JPH07190927A - Concentration measuring apparatus for suspension - Google Patents
Concentration measuring apparatus for suspensionInfo
- Publication number
- JPH07190927A JPH07190927A JP5330471A JP33047193A JPH07190927A JP H07190927 A JPH07190927 A JP H07190927A JP 5330471 A JP5330471 A JP 5330471A JP 33047193 A JP33047193 A JP 33047193A JP H07190927 A JPH07190927 A JP H07190927A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- value
- light
- time
- integral
- 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.)
- Pending
Links
- 239000000725 suspension Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 12
- 239000007787 solid Substances 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 description 16
- 239000013307 optical fiber Substances 0.000 description 11
- 230000010354 integration Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、下水の活性汚泥法によ
る処理工程中のMLSS(活性汚泥浮遊物質濃度)、余
剰汚泥、返送汚泥、濃縮汚泥等、液中の懸濁物質濃度を
測定する装置に関する。FIELD OF THE INVENTION The present invention measures the concentration of suspended substances in liquid such as MLSS (concentration of suspended solids in activated sludge), surplus sludge, return sludge, concentrated sludge, etc. during the treatment process by the activated sludge method of sewage. Regarding the device.
【0002】[0002]
【従来の技術】従来の懸濁物濃度測定装置には例えば図
3に示す特願昭62ー324522の装置がある。この
装置は、測定対象となる検液中に浸漬される散乱光比較
式の検出部に設置するバンドル光ファイバ体1を、その
中心部に断面円形状の光源用光ファイバ2を配し、その
外周部を取り巻くように、断面環状の光源(赤外発光ダ
イオード3)に近いN用光ファイバ4を同心円状に配し
て形成し、さらに、そのN用光ファイバ4を通して得ら
れた散乱光強度IN出力を平方したものを、F用光ファ
イバ5を通して得られた散乱光強度IFで除するよう演
算処理して汚泥濃度に比例した出力を得るようにしてい
る。2. Description of the Related Art A conventional suspension concentration measuring apparatus is, for example, the apparatus of Japanese Patent Application No. 62-324522 shown in FIG. This apparatus has a bundled optical fiber body 1 installed in a scattered light comparison type detection unit immersed in a test liquid to be measured, and a light source optical fiber 2 having a circular cross section arranged in the center thereof. An optical fiber 4 for N close to a light source (infrared light emitting diode 3) having an annular cross section is concentrically arranged so as to surround the outer periphery, and further, scattered light intensity obtained through the optical fiber 4 for N is formed. The squared I N output is divided by the scattered light intensity I F obtained through the F optical fiber 5 to obtain an output proportional to the sludge concentration.
【0003】尚図3において1aは前記光ファイバ体1
の端面、6は検出器部、7は浮遊物粒子、8は検水、9
は検出用頭部、10はスペーサ、11a,11b,11
cは各々N用、F用、光源用の受光素子を示している。
前記光源用受光素子11cで光電変換された信号は増幅
器12cで増幅された後比較回路部13において基準値
と比較され、光源の光量制御信号が生成される。光源駆
動回路部14は前記光量制御信号に基づいて適正に制御
された電力を赤外発光ダイオード3に送り、これを駆動
して光源強度に変動を生じないよう適正な光量で発光せ
しめる。In FIG. 3, reference numeral 1a designates the optical fiber body 1.
End face, 6 is the detector part, 7 is suspended particles, 8 is water detection, 9
Is a head for detection, 10 is a spacer, 11a, 11b, 11
Reference numerals c denote light receiving elements for N, F, and light sources, respectively.
The signal photoelectrically converted by the light source light-receiving element 11c is amplified by the amplifier 12c and then compared with a reference value in the comparison circuit section 13 to generate a light amount control signal of the light source. The light source drive circuit section 14 sends electric power appropriately controlled based on the light amount control signal to the infrared light emitting diode 3 to drive the infrared light emitting diode 3 so that the infrared light emitting diode 3 emits light with an appropriate light amount so that the light source intensity does not vary.
【0004】前記N用受光素子11a、F用受光素子1
1bで各々光電変換された信号は増幅器12a,12b
で増幅された後、散乱光強度IN、IFとして演算回路1
5に入力される。演算回路15はIN 2/IFなる演算を
行って汚泥濃度に比例した出力を得る。この演算回路1
5の演算結果Zは出力回路16によって所要の出力信号
に代えられた後出力される。The N light receiving element 11a and the F light receiving element 1
The signals photoelectrically converted by 1b are amplifiers 12a and 12b.
After being amplified by, the arithmetic circuit 1 outputs the scattered light intensities I N and I F.
Input to 5. The arithmetic circuit 15 performs an operation of I N 2 / I F to obtain an output proportional to the sludge concentration. This arithmetic circuit 1
The calculation result Z of 5 is output after being changed to a required output signal by the output circuit 16.
【0005】IN,IFの懸濁物濃度に対する出力は図5
のようになる。これを式で表すと IN=I0・S・exp(−βN・S) IF=I0・S・exp(−βF・S) 尚I0は光源強度、Sは懸濁物濃度、βN,βFはそれぞ
れ光源との位置関係、色などによって決まる定数であ
る。ここでIN 2/IF=I0・S・exp(βF−2βN)
・Sとなり、βF−2βN=0とすることによりIN 2/I
F=I0・Sとなり、演算結果と懸濁物濃度が比例関係と
なる。The output of the suspension concentration of I N and I F is shown in FIG.
become that way. When this is expressed by an equation, I N = I 0 · S · exp (−β N · S) I F = I 0 · S · exp (−β F · S) where I 0 is the light source intensity and S is the suspension. Density, β N , and β F are constants determined by the positional relationship with the light source, color, and so on. Where I N 2 / I F = I 0 · S · exp (β F −2β N ).
・ S becomes S, and by setting β F -2β N = 0, I N 2 / I
F = I 0 · S, and the calculation result and the suspension concentration have a proportional relationship.
【0006】図3の装置は、βF−2βN=0(βN,βF
は各受光素子11a,11bと赤外発光ダイオード3と
の間の距離および汚泥の色に関する定数)を満足するよ
うに赤外発光ダイオード3および各受光素子11a,1
1bの配置を決定し、IN 2/IFの演算処理を行い、光
学的な配置を光ファイバを用いて実現したことにより、
図4に示すように汚泥濃度に比例した演算結果Zが得ら
れ、汚泥濃度を精度良く測定できるものである。The apparatus shown in FIG. 3 has a configuration of β F -2 β N = 0 (β N , β F
Represents the distance between each light receiving element 11a, 11b and the infrared light emitting diode 3 and the color constant of the sludge), and the infrared light emitting diode 3 and each light receiving element 11a, 1
By deciding the arrangement of 1b, performing the arithmetic processing of I N 2 / I F , and realizing the optical arrangement using the optical fiber,
As shown in FIG. 4, the calculation result Z proportional to the sludge concentration is obtained, and the sludge concentration can be measured with high accuracy.
【0007】また図3の測定方式では汚泥濃度0のとき
に散乱光強度IFが0となり、IN 2/IFの演算結果が発
散する。これを防ぐため図5のI0に示すような散乱光
強度Iの極めて小さい範囲では、前記散乱光強度IFを
一定値として演算する方法(実願昭63−164634
に記載された方法)が用いられていた。In the measuring method of FIG. 3, the scattered light intensity I F becomes 0 when the sludge concentration is 0, and the calculation result of I N 2 / I F diverges. In order to prevent this, in the extremely small range of the scattered light intensity I as shown by I 0 in FIG. 5, the scattered light intensity I F is calculated as a constant value (Japanese Patent Application No. 63-164634).
The method described in 1) was used.
【0008】[0008]
【発明が解決しようとする課題】図3の装置において、
懸濁物質の色が黒に近くなって散乱光の量が少なくなる
と、各受光部の出力(IN,IF)は図5のIN′,IF′
に示すようになる。このため前述したIFを一定値とし
て演算する方法では、散乱光強度IがI0以下となる
IF′の例では測定ができなくなってしまう。In the apparatus of FIG. 3,
When the color of the suspended substance becomes close to black and the amount of scattered light decreases, the output (I N , I F ) of each light receiving unit becomes I N ′, I F ′ in FIG.
As shown in. Therefore, the above-described method of calculating I F as a constant value makes it impossible to measure I F ′ in which the scattered light intensity I is I 0 or less.
【0009】このように懸濁物の色が黒に近くなると散
乱光量が減少し測定が困難となるが、従来装置における
対策として、発光光量を増加させたり、IFの増幅率を
増加させることが考えられるがいずれも回路の構成上実
施するには限界がある。[0009] While the amount of scattered light color of the thus suspension is close to black is reduced measurement becomes difficult, as a countermeasure in the conventional apparatus, or to increase the amount of light emission, increasing the gain of the I F However, there is a limit to the implementation of these methods due to the circuit configuration.
【0010】本発明は上記の点に鑑みてなされたもので
その目的は、散乱光量が減少した場合でも安定した動作
で測定が行えるとともに演算処理の簡素化を図った懸濁
物濃度測定装置を提供することにある。The present invention has been made in view of the above points, and an object thereof is to provide a suspension concentration measuring apparatus capable of performing measurement in a stable operation even when the amount of scattered light is reduced and simplifying arithmetic processing. To provide.
【0011】[0011]
【課題を解決するための手段】本発明は、(1)検水中
に光線を投射する光源と、検水中の浮遊物で散乱された
光を受光するよう、前記光源から所定距離隔てた点に設
置した第1の受光器と、前記光源からの距離が前記所定
距離よりも遠い点に設置した第2の受光器と、前記第
1、第2の受光器の受光信号を各々増幅する第1、第2
の増幅器と、前記第1の増幅器の出力INと第2の増幅
器の出力IFとを各々積分する第1、第2の積分回路
と、前記第1、第2の積分回路のうちいずれか一方の積
分回路の積分値が所定の積分設定値に到達するまでの時
間を求める時間計測回路と、前記時間と、積分設定値
と、該積分設定値に到達したときの前記いずれか他方の
積分回路の積分値とに基づいて、散乱光比較方式の所定
の演算を行う演算回路とを具備したことを特徴とし、
(2)前記時間計測回路は、第1の積分回路の積分値J
Nが積分設定値A0に到達するまでの時間t0を求める回
路であって、前記演算回路は、前記A0を平方したもの
を、前記A0に到達したときの第2の積分回路の積分値
JFtoおよびt0の積で除する演算を行う回路であるこ
とを特徴とし、(3)前記時間計測回路は、第2の積分
回路の積分値JFが積分設定値B0に到達するまでの時間
t0を求める回路であって、前記演算回路は、前記B0に
到達したときの第1の積分回路の積分値JNtoを平方
したものを、前記B0およびt0の積で除する演算を行う
回路であることを特徴としている。According to the present invention, there are provided (1) a light source for projecting a light beam into a test water and a point separated by a predetermined distance from the light source so as to receive light scattered by a suspended matter in the test water. A first light receiver installed, a second light receiver installed at a point farther from the light source than the predetermined distance, and a first light amplifier that amplifies light reception signals of the first and second light receivers, respectively. , Second
Any one of the first and second integrator circuits for integrating the output I N of the first amplifier and the output I F of the second amplifier, respectively. A time measuring circuit for obtaining the time until the integrated value of one of the integrating circuits reaches a predetermined integral set value, the time, the integral set value, and the integration of the other one when the integral set value is reached. Based on the integrated value of the circuit, an arithmetic circuit for performing a predetermined operation of the scattered light comparison method, characterized in that,
(2) The time measuring circuit is the integrated value J of the first integrating circuit.
A circuit for obtaining a time t 0 until N reaches an integration set value A 0 , wherein the arithmetic circuit is a square of the A 0 and is a value of a second integration circuit of the second integration circuit when the A 0 is reached. characterized by a circuit for performing an operation of dividing by the product of the integrated value J F-to and t 0, (3) the time measuring circuit, the integrated value J F of the second integrating circuit integrating a set value B 0 A circuit for obtaining a time t 0 until reaching, wherein the arithmetic circuit squares an integral value J N to of the first integrator circuit when reaching the B 0 , and the obtained values are B 0 and t 0. It is characterized in that it is a circuit that performs an operation of dividing by the product of.
【0012】[0012]
(1)請求項1、2に記載の発明において、第1の積分
回路の積分値JNが設定値A0に到達したときは、次式が
成立する。(1) In the invention described in claims 1 and 2, when the integral value J N of the first integrator circuit reaches the set value A 0 , the following equation is established.
【0013】[0013]
【数1】 [Equation 1]
【0014】[0014]
【数2】 [Equation 2]
【0015】(ただしt0はJNがA0になったときの時
間)ここでt0の時間は測定対象の汚泥濃度の変化する
時間に比べて非常に短いと考えると、(However, t 0 is the time when J N becomes A 0 ) Here, considering that the time of t 0 is much shorter than the time when the sludge concentration of the measurement object changes,
【0016】[0016]
【数3】 [Equation 3]
【0017】[0017]
【数4】 [Equation 4]
【0018】と考えることができる。これを散乱光比較
方式の演算式Z=IN 2/IFに適用すると、 Z=IN 2/IF=(A0/t0)2/(JFto/t0)=A
0 2/t0・JFto…(5) となる。この(5)式を演算することにより、またAo
の値を適切に選択することにより懸濁物質の色が黒に近
くなって散乱光の量が少ない場合であっても確実に計測
が行える。また(5)式は検出信号INを2乗する必要
がないので、計算が簡単化される。Can be considered as When this is applied to the calculation formula Z = I N 2 / I F of the scattered light comparison system, Z = I N 2 / I F = (A 0 / t 0 ) 2 / (J F to / t 0 ) = A
0 2 / t 0 · J F to ... (5) By calculating this equation (5), A o
By appropriately selecting the value of, even if the amount of scattered light is small because the color of the suspended substance becomes close to black, it is possible to reliably perform measurement. Further, in the equation (5), it is not necessary to square the detection signal I N , so the calculation is simplified.
【0019】(2)請求項1、3に記載の発明におい
て、第2の積分回路の積分値JFが設定値B0に到達した
ときは、次式が成立する。(2) In the invention described in claims 1 and 3, when the integrated value J F of the second integrating circuit reaches the set value B 0 , the following equation is established.
【0020】[0020]
【数5】 [Equation 5]
【0021】[0021]
【数6】 [Equation 6]
【0022】(ただしt0はJFがB0になったときの時
間)ここでt0の時間は測定対象の汚泥濃度の変化する
時間に比べて非常に短いと考えると、(However, t 0 is the time when J F becomes B 0 ) Here, considering that the time of t 0 is much shorter than the time when the sludge concentration of the measurement object changes,
【0023】[0023]
【数7】 [Equation 7]
【0024】[0024]
【数8】 [Equation 8]
【0025】と考えることができる。これを散乱光比較
方式の演算式Z=IN 2/IFに適用すると、 Z=IN 2/IF=(JNto/t0)2/(B0/t0)=J
Nto2/B0t0…(10) となる。この(10)式を演算することにより、またB
oの値を適切に選択することにより、懸濁物質の色が黒
に近くなって散乱光の量が少ない場合であっても確実に
計測が行える。Can be thought of as When this is applied to the arithmetic expression Z = I N 2 / I F of the scattered light comparison system, Z = I N 2 / I F = (J N to / t 0 ) 2 / (B 0 / t 0 ) = J
N to 2 / B 0 t 0 (10) By calculating this equation (10), B
By properly selecting the o value, it is possible to reliably perform measurement even when the color of the suspended substance is close to black and the amount of scattered light is small.
【0026】[0026]
【実施例】以下図面を参照しながら本発明の一実施例を
説明する。図1において図3と同一部分は同一符号をも
って示し、その説明は省略する。前記増幅器12a,1
2bの出力信号IN,IFは積分回路21a,21bで各
々積分され、積分値DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. The amplifiers 12a, 1
The output signals I N and I F of 2b are integrated by integrating circuits 21a and 21b, respectively, and the integrated values
【0027】[0027]
【数9】 [Equation 9]
【0028】[0028]
【数10】 [Equation 10]
【0029】が求められる。Is required.
【0030】22は積分値JNと外部から設定される設
定値A0を比較する比較演算回路である。23は比較演
算回路の比較結果が等しくなった時刻、すなわちReference numeral 22 is a comparison operation circuit for comparing the integrated value J N with a set value A 0 set from the outside. 23 is the time when the comparison results of the comparison operation circuit become equal, that is,
【0031】[0031]
【数11】 [Equation 11]
【0032】となった時刻に該時間tをt0として出力
すると同時に前記積分回路21a,21bにリセット信
号を出力する時間計測回路である。24はA0 2/JFt
o・t0なる演算を行う演算回路である。この演算回路
24の演算結果Zは出力回路25によって所要の出力信
号Z′に代えられた後出力される。また出力回路25で
は次の演算結果が得られるまで前回の値を出力し、演算
結果が得られる毎に値を更新する。The time measuring circuit outputs the time t as t 0 at the time when the time becomes and at the same time outputs a reset signal to the integrating circuits 21a and 21b. 24 is A 0 2 / J F t
This is an arithmetic circuit that performs an arithmetic operation of o · t 0 . The calculation result Z of the calculation circuit 24 is output by the output circuit 25 after being replaced by the required output signal Z '. The output circuit 25 outputs the previous value until the next calculation result is obtained, and updates the value each time the calculation result is obtained.
【0033】尚検出器部6の構造や、赤外発光ダイオー
ド3の光の一部を光源用受光素子11cで受光し、増幅
器12c、比較回路部13および光源駆動回路部14に
よって受光量を一定に制御する部分は図3と同一に構成
されている。The structure of the detector section 6 and a part of the light of the infrared light emitting diode 3 are received by the light receiving element 11c for the light source, and the amount of light received is constant by the amplifier 12c, the comparison circuit section 13 and the light source drive circuit section 14. The control part is configured the same as in FIG.
【0034】上記のように構成された装置において、積
分回路21a,21bに入力された信号IN,IFは図2
に示すように各々積分される。図2のJNto,JFto
は、前記(13)式を満足するときの積分値であり、次
式で表される。In the apparatus configured as described above, the signals I N and I F input to the integrating circuits 21a and 21b are as shown in FIG.
Each is integrated as shown in. J N to, J F to in FIG.
Is an integral value when the above expression (13) is satisfied, and is expressed by the following expression.
【0035】[0035]
【数12】 [Equation 12]
【0036】[0036]
【数13】 [Equation 13]
【0037】ここでt0の時間は測定対象の汚泥濃度の
変化する時間に比べて非常に短いと考えると、Considering that the time t 0 is much shorter than the time when the sludge concentration to be measured changes,
【0038】[0038]
【数14】 [Equation 14]
【0039】[0039]
【数15】 [Equation 15]
【0040】と考えることができる。これを散乱光比較
方式の演算式Z=IN 2/IFに適用すると、 Z=IN 2/IF=(A0/t0)2/(JFto/t0)=A
0 2/t0JFto…(5) となる。したがって前記演算回路24により(5)式を
演算することにより極低濃度領域を含むすべての濃度領
域にわたって安定して測定結果が得られる。Can be considered as When this is applied to the calculation formula Z = I N 2 / I F of the scattered light comparison system, Z = I N 2 / I F = (A 0 / t 0 ) 2 / (J F to / t 0 ) = A
0 2 / t 0 J F to ... (5) Therefore, by calculating the equation (5) by the arithmetic circuit 24, the measurement result can be stably obtained over all the concentration regions including the extremely low concentration region.
【0041】尚上記方法では図5のIN′の値によって
演算出力周期t0が変化するが、測定対象の濃度変化の
時間がt0に比べて長い場合に有効である。In the above method, the calculation output cycle t 0 changes depending on the value of I N ′ in FIG. 5, but it is effective when the time for changing the concentration of the measurement object is longer than t 0 .
【0042】上記実施例では積分設定値A0を(1)式
のように設定して積分の終点を決定していたが、逆に積
分の終点をIF側で決定しても良い。すなわち、In the above embodiment, the integral set value A 0 is set as in equation (1) to determine the end point of the integration, but conversely, the end point of the integration may be determined on the IF side. That is,
【0043】[0043]
【数16】 [Equation 16]
【0044】を満足するときの積分値JFto,JNto
を、Integral values J F to, J N to when satisfying
To
【0045】[0045]
【数17】 [Equation 17]
【0046】[0046]
【数18】 [Equation 18]
【0047】とし、前記と同様にt0が汚泥濃度変化時
間に比べて非常に短いと考えると、Then, considering that t 0 is much shorter than the sludge concentration change time in the same manner as described above,
【0048】[0048]
【数19】 [Formula 19]
【0049】[0049]
【数20】 [Equation 20]
【0050】とすることができる。これを従来の散乱光
比較方式の演算式Z=IN 2/IFに適用し、 Z=IN 2/IF=(JNto/t0)2/(B0/t0)=J
Nto2/B0t0…(10) なる演算式を計算して汚泥濃度の測定結果を得る。It can be This was applied to a computing equation Z = I N 2 / I F of a conventional scattered light comparison method, Z = I N 2 / I F = (J N to / t 0) 2 / (B 0 / t 0) = J
Obtaining a measurement result of the sludge concentration to calculate the N to 2 / B 0 t 0 ... (10) becomes operational expression.
【0051】この場合図1の回路を一部変更し、積分回
路21bの出力JFと積分設定値B0を比較演算回路22
によって比較し、JFがB0に到達するまでの時間t0を
時間計測回路23で求め、前記演算式(10)(Z=J
Nto2/B0・t0)を演算回路24で演算して出力する
ように構成すれば容易に実施することができる。In this case, the circuit of FIG. 1 is partly modified so that the output J F of the integrating circuit 21b and the integral set value B 0 are compared and calculated 22.
And the time t 0 until J F reaches B 0 is calculated by the time measuring circuit 23, and the calculation formula (10) (Z = J
If N to 2 / B 0 · t 0 ) is configured to be calculated and output by the arithmetic circuit 24, it can be easily implemented.
【0052】尚、一般にIN>IFであるためt0の測定
は(6)式によるよりも(3)式のほうが精度よく求め
られる。また図1の回路の各種演算は、コンピュータに
よるソフト的な処理によって実現しても良い。In general, since I N > I F , the equation (3) is more accurately required for measuring t 0 than the equation (6). Further, various calculations of the circuit of FIG. 1 may be realized by software processing by a computer.
【0053】[0053]
【発明の効果】以上のように請求項1、2、3の発明に
よれば、増幅器の出力INとIFとを各々積分する第1、
第2の積分回路と、前記第1、第2の積分回路のうちい
ずれか一方の積分回路の積分値が所定の積分設定値に到
達するまでの時間を求める時間計測回路と、前記時間
と、積分設定値と、該積分設定値に到達したときの前記
いずれか他方の積分回路の積分値とに基づいて、散乱光
比較方式の所定の演算を行う演算回路とを設けたので、
懸濁物の色が黒に近く、散乱光量が極端に低下した場合
でも充分に計測を行うことができる。このため極低濃度
から高濃度までの広い範囲で正確な測定が期待できる。As described above, according to the first, second and third aspects of the present invention, the first and the second of integrating outputs I N and I F of the amplifier, respectively.
A second integrator circuit, a time measuring circuit for determining a time required for the integrated value of one of the first and second integrator circuits to reach a predetermined integral set value, and the time. Since an integration setting value and an operation circuit for performing a predetermined operation of the scattered light comparison method based on the integration value of the other integration circuit when the integration setting value is reached are provided,
Even if the color of the suspension is close to black and the amount of scattered light is extremely reduced, the measurement can be sufficiently performed. Therefore, accurate measurement can be expected in a wide range from extremely low concentration to high concentration.
【0054】また請求項1、2の発明によれば、従来の
ような検出信号の2乗の演算(IN 2/IFを求める演
算)を行う必要はなく、計算が非常に簡単化される。こ
のため演算処理速度が速められる。According to the first and second aspects of the present invention, it is not necessary to perform the square calculation of the detection signal (calculation for obtaining I N 2 / I F ) as in the conventional case, and the calculation is greatly simplified. It Therefore, the calculation processing speed is increased.
【図1】本発明の一実施例を示す全体概略構成図。FIG. 1 is an overall schematic configuration diagram showing an embodiment of the present invention.
【図2】実施例の要部である積分回路の動作を説明する
積分波形図。FIG. 2 is an integrated waveform diagram for explaining the operation of an integrator circuit, which is a main part of the embodiment.
【図3】従来の懸濁物濃度検出装置の一例を示す全体概
略構成図。FIG. 3 is an overall schematic configuration diagram showing an example of a conventional suspension concentration detecting device.
【図4】SS濃度対演算結果の関係を示す特性図。FIG. 4 is a characteristic diagram showing the relationship between SS concentration and calculation results.
【図5】SS濃度対散乱光強度の関係を示す特性図。FIG. 5 is a characteristic diagram showing the relationship between SS concentration and scattered light intensity.
1…バンドル光ファイバ体 2…光源用光ファイバ 3…赤外発光ダイオード 4…N用光ファイバ 5…F用光ファイバ 6…検出器部 11a…N用受光素子 11b…F用受光素子 11c…光源用受光素子 12a,12b…増幅器 13…比較回路部 14…光源駆動回路部 21a,21b…積分回路 22…比較演算回路 23…時間計測回路 24…演算回路 25…出力回路 DESCRIPTION OF SYMBOLS 1 ... Bundled optical fiber body 2 ... Light source optical fiber 3 ... Infrared light emitting diode 4 ... N optical fiber 5 ... F optical fiber 6 ... Detector part 11a ... N light receiving element 11b ... F light receiving element 11c ... Light source Light receiving elements 12a, 12b ... Amplifier 13 ... Comparison circuit section 14 ... Light source drive circuit section 21a, 21b ... Integrating circuit 22 ... Comparison arithmetic circuit 23 ... Time measuring circuit 24 ... Arithmetic circuit 25 ... Output circuit
Claims (3)
の浮遊物で散乱された光を受光するよう、前記光源から
所定距離隔てた点に設置した第1の受光器と、前記光源
からの距離が前記所定距離よりも遠い点に設置した第2
の受光器と、前記第1、第2の受光器の受光信号を各々
増幅する第1、第2の増幅器と、前記第1の増幅器の出
力INと第2の増幅器の出力IFとを各々積分する第1、
第2の積分回路と、前記第1、第2の積分回路のうちい
ずれか一方の積分回路の積分値が所定の積分設定値に到
達するまでの時間を求める時間計測回路と、前記時間
と、積分設定値と、該積分設定値に到達したときの前記
いずれか他方の積分回路の積分値とに基づいて、散乱光
比較方式の所定の演算を行う演算回路とを具備したこと
を特徴とする懸濁物濃度測定装置。1. A light source for projecting a light beam into the test water, a first light receiver installed at a point separated from the light source by a predetermined distance so as to receive light scattered by suspended matter in the test water, and the light source. The second installed at a point where the distance from
And light receiver, wherein the first, the first amplifying each received light signal of the second photodetector, a second amplifier, and an output I F output I N and a second amplifier of the first amplifier First to integrate each,
A second integrator circuit, a time measuring circuit for determining a time required for the integrated value of one of the first and second integrator circuits to reach a predetermined integral set value, and the time. It is characterized by further comprising an arithmetic circuit for performing a predetermined arithmetic operation of the scattered light comparison method based on an integral set value and an integral value of the other one of the integral circuits when the integral set value is reached. Suspension concentration measuring device.
積分値JNが積分設定値A0に到達するまでの時間t0を
求める回路であって、前記演算回路は、前記A0を平方
したものを、前記A0に到達したときの第2の積分回路
の積分値JFt0およびt0の積で除する演算を行う回路で
あることを特徴とする請求項1に記載の懸濁物濃度測定
装置。2. The time measuring circuit is a circuit for obtaining a time t 0 until the integrated value J N of the first integrating circuit reaches an integral set value A 0 , and the arithmetic circuit is the A 0. The suspension circuit according to claim 1, wherein the circuit is a circuit that performs an operation of dividing a squared value by a product of the integral values J Ft0 and t 0 of the second integrator circuit when reaching A 0. Suspended substance concentration measuring device.
積分値JFが積分設定値B0に到達するまでの時間t0を
求める回路であって、前記演算回路は、前記B0に到達
したときの第1の積分回路の積分値JNt0を平方したも
のを、前記B0およびt0の積で除する演算を行う回路で
あることを特徴とする請求項1に記載の懸濁物濃度測定
装置。3. The time measuring circuit is a circuit for obtaining a time t 0 until the integral value J F of the second integrating circuit reaches an integral set value B 0 , and the arithmetic circuit is the B 0. 2. The suspension circuit according to claim 1, wherein the circuit is a circuit for performing an operation of dividing a square of an integral value J Nt0 of the first integrator circuit when the value of is reached by the product of B 0 and t 0. Suspended substance concentration measuring device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5330471A JPH07190927A (en) | 1993-12-27 | 1993-12-27 | Concentration measuring apparatus for suspension |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5330471A JPH07190927A (en) | 1993-12-27 | 1993-12-27 | Concentration measuring apparatus for suspension |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07190927A true JPH07190927A (en) | 1995-07-28 |
Family
ID=18232999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5330471A Pending JPH07190927A (en) | 1993-12-27 | 1993-12-27 | Concentration measuring apparatus for suspension |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07190927A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010509583A (en) * | 2006-11-10 | 2010-03-25 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Photoacoustic detector with improved signal processing |
-
1993
- 1993-12-27 JP JP5330471A patent/JPH07190927A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010509583A (en) * | 2006-11-10 | 2010-03-25 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Photoacoustic detector with improved signal processing |
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