JPH0814534B2 - Battery fluid detector - Google Patents
Battery fluid detectorInfo
- Publication number
- JPH0814534B2 JPH0814534B2 JP61019836A JP1983686A JPH0814534B2 JP H0814534 B2 JPH0814534 B2 JP H0814534B2 JP 61019836 A JP61019836 A JP 61019836A JP 1983686 A JP1983686 A JP 1983686A JP H0814534 B2 JPH0814534 B2 JP H0814534B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- battery
- wavelength
- liquid
- battery liquid
- 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
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- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【発明の詳細な説明】 技術分野 本発明は、バッテリ液の有無を検出するバッテリ液検
出装置に関する。TECHNICAL FIELD The present invention relates to a battery fluid detection device for detecting the presence or absence of battery fluid.
従来技術 従来、バッテリ液の液量不足を検知するには、バッテ
リ内の所定位置に電極センサを設置し、その電極センサ
がバッテリ液中に浸されているときにはそのバッテリ液
を介して電極間が短絡されており、バッテリ液面が一定
レベル以下に低下して電極センサが露出されるとその電
極間が開放されることにより液量不足を電気的に検知す
るようにしている。2. Description of the Related Art Conventionally, in order to detect a shortage of the amount of battery liquid, an electrode sensor is installed at a predetermined position in the battery, and when the electrode sensor is immersed in the battery liquid, the electrodes are separated via the battery liquid. When the battery level is short-circuited and the battery level drops below a certain level and the electrode sensor is exposed, the gap between the electrodes is opened to electrically detect a lack of level.
目的 本発明は、光学系を用いてバッテリ液の有無をみてバ
ッテリの液面が一定レベル以上にあるか否かを光電的に
検出する新規なバッテリ液検出装を提供するものであ
る。An object of the present invention is to provide a novel battery liquid detecting device that photoelectrically detects whether or not the liquid level of a battery is above a certain level by checking the presence or absence of the battery liquid using an optical system.
構成 以下、添付図面を参照して本発明の一実施例について
詳述する。Configuration Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.
本発明によるバッテリ液検出装置にあっては、バッテ
リの充，放電によりバッテリ液が次式にしたがって化学
変化する際、放電時のバッテリ液中に発生するOH基によ
って光吸収作用がなされる点に着目し、OH基による光吸
収波長λｏをもった光をバッテリ液中に透過させ、その
透過光の光強度のレベル検出を行なわせるようにしてい
る。In the battery liquid detecting device according to the present invention, when the battery liquid is chemically changed according to the following equation due to charging and discharging of the battery, a light absorbing action is performed by the OH group generated in the battery liquid during discharging. Focusing attention, the light having the light absorption wavelength λo by the OH group is transmitted through the battery liquid, and the level of the light intensity of the transmitted light is detected.
第１図は本発明によるバッテリ液検出装置の一実施例
を示すもので、OH基による光吸収波長λｏ含む波長帯域
をもった発光スペクトルをもつ光源１から発せられる光
Ｐを透明な容器に入れられたバッテリ液２に照射させ、
その透過光Ｐ′を目的とする波長λｏの波長選択性をも
った薄膜干渉フィルタによる光学フィルタ３を介して光
起電効果をもった受光素子４により受光させ、その受光
素子４の出力電圧を増幅器５により所定に増幅したの
ち、予めしきい値としての基準レベル電圧Vrefが設定さ
れた比較器６において受光出力電圧Vpと基準レベル電圧
Vrefとを比較するようにしている。なおここで、光源１
とバッテリ容器との間、およびバッテリ容器と受光部と
の間をそれぞれ光ファイバケーブルによって接続するよ
うにしてもよい。 FIG. 1 shows an embodiment of a battery liquid detecting device according to the present invention, in which a light P emitted from a light source 1 having an emission spectrum having a wavelength band including a light absorption wavelength λo by an OH group is put in a transparent container. Irradiate the battery fluid 2
The transmitted light P ′ is received by a light receiving element 4 having a photovoltaic effect through an optical filter 3 which is a thin film interference filter having a wavelength selectivity of the target wavelength λo, and the output voltage of the light receiving element 4 is received. After being amplified by the amplifier 5 to a predetermined level, the light-reception output voltage Vp and the reference level voltage in the comparator 6 in which the reference level voltage Vref as the threshold value is set in advance.
I try to compare with Vref. Here, the light source 1
The optical fiber cables may be used to connect between the battery container and the battery container, and between the battery container and the light receiving unit.
このように構成されたものにあって、例えば受光素子
４として一般に入手しやすい400〜1100nm程度の受光波
長帯域をもったものを使用する場合、OH基による光吸収
波長λｏをOH基により光吸収される第３次高調波の波長
（約975nm）に設定し、それに応じて光源１の発光スペ
クトルおよび光学フィルタ３における波長選択のピーク
波長を設定するようにする。この場合、光源１としては
通常の白色光源ですむようになる。When a light-receiving element 4 having a light-receiving wavelength band of 400 to 1100 nm, which is easily available, is used as the light-receiving element 4, the light-absorbing wavelength λo by the OH group is absorbed by the OH group. The wavelength of the generated third harmonic (about 975 nm) is set, and the emission spectrum of the light source 1 and the peak wavelength of wavelength selection in the optical filter 3 are set accordingly. In this case, a normal white light source can be used as the light source 1.
第２図にバッテリ液２中を透過する光の光透過特性を
示しており、OH基によって光吸収される波長λｏをもっ
た光成分の光透過率が急減することになる。FIG. 2 shows the light transmission characteristics of the light passing through the battery liquid 2, and the light transmittance of the light component having the wavelength λo that is absorbed by the OH group sharply decreases.
第３図に、光学フィルタ３の光透過特性を示してい
る。FIG. 3 shows the light transmission characteristics of the optical filter 3.
したがってこのように構成されたものでは、光源１か
ら発せられた光がバッテリ液２中を透過すれば、バッテ
リ放電時におけるバッテリ液２の溶液反応によってOH基
による光吸収波長λｏの光成分が吸収され、そのときの
受光素子４の出力電圧Vpが基準レベル電圧Vref以下に低
減して比較器６からローレベル出力が生じ、それにより
バッテリ液２が有ることが検出される。Therefore, in such a configuration, if the light emitted from the light source 1 passes through the battery liquid 2, the light component of the light absorption wavelength λo by the OH group is absorbed by the solution reaction of the battery liquid 2 during battery discharge. Then, the output voltage Vp of the light receiving element 4 at that time is reduced to the reference level voltage Vref or less and a low level output is generated from the comparator 6, whereby it is detected that the battery liquid 2 is present.
また、光源１から発せられた光がバッテリ液２中を透
過しなければ、設定波長λｏの光成分が何ら光吸収によ
って減衰されず、そのときの受光素子４の出力電圧Vpが
基準レベル電圧Vrefよりも高くなって比較器６からハイ
レベル出力が生じ、それによりバッテリ液２が無いこと
が検出される。If the light emitted from the light source 1 does not pass through the battery liquid 2, the light component of the set wavelength λo is not attenuated by any light absorption, and the output voltage Vp of the light receiving element 4 at that time is the reference level voltage Vref. Higher than the above, a high level output is generated from the comparator 6, whereby it is detected that the battery fluid 2 is absent.
したがって、バッテリ液２おける所定の高さ位置に指
向性をもって光源１から発せられる光を透過させるよう
にすれば、バッテリ液２の液面が所定のレベル以上にあ
るか否かの検出を行なわせることができるようになる。Therefore, if the light emitted from the light source 1 is transmitted with directivity to a predetermined height position in the battery liquid 2, it is possible to detect whether or not the liquid surface of the battery liquid 2 is above a predetermined level. Will be able to.
バッテリ放電時の溶液反応による光吸収作用はSO4基
によっても行なわれ、設定波長λｏとしてSO4基により
光吸収される波長（第１次高調波で約９μｍ）を用い
て、それに応じて光源１の発光スペクトル，光学フィル
タ３の中心波長および受光素子４の受光波長帯域をそれ
ぞれ決定するようにしてもよい。Light absorption by a solution reaction during battery discharge is performed by SO 4 group, with a wavelength (about 9μm in first-order harmonic) is light absorbed by the SO 4 group as set wavelength .lamda.o, the light source accordingly The emission spectrum of 1, the central wavelength of the optical filter 3, and the light receiving wavelength band of the light receiving element 4 may be determined.
また、本発明によれば、バッテリ液２の有無を検出す
るのみならず、バッテリ液２が有ることを前提として、
バッテリ液２中に不純物が混入されているか否かを検出
することができるようになる。Further, according to the present invention, not only is the presence or absence of the battery liquid 2 detected, but it is assumed that the battery liquid 2 is present.
It becomes possible to detect whether or not impurities are mixed in the battery liquid 2.
すなわち、バッテリ液２中に不純物となる液体が混入
されていると、OH基またはSO4基による光吸収波長が変
化し、それによりバッテリ液２中において設定波長λｏ
の光成分の光吸収が充分に行なわれなくなって受光素子
４により受光される光強度が比較的高くなり、それによ
り受光素子４の出力電圧Vpが基準レベル電圧Vrefよりも
高くなって比較器６からハイレベル出力が生ずることに
なる。That is, when a liquid as an impurity is mixed in the battery liquid 2, the light absorption wavelength by the OH group or the SO 4 group changes, which causes the set wavelength λo in the battery liquid 2 to change.
Is not sufficiently absorbed and the light intensity received by the light receiving element 4 becomes relatively high, which causes the output voltage Vp of the light receiving element 4 to become higher than the reference level voltage Vref and the comparator 6 To produce a high level output.
なお、受光素子４としてそれぞれ以下に説明するよう
な波長選択性をもった特殊なものを使用すれば、光学フ
ィルタ３を用いる必要がなくなる。It should be noted that if the light receiving element 4 is a special one having wavelength selectivity as described below, it is not necessary to use the optical filter 3.
すなわち、その特殊な受光素子としては、第４図に示
すように、ｎ形半導体部分にｐ形不純物が拡散された光
起電層101上に、所定の光透過特性をもった半導体層102
を積層させることによって構成されている。That is, as the special light receiving element, as shown in FIG. 4, a semiconductor layer 102 having a predetermined light transmission characteristic is formed on a photovoltaic layer 101 in which p-type impurities are diffused in an n-type semiconductor portion.
It is constituted by stacking.
光起電層101は、例えば、GaAsのｎ形基板上に、禁止
帯幅Eg1を決定することにより、第５図に示すように感
度領域の波長限界となる波長λ１を所定に設定するべ
く、GaとInとＰとの各比率を管理した比較的禁止帯幅の
広いｎ形のInGaAsPなどの液晶を液相成長させたうえ
で、ｐ形不純物を拡散させることによりＰ−Ｎ接合を形
成している。第５図は、光起電層101の波長に対する光
電流Ｉの感度特性を示している。The photovoltaic layer 101, for example, on an n-type substrate of GaAs, determines the bandgap Eg1 to set a predetermined wavelength λ1 that is the wavelength limit of the sensitivity region as shown in FIG. A liquid crystal such as n-type InGaAsP having a relatively wide bandgap in which the ratio of Ga, In, and P is controlled is liquid-phase-grown, and then p-type impurities are diffused to form a P-N junction. ing. FIG. 5 shows the sensitivity characteristic of the photocurrent I with respect to the wavelength of the photovoltaic layer 101.
半導体層102は、GaとInとＰとの各比率を管理するこ
とにより禁止帯幅Eg2を光起電層101の禁止帯幅Eg1より
も広くしたInGaAsPを液相成長させることにより積層形
成され、第６図の波長に対する光透過率の特性で示すよ
うに、光起電層101の感度特性におけるピーク波長λｐ
よりも短波長側に設定された波長λ２より長波長側に光
透過帯域を有する光透過特性をもたせるようにしてい
る。The semiconductor layer 102 is formed by liquid crystal growth of InGaAsP in which the forbidden band width Eg2 is made wider than the forbidden band width Eg1 of the photovoltaic layer 101 by controlling the respective ratios of Ga, In and P, and As shown by the characteristic of the light transmittance with respect to the wavelength in FIG. 6, the peak wavelength λp in the sensitivity characteristic of the photovoltaic layer 101.
The light transmission characteristic having a light transmission band on the longer wavelength side than the wavelength λ2 set on the shorter wavelength side is provided.
したがって第４図に示すように構成された受光素子に
あっては、結果的に第７図に示すような場合感度特性を
有することになり、それに光Ｐが照射されると半導体層
102によって設定波長λ２よりも長波長側の波長をもっ
た光のみがろ波され、そのろ波された光が光起電層101
に入ってそこで設定波長λ１よりも短波長側の波長をも
った光のみがセンシングされ、一定の波長帯域（λ２〜
λ１）にある光のみが選択的に検知されることになる。Therefore, the light-receiving element configured as shown in FIG. 4 has sensitivity characteristics as shown in FIG. 7 as a result, and when the light P is applied to the semiconductor layer,
Only light having a wavelength longer than the set wavelength λ2 is filtered by 102, and the filtered light is collected by the photovoltaic layer 101.
Then, only light having a wavelength on the shorter wavelength side than the set wavelength λ1 is sensed, and a certain wavelength band (λ2 to λ2
Only the light in λ1) will be selectively detected.
しかして、光起電層101の感度特性におけるピーク感
度波長λｐをOH基またはSO4基による光吸収波長λｏに
設定するようにすれば、バッテリ液２中を透過した光の
うちのλｏ成分を選択的に検知することができるように
なる。Then, if the peak sensitivity wavelength λp in the sensitivity characteristics of the photovoltaic layer 101 is set to the light absorption wavelength λo by the OH group or the SO 4 group, the λo component of the light transmitted through the battery liquid 2 is detected. It becomes possible to detect selectively.
また、第５図に示すような感度特性をもった普通の受
光素子と第６図に示すような光感度特性をもった光学フ
ィルタとを組み合せるようにしても、第７図に示すよう
な総合感度特性を得ることができる。Further, even if an ordinary light receiving element having a sensitivity characteristic as shown in FIG. 5 and an optical filter having a light sensitivity characteristic as shown in FIG. 6 are combined, as shown in FIG. Overall sensitivity characteristics can be obtained.
効果 以上、本発明によるバッテリ液検出装置にあっては、
バッテリの放電によってバッテリ液が化学変化する際に
バッテリ液中に生ずるOH基またはSO4基により光吸収さ
れる特定帯域の波長をもった光を、光透過性を有するバ
ッテリ容器の所定高さの位置から指向性をもってバッテ
リ液面と平行になるように照射する手段と、そのバッテ
リ容器を通過した特定帯域の波長の光を受光する手段
と、その受光量が予め設定されたしきい値以下であるか
否かによって、バッテリ液の液面が所定のレベル以上に
あるか否かを検出する手段とをとるようにしたもので、
光学的にバッテリ液の有無をみてその液面が一定レベル
以上にあるか否かの検出、およびバッテリ液に不純物が
混入されているか否かの検出を確実に行わせることがで
きるという優れた利点を有している。Effects As described above, in the battery fluid detection device according to the present invention,
Light having a wavelength in a specific band, which is absorbed by the OH group or SO 4 group generated in the battery liquid when the battery liquid is chemically changed due to the discharge of the battery, is emitted at a predetermined height of the battery container having optical transparency. A means for irradiating from a position with directivity parallel to the liquid surface of the battery, a means for receiving light of a wavelength in a specific band that has passed through the battery container, and the amount of light received is below a preset threshold value. And a means for detecting whether or not the liquid level of the battery liquid is above a predetermined level depending on whether or not there is,
An excellent advantage that the presence or absence of the battery liquid can be optically detected to detect whether the liquid level is above a certain level or not and whether the battery liquid contains impurities or not. have.
第１図は本発明によるバッテリ液検出装置の一実施例を
示す簡略構成図、第２図はバッテリ液中を透過する光の
光透過特性を示す図、第３図は同実施例における光フィ
ルタの光透過特性を示す図、第４図は波長選択性をもっ
た特殊な受光素子の構造を示す図、第５図はその特殊な
受光素子における光起電層の感度特性を示す図、第６図
は同じくその半導体層の光透過特性を示す図、第７図は
その特殊な受光素子の総合的な感度特性を示す図であ
る。 １……光源、２……バッテリ液、３……光学フィルタ、
４……受光素子、５……増幅器、６……比較器、101…
…光起電層、102……半導体層FIG. 1 is a simplified configuration diagram showing an embodiment of a battery liquid detecting device according to the present invention, FIG. 2 is a diagram showing a light transmission characteristic of light transmitted through the battery liquid, and FIG. 3 is an optical filter in the same embodiment. FIG. 4 is a diagram showing the structure of a special light receiving element having wavelength selectivity, and FIG. 5 is a diagram showing the sensitivity characteristics of the photovoltaic layer in the special light receiving element. FIG. 6 is a diagram showing the light transmission characteristic of the semiconductor layer, and FIG. 7 is a diagram showing the overall sensitivity characteristic of the special light receiving element. 1 ... Light source, 2 ... Battery fluid, 3 ... Optical filter,
4 ... Light receiving element, 5 ... Amplifier, 6 ... Comparator, 101 ...
... Photovoltaic layer, 102 ... Semiconductor layer
Claims (1)
変化する際にバッテリ液中に生ずるOH基またはSO4基に
より光吸収される特定帯域の波長をもった光を、光透過
性を有するバッテリ容器の所定高さの位置から指向性を
もってバッテリ液面と平行になるように照射する手段
と、そのバッテリ容器を通過した特定帯域の波長の光を
受光する手段と、その受光量が予め設定されたしきい値
以下であるか否かによって、バッテリ液の液面が所定の
レベル以上にあるか否かを検出する手段とによって構成
されたバッテリ液検出装置。1. A battery container having light transmissivity for light having a wavelength in a specific band, which is absorbed by OH groups or SO 4 groups generated in the battery liquid when the battery liquid is chemically changed by discharging the battery. Means for irradiating from a position of a predetermined height so as to be parallel to the battery liquid surface with directivity, means for receiving light of a wavelength in a specific band that has passed through the battery container, and the amount of received light are preset. A battery fluid detection device comprising: means for detecting whether or not the liquid level of the battery fluid is above a predetermined level, depending on whether or not it is below a threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61019836A JPH0814534B2 (en) | 1986-01-31 | 1986-01-31 | Battery fluid detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61019836A JPH0814534B2 (en) | 1986-01-31 | 1986-01-31 | Battery fluid detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62177434A JPS62177434A (en) | 1987-08-04 |
| JPH0814534B2 true JPH0814534B2 (en) | 1996-02-14 |
Family
ID=12010358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61019836A Expired - Lifetime JPH0814534B2 (en) | 1986-01-31 | 1986-01-31 | Battery fluid detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0814534B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3484966B2 (en) * | 1998-02-20 | 2004-01-06 | 株式会社日立製作所 | Motor drive device equipped with deterioration diagnosis device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5148379A (en) * | 1974-10-23 | 1976-04-26 | Koparukooon Kk | HISHOKUSHIKINO DOKEI |
| JPS57106844A (en) * | 1980-12-24 | 1982-07-02 | Toyota Motor Corp | Moisture detecting method in liquid fuel |
| JPS5952733A (en) * | 1982-09-20 | 1984-03-27 | Masamitsu Sato | Manufacture of optional concentration liquid by light emitting diode and photodiode (semiconductor element) |
-
1986
- 1986-01-31 JP JP61019836A patent/JPH0814534B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62177434A (en) | 1987-08-04 |
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