
の第２、第３の信号Ｒ１、Ｒ２を求める。たとえば第１
の信号Ｓと第２の信号Ｒ１との比率等から水分に関する
出力信号ｅを求め、第３の信号Ｒ２から透過率または反
射率を求める。That is, with reference to FIG. 2, for example, a first signal S of transmitted light or reflected light from the object to be measured at the first wavelength λ2 of the water absorption wavelength band and both sides of the water absorption wavelength band. Second and third signals of transmitted light or reflected light from the object to be measured in the comparative wavelength band of the second wavelength λ1 which is not affected by the water content and material of the Find R1 and R2. For example, the first
The output signal e relating to moisture is obtained from the ratio of the signal S of the above-mentioned S to the second signal R1 and the like, and the transmittance or the reflectance is obtained from the third signal R2.

【０００８】つまり、図３で示すように、ある波長につ
いてみれば、透過率または反射率は、種別により異なる
ので、反射率等の大きさにより種別を判別する。たとえ
ば、粒度が大きければ散乱されやすく反射率は低くな
り、粒度が細かく小さければ、散乱が少ないので反射率
は大きくなり、反射率から粒度が推定できる。That is, as shown in FIG. 3, regarding a certain wavelength, since the transmittance or the reflectance differs depending on the type, the type is discriminated by the magnitude of the reflectance or the like. For example, if the particle size is large, the particles are easily scattered and the reflectance is low. If the particle size is small and small, the reflectance is large because the scattering is small, and the particle size can be estimated from the reflectance.

【０００９】次いで、図４で示すあらかじめ求めた種別
ａ、ｂ、ｃ、…に対応した検量線Ａ、Ｂ、Ｃ、…のうち
の１本、たとえば種別がａであれば検量線Ａを選択して
用いることにより、上記水分に関連する出力信号ｅから
水分率Ｍが求まる。この演算は、演算手段１０で実行さ
れ、出力信号ｅ、反射率信号も出力して利用できる。ま
た、検量線をテーブル化しておき、品種に対応して、出
力信号ｅから水分率Ｍを求めるようにしてもよい。Then, one of the calibration curves A, B, C, ... Corresponding to the previously determined types a, b, c, ... Shown in FIG. 4, for example, if the type is a, the calibration curve A is selected. Then, the water content M is obtained from the output signal e related to the water content. This calculation is executed by the calculation means 10, and the output signal e and the reflectance signal can also be output and used. Alternatively, the calibration curve may be made into a table, and the moisture content M may be obtained from the output signal e corresponding to the product type.

【００１０】ここで、出力信号ｅは、信号ＳとＲの比率
の２色方式の他に、上記２つの信号Ｒ１、Ｒ２の両方を
用いるいわゆる３色方式の水分演算でもよい。また、第
３の信号Ｒ３として所定の性状等に関連する任意の波長
帯λｉにおける被測定対象からの少なくとも１個以上の
１つまたは複数の信号Ｒｉの反射率または透過率を用い
て種別を判別するようにしてもよい。この信号Ｒｉの波
長は赤外域に限定されるものではなく、可視域でも色判
別して種別を判定してもよく、また、バンドパスフイル
タのような広い波長域についてのものでもよい。Here, the output signal e may be a moisture calculation of a so-called three-color method using both of the two signals R1 and R2, in addition to the two-color method of the ratio of the signals S and R. Further, the type is determined as the third signal R3 by using the reflectance or the transmittance of at least one or more signals Ri from the object to be measured in an arbitrary wavelength band λi related to a predetermined property or the like. You may do it. The wavelength of the signal Ri is not limited to the infrared region, and the type may be determined by color discrimination even in the visible region, or may be in a wide wavelength region such as a bandpass filter.

【００１１】図５は反射式の赤外線水分計の一実施例を
示し、光源１の光が集光レンズ２により回転セクタ５の
フィルタ５１、５２、５３を透過してミラーＭ１により
波長λ１、λ２、λ３の光が被測定対象３に投光され、
反射光が凹面鏡Ｍ２により検出素子６に入射される。こ
の検出素子６の出力信号は増幅器７により増幅され、信
号分離・整流器８より信号Ｒ１、Ｓ、Ｒ２が取り出さ
れ、演算手段１０により前述の信号Ｒ２から反射率また
は透過率を求めて種別を判別し種別に対応した検量線等
と信号Ｓ、Ｒ１による出力から出力端子１１より水分信
号等を取り出すことができる。FIG. 5 shows an embodiment of a reflection type infrared moisture meter in which the light from the light source 1 is transmitted through the filters 51, 52 and 53 of the rotating sector 5 by the condenser lens 2 and the wavelengths λ1 and λ2 are transmitted by the mirror M1. , Λ3 light is projected onto the measured object 3,
The reflected light is incident on the detection element 6 by the concave mirror M2. The output signal of the detection element 6 is amplified by the amplifier 7, the signals R1, S and R2 are taken out by the signal separating / rectifying device 8, and the calculating unit 10 obtains the reflectance or the transmittance from the above-mentioned signal R2 to determine the type. Then, the moisture signal or the like can be taken out from the output terminal 11 from the calibration curve or the like corresponding to the type and the output of the signals S and R1.

【００１２】[0012]

【発明の効果】以上述べたように、この発明は、水分の
吸収波長帯における第１の信号の他に第２の信号を用い
て、透過率または反射率を求め、これにより種別を求
め、種別に対応した検量線から被測定対象の水分率を測
定するようにした水分計である。As described above, according to the present invention, the transmittance or reflectance is obtained by using the second signal in addition to the first signal in the absorption wavelength band of water, and the type is obtained by this. It is a moisture meter adapted to measure the moisture content of an object to be measured from a calibration curve corresponding to the type.

【００１３】従って、紙等の被測定対象の坪量等の材質
が変化したとしても、品種が判別でき、その最適な検量
線により高精度の正しい水分測定信号が得られ、紙の品
種の変化に自動的に対応でき、大幅な工数低減が図れ
る。また坪量等の材質に関する信号も得られるので、こ
れを利用して、多品種少量生産工程において、完全に近
い自動化が図れ、常に高品質の製品が生産でき、実用的
効果はきわめて大きい。Therefore, even if the material such as the grammage of the object to be measured such as paper changes, the type can be discriminated, and a highly accurate correct moisture measurement signal can be obtained by the optimum calibration curve, and the type of paper can be changed. It is possible to automatically respond to, and it is possible to significantly reduce the man-hours. In addition, since signals related to materials such as basis weight can be obtained, this can be used to achieve near-complete automation in a high-mix low-volume production process, consistently produce high-quality products, and the practical effect is extremely large.

【図面の簡単な説明】[Brief description of drawings]

【図１】この発明の一実施例を示す構成説明図である。FIG. 1 is a structural explanatory view showing an embodiment of the present invention.

【図２】この発明に係る波長と出力の関係を示す説明図
である。FIG. 2 is an explanatory diagram showing a relationship between wavelength and output according to the present invention.

【図３】この発明の一実施例を示す関係図である。FIG. 3 is a relationship diagram showing an embodiment of the present invention.

【図４】この発明の一実施例を示す関係図である。FIG. 4 is a relationship diagram showing an embodiment of the present invention.

【図５】この発明の一実施例を示す構成説明図である。FIG. 5 is a structural explanatory view showing an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１ 光源 ３ 被測定対象 ５ 回転セクタ ５１、５２、５３ フイルタ ６ 検出素子 ７ 増幅器 ８ 信号・分離整流器 ９ 同期信号発生器 １０ 演算手段 1 Light Source 3 Object to be Measured 5 Rotating Sectors 51, 52, 53 Filter 6 Detecting Element 7 Amplifier 8 Signal / Separation Rectifier 9 Synchronous Signal Generator 10 Computing Means

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】水分の吸収波長帯に測定波長帯を設け、こ
の波長帯における被測定対象からの透過光ないし反射光
を第１の信号とし、前記水分の吸収波長帯以外に少なく
とも１つの波長帯を設け、この波長帯における被測定対
象からの透過光ないし反射光を第２の信号とし、反射率
または透過率を求めるための波長帯における被測定対象
からの透過光ない反射光を第３の信号とし、この第３の
信号から被測定対象の透過率または反射率を求め、この
透過率または反射率から被測定対象の種別を判別し、こ
の種別に基き前記第１の信号と第２の信号の比率から水
分率を演算することを特徴とする水分計。1. A measurement wavelength band is provided in a water absorption wavelength band, and transmitted light or reflected light from an object to be measured in this wavelength band is used as a first signal, and at least one wavelength other than the water absorption wavelength band. A band is provided, and transmitted light or reflected light from the object to be measured in this wavelength band is used as a second signal, and reflected light that is not transmitted light from the object to be measured in the wavelength band for obtaining reflectance or transmittance is determined as the third signal. Signal, the transmittance or reflectance of the object to be measured is obtained from the third signal, the type of the object to be measured is discriminated from this transmittance or reflectance, and the first signal and the second signal are determined based on this type. A moisture meter characterized in that the moisture content is calculated from the ratio of the signals. 【請求項２】求めた種別に対応した検量線に基き水分率
を演算することを特徴とする請求項１記載の水分計。2. The moisture meter according to claim 1, wherein the moisture content is calculated based on a calibration curve corresponding to the obtained type.