JPH0285744A - Raining/snowing discriminating sensor - Google Patents
Raining/snowing discriminating sensorInfo
- Publication number
- JPH0285744A JPH0285744A JP63237308A JP23730888A JPH0285744A JP H0285744 A JPH0285744 A JP H0285744A JP 63237308 A JP63237308 A JP 63237308A JP 23730888 A JP23730888 A JP 23730888A JP H0285744 A JPH0285744 A JP H0285744A
- Authority
- JP
- Japan
- Prior art keywords
- polarized light
- light
- snow
- rain
- intensity
- 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.)
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Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
Description
本発明は、偏光を用いて降雨と降雪を判別するセンサに
関するものである。The present invention relates to a sensor that uses polarized light to distinguish between rain and snow.
降雨、降雪を最も正確かつ迅速に判断できるのは観天望
気であるが、無人の地点での観測ができないことやＩＩ
Ｊ、続的な観測が困難であることから。
各種の機器による観測が開発されている。例えば高速道
路などに雨雪を観測する機器を設置し、その現場での気
象情報をリアルタイムに管理場所へ流すようにしておく
、その情報を通行中の車両へ標識などで知らせることが
可能となる。
雨雪を観測する機器として雨量計や路上の積雪を超音波
や電磁波で直接測定し情報を得て雨雪を判断する機器か
ある。これらのＩｌ器は、降り始めてから一定時間経過
しないと、雨や雪が降っているかを判断できない、その
ため気象情報の提供や・、その地域の道路などに必要な
安全管理上の対策に迅速性が欠ける場合があった。雪を
降り始めに観測できれば、積雪前に事前通報が可能にな
るので安全性は格９段に向上する。
雪を降り始めに観測できる機器として光学式センサを用
いた機器がある。光学式センサの機器には、パルス光源
からの光軸路を雪が遮断するのを検知する透過型センサ
や、パルス光源を空中に照射して雪に反射させその反射
信号強度によって検知する反射型センサの機器がある。
［発明が解決しようとする課題］
上記した従来の光学式センサを用いた雨雪を観測する機
器には、以下のような欠点があった。透過型センサの機
器は、光軸路と平行な風が強い状況では降雪を検知でき
ない、また反射型センサの機器は、降雨を検知できない
ため別途に降雨だけを観測できる機器を併設する必要が
あった。
本発明は、これらの欠点を解消するためになされたもの
で、１台の機器で降雨降雪の有無、雨か雷かの判定、降
雨から降雪への変化、その逆であるか、降雨強度（ｍｌ
）や降雪強度（量）はどうかを検知することができる降
雨降雪判別センサを提供するものである。The most accurate and quick way to determine rainfall and snowfall is by observing the sky, but it is difficult to observe at unmanned locations and
J. Because continuous observation is difficult. Observations using various instruments have been developed. For example, it would be possible to install equipment to observe rain and snow on expressways, etc., and to send the weather information at the site to a management location in real time, and to notify passing vehicles of this information by means of signs, etc. . Equipment for observing rain and snow includes rain gauges and devices that directly measure the snow on the road using ultrasonic waves or electromagnetic waves to obtain information and determine whether it is rain or snow. These instruments cannot determine whether it is raining or snowing until a certain period of time has elapsed since it started raining, which makes it difficult to quickly provide weather information and take necessary safety management measures for roads in the area. There were times when it was missing. If we can observe snow when it starts to fall, we will be able to give warnings in advance before it snows, which will significantly improve safety by nine points. There is a device that uses an optical sensor that can observe snow when it starts to fall. Optical sensor equipment includes a transmission type sensor that detects when snow blocks the optical axis path from a pulsed light source, and a reflective type sensor that irradiates a pulsed light source into the air, reflects it off the snow, and detects the intensity of the reflected signal. There is equipment. [Problems to be Solved by the Invention] The above-described conventional equipment for observing rain and snow using optical sensors has the following drawbacks. Transmissive sensor equipment cannot detect snowfall in strong winds parallel to the optical axis path, and reflective sensor equipment cannot detect rainfall, so it is necessary to install a separate device that can only monitor rainfall. Ta. The present invention was made to eliminate these drawbacks, and uses a single device to determine whether there is rain or snow, whether it is rain or thunder, whether there is a change from rain to snow or vice versa, and whether the rainfall intensity ( ml
) and the intensity (amount) of snowfall.
上記課題を解決するための本発明を適用する降雨降雪判
別センサを、実施例に対応する第１図により説明する。
同図に示すように、本発明の降雨降雪判別センサは、光
学要素として空中にむけて偏光７を投光する光学系３・
４・６・８、偏光７が空中の雨または雪９で反射した反
射光１１を受光し一〇垂直偏光１３と水平偏光１４とに
分離する光学系１０・１２および１５と１６を何してい
る。電気回路要素として垂直偏光１３と水平偏光１４の
夫々を光電変換する光電変換器１７・１９と１８・２０
、および取直偏光１３の光電変換出力ｅと水平偏光１４
の光電変換出力ｆとを比較する比較器２４・２５を有し
ている。A rain/snowfall discrimination sensor to which the present invention is applied to solve the above problems will be explained with reference to FIG. 1 corresponding to an embodiment. As shown in the figure, the rain/snowfall discrimination sensor of the present invention includes an optical system 3 that projects polarized light 7 into the air as an optical element.
4.6.8, What are the optical systems 10, 12, 15, and 16 that receive the reflected light 11 from the polarized light 7 reflected by rain or snow 9 in the air and separate it into vertically polarized light 13 and horizontally polarized light 14? There is. Photoelectric converters 17, 19 and 18, 20 that photoelectrically convert vertically polarized light 13 and horizontally polarized light 14, respectively, as electric circuit elements.
, and the photoelectric conversion output e of the polarized light 13 and the horizontal polarized light 14
It has comparators 24 and 25 for comparing the photoelectric conversion output f with the photoelectric conversion output f.
この降雨降雪判別センサで光学系３・４・６・８から偏
光７が空中にむけて投光され、雨が降っている場合、偏
光が殆ど揃ったま＼反射される。
雪が降っている場合、雪により散乱して反射光は、偏光
が乱れて自然光と同じ状態になる。前者の場合、垂直偏
光１３の強度が水平偏光１４より強く、光電変換器１７
・１９と光電変換出力ｅは、光電変換器１８・２０の光
電変換出力ｆより大きい。したがって出力ｅとｆとを比
較器２４・２５で比較するとｅｌｆとなり、降雨である
ことが解る。後書の場合、反射光は自然光と同じである
から垂直偏光１３の強度と水平偏光１４は等しい、した
がって光電変換器１７・１９の光電変換出力ｅと光電変
換器１８・２０の光電変換出力ｆを比較器２４・２５で
比較すると略等しく、降雪であることが解る。In this rain/snowfall discrimination sensor, polarized light 7 is projected into the air from optical systems 3, 4, 6, and 8, and when it is raining, the polarized light is reflected with almost uniform polarization. When it is snowing, the polarization of the reflected light scattered by the snow is disrupted and becomes the same as natural light. In the former case, the intensity of the vertically polarized light 13 is stronger than the horizontally polarized light 14, and the photoelectric converter 17
- 19 and the photoelectric conversion output e are larger than the photoelectric conversion output f of the photoelectric converters 18 and 20. Therefore, when the outputs e and f are compared by the comparators 24 and 25, elf is obtained, which indicates that it is raining. In the case of the afterword, since the reflected light is the same as natural light, the intensity of the vertically polarized light 13 and the horizontally polarized light 14 are equal, so the photoelectric conversion output e of the photoelectric converters 17 and 19 and the photoelectric conversion output f of the photoelectric converters 18 and 20 When compared by the comparators 24 and 25, they are almost equal, indicating that it is snowfall.
第１図は本発明を適用する降雨降雪判別センサの実施例
のブロック図である。
同図の１はパルス発振器、２は発光ダイオードｆ１．Ｅ
Ｄｌ ドライバ、３は発光ダイオード（ＬＥＤ） 、
４は焦光レンズ、５は平行光線、６は垂直偏光ビーム
スプリッタ、７は平行垂直偏光、８は投光レンズ、９は
雨または雪、ＩＯは受光レンズ、１１は受光光線、１２
は偏光ビームスプリッタ、１３は垂直偏光成分、１４は
水平偏光成分、１５は垂直偏光成分のコンデンサレンズ
、１６は水平偏光成分のコンデンサレンズ、１７は垂直
偏光フォトダイオード、１８は水平偏光フォトダイオー
ド。
１９は垂直偏光受信器、２０は水平偏光受信器、２４．
２５．２６８よび２７は比較器、２８は温度センサ、２
９は増幅比較器、３０は雨相聞器、３１は雪相関器、３
２は積分器である。
上記の回路ブロックで発振器ｌからパルス信号を発光ダ
イオードドライバ２に送り、発光ダイオード３を動作さ
せる０発光ダイオード３からの光を焦光レンズ４によっ
て平行光線５にする。この平行光線５は自然光であるか
らあらゆる偏光成分を含み、垂直偏光ビームスブリック
６によって垂直偏光成分のみ直進させ他の偏光成分は光
路外に反射してしまう、直進した垂直偏光７は、投光レ
ンズ８によって約ｌＯ°程度の開角に広げられ空間に投
光される。投光された垂直偏光は、空間の雨または雪９
によって反射または屈折する。巾の場合、垂直偏光の一
部が雨滴の滑らかな表面でそのまま反射し、一部が雨滴
の内部へ屈折してから雨滴の外部へ屈折して出るか反射
して出る６反射した光は、偏光が殆ど揃ったま＼受光レ
ンズｌＯへ向かう、しかし雪の場合は表面の無限に近い
凹凸によって乱臣ｑオシたり、一部が結晶内で屈折反射
を繰り返す、そのために垂直偏光は散乱して、受光レン
ズｌＯへ向かって反射して（る光は、偏光が乱れている
。
雨または雪９によって反射してきた光を受光レンズｌＯ
で集め、平行光１１にして分離用偏光ビームスプリッタ
１２に送る。分離用偏光ビームスプリッタ１２では垂直
偏光成分１３と水平偏光成分１４に分離する。垂直偏光
成分１３はコンデンサレンズ１５によって焦光され）オ
ドダイオード１７で電気信号に変換され垂直偏光受信器
１９で受光レベルに対応した雨反射信号ｅが出力される
。水平偏光成分１４はコンデンサレンズ１６によって焦
光されフォトダイオード１８で電気信号に変換され垂直
偏光受信器２０で受光レベルに対応した雪反射信号ｆが
出力される。なお垂直偏光受信器１９および水平偏光受
信器２０は、パルス発振器ｌから発光ダイオード３を動
作させる動作させる時間や周波数だけ受信するようにパ
ルス発振器１から同期信号ｄによって動作し、いわゆる
同期検波がなされる。
降雨のあるときは、垂直偏光受信器１９からの出力信号
ｅが水平偏光受信器２０の出力信号ｆよりも大きい、こ
の差を比較器２４が判定して雨であることの出力を出す
、降雪のときには垂直偏光受信器１９の出力と水平偏光
受信器２０の出力に差がな（なる。このことを比較器２
５が夫々の入力から判定して雪であることの出力を出す
。
一方、温度センサ２８によって気温を観測し、増幅比較
器２９によって雨が降る気温（４℃程度以上）と雪が降
る気温（４℃程度以下）を内部で比較する。雨が降る気
温の出力は比較器２６に送られ、雪が降る気温の出力は
比較器２７に送られる。比較器２４から出力されている
雨信号は比較器２６でさらに確認され完全な雨信号ａと
して出力される。比較器２５から出力された雪信号は比
較器２７でさらに確認され完全な雪信号すとして出力さ
れる。
第２図には、雨が降り始め雪に変わり、−旦止んでから
再び雪が降り、雨に変わった気象変化の（ａ）雨信号お
よび（ｂ）雪信号につき信号変化のタイムチャートを示
しである。
雨相関器３０および雪相関器３１は、第３図に示すよう
な夫々用相関曲線および雪相面曲線が設定されている。
これらの相関曲線は、夫々用反射信号の強度と降雨強度
、雪反射信号の強度と降雪強度の関係を実測試験から求
めた結果である。したがって垂直偏光受信器１９からの
雨反射信号ｅは雨相関器３０を通って降雨強度に変換さ
れ、水平偏光受信器２０からの雪反射信号ｆの出力は雪
相関器３１を通って降雪強度に変換される。これらの降
雨強度および降雪強度の信号は積分器３２に入力し、一
定時間（数秒〜数分）積分されて降雨降雪強度の出力信
号Ｃとして出力される。
上記の実施例による降雨降雪判別センサは、降雨降雪に
ついての諸情報を検知できることは勿論１発光ダイオー
ド３による投光をドライバ２によりパルス発光させてい
るため発光強度が増大してフォトダイオード１７および
１８の受光感度が向上し、僅かな降雨降雪でも的確に検
知できる。
また投光光である平行垂直偏光７を投光レンズ８によっ
て約ｌＯ°程度の開角に広げているため、空間の捕捉率
が向上し、局部的に降雨降雪があったときでも的確に検
知できる。尚、この開角はあまり広げすぎると雨滴から
の反射光の受光に際し、偏光が乱れる傾向になるため、
適度な角度に留める必要がある。
なお受信器や比較器の性能を向上すればみぞれ、霧など
の判定も出来、雨量計としても使用できる。FIG. 1 is a block diagram of an embodiment of a rainfall/snowfall discrimination sensor to which the present invention is applied. In the figure, 1 is a pulse oscillator, 2 is a light emitting diode f1. E
Dl driver, 3 is a light emitting diode (LED),
4 is a focusing lens, 5 is a parallel light beam, 6 is a vertically polarized beam splitter, 7 is a parallel vertically polarized light, 8 is a projecting lens, 9 is rain or snow, IO is a light receiving lens, 11 is a receiving light beam, 12
13 is a vertical polarization component, 14 is a horizontal polarization component, 15 is a condenser lens for the vertical polarization component, 16 is a condenser lens for the horizontal polarization component, 17 is a vertical polarization photodiode, and 18 is a horizontal polarization photodiode. 19 is a vertical polarization receiver, 20 is a horizontal polarization receiver, 24.
25.268 and 27 are comparators, 28 is a temperature sensor, 2
9 is an amplification comparator, 30 is a rain correlator, 31 is a snow correlator, 3
2 is an integrator. In the circuit block described above, a pulse signal is sent from the oscillator l to the light emitting diode driver 2 to operate the light emitting diode 3.0 The light from the light emitting diode 3 is converted into a parallel beam 5 by the focusing lens 4. Since this parallel light ray 5 is natural light, it contains all kinds of polarized light components, and only the vertically polarized light component travels straight through the vertical polarization beam block 6, while the other polarized light components are reflected out of the optical path. 8, the light is expanded to an opening angle of about 10° and projected into space. The vertically polarized light projected is rain or snow in space9
reflected or refracted by In the case of width, part of the vertically polarized light is directly reflected from the smooth surface of the raindrop, and part of it is refracted into the inside of the raindrop and then refracted or reflected to the outside of the raindrop.6The reflected light is Most of the polarized light heads towards the light receiving lens 1O, but in the case of snow, the nearly infinite unevenness of the surface causes it to be distorted, and some of it is repeatedly refracted and reflected within the crystal, so the vertically polarized light is scattered and received. The light reflected towards the lens lO has disordered polarization.
, the beam is collected into parallel light 11 and sent to a polarizing beam splitter 12 for separation. The polarizing beam splitter 12 separates the light into a vertically polarized component 13 and a horizontally polarized component 14 . The vertically polarized light component 13 is focused by a condenser lens 15) and converted into an electrical signal by an odd diode 17, and a vertically polarized light receiver 19 outputs a rain reflection signal e corresponding to the received light level. The horizontally polarized light component 14 is focused by a condenser lens 16, converted into an electrical signal by a photodiode 18, and a snow reflection signal f corresponding to the received light level is outputted by a vertically polarized light receiver 20. The vertical polarization receiver 19 and the horizontal polarization receiver 20 are operated by a synchronization signal d from the pulse oscillator 1 so as to receive from the pulse oscillator 1 only the time and frequency at which the light emitting diode 3 is operated, and so-called synchronous detection is performed. Ru. When it is raining, the output signal e from the vertical polarization receiver 19 is larger than the output signal f from the horizontal polarization receiver 20. The comparator 24 determines this difference and outputs an output indicating that it is raining. When , there is no difference between the output of the vertical polarization receiver 19 and the output of the horizontal polarization receiver 20.
5 determines from each input and outputs an output indicating that it is snow. On the other hand, the temperature sensor 28 observes the temperature, and the amplification comparator 29 internally compares the temperature at which it rains (approximately 4° C. or higher) and the temperature at which it snows (approximately 4° C. or lower). The output of the temperature at which it rains is sent to the comparator 26, and the output at which the temperature at which it snows falls is sent to the comparator 27. The rain signal output from the comparator 24 is further checked by the comparator 26 and output as a complete rain signal a. The snow signal output from the comparator 25 is further checked by a comparator 27 and output as a complete snow signal. Figure 2 shows a time chart of signal changes for (a) a rain signal and (b) a snow signal for a meteorological change in which rain begins to fall, changes to snow, then stops, then snow again, and then changes to rain. be. The rain correlator 30 and the snow correlator 31 have respective correlation curves and snow phase surface curves as shown in FIG. These correlation curves are the results of actual measurements of the relationship between the intensity of the reflected signal and the intensity of rainfall, and the intensity of the snow reflected signal and the intensity of snowfall, respectively. Therefore, the rain reflection signal e from the vertical polarization receiver 19 passes through the rain correlator 30 and is converted into rainfall intensity, and the output of the snow reflection signal f from the horizontal polarization receiver 20 passes through the snow correlator 31 and is converted into snowfall intensity. converted. These rainfall intensity and snowfall intensity signals are input to an integrator 32, where they are integrated over a certain period of time (several seconds to several minutes) and output as an output signal C of rainfall and snowfall intensity. The rain/snow detection sensor according to the embodiment described above is capable of detecting various information about rain/snow, of course, and since the light emitted by the light emitting diode 3 is emitted in pulses by the driver 2, the light emission intensity increases and the photodiodes 17 and 18 The light-receiving sensitivity of the sensor has been improved, making it possible to accurately detect even the slightest amount of rain or snow. In addition, the parallel and vertically polarized light 7, which is the projected light, is spread to an opening angle of about 10° by the projecting lens 8, which improves the spatial capture rate and enables accurate detection even when there is local rain or snow. can. Note that if this opening angle is too wide, the polarization will tend to be disrupted when the reflected light from the raindrops is received.
It needs to be kept at a proper angle. If the performance of the receiver and comparator is improved, it will be possible to detect sleet, fog, etc., and it can also be used as a rain gauge.
以上説明したように１本発明を適用した降雨降雪判別セ
ンサは、無人地帯でも継続的に気象状態を観測できる。
１台の機器により降雨降雪の有無のみならず、雨か雪か
の判定、降雨から降雪への変化、降雨強度、降雪強度、
降雨量、積雪量を的確かつ迅速に検知することが可能と
なる。そのため気象情報の提供や、その地域の道路など
に必要な安全管理上の対策に迅速に対応できるようにな
る。特に雪が降り始めに強度も観測でき、積雪前に事前
通報が可能になるので安全性は格段に向上する。As explained above, the rain/snowfall discrimination sensor to which the present invention is applied can continuously observe weather conditions even in uninhabited areas. A single device not only determines whether there is rain or snow, but also determines whether it is rain or snow, changes from rain to snow, rainfall intensity, snowfall intensity,
It becomes possible to accurately and quickly detect the amount of rainfall and snowfall. This makes it possible to quickly provide weather information and take necessary safety management measures for roads in the area. In particular, the intensity of snow can be observed when it starts to fall, making advance notification possible before the snow accumulates, greatly improving safety.
第１図は本発明を適用する降雨降雪判別センサの実施例
のブロック図、第２図は両信号および雪信号の変化を示
すタイムチャート図、第３図は反射信号の強度と降雨、
降雪強度の相関関係図である。
ｌ・・・パルス発振器
２・・・発光ダイオードドライバ
３・・・発光ダイオード ４・・・焦光レンズ５・・
・平行光線
６・・・垂直偏光ビームスプリッタ
７・・・平行垂直偏光 ８・・・投光レンズ９・・
・雨または雪 １０・・・受光レンズ１１・・・受
光光線
１２・・・偏光ビームスプリッタ
１３・・・垂直偏光成分 １４・・・水平偏光成分＋
５・・・垂直偏光成分のコンデンサレンズ１６−・・水
平偏光成分のコンデンサレンズ１７・・・垂直偏光フォ
トダイオード
１８・・・水平偏光フォトダイオード
１つ・・・垂直偏光受信器 ２０・・・水平偏光受信器
、２４・２５・２６・２７・・・比較器
２８・・・温度センサ ２９・・・増幅比較器３０
・・・由相関器 ３１・・・雪相関器３２−・・
積分器
ａ・・・両信号 ｂ・・・雪信号Ｃ・・・降雨
雪強度の出力信号
ｄ・・・同期信号 ｅ・・・雨反射信号ｆ・・・
雪反射信号FIG. 1 is a block diagram of an embodiment of a rain/snow detection sensor to which the present invention is applied, FIG. 2 is a time chart showing changes in both signals and the snow signal, and FIG. 3 is a diagram showing the intensity of the reflected signal and rainfall,
It is a correlation diagram of snowfall intensity. l... Pulse oscillator 2... Light emitting diode driver 3... Light emitting diode 4... Focusing lens 5...
・Parallel light beam 6...Vertical polarization beam splitter 7...Parallel vertical polarization 8...Light projection lens 9...
・Rain or snow 10...Receiving lens 11...Receiving light beam 12...Polarizing beam splitter 13...Vertical polarization component 14...Horizontal polarization component +
5... Condenser lens for vertically polarized light component 16 -... Condenser lens for horizontally polarized light component 17... Vertical polarized photodiode 18... One horizontally polarized photodiode... Vertical polarized light receiver 20... Horizontal Polarization receiver, 24, 25, 26, 27... Comparator 28... Temperature sensor 29... Amplification comparator 30
...Year correlator 31...Snow correlator 32-...
Integrator a...Both signals b...Snow signal C...Output signal of rainfall and snow intensity d...Synchronization signal e...Rain reflection signal f...
snow reflection signal
Claims (1)
空中の雨または雪で反射した反射光を受光して垂直偏光
と水平偏光とに分離する光学系、該垂直偏光と該水平偏
光の夫々を光電変換する光電変換器および該垂直偏光の
光電変換出力と該水平偏光の光電変換出力とを比較する
比較器を有し、該垂直偏光と該水平偏光の強度を比較す
ることにより雨または雪の判別をすることを特徴とする
降雨降雪判別センサ。1. An optical system that projects polarized light into the air, an optical system that receives reflected light from rain or snow in the air, and separates it into vertically polarized light and horizontally polarized light, and the vertically polarized light and the horizontally polarized light. and a comparator that compares the photoelectric conversion output of the vertically polarized light and the photoelectric conversion output of the horizontally polarized light. Or a rainfall/snowfall discrimination sensor characterized by discriminating snow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63237308A JPH0774780B2 (en) | 1988-09-21 | 1988-09-21 | Rainfall snowfall discrimination sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63237308A JPH0774780B2 (en) | 1988-09-21 | 1988-09-21 | Rainfall snowfall discrimination sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0285744A true JPH0285744A (en) | 1990-03-27 |
| JPH0774780B2 JPH0774780B2 (en) | 1995-08-09 |
Family
ID=17013444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63237308A Expired - Lifetime JPH0774780B2 (en) | 1988-09-21 | 1988-09-21 | Rainfall snowfall discrimination sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0774780B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0630734U (en) * | 1992-09-28 | 1994-04-22 | 日本無線株式会社 | Optical sensor |
| JP2007278858A (en) * | 2006-04-07 | 2007-10-25 | Shinei Kk | Fog particle sensor and fog sensor |
| JP2009128236A (en) * | 2007-11-26 | 2009-06-11 | Denso Corp | Fog detection device and installation method thereof |
| JP2010112952A (en) * | 2008-11-05 | 2010-05-20 | Rosemount Aerospace Inc | Apparatus and method for in-flight detection of airborne water droplets and ice crystals |
| WO2023096060A1 (en) * | 2021-11-26 | 2023-06-01 | 주식회사 마하테크 | Sea surface oil detection device |
| KR102672058B1 (en) * | 2022-12-02 | 2024-06-04 | 주식회사 마하테크 | Oil detection device on the sea |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61172032A (en) * | 1985-01-25 | 1986-08-02 | Meisei Electric Co Ltd | Optical raindrop and snow flake discrimination apparatus |
| JPS61175550A (en) * | 1985-01-31 | 1986-08-07 | Meisei Electric Co Ltd | Optical measuring method and apparatus for intensity of rain and snow falling |
-
1988
- 1988-09-21 JP JP63237308A patent/JPH0774780B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61172032A (en) * | 1985-01-25 | 1986-08-02 | Meisei Electric Co Ltd | Optical raindrop and snow flake discrimination apparatus |
| JPS61175550A (en) * | 1985-01-31 | 1986-08-07 | Meisei Electric Co Ltd | Optical measuring method and apparatus for intensity of rain and snow falling |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0630734U (en) * | 1992-09-28 | 1994-04-22 | 日本無線株式会社 | Optical sensor |
| JP2007278858A (en) * | 2006-04-07 | 2007-10-25 | Shinei Kk | Fog particle sensor and fog sensor |
| JP2009128236A (en) * | 2007-11-26 | 2009-06-11 | Denso Corp | Fog detection device and installation method thereof |
| JP2010112952A (en) * | 2008-11-05 | 2010-05-20 | Rosemount Aerospace Inc | Apparatus and method for in-flight detection of airborne water droplets and ice crystals |
| WO2023096060A1 (en) * | 2021-11-26 | 2023-06-01 | 주식회사 마하테크 | Sea surface oil detection device |
| KR102691240B1 (en) * | 2021-11-26 | 2024-08-05 | 주식회사 마하테크 | Oil detection device on the sea |
| KR102672058B1 (en) * | 2022-12-02 | 2024-06-04 | 주식회사 마하테크 | Oil detection device on the sea |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0774780B2 (en) | 1995-08-09 |
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