JPS63124600A - Method of shielding faint current amplifying circuit - Google Patents
Method of shielding faint current amplifying circuitInfo
- Publication number
- JPS63124600A JPS63124600A JP26968086A JP26968086A JPS63124600A JP S63124600 A JPS63124600 A JP S63124600A JP 26968086 A JP26968086 A JP 26968086A JP 26968086 A JP26968086 A JP 26968086A JP S63124600 A JPS63124600 A JP S63124600A
- Authority
- JP
- Japan
- Prior art keywords
- shielding
- weak current
- amplifying circuit
- current amplifying
- shield case
- 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
- 238000000034 method Methods 0.000 title claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
Landscapes
- Details Of Measuring And Other Instruments (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、微弱電流増幅回路シールド方法に係り、比較
的安価な方法で静電ノイズ電磁ノイズを同時にシールド
する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for shielding a weak current amplifier circuit, and more particularly, to a method for simultaneously shielding electrostatic noise and electromagnetic noise using a relatively inexpensive method.
一般に、放射線計測等に用いられる微弱電流回路の構成
は、例えば特公昭５７−６１３７号公報の対数増幅器に
示されるようなものであり、その最小入力電流は、 １
０−”’ ［Ａ］程度であり、特に回路のシールド方法
については、十分な検討がなされていなかった。Generally, the configuration of a weak current circuit used for radiation measurement etc. is as shown in the logarithmic amplifier disclosed in Japanese Patent Publication No. 57-6137, and its minimum input current is 1
It is about 0-''' [A], and sufficient consideration has not been made, especially regarding the method of shielding the circuit.
しかし、１０′″” Ａ程度の極めて微弱な電流を増幅
させようとすると静電的あるいは電磁的ノイズに対する
回路のシールド方法が重要となる。しかしながら、従来
方法においては、このシールド方法について特に考慮が
なされていなかった。However, when attempting to amplify an extremely weak current of about 10'''' A, a method of shielding the circuit against electrostatic or electromagnetic noise becomes important. However, in the conventional method, no particular consideration was given to this shielding method.
本発明は以上の点に鑑みなされたものであり。The present invention has been made in view of the above points.
その目的とするところは、放射線検出器等から出力され
る１０′″１４ Ａ程度と極めて微弱な電流を安定に増
幅できるシールド方法を安価に提供するところにある。The purpose is to provide at low cost a shielding method that can stably amplify an extremely weak current of about 10''''14 A output from a radiation detector or the like.
上記目的は、微弱電流増幅回路を、鉄シールド材と銅シ
ールド材の二つのシールド材で、シールドするとともに
、両者を接地することにより、達成される。The above object is achieved by shielding the weak current amplification circuit with two shielding materials, an iron shielding material and a copper shielding material, and by grounding both.
１０−１’ ［Ａ］以下と極めて微弱な電流を増幅する
際、上述のように微弱電流増幅回路をシールドすること
により、静電的あるいは電磁的なノイズの影響を問題に
ならない程小さくできる。When amplifying an extremely weak current of 10-1' [A] or less, by shielding the weak current amplification circuit as described above, the influence of electrostatic or electromagnetic noise can be made so small that it does not become a problem.
以下、本発明の具体的実施例について図面を用いて詳細
に説明する。Hereinafter, specific embodiments of the present invention will be described in detail using the drawings.
図に本発明の一実施例を示す。The figure shows an embodiment of the present invention.
静電ノイズを防止するには、抵抗率の低い材料でシール
ドすれば高い効果が得られるが、比較的安価で、抵抗率
が低い銅が一般に用いられる。また、電磁ノイズは、比
透磁率の高い材料を用いてシールドすれば、シールドの
効果が高く、安価で比較的比透磁率が高い鉄が一般に用
いられる。To prevent electrostatic noise, shielding with a material with low resistivity can be highly effective, but copper, which is relatively inexpensive and has low resistivity, is generally used. Further, electromagnetic noise can be effectively shielded by using a material with a high relative magnetic permeability, and iron, which is inexpensive and has a relatively high relative magnetic permeability, is generally used.
特に、放射線計測においては、高電圧が印加される放射
線検出器の出力段に接続される微弱電流増幅回路は、放
射線検出器と物理的に近い距離に設置される。このため
、特に静電ノイズの対策が重要となる。鉄は、電磁シー
ルドばかりでなく。In particular, in radiation measurement, a weak current amplification circuit connected to the output stage of a radiation detector to which a high voltage is applied is installed physically close to the radiation detector. Therefore, countermeasures against electrostatic noise are particularly important. Iron is not only good for electromagnetic shielding.
接地すれば鋼程ではないが静電ノイズへもシールドでき
る。If grounded, it can also shield against electrostatic noise, although not as well as steel.
このため、図に示すように入カケープル４と出カケープ
ル５を接続した微弱電流増幅回路１は、銅板で製作した
シールドケース２と、該シールドケース２の外側に密着
するように組み立てた鉄板のシールドケース３とから成
る二つのシールドケースでシールドする。そして、鉄板
のシールドケース３と銅板のシールドケース２は、接地
ケーブル６によって接地している。このようにすること
により、ｆｌ！磁ノイズに加え、特に静電ノイズが問題
となるところでの耐ノイズ性の強化が図られる。Therefore, as shown in the figure, a weak current amplification circuit 1 in which an input cable 4 and an output cable 5 are connected includes a shield case 2 made of a copper plate and a shield made of an iron plate assembled so as to be in close contact with the outside of the shield case 2. It is shielded by two shield cases consisting of case 3. The shield case 3 made of iron plate and the shield case 2 made of copper plate are grounded by a ground cable 6. By doing this, fl! In addition to magnetic noise, noise resistance can be strengthened especially in areas where electrostatic noise is a problem.
図において、銅板のシールドケース２が外側で。In the figure, the copper plate shield case 2 is on the outside.
鉄板のシールドケース３が内側にあっても全く同じ効果
が得られる。ただし、鉄材は鋼材に比べ堅牢であるため
、図のように鉄板を外側に設けている。Exactly the same effect can be obtained even if the iron plate shield case 3 is placed inside. However, since iron materials are more robust than steel materials, an iron plate is provided on the outside as shown in the diagram.
・２、また、鉄板のシールドケース２に銅粉を付着し１
１．これを接地すれば、上述と同様に静電ノイズ対策を
強化し、かつ、電磁ノイズに対してもシールドできる。・2. Also, attach copper powder to the iron plate shield case 2.
1. If this is grounded, electrostatic noise countermeasures can be strengthened as described above, and electromagnetic noise can also be shielded.
しかも、銅粉を鉄材に付着することにより、鋼材の加工
が不要となり安価なシールド材が提供できる。Moreover, by adhering the copper powder to the iron material, processing of the steel material becomes unnecessary and an inexpensive shielding material can be provided.
以上述べたように、本発明によれば、１０″″１４［：
Ａ］以下と極め゛て微弱な電流を増幅する微弱電流増幅
回路をシールドすれば、特に静電ノイズ対策を強化し、
かつ、電磁ノイズにも対策できるシールド材を比較的安
価に提供でき、その工業的価値は大である。As described above, according to the present invention, 10″″14[:
A] If you shield the weak current amplification circuit that amplifies extremely weak currents as shown below, you can especially strengthen electrostatic noise countermeasures.
In addition, it is possible to provide a shielding material that can take measures against electromagnetic noise at a relatively low cost, and its industrial value is great.
図は本発明の一実施例の断面図である。
１・・・微弱電流増幅回路、２・・・銅板のシールドケ
ース、３・・・鉄板のシールドケース、６・・・接地ケ
ーブル。
代理人 弁理士 小川勝男 ゛＼−
ノ′
／９１、食を弱電５Ｌ壇慴回絡
？・・・＠ｔのシールドケース
５・・・４夫不えのシールドケース
４・・・入カケーフ゛ル
５・・・社力ケーフ”ル
６・・・亨壺１１２ケーフ゛ルThe figure is a sectional view of one embodiment of the present invention. 1...Weak current amplification circuit, 2...Copper plate shield case, 3...Iron plate shield case, 6...Grounding cable. Agent: Patent Attorney Katsuo Ogawa ゛＼− ノ' /91, Is the food a weak electricity 5L platform? ...@t's shield case 5...4 endless shield case 4...input cable file 5...Sharyoku cable file 6...high pot 112 cable file
Claims (1)
ルドする手段において、該回路を、鉄シールド材と銅シ
ールド材とで二重にシールドし、これら２つのシールド
材をともに接地することを特徴とする微弱電流増幅回路
のシールド方法。1. A means for shielding a weak current amplification circuit used for radiation measurement, etc., characterized in that the circuit is doubly shielded with an iron shielding material and a copper shielding material, and these two shielding materials are both grounded. A method of shielding a weak current amplification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26968086A JPS63124600A (en) | 1986-11-14 | 1986-11-14 | Method of shielding faint current amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26968086A JPS63124600A (en) | 1986-11-14 | 1986-11-14 | Method of shielding faint current amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63124600A true JPS63124600A (en) | 1988-05-28 |
Family
ID=17475695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26968086A Pending JPS63124600A (en) | 1986-11-14 | 1986-11-14 | Method of shielding faint current amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63124600A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004309424A (en) * | 2003-04-10 | 2004-11-04 | Wire Device:Kk | Microwave level switch |
-
1986
- 1986-11-14 JP JP26968086A patent/JPS63124600A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004309424A (en) * | 2003-04-10 | 2004-11-04 | Wire Device:Kk | Microwave level switch |
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