JPH0979875A - Physical quantity measuring device and its measuring method - Google Patents
Physical quantity measuring device and its measuring methodInfo
- Publication number
- JPH0979875A JPH0979875A JP23291295A JP23291295A JPH0979875A JP H0979875 A JPH0979875 A JP H0979875A JP 23291295 A JP23291295 A JP 23291295A JP 23291295 A JP23291295 A JP 23291295A JP H0979875 A JPH0979875 A JP H0979875A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- bridge circuit
- resistance
- measuring
- resistance value
- 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
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は被測定物の歪量と温
度とを測定可能な変位及び温度等の物理量測定装置及び
その測定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a physical quantity such as displacement and temperature capable of measuring the strain amount and temperature of an object to be measured, and a measuring method therefor.
【０００２】[0002]
【従来の技術】従来から、受感部を歪ゲージで構成した
ブリッジ回路と感温抵抗素子とを用いて歪量及び温度の
計測を行なえる様に成した変換器はよく知られている。
この様な変換器ではホイートストンブリッジ回路の入出
力端子用の４本の延長コード並びにホイートストンブリ
ッジ回路の出力端に直列接続した感温抵抗素子の両端か
ら引き出した２本の延長コードを用いて歪量及び温度の
測定が行なわれるために延長コードの重量が増すこと
と、温度測定時には感温抵抗素子の両端から引き出した
延長コードの２本の抵抗２ｒに流れる電圧降下分を差し
引く様に成されているため、延長コードの長さが変化す
るとその差し引き量を変えなければならない問題があ
り、この様な問題を解消するために延長コード数を４本
で済ませ延長コードの抵抗ｒを自動的に補正させる様に
成した温度及び歪等の物理量測定装置が特開昭５８−１
３４３９４号公報に開示されて公知である。2. Description of the Related Art Conventionally, there has been well known a converter which can measure a strain amount and a temperature by using a temperature sensitive resistance element and a bridge circuit in which a sensitive portion is composed of a strain gauge.
Such a converter uses four extension cords for input / output terminals of the Wheatstone bridge circuit and two extension cords drawn from both ends of the temperature-sensitive resistance element connected in series to the output end of the Wheatstone bridge circuit. In addition, the weight of the extension cord is increased due to the temperature measurement, and the voltage drop flowing through the two resistances 2r of the extension cord drawn from both ends of the temperature sensitive resistance element is subtracted when measuring the temperature. Therefore, there is a problem that when the length of the extension cord changes, the deduction amount must be changed. To solve such a problem, the number of extension cords can be reduced to 4 and the resistance r of the extension cord is automatically corrected. Japanese Patent Laid-Open No. 58-1 / 58-1
It is disclosed and known in Japanese Patent No. 34394.
【０００３】上記公報に開示されている歪及び温度測定
装置の構成を図３及び図４によって説明する。図３は歪
量測定時の等価回路を示すものでホイートストンブリッ
ジ回路１のストレンゲージ（抵抗歪）の対向する抵抗値
ＳＧ1 とＳＧ3 及びＳＧ2 とＳＧ4 は等しいので測定装
置本体側の第１又は第２の定電流源Ｓ1 又はＳ2 から入
力端子Ｃ′及びＡ′と抵抗値ｒを夫々有する延長コード
部の芯線ｌ1 及びｌ2を介してセンサ部のブリッジ回路
１の入力端子Ａ及びＣに供給される定電流ｉはブリッジ
回路１の合成抵抗は略々一定であるため、入力端子Ａ及
びＣに一定の電圧が印加され、ブリッジ回路１の出力端
子ＤＢ間は歪の変化に対応した電圧変化を生ずる。The structure of the strain and temperature measuring device disclosed in the above publication will be described with reference to FIGS. FIG. 3 shows an equivalent circuit at the time of measuring the strain amount. Since the opposing resistance values SG 1 and SG 3 and SG 2 and SG 4 of the strain gauge (resistance strain) of the Wheatstone bridge circuit 1 are equal, 1 or the second constant current source S 1 or the input terminal C from the S 2 'and a' and the input terminal of the bridge circuit 1 of the resistance value r via the core wire l 1 and l 2 of the extension cord portion with each sensor unit The constant current i supplied to A and C is such that the combined resistance of the bridge circuit 1 is substantially constant, so a constant voltage is applied to the input terminals A and C, and the change in distortion between the output terminals DB of the bridge circuit 1. A voltage change corresponding to
【０００４】出力端子Ｄ及びＢには感熱抵抗素子ＲX 及
び芯線ｌ3 及びｌ4 の抵抗分ｒを有するが、測定装置本
体の出力端子Ｄ′及びＢ′に接続された増幅器Ａ3 の入
力インピーダンスを充分に大きくして、芯線ｌ1 及びｌ
2 の合成抵抗２ｒや感熱抵抗素子Ｒの抵抗ＲX を無視し
得る様に成して、歪量をメータＭに測定指示する。The output terminals D and B have the heat sensitive resistance element R X and the resistance r of the cores l 3 and l 4 , but the input of the amplifier A 3 connected to the output terminals D'and B'of the measuring apparatus main body. Make the impedance sufficiently large so that the core wires l 1 and l
Forms as negligible resistance R X 2 combined resistance 2r and thermosensitive resistor elements R, measured instructs the amount of distortion in the meter M.
【０００５】次に被測定物の温度を測定する場合を図４
によって説明する。図４は測温時の等価回路を示すもの
であり、図３で示す入力端子ＡＣは短絡され、第１の電
流源Ｓ1 は出力端子Ｂ′と入力端子Ａ′（Ｃ′）間に接
続され第２の電流源Ｓ2 は出力端子Ｄ′と入力端子Ａ′
（Ｃ′）間に接続される。図中Ｚ1 は端子Ｄ−Ａ′間の
合成抵抗、Ｚ2 は端子Ｂ−Ａ′間の合成抵抗、Ｅ0 は端
子Ｄ′−Ｂ′間の電圧、Ｅ1 は端子Ｄ′−Ａ′間の電
圧、Ｅ2 は端子Ｂ′−Ａ′間の電圧である。従ってＥ0
は下記の数１で与えられる。Next, the case of measuring the temperature of the object to be measured is shown in FIG.
It will be explained by. FIG. 4 shows an equivalent circuit at the time of temperature measurement. The input terminal AC shown in FIG. 3 is short-circuited, and the first current source S 1 is connected between the output terminal B ′ and the input terminal A ′ (C ′). The second current source S 2 has an output terminal D ′ and an input terminal A ′.
It is connected between (C '). Figure Z 1 is terminal D-A 'combined resistance between, Z 2 is the terminal B-A' combined resistance between, E 0 is the terminal D'-B 'voltage between, E 1 is the terminal D'-A' voltage between, E 2 is the voltage between terminals B'-a '. Therefore E 0
Is given by Equation 1 below.
【０００６】[0006]
【数１】 Ｅ0 ＝Ｅ1 −Ｅ2 ＝（ｒｉ＋ＲX ｉ＋Ｚ1 ｉ）−（ｒｉ＋Ｚ2 ｉ） ＝ＲX ｉ＋Ｚｉ−Ｚ2 ｉ＝ＲX ｉ＋（Ｚ1 −Ｚ2 ）ｉ ≒ＲX ｉ ここで、（Ｚ1 −Ｚ2 ）は感熱抵抗素子１２の温度に対
し無視出来る値でＥ0≒Ｒxiとみなせる。[Equation 1] E 0 = E 1 −E 2 = (ri + R X i + Z 1 i) − (ri + Z 2 i) = R X i + Zi−Z 2 i = R X i + (Z 1 −Z 2 ) i ≈R X i Here, (Z 1 −Z 2 ) is a value that can be ignored with respect to the temperature of the thermal resistance element 12, and can be regarded as E 0 ≈R xi .
【０００７】また０℃のときの端子Ｄ′−Ｂ′間の電圧
をＥ0 （０℃）とし、ｔ℃のときの同電圧をＥ0 （ｔ
℃）とし、０℃のときの感温抵抗素子Ｒの抵抗値をＲX0
とし、感温抵抗素子Ｒの抵抗温度係数をαとし、被測定
物が０℃からｔ℃に変化した場合における端子Ｄ′−
Ｂ′間の電圧変化分をΔＥ0 とすれば、次の数２で与え
られる。The voltage between terminals D'and B'at 0 ° C is E 0 (0 ° C), and the same voltage at t ° C is E 0 (t).
℃), and the resistance value of the temperature-sensitive resistance element R at 0 ℃ is R X0
And the temperature coefficient of resistance of the temperature sensitive resistance element R is α, and the terminal D'- when the measured object changes from 0 ° C to t ° C.
If the voltage change between B ′ is ΔE 0 , it is given by the following equation 2.
【０００８】[0008]
【数２】 ΔＥ0 ＝Ｅ0 （ｔ℃）−Ｅ0 （０℃） ＝ＲX0（１＋αｔ）ｔ−ＲX0・ｉ ＝ＲX0・α・ｉ・ｔ となる。## EQU2 ## ΔE 0 = E 0 (t ° C.) − E 0 (0 ° C.) = R X0 (1 + αt) t−R X0 · i = R X0 · α · i · t.
【０００９】この式から、前記電圧変化分ΔＥ0 は、温
度ｔと比例関係になる。この電圧を増幅器Ａ3 で増幅
し、メータＭで表示すれば、被測定物の温度を測定する
ことになる。この場合、芯線ｌ3 ，ｌ4 の抵抗ｒに全く
影響されずに測定できる。但し、これらの計算過程で合
成抵抗（Ｚ1 −Ｚ2 ）を零と考えているので、その分が
誤差として表わることになる。From this equation, the voltage change ΔE 0 has a proportional relationship with the temperature t. If this voltage is amplified by the amplifier A 3 and displayed on the meter M, the temperature of the object to be measured is measured. In this case, the measurement can be performed without being affected by the resistance r of the core wires l 3 and l 4 . However, since the combined resistance (Z 1 −Z 2 ) is considered to be zero in these calculation processes, that amount is expressed as an error.
【００１０】[0010]
【発明が解決しようとする課題】上述の構成の変位及び
温度測定装置によれば温度測定時にブリッジ回路の入力
を短絡して芯線ｌ3 及びｌ4 の抵抗ｒ及びｒをキャンセ
ルするために２つの等しい電流源Ｓ1 及びＳ2 を必要と
するので測定装置本体側の構成が複雑化し、高価になる
問題があった。According to the displacement and temperature measuring device having the above-mentioned structure, the two inputs for canceling the resistances r and r of the core wires l 3 and l 4 by short-circuiting the input of the bridge circuit at the time of temperature measurement. Since the same current sources S 1 and S 2 are required, there is a problem that the structure of the measuring device main body side becomes complicated and the cost becomes high.
【００１１】本発明は叙上の問題点を解消した変位及び
温度等の物理量測定装置及びその測定方法を提供するも
ので１つの定電流源を用いて歪及び温度測定可能な歪と
温度測定装置並びに上述の従来構成とは全く異なる測定
方法によって歪と温度測定を行なうことの出来る歪及び
温度測定方法を提供することにある。The present invention provides a device for measuring physical quantities such as displacement and temperature and a method for measuring the same, which solves the above problems. It is possible to measure strain and temperature using one constant current source. Another object of the present invention is to provide a strain and temperature measuring method capable of measuring strain and temperature by a measuring method which is completely different from the conventional configuration described above.
【００１２】[0012]
【課題を解決するための手段】本発明の物理量測定装置
は変位量を電気量に変換するブリッジ回路１の一方の出
力端に感温抵抗素子Ｒを直列に接続したセンサ部２と、
上記ブリッジ回路１の出力端側に接続可能に成された増
幅器Ａ3 と、上記ブリッジ回路１の入出力端側に接続可
能に成された定電流源Ｓ1 とを有する測定装置本体４と
を有し、上記センサ部２による測温時にブリッジ回路１
の入力側抵抗と出力側抵抗を夫々求めた出力側抵抗値か
ら入力側抵抗値を差し引くことで感温抵抗素子Ｒの抵抗
値を求め、該抵抗値から演算により温度に変換すること
を特徴とする物理量測定装置である。A physical quantity measuring apparatus of the present invention comprises a sensor section 2 in which a temperature sensitive resistance element R is connected in series to one output end of a bridge circuit 1 for converting a displacement quantity into an electric quantity.
A measuring device main body 4 having an amplifier A 3 connectable to the output end side of the bridge circuit 1 and a constant current source S 1 connectable to the input / output end side of the bridge circuit 1. And has a bridge circuit 1 when measuring the temperature by the sensor unit 2.
The resistance value of the temperature-sensitive resistance element R is obtained by subtracting the input-side resistance value from the output-side resistance value obtained by respectively obtaining the input-side resistance and the output-side resistance, and the resistance value is converted into a temperature by calculation. This is a physical quantity measuring device.
【００１３】本発明の変位及び温度等の物理量測定方法
は変位量を電気量に変換するブリッジ回路１の出力端に
感温抵抗素子Ｒを直列に接続させたセンサ部２によって
変位及び温度等の物理量を測定する測定方法に於いて、
上記ブリッジ回路の入力側抵抗と出力側抵抗を夫々求め
た出力側抵抗値から入力側抵抗値を差し引くことでセン
サ部２内の感温抵抗素子の抵抗値を求め、該抵抗値から
演算により温度に変換して温度を測定して成ることを特
徴とする物理量測定方法である。The physical quantity measuring method for displacement and temperature according to the present invention uses a sensor unit 2 in which a temperature sensitive resistance element R is connected in series to an output end of a bridge circuit 1 for converting the displacement quantity into an electric quantity. In the measurement method to measure the physical quantity,
The resistance value of the temperature-sensitive resistance element in the sensor unit 2 is calculated by subtracting the input resistance value from the output resistance value of the input resistance and the output resistance value of the bridge circuit, and the temperature value is calculated from the resistance value. It is a physical quantity measuring method characterized in that the temperature is measured by converting into.
【００１４】本発明の物理量測定装置とその測定方法に
よれば測定装置本体側の定電流源が１つで済み２つの等
しい電流源を用いて延長コードの芯線ｌ3 及びｌ4 の抵
抗値をキャンセルする様な操作を行なわなくて済むた
め、二つの定電流源のアンバランスによって生ずる測定
誤差等が生ぜず簡単な構成と方法で被測定物の変位と温
度を測定することが出来る。According to the physical quantity measuring device and the measuring method thereof of the present invention, the number of constant current sources on the measuring device main body side is only one, and the resistance values of the core wires l 3 and l 4 of the extension cord are measured by using two equal current sources. Since it is not necessary to perform an operation for canceling, the displacement and temperature of the object to be measured can be measured with a simple configuration and method without causing a measurement error or the like caused by the imbalance of the two constant current sources.
【００１５】[0015]
【発明の実施の形態】以下、本発明の物理量測定装置及
びその測定方法を図１によって詳記する。尚図３及び図
４で説明した従来の回路図との対応部分には同一符号を
付して示す。BEST MODE FOR CARRYING OUT THE INVENTION The physical quantity measuring apparatus and its measuring method of the present invention will be described in detail below with reference to FIG. The parts corresponding to those of the conventional circuit diagrams described in FIGS. 3 and 4 are designated by the same reference numerals.
【００１６】図１の本例の変位及び温度等の物理量測定
装置５はブリッジ回路１を有するセンサ部２、延長コー
ド部３並びに測定装置本体４から構成されている。セン
サ部２には、ストレーンゲージの抵抗ＳＧ1 〜ＳＧ4 に
よるブリッジ回路１と、ブリッジ回路１の１つの出力端
９に接続された感温抵抗素子Ｒが直列に接続されてい
る。抵抗ＳＧ1 〜ＳＧ4 は、互いに同一規格のものが用
いられる。ブリッジ回路１の他の出力端８及び感温抵抗
素子Ｒの他端は出力端子Ｂ及びＤに接続されている。A physical quantity measuring device 5 for displacement, temperature, etc. of the present example shown in FIG. 1 comprises a sensor section 2 having a bridge circuit 1, an extension cord section 3 and a measuring apparatus body 4. The sensor unit 2 is connected in series with the bridge circuit 1 formed by the resistances SG 1 to SG 4 of the strain gauge, and the temperature-sensitive resistance element R connected to one output end 9 of the bridge circuit 1. The resistors SG 1 to SG 4 having the same standard are used. The other output end 8 of the bridge circuit 1 and the other end of the temperature sensitive resistance element R are connected to the output terminals B and D.
【００１７】感温抵抗素子Ｒは抵抗値ＲX ＝１００Ωで
サーミスタ、白金線、ニッケル線等の測温抵抗体や磁気
表面に特殊金属膜を形成して絶縁被覆した感温抵抗器等
が用いられる。延長コード部３には４本の芯線ｌ1 〜ｌ
4 が設けられ、その芯線抵抗は総てｒである。芯線ｌ1
及びｌ2 は、ブリッジ回路１の入力端６及び７に入力端
子Ａ及びＣを介して接続され、他端は測定装置本体４の
入力端子Ａ′Ｃ′に接続されている。又、芯線ｌ3 及び
ｌ4 は出力端子Ｄ及びＢに接続され、他端は測定装置本
体４の出力端子Ｄ′及びＢ′に接続されている。芯線は
最大２ｋｍで芯線抵抗ｒ＝１６０Ω程度である。The temperature-sensitive resistance element R has a resistance value R X = 100Ω and is used as a thermistor, a temperature-measuring resistor such as a platinum wire or a nickel wire, or a temperature-sensitive resistor in which a special metal film is formed on a magnetic surface for insulation. To be The extension cord portion 3 has four core wires l 1 to l.
4 is provided, and the core resistance is all r. Core wire l 1
And l 2 are connected to the input ends 6 and 7 of the bridge circuit 1 via input terminals A and C, and the other end is connected to the input terminal A′C ′ of the measuring device body 4. The cores l 3 and l 4 are connected to the output terminals D and B, and the other ends are connected to the output terminals D ′ and B ′ of the measuring device body 4. The core wire has a maximum length of 2 km and the core wire resistance r is about 160Ω.
【００１８】測定装置本体４の入力端子Ａ′及びＣ′は
第１のスイッチＳＷ1 の可動接片ａ 1 及びａ1 に接続さ
れ、出力端子Ｄ′及びＢ′は第２のスイッチＳＷ2 の固
定接点ｃ2 及びｃ2 に接続されている。第１及び第２の
スイッチＳＷ1 及びＳＷ2 は２極双投型のスイッチであ
り、第１のスイッチＳＷ1 の一方の固定接点ｃ1 は一端
が接地された電流源Ｓ1 に接続され、他方の固定接点ｃ
1 は接地電位に落とされている。The input terminals A'and C'of the measuring device body 4 are
First switch SW1Movable contact piece a 1And a1Connected to
The output terminals D'and B'are connected to the second switch SW.2Solid
Constant contact c2And c2It is connected to the. First and second
Switch SW1And SW2Is a double pole double throw switch
The first switch SW1One fixed contact c1Is once
Current source S whose ground is1Connected to the other fixed contact c
1Is dropped to ground potential.
【００１９】第１のスイッチＳＷ1 の二つの固定接点ｂ
1 及びｂ1 は共に第２のスイッチＳＷ2 の固定接点ｂ2
及びｂ2 に接続されている。第２のスイッチＳＷ2 の可
動接片ａ2 及びａ2 は増幅器Ａ3 の非反転及び反転入力
端子に接続されている。Two fixed contacts b of the first switch SW 1
1 and b 1 are both fixed contacts b 2 of the second switch SW 2.
It is connected to and b 2. The movable contacts a 2 and a 2 of the second switch SW 2 are connected to the non-inverting and inverting input terminals of the amplifier A 3 .
【００２０】更に、２極双投の第３のスイッチＳＷ3 の
可動接片ａ3 及びａ3 の一端を接地電位に落とすと共に
他端を電流源Ｓ1 に接続する。第３のスイッチＳＷ3 の
固定接点ｂ3 及びｂ3 は増幅器Ａ3 の非反転及び反転入
力端子に接続され、固定接点ｃ3 及びｃ3 は開放状態と
成されている。Further, one ends of the movable contact pieces a 3 and a 3 of the third double-pole double-throw switch SW 3 are dropped to the ground potential and the other end is connected to the current source S 1 . The third fixed contact b 3 and b 3 of the switch SW 3 is connected to the non-inverting and inverting input terminal of the amplifier A 3, the fixed contact c 3 and c 3 are made open.
【００２１】更に図示しないがコンピュータ等を介して
第１乃至第３のスイッチＳＷ1 〜ＳＷ3 を制御すると共
に増幅器Ａ3 の出力端ＴOUT に得られた抵抗変化量をＡ
／Ｄ変換器等でデジタル化した後に温度に変換する制御
回路が設けられている。Although not shown, the first to third switches SW 1 to SW 3 are controlled via a computer or the like, and the resistance change amount obtained at the output terminal T OUT of the amplifier A 3 is A.
A control circuit for converting the temperature into a temperature after being digitized by a / D converter or the like is provided.
【００２２】上述の回路構成に於ける動作を以下説明す
る。先ず歪を測定する場合を詳記する。歪測定は従来の
等価回路である図３で説明したと同様に動作させる。即
ち図１で歪測定用の被測定物にセンサ部２を対接させ第
１乃至第３のスイッチＳＷ1〜ＳＷ3 のすべての可動接
片ａ1 〜ａ3 を固定接点ｃ1 〜ｃ3 側に切換えると、第
１のスイッチＳＷ1 の一方の固定接点ｃ1 →可動接片ａ
1 →入力端子Ａ′→芯線ｌ1 →入力端子Ａ→入力端６→
ブリッジ回路１→入力端７→入力端子Ｃ→芯線ｌ2 →入
力端子Ｃ′→第１のスイッチＳＷ1 の可動接片ａ1 →固
定接点ｃ1 →接地の系路で定電流源Ｓ1 から定電流ｉが
ブリッジ回路１に流され、ストレンゲージの抵抗ＳＧ1
とＳＧ3 ，ＳＧ2 とＳＧ4 は同じ様な抵抗変化をするた
め抵抗ＳＧ1 とＳＧ4 並びにＳＧ2 とＳＧ4 との夫々の
合成抵抗は同じで、ブリッジ回路１の合成抵抗は略々一
定であり入力端６及び７内に一定の電圧が印加されるこ
とになる。The operation of the above circuit configuration will be described below. First, the case of measuring strain will be described in detail. The distortion measurement is operated in the same manner as described in FIG. 3 which is a conventional equivalent circuit. That all of the movable contact piece a 1 ~a 3 fixed contacts c 1 to c 3 of the first to third switches SW 1 to SW 3 is Taise' the sensor section 2 to the object to be measured for the strain measuring in Figure 1 When switched to the side, one fixed contact of the first switch SW 1 c 1 → movable contact piece a
1 → input terminal A '→ core wire l 1 → input terminal A → input end 6 →
From the bridge circuit 1 → input 7 → the input terminal C → core l 2 → input terminal C '→ first movable contact piece a 1 → stationary contact c 1 → constant current source S 1 in a system path of the ground switch SW 1 A constant current i is passed through the bridge circuit 1 and the strain gauge resistance SG 1
And SG 3, SG 2 and SG 4 are combined resistance of each of the resistor SG 1 and SG 4 and SG 2 and SG 4 for the same kind of resistance change are the same and the combined resistance of the bridge circuit 1 is substantially constant Therefore, a constant voltage is applied to the input terminals 6 and 7.
【００２３】一方、ブリッジ回路１の出力端９は感温抵
抗素子Ｒ→出力端子Ｄ→芯線ｌ3 →出力端子Ｄ′→第２
のスイッチＳＷ2 の一方の固定接点ｃ2 →可動接片ａ2
→増幅器Ａ3 の非反転入力端子の系路で、又、他方のブ
リッジ回路１の出力端８は出力端子Ｂ→芯線ｌ4 →出力
端子Ｂ′→第２のスイッチＳＷ2 の他方の固定接点ａ 2
→増幅器Ａ3 の反転入力端子に接続され、出力端子Ｔ
OUT にブリッジ回路１の電圧変化分が取り出される。On the other hand, the output terminal 9 of the bridge circuit 1 has a temperature-sensitive resistance.
Anti-element R → output terminal D → core wire lThree→ output terminal D '→ second
Switch SW2One fixed contact c2→ Movable contact a2
→ Amplifier AThreeOf the non-inverting input terminal of the
The output terminal 8 of the ridge circuit 1 is output terminal B → core wire lFour→ Output
Terminal B '→ second switch SW2The other fixed contact a 2
→ Amplifier AThreeConnected to the inverting input terminal of the output terminal T
OUTThen, the voltage change of the bridge circuit 1 is taken out.
【００２４】上述の増幅器Ａ3 は入力インピーダンスが
ブリッジ回路の測定インピーダンスに比べて充分に高く
されているので芯線ｌ3 及びｌ4 の合成抵抗２ｒ及び感
温抵抗素子Ｒ（ＲX ＝１００Ω）の抵抗は無視すること
が出来て歪量の測定を行なうことが出来る。Since the input impedance of the above-mentioned amplifier A 3 is sufficiently higher than the measured impedance of the bridge circuit, the combined resistance 2r of the core wires l 3 and l 4 and the temperature-sensitive resistance element R (R X = 100Ω). The resistance can be ignored and the amount of strain can be measured.
【００２５】上述の歪測定時の動作で第３のスイッチＳ
Ｗ3 は可動接片ａ3 及びａ3 が固定接点ｃ3 及びｃ3 の
オープン側に接しているため電流源Ｓ1 から切り離され
る。The third switch S is operated by the above-described operation during distortion measurement.
The movable contact pieces a 3 and a 3 of W 3 are separated from the current source S 1 because the movable contact pieces a 3 and a 3 are in contact with the open sides of the fixed contacts c 3 and c 3 .
【００２６】次に、本例による温度測定時の動作を説明
する。先ず定電流源Ｓ1 を用いてブリッジ回路１によっ
て出力端子Ｄ′及びＢ′間の電圧降下ＶDB並びに入力端
子Ａ′Ｃ′間の電圧降下ＶACを測定する。Next, the operation during temperature measurement according to this example will be described. First, the voltage drop V DB between the output terminals D ′ and B ′ and the voltage drop V AC between the input terminals A′C ′ are measured by the bridge circuit 1 using the constant current source S 1 .
【００２７】先ず図示しない制御回路に基づいて第１の
スイッチＳＷ1 の可動接片ａ1 及びａ1 を固定接点ｂ1
及びｂ1 側に切換えると共に第２のスイッチＳＷ2 の可
動接片ａ2 及びａ2 を固定接点ｃ2 及びｃ2 側に切換
え、更に第３のスイッチＳＷ3の可動接片ａ3 及びａ3
を固定接点ｃ3 及びｃ3 側に切換える。第１のスイッチ
ＳＷ1 の固定接点ｂ1 及びｂ1 は第２のスイッチＳＷ2
の固定接点ｂ2 及びｂ2に接続されてブリッジ回路１の
入力端子Ａ′及びＣ′間はオープン状態に成される。First, based on a control circuit (not shown), the movable contacts a 1 and a 1 of the first switch SW 1 are connected to the fixed contact b 1.
And b 1 side, the movable contacts a 2 and a 2 of the second switch SW 2 are switched to the fixed contacts c 2 and c 2, and the movable contacts a 3 and a 3 of the third switch SW 3 are switched.
To the fixed contacts c 3 and c 3 side. The first fixed contact b 1 of the switch SW 1 and b 1 and the second switch SW 2
Connected to the fixed contacts b 2 and b 2 of the bridge circuit 1 to open the input terminals A ′ and C ′ of the bridge circuit 1.
【００２８】更に、ブリッジ回路１の出力端子Ｄ′及び
Ｂ′間には電流源Ｓ1 →第３のスイッチＳＷ3 の一方の
可動接片ａ3 →固定接点ｂ3 →第２のスイッチＳＷ2 の
一方の可動接片ａ2 →固定接点ｃ2 →出力端子Ｄ′→芯
線ｌ3 →出力端子Ｄ→感温抵抗素子ＲS →出力端９→ブ
リッジ回路１→出力端８→出力端子Ｂ→芯線ｌ4 →出力
端子Ｂ′→第２のスイッチＳＷ2 の他方の固定接点ｃ2
→他方の可動接片ａ2→第３のスイッチＳＷ3 の他方の
固定接点ｂ3 →他方の可動接片ａ3 →接地の系路で定電
流ｉが流され、増幅器Ａ3 の出力端ではＶDB＝（ＲDB＋
ＲX ＋２ｒ）ｉの電圧降下分を測定する。ここでＲDBは
ブリッジ回路１の出力端８及び９間の合成抵抗である。Furthermore, the output terminal D 'and B' between the bridge circuit 1 current source S 1 → one of the movable contact piece of the third switch SW 3 a 3 → the fixed contact b 3 → the second switch SW 2 One movable contact piece a 2 → fixed contact c 2 → output terminal D ′ → core wire l 3 → output terminal D → temperature-sensitive resistance element R S → output end 9 → bridge circuit 1 → output end 8 → output terminal B → core wire l 4 → output terminal B '→ of the second switch SW 2 other fixed contact c 2
→ the other movable contact a 2 → the other fixed contact b 3 of the third switch SW 3 → the other movable contact a 3 → the constant current i is passed through the grounding path, and at the output end of the amplifier A 3. V DB = (R DB +
R X + 2r) i voltage drop is measured. Here, R DB is a combined resistance between the output terminals 8 and 9 of the bridge circuit 1.
【００２９】次に入力端子Ａ′Ｃ′間の電圧降下を測定
するために出力端子Ｄ′Ｂ′間をオープンとし、入力端
子Ａ′及びＣ′間に定電流源Ｓ1 から定電流ｉを供給す
るために図示しない制御回路から第１乃至第３のスイッ
チＳＷ1 乃至ＳＷ3 のすべての可動接片ａ1 乃至ａ3 を
固定接点ｂ1 乃至ｂ3 側に切換える。Next, in order to measure the voltage drop between the input terminals A'C ', the output terminals D'B' are opened, and the constant current i is supplied from the constant current source S 1 between the input terminals A'and C '. In order to supply the voltage, all the movable contact pieces a 1 to a 3 of the first to third switches SW 1 to SW 3 are switched to the fixed contacts b 1 to b 3 by a control circuit (not shown).
【００３０】即ち、定電流源Ｓ1 からの定電流は第３の
スイッチＳＷ3 の一方の可動接片ａ 3 →固定接点ｂ3 →
第２のスイッチＳＷ2 の一方の可動接片ａ2 →一方の固
定接点ｂ2 →第１のスイッチＳＷ2 の一方の固定接点ｂ
1 →可動接片ａ1 →入力端子Ａ′→芯線ｌ1 →入力端子
Ａ→入力端６→ブリッジ回路１→入力端７→入力端子Ｃ
→芯線ｌ2 →入力端子Ｃ′→第１のスイッチＳＷ1 の他
方の可動接片ａ1 →他方の固定接点ｂ1 →第２のスイッ
チＳＷ2 の他方の固定接点ｂ2 →他方の可動接片ａ2 →
第３のスイッチＳＷ3 の他方の固定接点ｂ3 →他方の可
動接片ａ3 →接地の系路で入力端子Ａ′−Ｃ′間の電圧
降下ＶACを測定する。この場合の電圧降下はＶAC＝（Ｒ
AC＋２ｒ）ｉである。ここでＲACはブリッジ回路１の入
力端６及び７間の合成抵抗である。That is, the constant current source S1The constant current from the third
Switch SWThreeOne movable contact a Three→ Fixed contact bThree→
Second switch SW2One movable contact a2→ one of the solid
Constant contact b2→ 1st switch SW2One fixed contact b
1→ Movable contact a1→ input terminal A '→ core wire l1→ Input terminal
A → input terminal 6 → bridge circuit 1 → input terminal 7 → input terminal C
→ Core wire l2→ input terminal C '→ first switch SW1Other
One movable contact a1→ The other fixed contact b1→ The second switch
Ji SW2The other fixed contact b2→ The other movable contact a2→
Third switch SWThreeThe other fixed contact bThree→ Other possible
Moving contact piece aThree→ The voltage between input terminals A'-C 'in the grounding path
Descent VACTo measure. The voltage drop in this case is VAC= (R
AC+ 2r) i. Where RACIs the bridge circuit 1
The combined resistance between the force ends 6 and 7.
【００３１】次にセンサ部２の出力端子ＤＢ間に直列接
続された感温抵抗素子Ｒの電圧降下ＶRXを求める。この
感温抵抗素子Ｒの両端の電圧降下はＶRX＝ＶAC−ＶDBと
して求められる。感温抵抗素子Ｒの抵抗値ＲX は既知の
定電流源Ｓ1 の電流ｉからＲ X ＝ＶRX／ｉとして求めら
れる。即ち、ＶRX＝ＶDB−ＶACはＶRX＝（ＲDB＋ＲX ＋
２ｒ）ｉ−（ＲAC＋２ｒ）となる。ここでブリッジ回路
１の隣辺抵抗和は一定であることから ＲAC＝ＲDB となってＲAC及びＲDB並びに２ｒ成分は互いにキャンセ
ルされ ＶRX＝ＲX ｉと成る。ここでｉは既知の定電流源Ｓ1 の
定電流であるから感温抵抗素子Ｒの抵抗値Ｒ X を求める
ことが出来る。Next, a series connection is made between the output terminals DB of the sensor section 2.
Voltage drop V of the temperature-sensitive resistance element R continuedRXAsk for. this
The voltage drop across the temperature sensitive resistor R is VRX= VAC-VDBWhen
Is required. Resistance value R of temperature-sensitive resistance element RXIs known
Constant current source S1Current i to R X= VRXCalculated as / i
It is. That is, VRX= VDB-VACIs VRX= (RDB+ RX+
2r) i- (RAC+ 2r). Bridge circuit here
Since the sum of resistances on the adjacent side of 1 is constant, RAC= RDB Become RACAnd RDBAnd the 2r components cancel each other.
VRX= RXi. Where i is a known constant current source S1of
Since it is a constant current, the resistance value R of the temperature sensitive resistance element R XAsk for
You can
【００３２】次に、図示しない制御回路のコンピュータ
でＡ／Ｄ変換した抵抗値から逆リニアライズして温度に
変換する。例えばＲX ＝１００Ω，ｉ＝０．３ｍＡの抵
抗値の温度は下記の通りである。 ０．１℃の分解能を得るには定電流ｉ＝０．３ｍＡで電
圧分解能は０．０１ｍＶ以上が必要となる。Next, the resistance value A / D converted by a computer of a control circuit (not shown) is inversely linearized and converted into temperature. For example, the temperature of the resistance value of R x = 100Ω and i = 0.3 mA is as follows. To obtain a resolution of 0.1 ° C., a constant current i = 0.3 mA and a voltage resolution of 0.01 mV or more are required.
【００３３】上述の構成では１個の定電流源Ｓ1 を用い
て歪及び温度の測定を行なったが図２に示す様に歪測定
時と温度測定時に別々の定電流源Ｓ2 〜Ｓ3 を用いて夫
々駆動することも出来る。図２で図１との対応部分には
同一符号を付して重複説明を省略するも第１のスイッチ
ＳＷ1 の一方の固定接点ｃ1 には歪測定用の一端を接地
した定電流源Ｓ2 を接続し、第３のスイッチＳＷ3 の可
動接片ａ3 及びａ3 には一端を接地した夫々定電流源Ｓ
3 及びＳ4 を接続する。勿論定電流源Ｓ3 及びＳ4 を１
つの定電流源としても本例の上述した方法で歪及び温度
の測定が可能である。In the above structure, the strain and temperature are measured by using one constant current source S 1. However, as shown in FIG. 2, the constant current sources S 2 to S 3 are separately measured at the time of strain measurement and temperature measurement. Can also be driven by using. In FIG. 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals and duplicate description is omitted, but one fixed contact c 1 of the first switch SW 1 has a constant current source S whose one end for strain measurement is grounded. 2 and the movable contact pieces a 3 and a 3 of the third switch SW 3 each have a constant current source S whose one end is grounded.
Connect 3 and S 4 . Of course, set the constant current sources S 3 and S 4 to 1
The strain and temperature can be measured by the above-mentioned method of this example also as one constant current source.
【００３４】尚、上述の構成の動作ではスイッチを機械
的なスイッチとして説明したが、リレーや半導体スイッ
チング素子を用い得ることは勿論である。Although the switch has been described as a mechanical switch in the operation of the above configuration, it goes without saying that a relay or a semiconductor switching element can be used.
【００３５】[0035]
【発明の効果】本発明の変位及び温度等の物理量測定装
置及びその測定方法によれば、１つの定電流源を用い
て、キャンセル電流等を延長コード部に流さずに被測定
物の温度や歪の測定が可能なので簡単な構成で廉価なも
のが得られる。According to the physical quantity measuring apparatus for measuring displacement and temperature and the method for measuring the same according to the present invention, the temperature of the object to be measured and the temperature of the object to be measured can be controlled by using one constant current source without causing the canceling current to flow through the extension cord portion. Since the strain can be measured, a simple structure and an inexpensive one can be obtained.
【図１】本発明の変位及び温度等の物理量測定装置の一
実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of a physical quantity measuring device for measuring displacement and temperature according to the present invention.
【図２】本発明の変位及び温度等の物理量測定装置の他
の実施例を示す回路図である。FIG. 2 is a circuit diagram showing another embodiment of the physical quantity measuring apparatus for measuring displacement and temperature according to the present invention.
【図３】従来の変位及び温度等の物理量測定装置の歪測
定時の等価回路図である。FIG. 3 is an equivalent circuit diagram of a conventional physical quantity measuring apparatus for measuring displacement and temperature when measuring strain.
【図４】従来の変位及び温度等の物理量測定装置の温度
測定時の等価回路図である。FIG. 4 is an equivalent circuit diagram of a conventional physical quantity measuring device for measuring displacement and temperature when measuring temperature.
１ ブリッジ回路 ２ センサ部 ３ 延長コード部 ４ 測定装置本体 ５ 変位及び温度測定装置 1 bridge circuit 2 sensor part 3 extension cord part 4 measuring device body 5 displacement and temperature measuring device
Claims (2)
の一方の出力端に感温抵抗素子を直列に接続したセンサ
部と、上記ブリッジ回路の出力端側に接続可能に成され
た増幅器と、 上記ブリッジ回路の入出力端側に接続可能に成された定
電流源とを有する測定装置本体とを有し、 上記センサ部による測温時に上記ブリッジ回路の入力側
抵抗と出力側抵抗を夫々求めた出力側抵抗値から入力側
抵抗値を差し引くことで上記感温抵抗素子の抵抗値を求
め、該抵抗値から演算により温度に変換することを特徴
とする物理量測定装置。1. A sensor unit in which a temperature sensitive resistance element is connected in series to one output end of a bridge circuit for converting a displacement amount into an electric amount, and an amplifier connectable to the output end side of the bridge circuit. A measuring device main body having a constant current source connectable to the input / output end side of the bridge circuit, and the input side resistance and the output side resistance of the bridge circuit are respectively measured during temperature measurement by the sensor unit. A physical quantity measuring device characterized in that the resistance value of the temperature-sensitive resistance element is obtained by subtracting the input resistance value from the obtained output resistance value, and the resistance value is converted into temperature by calculation.
の出力端に感温抵抗素子を直列に接続させたセンサによ
って変位及び温度等の物理量を測定する測定方法に於い
て、 上記ブリッジ回路の入力側抵抗と出力側抵抗を夫々求め
た出力側抵抗値から入力側抵抗値を差し引くことでセン
サ内の上記感温抵抗素子の抵抗値変化を求め、該抵抗値
から演算により温度に変換して温度測定して成ることを
特徴とする物理量測定方法。2. A measuring method for measuring a physical quantity such as displacement and temperature by a sensor in which a temperature sensitive resistance element is connected in series to an output end of a bridge circuit for converting a displacement quantity into an electric quantity. The resistance value change of the temperature-sensitive resistance element in the sensor is obtained by subtracting the input resistance value from the output resistance value obtained for the input resistance and the output resistance respectively, and converted to temperature by calculation from the resistance value. A method for measuring a physical quantity, characterized by comprising measuring a temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23291295A JPH0979875A (en) | 1995-09-11 | 1995-09-11 | Physical quantity measuring device and its measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23291295A JPH0979875A (en) | 1995-09-11 | 1995-09-11 | Physical quantity measuring device and its measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0979875A true JPH0979875A (en) | 1997-03-28 |
Family
ID=16946792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23291295A Pending JPH0979875A (en) | 1995-09-11 | 1995-09-11 | Physical quantity measuring device and its measuring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0979875A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018021868A (en) * | 2016-08-05 | 2018-02-08 | 株式会社デンソー | Sensor device |
-
1995
- 1995-09-11 JP JP23291295A patent/JPH0979875A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018021868A (en) * | 2016-08-05 | 2018-02-08 | 株式会社デンソー | Sensor device |
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