JPH01305392A - Snowfall detecting apparatus - Google Patents
Snowfall detecting apparatusInfo
- Publication number
- JPH01305392A JPH01305392A JP63136738A JP13673888A JPH01305392A JP H01305392 A JPH01305392 A JP H01305392A JP 63136738 A JP63136738 A JP 63136738A JP 13673888 A JP13673888 A JP 13673888A JP H01305392 A JPH01305392 A JP H01305392A
- Authority
- JP
- Japan
- Prior art keywords
- snowfall
- snow
- detection
- attached
- shielding plate
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 79
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000004925 Acrylic resin Substances 0.000 abstract description 5
- 229920000178 Acrylic resin Polymers 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 241000533950 Leucojum Species 0.000 description 15
- 238000001028 reflection method Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、降雪４片での反射光により降雪状態を検知し
て屋根等に設置された雪処理装置等を制御することので
きる赤外線拡散反射方式（雪片反射方式）の降雪検知装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is an infrared diffusion system that can detect snowfall conditions by light reflected from four pieces of snow and control snow processing equipment installed on roofs, etc. The present invention relates to a snowfall detection device using a reflection method (snowflake reflection method).
［従来技術・背景技術」
従来、この種の赤外線拡散反射方式（雪片反射方式）の
降雪検知装置の一例として、第３図及び第４図に示す構
成のものがあった。[Prior Art/Background Art] Conventionally, as an example of this type of infrared diffuse reflection method (snowflake reflection method) snowfall detection device, there has been a structure shown in FIGS. 3 and 4.
この降雪検知装置は、降雪を検知する降雪検知部１と、
コントロール部２とから構成されている。降雪検知部１
の前面には、赤外線の発光素子３と、その受光素子４と
が並列に設置されており、降雪検知部ｌの前面には、光
電素子面の着氷雪を防止するため所定長の防雪フード５
が前方に突出されている。そこで、発光素子３から発射
された赤外線は、前方の降雪４片６で反射し、受光素子
４で検知されることにより降雪信号を出力する。This snowfall detection device includes a snowfall detection section 1 that detects snowfall,
It is composed of a control section 2. Snowfall detection part 1
An infrared light-emitting element 3 and its light-receiving element 4 are installed in parallel on the front surface of the sensor, and a snow protection hood 5 of a predetermined length is installed on the front surface of the snowfall detection section l to prevent ice and snow from accumulating on the photoelectric element surface.
is projected forward. Therefore, the infrared rays emitted from the light emitting element 3 are reflected by the snowflakes 6 in front and detected by the light receiving element 4, thereby outputting a snowfall signal.
コントロール部２は、上記の降雪信号を一定時間カウン
トして、降雪強度を表示すると共に、コントロール部２
の出力で屋根等に設置された雪処理装置を制御して自動
的に除雪や融雪等の処理を行なうのである。The control unit 2 counts the above-mentioned snowfall signal for a certain period of time, displays the snowfall intensity, and also displays the snowfall intensity.
The output is used to control the snow removal equipment installed on the roof, etc., and automatically perform processes such as snow removal and snow melting.
「発明が解決しようとする問題点」
−ＩＩＱに、拡散反射形光電素子の検出領域特性は、降
雪４片を反射物体とする場合、その反射面積が極めて小
さいため、検出距離は極めて短くなる。また、検出物体
の大きさに対しても例えば、直径数ｍ／ｍの雪片の検出
距離は極めて短い。しかも雪片は複雑な形状をしている
ため、赤外線の送光面または受光面に正対している面積
は更に小さく、乱反射を余儀なくされるので、その検出
距離は一層短くなる。"Problems to be Solved by the Invention" IIQ: Regarding the detection area characteristics of the diffuse reflection type photoelectric element, when four pieces of falling snow are used as reflective objects, the reflection area is extremely small, so the detection distance is extremely short. Furthermore, with respect to the size of the detection object, for example, the detection distance of a snowflake with a diameter of several meters/meter is extremely short. Moreover, since the snowflake has a complicated shape, the area directly facing the infrared transmitting or receiving surface is even smaller, and the infrared rays are inevitably reflected diffusely, making the detection distance even shorter.
従って、拡散反射形光電素子による降雪４片の検知は、
可及的に光電面の近傍で行なうことが望ましいが、検知
部には、風雪に晒して使用するので、通常、光電面の着
雪、氷結を防止するため、光電面から所定長の防雪フー
ドを突出させているので、それだけ検出距離が長くなり
検出感度が悪化する。Therefore, the detection of four flakes of snow by a diffuse reflection type photoelectric element is as follows:
It is preferable to do this as close to the photocathode as possible, but since the detection unit is exposed to wind and snow, it is usually installed with a snow protection hood extending a specified length from the photocathode to prevent snow and ice from accumulating on the photocathode. Since it is made to protrude, the detection distance becomes longer and the detection sensitivity deteriorates accordingly.
そこで、従来は光電素子のパワーを大きくして検出領域
を拡大し、その領域内に点在する雪片数の個数を増大す
ることにより検知感度を高め、降雪検知を可能にしてい
る。そのためＬＥＤ （発光素子）を３個も使用した特
殊な拡散反射形光電素子を利用せざるを得なかった。そ
れでも無風時の雪片の大きな降雪形態時には有効に機能
しても、気温が低下して細かい雪片の時や風がでてくる
と次第に検知機能は低下し、遂には降雪検知が全く不可
能になる状況がしばしば見受けられた。Conventionally, therefore, the power of the photoelectric element is increased to enlarge the detection area, and the number of snowflakes scattered within the area is increased, thereby increasing the detection sensitivity and making it possible to detect snowfall. Therefore, it was necessary to use a special diffuse reflection type photoelectric element that uses as many as three LEDs (light emitting elements). Even so, even if it works effectively when there are large snowflakes when there is no wind, the detection function gradually decreases when the temperature drops and there are small snowflakes or when the wind picks up, and eventually it becomes impossible to detect snowfall at all. The situation was often observed.
これらの原因を考えて見るに、これは検知領域の問題よ
り雪片の降下速度に対する光電素子の応答速度の問題と
いうべきである。Considering these causes, this problem should be more a problem of the response speed of the photoelectric element to the falling speed of the snowflake than a problem of the detection area.
今、雪片の降下速度をＡ、ｃｍ／ｓ、検知領域の検知幅
をＡｚｃｍとすれば、この検知幅内を雪片が通過するに
要する時間ｔｌは、
ｔ＋ ＝Ａ２ ／Ａ、Ｘ １０’ ｍｓとなる。Now, if the falling speed of the snowflake is A, cm/s, and the detection width of the detection area is Azcm, the time tl required for the snowflake to pass within this detection width is t+ = A2 /A, X 10' ms. Become.
また、光電素子の応答速度をｔ ２ｍＳとすれば、降雪
検知を可能にするためにはｔ＋＞ｔｔでなければならな
い。Further, if the response speed of the photoelectric element is t2mS, then t+>tt must be satisfied in order to enable snowfall detection.
このｔｌを大きくするため、Ａ２の検知幅を広げる努力
がなされ、前記のＬＥＤを３個も使用した特殊な光電素
子が利用されてきた。それでも検知幅の増加はＬＥＤを
並べた垂直方向に対してのみで、水平方向の検知幅は２
５ｍ／ｍ〜３０ｍ／ｍと小さいため、少し風が出て降雪
が水平方向に傾いてくると、検知感度は低下し、遂には
検知不能な状態となるものである。In order to increase this tl, efforts have been made to widen the detection width of A2, and special photoelectric elements using as many as three of the above-mentioned LEDs have been used. Even so, the detection width increases only in the vertical direction where the LEDs are arranged, and the detection width in the horizontal direction increases by 2.
Since it is small at 5 m/m to 30 m/m, when a slight wind blows and snow falls tilts in the horizontal direction, the detection sensitivity decreases and eventually becomes undetectable.
これに対処するためには、水平方向にもＬＥＤを並べて
検知幅を左右に拡大すれば良いが、これは得策な方法と
は言えず、光電素子の応答速度を早めて、雪片に対する
相対的検知幅を拡大するのがより有効である。To deal with this, it is possible to expand the detection width to the left and right by lining up the LEDs horizontally, but this is not a good idea, and the response speed of the photoelectric element is increased to detect the snowflakes relative to each other. It is more effective to expand the width.
また、従来の降雪検知装置の降雪検知部及び防雪フード
は、冠雪な防止するため、加熱装置により一定温度に加
温されているが、その温度制御には、例えば、温度セン
サーにより外気温を検知して設定温度以下になると自動
的に加熱する方法がとられている。しかし、この方法で
は外気温が設定温度以上になると降雪とは無関係に動作
するので、エネルギ効率が悪かった。In addition, the snowfall detection part and snow protection hood of conventional snowfall detection devices are heated to a constant temperature by a heating device in order to prevent snow capping. A method is used that automatically heats up when the temperature is detected and falls below a set temperature. However, this method was inefficient in energy efficiency because it operated regardless of snowfall when the outside temperature exceeded the set temperature.
本発明は、上記の欠点に鑑みて成されたもので、応答速
度が１ｍｓ以下と通常の２０〜３０倍の高速性を有する
拡散反射形光電素子を使用することによって、相対的に
検知幅を２０〜３０倍に拡大すると共に、防雪フードを
排除して光電面の数ｍ／ｍ 、あるいは十数ｍ／ｍとい
う極めて近傍で降雪４片を検出できるように構成して、
いかなる降雪形態に対しても忠実に降雪検知を行なうこ
とができると共に、積雪処理装置を自動制御することの
できる降雪検知装置を提供するのが目的である。The present invention was made in view of the above-mentioned drawbacks, and uses a diffuse reflection type photoelectric element with a response speed of 1 ms or less, which is 20 to 30 times faster than a normal one, thereby relatively increasing the detection width. In addition to magnifying the photocathode 20 to 30 times, the snow hood is removed and it is configured to detect four flakes of snow at a distance of several meters/m or more than ten meters/m from the photocathode.
It is an object of the present invention to provide a snowfall detection device that can faithfully detect snowfall in any form of snowfall and can automatically control a snow processing device.
「問題点を解決するための手段」
上記の問題点を解決するために、降雪検知装置は高速応
答性の拡散反射形光電素子から成る降雪検知部と、該降
雪検知部の直前に取付けた透光性の防雪板と、該防雪板
に付設した自動温度制御機能を有する面状発熱体と（温
度が上昇すると電気抵抗が大きくなり、通電量が自動的
に減少して異常加熱を防止する発熱体）から構成したも
のである。"Means for Solving the Problems" In order to solve the above problems, the snowfall detection device has a snowfall detection section consisting of a fast-responsive diffuse reflection type photoelectric element, and a transparent snowfall detection section installed just before the snowfall detection section. A light-sensitive snow prevention board and a planar heating element attached to the snow prevention board that has an automatic temperature control function (as the temperature rises, the electrical resistance increases and the amount of current is automatically reduced to prevent abnormal heating) body).
また、上記の降雪検知部により検出された降雪信号によ
り面状発熱体及び積雪処理装置を制御するように構成し
たものである。Further, the snowfall signal detected by the snowfall detection section described above is configured to control the planar heating element and the snow treatment device.
「作 用」
そこで、拡散反射形光電素子の降雪検知部から降雪４片
に赤外線を照射し、雪片からの反射光を降雪検知部で受
光して降雪を検知する。その検知信号を一定時間カウン
トし、そのトータルカウンタ数により降雪の強度を測定
すると共に、屋根等に設置された積雪処理装置等を制御
して自動的に雪処理等の動作が行なわれる。"Function" Therefore, the snowfall detection section of the diffuse reflection type photoelectric element irradiates infrared light onto the four snowflakes, and the snowfall detection section receives the reflected light from the snowflakes to detect snowfall. The detection signals are counted for a certain period of time, and the intensity of snowfall is measured based on the total counter number, and operations such as snow removal are automatically performed by controlling a snow treatment device installed on the roof or the like.
ここで、上記の降雪検知の際、防雪板が降雪検知部の直
前に取付けられているので、降雪検知は降雪検知部の直
前で行なわれることになり、その検知は高感度になる。Here, in the snowfall detection described above, since the snow protection plate is attached just before the snowfall detection section, the snowfall detection is performed immediately before the snowfall detection section, and the detection becomes highly sensitive.
また、防雪板は面状発熱体により加温されてるので、防
雪板及び降雪検知器の冠雪を防止することができる。更
に、面状発熱体は降雪検知部により検出された降雪信号
、即ち、降雪状態に応じて加熱されるので、エネルギの
無駄がない。Further, since the snow protection board is heated by the planar heating element, it is possible to prevent the snow protection board and the snowfall detector from being covered with snow. Furthermore, since the planar heating element is heated according to the snowfall signal detected by the snowfall detection section, that is, the snowfall state, there is no wastage of energy.
「発明の実施例」
第１図は本発明に係る降雪検知装置を構成する降雪検知
部の斜視図で、第２図は降雪検知部の作用説明図を示す
。Embodiments of the Invention FIG. 1 is a perspective view of a snowfall detection section constituting a snowfall detection device according to the present invention, and FIG. 2 is an explanatory diagram of the operation of the snowfall detection section.
本発明の降雪検知装置は、降雪検知部ｌと、コントロー
ル部２とから構成されている。降雪検知部１の検知素子
には、発光素子３と、その受光素子４とから構成される
拡散反射形光電素子が使用されているが、その応答速度
は１ｍｓ以下と、通常の２０〜３０倍の高速性のものが
使用されている。従って、相対的に検知幅を２０〜３０
倍に拡大したことになり、いかなる降雪形態に対しても
忠実に降雪検知を行なうことができる。The snowfall detection device of the present invention includes a snowfall detection section 1 and a control section 2. The detection element of the snowfall detection unit 1 uses a diffuse reflection type photoelectric element consisting of a light emitting element 3 and its light receiving element 4, but its response speed is 1 ms or less, which is 20 to 30 times faster than normal. A high-speed version is used. Therefore, the relative detection width is 20 to 30
This means that the area has been enlarged twice, and snowfall can be detected faithfully regardless of the form of snowfall.
このような拡散反射形光電素子の発光素子３と受光素子
４は、検知ケース５の前面に並列状態では取付けられて
いる。The light emitting element 3 and the light receiving element 4 of such a diffuse reflection type photoelectric element are mounted in parallel on the front surface of the detection case 5.
また、上記の降雪検知部ｌには、光電素子の直前におい
て、光電素子面°の損傷防止、雪の付着防止、氷結防止
等にために、赤外線を透過できる透光性の防雪板６を装
着するが、実施例では赤外線の吸収損失の少ないアクリ
ル樹脂板を用いている。しかし、アクリル樹脂板は９０
度Ｃ以上で変形するので、該樹脂板には、赤外線の透過
を阻止しない位置に、自動温度制御機能を有する面状発
熱体７を付設するが、この面状発熱体７は、赤外線の透
光性を阻害しないように、アクリル樹脂板６の裏面の外
周に取り付けられている。In addition, a transparent snow protection plate 6 that can transmit infrared rays is attached to the above-mentioned snowfall detection unit 1 immediately before the photoelectric element in order to prevent damage to the photoelectric element surface, snow adhesion, and ice formation. However, in the embodiment, an acrylic resin plate with little absorption loss of infrared rays is used. However, the acrylic resin board is 90%
Since the resin plate deforms at temperatures above Celsius, a planar heating element 7 with an automatic temperature control function is attached to the resin plate at a position that does not block the transmission of infrared rays. It is attached to the outer periphery of the back surface of the acrylic resin plate 6 so as not to inhibit optical properties.
そこで、発光素子３からアクリル樹脂板の防雪板６を透
過して発射された赤外線は、降雪４片８で反射され、そ
の反射光は受光素子４で受光されて降雪を検知する。こ
の降雪検知部１で検知された検知信号は、コントロール
部２で３分間または５分間の一定時間カウントされ、そ
のトータルカウンタ数により降雪の強度を測定すること
ができる。そして、このトータルカウンタ数により図示
しないが屋根等に設置した積雪処理装置等を制御して、
雪処理等の動作が自動的に行なわれる。Therefore, the infrared rays emitted from the light emitting element 3 after passing through the snow protection plate 6 made of an acrylic resin plate are reflected by the falling snow flakes 8, and the reflected light is received by the light receiving element 4 to detect snowfall. The detection signal detected by the snowfall detection section 1 is counted by the control section 2 for a fixed period of 3 minutes or 5 minutes, and the intensity of snowfall can be measured based on the total counter number. Then, based on this total counter number, a snow processing device installed on the roof etc. (not shown) is controlled,
Operations such as snow removal are automatically performed.
「発明の効果」
本発明は、上記のように降雪検知装置は高速応答性の拡
散反射形光電素子から成る降雪検知部１を用いたこと、
従来のような長尺な防雪フードではなく、降雪検知部１
の直前に防雪板６を装着したことにより、どのような降
雪状態に対しても高感度に的確な降雪検知が行なわれる
。"Effects of the Invention" The present invention provides that the snowfall detection device uses the snowfall detection section 1 made of a fast-responsive diffuse reflection type photoelectric element as described above;
Instead of a long snow protection hood like conventional ones, the snowfall detection unit 1
By attaching the snow protection plate 6 immediately before the snowfall, accurate snowfall detection can be performed with high sensitivity in any snowfall condition.
また、防雪板６は面状発熱体７により常に加熱されてる
ので、冠雪を防止することができると共に、面状発熱体
７は降雪検知部１により検出された降雪信号、即ち、降
雪状態に応じて加熱されるので、エネルギに無駄がなく
、コストを低減することができる。In addition, since the snow prevention plate 6 is constantly heated by the planar heating element 7, it is possible to prevent snow capping, and the planar heating element 7 responds to the snowfall signal detected by the snowfall detection unit 1, that is, the snowfall state. Since it is heated accordingly, there is no wastage of energy and costs can be reduced.
更に、上記の降雪検知部１により検出された降雪信号に
より屋根等に設置された積雪処理装置を制御して自動的
に除雪等の作業が行なわれ省力化することが可能となる
。Further, the snowfall signal detected by the snowfall detection section 1 described above controls a snow processing device installed on the roof or the like to automatically perform snow removal and other operations, thereby saving labor.
第１図は本発明に係る降雪検知装置を構成する降雪検知
部の斜視図で、第２図は同検知部の動作説明図、第３図
は従来の降雪検知装置の降雪検知部斜視図で、第４図は
同降雪検知部の動作説明図を示す。
１・・・降雪検知部、
２・・・コントロール部、
３・・・発光素子、
４・・・受光素子、
６・・・防雪板、
７・・・面状発熱体、
８・・・降雪４片。
特許出願人 東北電力株式会社
代理人 弁理士 大 津 洋 夫 第（図FIG. 1 is a perspective view of a snowfall detection section constituting a snowfall detection device according to the present invention, FIG. 2 is an explanatory diagram of the operation of the same detection section, and FIG. 3 is a perspective view of a snowfall detection section of a conventional snowfall detection device. , FIG. 4 is an explanatory diagram of the operation of the snowfall detection section. DESCRIPTION OF SYMBOLS 1... Snowfall detection part, 2... Control part, 3... Light emitting element, 4... Light receiving element, 6... Snow protection plate, 7... Planar heating element, 8... Snowfall 4 pieces. Patent Applicant Tohoku Electric Power Co., Inc. Representative Patent Attorney Hiroo Otsu (Fig.
Claims (3)
知部と、該降雪検知部の直前に取付けた透光性の防雪板
と、該防雪板に付設した自動温度制御機能を有する面状
発熱体とから構成したことを特徴とする降雪検知装置。(1) A snowfall detection unit consisting of a fast-responsive diffuse-reflection photoelectric element, a translucent snow protection plate installed just in front of the snowfall detection unit, and a surface with an automatic temperature control function attached to the snow protection plate. A snowfall detection device characterized by comprising a heating element.
り面状発熱体を制御するように構成したことを特徴とす
る第１項記載の降雪検知装置。(2) The snowfall detection device according to item 1, characterized in that the sheet heating element is controlled by a snowfall signal detected by the snowfall detection section.
り積雪処理装置を制御するように構成したことを特徴と
する第１項または第２項記載の降雪検知装置。(3) The snowfall detection device according to item 1 or 2, characterized in that the snowfall processing device is controlled by the snowfall signal detected by the snowfall detection section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63136738A JPH01305392A (en) | 1988-06-03 | 1988-06-03 | Snowfall detecting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63136738A JPH01305392A (en) | 1988-06-03 | 1988-06-03 | Snowfall detecting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01305392A true JPH01305392A (en) | 1989-12-08 |
Family
ID=15182352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63136738A Pending JPH01305392A (en) | 1988-06-03 | 1988-06-03 | Snowfall detecting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01305392A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03272492A (en) * | 1990-03-22 | 1991-12-04 | Yokokawa Uezatsuku Kk | Multisensor for snow information |
| JPH0566584U (en) * | 1992-02-19 | 1993-09-03 | 稔 山岸 | Snow cover detector |
| CN104535985A (en) * | 2014-12-31 | 2015-04-22 | 无锡中科光电技术有限公司 | Penetration device for laser radar |
| JP2017090382A (en) * | 2015-11-16 | 2017-05-25 | 株式会社デンソーウェーブ | Method, device, and program for detecting snow accretion on laser radar device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4514794Y1 (en) * | 1968-03-30 | 1970-06-22 | ||
| JPS5439149A (en) * | 1977-09-02 | 1979-03-26 | Toshiba Corp | Synchro/digital converter |
-
1988
- 1988-06-03 JP JP63136738A patent/JPH01305392A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4514794Y1 (en) * | 1968-03-30 | 1970-06-22 | ||
| JPS5439149A (en) * | 1977-09-02 | 1979-03-26 | Toshiba Corp | Synchro/digital converter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03272492A (en) * | 1990-03-22 | 1991-12-04 | Yokokawa Uezatsuku Kk | Multisensor for snow information |
| JPH0566584U (en) * | 1992-02-19 | 1993-09-03 | 稔 山岸 | Snow cover detector |
| CN104535985A (en) * | 2014-12-31 | 2015-04-22 | 无锡中科光电技术有限公司 | Penetration device for laser radar |
| JP2017090382A (en) * | 2015-11-16 | 2017-05-25 | 株式会社デンソーウェーブ | Method, device, and program for detecting snow accretion on laser radar device |
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