JPH0125294Y2 - - Google Patents
Info
- Publication number
- JPH0125294Y2 JPH0125294Y2 JP1331582U JP1331582U JPH0125294Y2 JP H0125294 Y2 JPH0125294 Y2 JP H0125294Y2 JP 1331582 U JP1331582 U JP 1331582U JP 1331582 U JP1331582 U JP 1331582U JP H0125294 Y2 JPH0125294 Y2 JP H0125294Y2
- Authority
- JP
- Japan
- Prior art keywords
- output signal
- difference calculation
- calculation circuit
- circuit
- switching
- 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
- 238000001514 detection method Methods 0.000 claims description 29
- 230000005284 excitation Effects 0.000 claims description 11
- 230000001939 inductive effect Effects 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000004092 self-diagnosis Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Details Of Flowmeters (AREA)
- Measuring Volume Flow (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
【考案の詳細な説明】
本考案は、誘導式測定器に関するものであつ
て、検出コイルおよび検出コイルの出力信号を増
幅する増幅器の故障が識別できる自己診断形誘導
式測定器を提供するものである。[Detailed description of the invention] The present invention relates to an inductive measuring instrument, and provides a self-diagnosis type inductive measuring instrument that can identify failures in a detection coil and an amplifier that amplifies the output signal of the detection coil. be.
流速や温度、変位等を測定する測定器の一種
に、励磁コイルと検出コイルとを組み合わせた誘
導式測定器がある。 One type of measuring device that measures flow velocity, temperature, displacement, etc. is an induction type measuring device that combines an excitation coil and a detection coil.
第１図は、このような誘導式測定器の具体例を
示す構成説明図であつて、ａは渦電流式流速計の
例を示し、ｂは渦電流式変位計の例を示し、ｃは
差動トランス式測定器の例を示している。これら
図面において、１は励磁電源、２は励磁コイル、
３，４は検出コイル、５，６は増幅器、７は差演
算回路、８は和演算回路、９は温度補償回路、１
０は導電性を有する被測定流体の流れ方向、１１
は導電性を有する被測定対象、１２はコア、１３
は変位伝達機構、T1〜T4は出力端子である。ａ
の構成によれば出力端子T1には流速信号が送出
されて出力端子T2には温度信号が送出され、ｂ
の構成によれば出力端子T3には被測定対象１１
と検出コイル３との間の距離ｘに関連した変位信
号が送出され、ｃの構成によれば変位伝達機構１
３を介してコア１２に伝達される被測定対象の変
位、圧力、差圧、力等に関連した変位信号が送出
される。 FIG. 1 is a configuration explanatory diagram showing a specific example of such an induction type measuring instrument, in which a shows an example of an eddy current type current meter, b shows an example of an eddy current type displacement meter, and c shows an example of an eddy current type displacement meter. An example of a differential transformer type measuring instrument is shown. In these drawings, 1 is an excitation power source, 2 is an excitation coil,
3 and 4 are detection coils, 5 and 6 are amplifiers, 7 is a difference calculation circuit, 8 is a sum calculation circuit, 9 is a temperature compensation circuit, 1
0 is the flow direction of the conductive fluid to be measured, 11
is a conductive object to be measured, 12 is a core, 13
is a displacement transmission mechanism, and T 1 to T 4 are output terminals. a
According to the configuration, a flow velocity signal is sent to the output terminal T1 , a temperature signal is sent to the output terminal T2 , and b
According to the configuration, the object to be measured 11 is connected to the output terminal T3 .
A displacement signal related to the distance x between the detection coil 3 and the detection coil 3 is sent out, and according to the configuration c
A displacement signal related to the displacement, pressure, differential pressure, force, etc. of the object to be measured is transmitted to the core 12 via the core 12.
ところで、このような誘導式測定器における故
障の態様として、励磁電源１の故障、励磁コイル
２の断線、検出コイル３，４の断線、増幅器５，
６の故障、差演算回路７の故障、和演算回路８の
故障、温度補償回路９の故障等が考えられる。こ
のような装置が故障した場合、どの部分が故障し
たのかが識別できると、修理がやりやすくなる。
本考案の出願人は、励磁コイル２および検出コイ
ル３，４の断線検出に関する考案を実願昭54−
175799号として出願している。しかし、この先願
考案では、検出コイル３，４の故障か増幅器５，
６の故障かを識別することはできない。 By the way, failures in such induction measuring instruments include failure of the excitation power supply 1, disconnection of the excitation coil 2, disconnection of the detection coils 3 and 4, and failure of the amplifier 5,
6, a failure in the difference calculation circuit 7, a failure in the sum calculation circuit 8, a failure in the temperature compensation circuit 9, etc. If such a device breaks down, it will be easier to repair it if it is possible to identify which part has broken down.
The applicant of the present invention proposed a device for detecting disconnection of the excitation coil 2 and the detection coils 3 and 4 in 1974-
It has been filed as No. 175799. However, in this prior application, the amplifier 5,
It is not possible to identify whether this is a failure of No. 6 or not.
本考案は、このような従来の欠点を解決したも
のであつて、検出コイル３，４と増幅器５，６と
の間に検出コイル３，４の出力信号を相補的に選
択送出する第１，第２の切換回路を設けて増幅器
５，６への入力を相補的に切り換えるようにする
と共に増幅器５，６の出力信号の差を演算する差
演算回路を設け、切換回路の切換選択による差演
算回路の出力信号の極性変化の有無から検出コイ
ル３，４および増幅器５，６の故障を検出するこ
とを特徴とする。 The present invention solves these conventional drawbacks, and includes a first, second, and second detector that selectively and selectively transmits the output signals of the detection coils 3 and 4 between the detection coils 3 and 4 and the amplifiers 5 and 6. A second switching circuit is provided to switch the inputs to the amplifiers 5 and 6 in a complementary manner, and a difference calculation circuit for calculating the difference between the output signals of the amplifiers 5 and 6 is provided, and the difference calculation is performed by selecting the switching circuit. It is characterized by detecting a failure in the detection coils 3, 4 and the amplifiers 5, 6 from the presence or absence of a polarity change in the output signal of the circuit.
以下、図面を用いて、詳細に説明する。 Hereinafter, a detailed explanation will be given using the drawings.
第２図は、本考案の一実施例を示す構成説明図
であつて、第１図と同等部分には同一符号を付し
ている。第２図において、１４，１５は切換回
路、１６は差演算回路、T5は出力端子である。 FIG. 2 is a configuration explanatory diagram showing an embodiment of the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In FIG. 2, 14 and 15 are switching circuits, 16 is a difference calculation circuit, and T5 is an output terminal.
切換回路１４，１５は、各検出コイル３，４の
出力信号eaおよびebを相補的に選択して送出する
ものであつて、切換回路１４から検出コイル３の
出力信号eaが送出されると切換回路１５からは検
出コイル４の出力信号ebが送出され、切換回路１
４から検出コイル４の出力信号ebが送出されると
切換回路１５からは検出コイル３の出力信号eaが
送出される。差演算回路１６は、増幅器５の出力
信号E1と増幅器６の出力信号E2との差演算を行
い、出力信号E0を出力端子T5に送出する。 The switching circuits 14 and 15 select and send complementary output signals e a and e b of the respective detection coils 3 and 4, and the output signal e a of the detection coil 3 is sent out from the switching circuit 14. Then, the output signal e b of the detection coil 4 is sent from the switching circuit 15, and the switching circuit 1
When the output signal e b of the detection coil 4 is sent out from the switching circuit 15 , the output signal e a of the detection coil 3 is sent out from the switching circuit 15 . The difference calculation circuit 16 calculates the difference between the output signal E 1 of the amplifier 5 and the output signal E 2 of the amplifier 6, and sends the output signal E 0 to the output terminal T 5 .
このように構成された装置の動作について説明
する。 The operation of the device configured in this way will be explained.
通常動作時には、切換回路１４からは検出コイ
ル３の出力信号eaが送出され、切換回路１５から
は検出コイル４の出力信号ebが送出されている。
これにより、差演算回路１６の出力信号E0は、
E0＝E2−E1
＝eb−ea
となる。ここで、出力信号E0がプラス側に振り
切れたとすると、故障態様としては、(i)E1＝０
に相当する検出コイル３の断線または(ii)出力信号
E0がプラス側に振り切れてしまうような増幅器
５，６あるいは差演算回路１６の故障のいずれか
が考えられる。一方、出力信号E0がマイナス側
に振り切れたとすると、故障態様としては、(iii)
E2＝０に相当する検出コイル４の断線または(iv)
出力信号E0がマイナス側に振り切れてしまうよ
うな増幅器５，６あるいは差演算回路１６の故障
のいずれかが考えられる。通常動作時、このよう
な異常動作が現われた場合には、切換回路１４，
１５の選択動作を切り換え、切換回路１４からは
検出コイル４の出力信号ebを送出し、切換回路１
５からは検出コイル３の出力信号eaを送出するよ
うにする。このように切換回路１４，１５の選択
動作を通常動作状態から切り換えることにより、
故障態様が(i)または(iii)の場合には出力信号E0は
逆極性側に振り切れることになり、故障態様が(ii)
または(iv)の場合には極性は変化することなく振り
切れたままとなる。 During normal operation, the switching circuit 14 sends out the output signal e a of the detection coil 3 , and the switching circuit 15 sends out the output signal e b of the detection coil 4 .
As a result, the output signal E 0 of the difference calculation circuit 16 becomes E 0 =E 2 -E 1 =e b -e a . Here, if the output signal E 0 swings completely to the positive side, the failure mode is (i) E 1 = 0
Disconnection of detection coil 3 corresponding to (ii) Output signal
It is conceivable that either the amplifiers 5, 6 or the difference calculation circuit 16 is malfunctioning so that E 0 swings to the positive side. On the other hand, if the output signal E 0 swings completely to the negative side, the failure mode is (iii)
Disconnection of detection coil 4 corresponding to E 2 = 0 or (iv)
There may be a failure in either the amplifiers 5, 6 or the difference calculation circuit 16, which causes the output signal E0 to swing to the negative side. If such an abnormal operation occurs during normal operation, the switching circuit 14,
15, the switching circuit 14 sends out the output signal e b of the detection coil 4, and the switching circuit 1
5 outputs the output signal e a of the detection coil 3. By switching the selection operation of the switching circuits 14 and 15 from the normal operating state in this way,
If the failure mode is (i) or (iii), the output signal E 0 will swing to the opposite polarity side, and the failure mode will be (ii).
Or in the case of (iv), the polarity remains unchanged without changing.
これらから明らかなように、切換回路１４，１
５の選択動作を切り換えた時の出力信号E0の極
性変化の有無から、検出コイル３，４および増幅
器５，６あるいは差演算回路１６の故障を検出す
ることができる。 As is clear from these, the switching circuits 14, 1
A failure in the detection coils 3, 4, the amplifiers 5, 6, or the difference calculation circuit 16 can be detected from the presence or absence of a change in the polarity of the output signal E0 when the selection operation of 5 is switched.
なお、前述先願と本考案とを併用することによ
り、励磁系統の故障も検出することができる。 Note that by using the above-mentioned prior application and the present invention together, it is also possible to detect failures in the excitation system.
以上説明したように、本考案によれば、検出コ
イルおよび検出コイルの出力信号を増幅する増幅
器の故障が識別できる自己診断形誘導式測定器が
実現でき、実用上の効果は大きい。 As described above, according to the present invention, a self-diagnosis type inductive measuring instrument that can identify failures in the detection coil and the amplifier that amplifies the output signal of the detection coil can be realized, and has great practical effects.
第１図は誘導式測定器の具体例を示す構成説明
図、第２図は本考案の一実施例を示す構成説明図
である。
１…励磁電源、２…励磁コイル、３，４…検出
コイル、５，６…増幅器、１４，１５…切換回
路、１６…差演算回路。
FIG. 1 is a structural explanatory diagram showing a specific example of an inductive measuring instrument, and FIG. 2 is a structural explanatory diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Excitation power supply, 2... Excitation coil, 3, 4... Detection coil, 5, 6... Amplifier, 14, 15... Switching circuit, 16... Difference calculation circuit.
Claims (1)
第１、第２の検出コイルと、各検出コイルの出力
信号を相補的に選択して送出する第１、第２の切
換回路と、各切換回路の出力信号をそれぞれ増幅
する第１、第２の増幅器と、これら増幅器の出力
信号の差を演算する差演算回路とを設け、前記各
切換回路の切換選択による差演算回路の出力信号
の極性変化の有無から前記各検出コイルおよび各
増幅器または差演算回路の故障を検出するように
したことを特徴とする自己診断形誘導式測定器。 An excitation coil, first and second detection coils arranged on both sides of the excitation coil, first and second switching circuits that select and send output signals of each detection coil in a complementary manner, and each switching circuit. and a difference calculation circuit that calculates the difference between the output signals of these amplifiers, and the polarity of the output signal of the difference calculation circuit is changed by switching selection of each switching circuit. A self-diagnosis type inductive measuring instrument characterized in that a failure of each of the detection coils, each of the amplifiers, or the difference calculation circuit is detected from the presence or absence of .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1331582U JPS58116626U (en) | 1982-02-02 | 1982-02-02 | Self-diagnostic inductive measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1331582U JPS58116626U (en) | 1982-02-02 | 1982-02-02 | Self-diagnostic inductive measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58116626U JPS58116626U (en) | 1983-08-09 |
| JPH0125294Y2 true JPH0125294Y2 (en) | 1989-07-28 |
Family
ID=30025836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1331582U Granted JPS58116626U (en) | 1982-02-02 | 1982-02-02 | Self-diagnostic inductive measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58116626U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4542973B2 (en) * | 2005-09-15 | 2010-09-15 | 株式会社東芝 | Moving distance measuring device and moving distance measuring method |
-
1982
- 1982-02-02 JP JP1331582U patent/JPS58116626U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58116626U (en) | 1983-08-09 |
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