JPH0341794B2 - - Google Patents
Info
- Publication number
- JPH0341794B2 JPH0341794B2 JP57013860A JP1386082A JPH0341794B2 JP H0341794 B2 JPH0341794 B2 JP H0341794B2 JP 57013860 A JP57013860 A JP 57013860A JP 1386082 A JP1386082 A JP 1386082A JP H0341794 B2 JPH0341794 B2 JP H0341794B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- temperature
- output
- heater
- switching element
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
- Measuring Magnetic Variables (AREA)
Description
【発明の詳細な説明】 本発明は磁気検出器に関する。[Detailed description of the invention] The present invention relates to magnetic detectors.
磁気検出器として広く用いられているフラツク
スゲート形磁気検出器は、磁気コアを備えている
が、この磁気コアのＨ−Ｂ特性に、きわめて微小
量ながら原点のゆらぎ現像のあることが知られて
いる。このゆらぎの原因は正確には究明されてい
ないが、環境の温度変化がその要因のひとつであ
ることが知られている。そのため、例えば航空機
による潜水艦の探査、地中埋蔵金属の探査、地磁
気の異常変化など磁気の微小な変化を検出しよう
とすれば、磁気センサーの温度を一定に制御する
ことが重要にある。 Fluxgate type magnetic detectors, which are widely used as magnetic detectors, are equipped with a magnetic core, but it is known that the H-B characteristics of this magnetic core have an extremely small amount of fluctuation in the origin. ing. Although the exact cause of this fluctuation has not been determined, it is known that environmental temperature changes are one of the causes. For this reason, it is important to control the temperature of the magnetic sensor at a constant level when attempting to detect minute changes in magnetism, such as when searching for submarines by aircraft, searching for underground metals, or abnormal changes in the earth's magnetic field.
ところが、このフラツクスゲート形磁気検出器
の温度効果は不確定要因が多く、設計的に所定の
温度特性の温度補償素子を用いて補償することは
殆んど不可能であり、さらに、温度制御用ヒータ
等から発生するノイズがきわめて僅かながら磁気
センサーに影響を与えるので、高感度の磁気検出
器には温度制御装置が使用できないという問題が
あつた。 However, the temperature effect of this fluxgate type magnetic detector has many uncertain factors, and it is almost impossible to compensate for it using a temperature compensation element with a predetermined temperature characteristic in terms of design. There was a problem in that a temperature control device could not be used with a highly sensitive magnetic detector because the noise generated from the heater etc. had a very small effect on the magnetic sensor.
本発明はこのような問題を解決し、磁気測定に
影響を与えることなく温度を所定値に制御し、セ
ンサーのゆらぎ現像を可及的に小さく抑えた磁気
検出器の提供を目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a magnetic detector in which the temperature is controlled to a predetermined value without affecting magnetic measurement, and the fluctuation of the sensor is suppressed as much as possible.
以下、本発明の実施例を説明する。 Examples of the present invention will be described below.
第１図に本発明実施例の回路ブロツク図を示
す。磁気検出センサー部１の出力は増幅器２を経
てサンプルホールド回路３に導入される。サンプ
ルホールド回路３は間欠的にオンして増幅器２の
出力を取り込むスイツチS1、取り込まれた出力信
号を充電して保持するコンデンサＣ、及び高入力
インピーダンスの増幅器AMから構成されてお
り、この増幅器AMの出力が磁気検出器の出力
H0となる。一方、磁気検出センサー部１の近傍
に配設された温度センサー４の出力は、偏差検出
器５に入力され、ここで設定温度Ｔと比較され
て、その偏差が増幅器６を経てヒータ７を付勢す
る。増幅器６とヒータ７の間にはスイツチS2が直
列接続されてヒータ７の駆動を制御し得るように
なつている。タイミングパルス発生器８は所定周
期ごとにパルス信号を発生し、スイツチS1は常閉
スイツチであつてパルス信号Ｐが発生している間
だけオフとなり、スイツチS2は常開スイツチであ
つてパルス信号Ｐが発生している間だけオンにな
る。 FIG. 1 shows a circuit block diagram of an embodiment of the present invention. The output of the magnetic detection sensor section 1 is introduced into a sample and hold circuit 3 via an amplifier 2. The sample and hold circuit 3 is composed of a switch S 1 that is intermittently turned on to capture the output of the amplifier 2, a capacitor C that charges and holds the captured output signal, and an amplifier AM with high input impedance. AM output is magnetic detector output
H becomes 0 . On the other hand, the output of a temperature sensor 4 disposed near the magnetic detection sensor section 1 is input to a deviation detector 5, where it is compared with a set temperature T, and the deviation is passed through an amplifier 6 to a heater 7. to strengthen A switch S2 is connected in series between the amplifier 6 and the heater 7 to control the driving of the heater 7. The timing pulse generator 8 generates a pulse signal at predetermined intervals, the switch S1 is a normally closed switch and is turned off only while the pulse signal P is being generated, and the switch S2 is a normally open switch that does not generate a pulse signal. It is turned on only while signal P is generated.
第２図に上記実施例における各部の波形図を示
す。図においてＰはパルス信号、Hnはヒータ７
の動作時に発生するノイズHsは測定すべき磁気
信号、Hoは当該磁気検出器の出力信号である。
パルス信号Ｐが発生している間だけスイツチS2が
オンになつてヒータ７が駆動されるから、ヒータ
７の作動により図示のようなノイズHnが発生す
るものとする。従つて、磁気センサー１は測定す
べき磁気信号HsSとノイズHnの重畳されたもの
を出力するが、スイツチS1がパルス信号Ｐの発生
している間だけオフになるから、この間はサンプ
ルホールド回路３のコンデンサＣに記憶されてい
るスイツチS1がオフになる直前の信号が出力Ho
に導出され、磁気信号Hsに重畳されたノイズHn
は取り込まれない。 FIG. 2 shows a waveform diagram of each part in the above embodiment. In the figure, P is the pulse signal, Hn is the heater 7
The noise Hs generated during operation is the magnetic signal to be measured, and Ho is the output signal of the magnetic detector.
Since the switch S2 is turned on and the heater 7 is driven only while the pulse signal P is being generated, it is assumed that the operation of the heater 7 generates noise Hn as shown in the figure. Therefore, the magnetic sensor 1 outputs a superimposed magnetic signal HsS to be measured and noise Hn, but since the switch S1 is turned off only while the pulse signal P is generated, the sample and hold circuit is turned off during this time. The signal stored in the capacitor C of No. 3 just before switch S1 turns off is the output Ho.
The noise Hn derived from the magnetic signal Hs and superimposed on the magnetic signal Hs
is not imported.
本発明のサンプルホールド装置は、従来のアナ
ログ回路によるサンプルホールド回路に限定され
るものでなく、例えば、Ａ−Ｄ変換器、デジタル
メモリ、及びＤ−Ａ変換器の組合せにより構成し
うる実質的にサンプルホールド機能をもつ装置に
置換して実施することができる。 The sample-and-hold device of the present invention is not limited to a sample-and-hold circuit using a conventional analog circuit, but can be substantially configured by, for example, a combination of an A-D converter, a digital memory, and a D-A converter. It can be implemented by replacing it with a device that has a sample hold function.
本発明によれば、磁気測定に影響を与えること
なく温度を一定値に制御することができるので、
磁気検出器の感度及び精度が向上し、従来不可能
とされていた微小な磁気変化をも検出することが
可能になつた。 According to the present invention, the temperature can be controlled to a constant value without affecting magnetic measurement.
The sensitivity and accuracy of magnetic detectors have improved, making it possible to detect minute magnetic changes that were previously considered impossible.
第１図は本発明の実施例を示す回路ブロツク
図、第２図は第１図実施例の作用を説明する波形
図である。
１……磁気検出センサー部、２……サンプルホ
ールド回路、４……温度センサー、７……ヒー
タ、８……タイミングパルス信号発生器、S1，S2
……スイツチ。
FIG. 1 is a circuit block diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram explaining the operation of the embodiment of FIG. DESCRIPTION OF SYMBOLS 1... Magnetic detection sensor section, 2... Sample hold circuit, 4... Temperature sensor, 7... Heater, 8... Timing pulse signal generator, S 1 , S 2
...Switch.
Claims (1)
力を保持することができ、且つ保持すべき信号の
導入線に第一のスイツチング要素を備えたサンプ
ルホールド装置と、温度センサーによる測定値が
設定温度以下になつたときヒータを駆動する温度
制御装置と、上記温度センサーと上記ヒータの間
に介在する第二のスイツチング要素と、上記第一
のスイツチング要素と上記第二のスイツチング要
素を交互にオンにするタイミング制御手段とを有
し、上記ヒータが作動中に磁気センサーの出力を
測定値として取り込まないよう構成された磁気検
出器。1. A magnetic detection sensor section, a sample hold device capable of holding the output of the sensor section and equipped with a first switching element on the lead-in line of the signal to be held, and a sample hold device capable of holding the output of the sensor section, and a sample hold device that is capable of holding the output of the sensor section and equipped with a first switching element on the lead-in line of the signal to be held, and a temperature sensor whose measured value is below the set temperature. a temperature control device that drives the heater when the temperature is reached, a second switching element interposed between the temperature sensor and the heater, and alternately turning on the first switching element and the second switching element. and a timing control means, the magnetic detector configured not to take in the output of the magnetic sensor as a measurement value while the heater is in operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57013860A JPS58129373A (en) | 1982-01-29 | 1982-01-29 | Magnetism detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57013860A JPS58129373A (en) | 1982-01-29 | 1982-01-29 | Magnetism detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58129373A JPS58129373A (en) | 1983-08-02 |
| JPH0341794B2 true JPH0341794B2 (en) | 1991-06-25 |
Family
ID=11845012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57013860A Granted JPS58129373A (en) | 1982-01-29 | 1982-01-29 | Magnetism detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58129373A (en) |
-
1982
- 1982-01-29 JP JP57013860A patent/JPS58129373A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58129373A (en) | 1983-08-02 |
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