JPS6269147A - Measuring method for visibility - Google Patents
Measuring method for visibilityInfo
- Publication number
- JPS6269147A JPS6269147A JP20976085A JP20976085A JPS6269147A JP S6269147 A JPS6269147 A JP S6269147A JP 20976085 A JP20976085 A JP 20976085A JP 20976085 A JP20976085 A JP 20976085A JP S6269147 A JPS6269147 A JP S6269147A
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting part
- per unit
- light emitting
- unit area
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/538—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke for determining atmospheric attenuation and visibility
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は空港や港湾あるいは高速道路等に於いて即座に
かつ正確に視程を計測する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for instantly and accurately measuring visibility at airports, ports, expressways, etc.
〈従来の技術及びその問題点〉
従来からの視距離測定法としては、単分散エアロゾル（
全て同一１；ηｆｆ： ０） ｉ！数粒子から成る）気
体の理論により霧中を走る光の減光係数σを計算しＫｏ
ｓｃｈｍ ｉ ｅｄｅｒの式Ｖ＝３／σ又は３９／σに
よって視距離Ｖを算出ずろ方法や、目視対電物から来る
光をホトセルで光電変換してアナログ電圧を出力し、エ
アロゾルに、１ろ散乱光のみを計算し減光係数σを求め
、同し／、 Ｋｏｓｅｈｍｉｅｄｅｒの式によ−）で視
距離■を算出する方法がある。<Conventional technology and its problems> The conventional visual distance measurement method uses monodisperse aerosol (
All the same 1; ηff: 0) i! Calculate the attenuation coefficient σ of light traveling through fog using the theory of gases (consisting of several particles), and calculate Ko
The visual distance V is calculated using the formula V = 3/σ or 39/σ of Schm i Eder, and the light coming from an electrical object is photoelectrically converted with a photocell and outputted as an analog voltage, and then scattered into an aerosol. There is a method in which only the light is calculated, the attenuation coefficient σ is determined, and the viewing distance (■) is calculated using the equation of Kosehmieder.
しかるにこれらの方法は、多分散エアロ゛ｊル（種々の
粒径の微粒子から成る）気体の１総合的効果としての減
光係数σの算出過程で、１：立１￥分市の精密測定には
成功をしていても多分散モデルの尤に対する反応の数学
的解析が非常に困カｆであるという問題点かあり、又視
距離ｖを求める際に物体の背景から来る光を直接測定す
る事なく単に無限遠を見た時の光量で置きｆｆ１ｉでい
ろ為に物体の背景に比較的近くの森や山がある場合には
視距離■に大きな誤差が出ろという問題点があった。However, these methods cannot be used for precise measurements of 1:1 in the process of calculating the extinction coefficient σ as a comprehensive effect of polydisperse aerosol gas (consisting of fine particles of various particle sizes). Even if successful, the problem is that the mathematical analysis of the response to the likelihood of the polydispersity model is extremely difficult, and when calculating the viewing distance v, the light coming from the background of the object must be directly measured. Since the light intensity when looking at infinity is simply set at ff1i, there is a problem in that if there is a relatively nearby forest or mountain in the background of the object, there will be a large error in the viewing distance (■).
〈問題点を解決する為の手段〉
本発明では上述の諸問題を解決せ／しとするものてあり
、その要旨は発光部と近似黒体部と照度シＹ２とを具備
する被視体と、観δｔＩＩ用固体力に５・とを用い、被
視体発光部の充放ｑ４をＯとし近似黒体部υ）単位面積
あｆコりの明るさを１１及びそのイＹ景光の単位面積あ
ノ：りの明ろざｌとを測定（７、次いで被視体発光部か
ら光放射を行ないその時の発光部の単位面積あたりの明
るさ壜３を測定し、又−１−記照度言１により外来光の
単位面積あたりの明るさ・＼（０）＜ｉ’ｆ求め、これ
らの３１．′″＆、−３及びＡ（０）Ｊり個々の物体の
視程を計算する方法である。<Means for Solving the Problems> The present invention aims to solve the above-mentioned problems. , using 5 for the solid force for the view δtII, and assuming the charging and discharging q4 of the light-emitting part of the object to be O as O, the brightness of the approximate black body υ) unit area A is 11 and the unit of Y scene light. Measure the area (7), then emit light from the light emitting part of the subject, measure the brightness per unit area of the light emitting part at that time, and -1- illuminance According to the formula 1, the brightness per unit area of the external light is determined by \(0)<i'f, and the visibility of each object is calculated using these 31.''&, -3 and A(0)J. be.
〈実施例及び作用〉
以下本発明方法を、それを実施する装置を示す図面を参
酌し乍ら詳述する。<Embodiments and Operations> The method of the present invention will be described in detail below with reference to the drawings showing an apparatus for carrying out the method.
第１図は本発明方法で用いる装置の一例を示す説明図で
あり、被視体（１）と観測用固体カメラ（２）とをある
距離を隔て＼対面状に配設しでいろ１、被視体（１）（
ま第２図に示す様に発光部（３）、近似黒体部（４）及
び照度Ｓ↑（５）を具備しており、又固体力ノラ（２）
は第３図に示ず様に望遠レシズを内ａ Ｌ を二遮光筒
（１３）を有し、かつマイコン式制御装置（７）と接続
されている。FIG. 1 is an explanatory diagram showing an example of the apparatus used in the method of the present invention, in which a subject (1) and an observation solid-state camera (2) are arranged face-to-face with a certain distance apart. Subject (1) (
As shown in Fig. 2, it is equipped with a light emitting part (3), an approximate black body part (4), and an illuminance S↑ (5), and also has a solid force polarity (2).
As shown in FIG. 3, the telephoto lens a L has two light-shielding tubes (13), and is connected to a microcomputer type control device (7).
被視体（１）の内部構造を第４図に示すが、この様に光
源からの光Ｉｆ Ｌ、ンズによって平行光線となされ、
固体Ｊｊメ一２（２）へ、向って放射するもので、例又
は第Ｊ 鼎−（不ず様な固体）！メラ（２）がその受光
面に把犬Ｉ−映像をマイコシ式制御装置（７）へ送り込
むのであり、従ってこの被視体の映像はその、ｔ゛・マ
イコシ式制御装置（７）内の主記憶装置に格納された画
像と解してもよい。The internal structure of the object to be viewed (1) is shown in FIG.
It radiates towards a solid Jj Mei 2 (2), an example or J ding - (unusual solid)! The camera (2) sends the dog I-image to the Mycosi type control device (7) on its light receiving surface, and therefore the image of this object is sent to the main body in the t'Maikosi type control device (7). It may also be understood as an image stored in a storage device.
さて光を贈詩了の浮遊ずろ気体（エアロ・ｊル気体）に
入射させろと、光は散乱、吸収され入射光の強度は次第
（ζ減衰して行く。入射光が平行光線の場合この関係は
しｆｏｅ”で与左られ、この式ばＢｏｕｇｕｅｒ （又
は■、ａｎＩｌ＋ｅｒｔ−Ｂｅｅｒｊの法則と呼ばれて
いる。ここＣＩｏは入射光の初期強度、■は光が距離ｅ
ｆ″！、け進／１ｔ′点の強度、（Σは微粒子の減光係
数である。Now, when light is incident on a floating aerosol gas (aero gas), the light is scattered and absorbed, and the intensity of the incident light gradually (ζ attenuates).If the incident light is a parallel ray, this relationship This formula is called the law of Bouguer (or ■, anIl + ert-Beerj. Here, CIo is the initial intensity of the incident light, and
f''!, extremity/1t' intensity, (Σ is the attenuation coefficient of the fine particles.
このＢｏｕｇｕｃｒの法則を、地上に於ける任意物体の
観測に適用すると
物体から出た光に対し Ｂ＋（Ｎ）−田（０）ｅ物
体の背景から来る光に対し
Ｂ２ （／ ｌ−謁（０） ｅ”
太陽、夜間照明等からの散乱光に対し
Ｂヨ Ｄ’ ）＝ ８３ （”） （１−ｅ
）従って、物体の位置（１−０１でのコント−ノ
スｉ、ｃ（０）は、
Ｃ（０）−三昔刊■＝ ）＋１
物体から距離ｅの位置てのコントラスト（■１シ、Ｂ＋
（０） 、 Ｂ２ （０１ ＩＩ！各’２ Ｂ＋ （
ｉ’ ）、 Ｂ２ （１）（７’）Ｊ−０に於ける値で
あり、またＢ３（”）は８３（１りのｅ−無限大に於け
る極限値である。［３３（ｆりはｄＢ／ｄｌ−−σＢ十
Ｂａなる（数分方程式を積分して（）でおり、Ｂ３（■
） ＝ Ｂａ／σである。ｎａｔａｌ：弔位反当りの太
陽光の混入量、σＢは単位長当りの散乱によろａ魔少量
である３、
本方式では、近似的に取り扱一つ−〇いるが、より精密
なＷｌ！Ｉ定をしたいとき（ま、太陽光のふりそ＼ぐ角
度に応じて、８３（・η）＝Ｂａ／ａの８３ （ω）が
異なることを指摘しておく。Applying Bougucr's law to the observation of an arbitrary object on the ground, for the light emitted from the object B + (N) - 田 (0) e for the light coming from the background of the object B2 (/ l - audience (0 ) e" B yo D' ) = 83 (") (1-e
) Therefore, the position of the object (contonus i, c(0) at 1-01 is C(0)-3) = )+1 The contrast at the distance e from the object (■1, B+
(0), B2 (01 II! Each '2 B+ (
i' ), B2 (1) (7') is the value at J-0, and B3 ('') is the limit value at 83 (1 e-infinity. [33 (f r is dB/dl--σB+Ba (integrated fractional equation is (), and B3(■
) = Ba/σ. natal: The amount of sunlight mixed in per unit length, σB, is a small amount due to scattering per unit length3. In this method, it is handled approximately as follows, but Wl! is more precise. When you want to determine the I constant (well, I should point out that 83 (ω) of 83 (・η) = Ba/a differs depending on the angle of the sunlight.
本発明方法では、固体カメラ（２）内の受光素子又はカ
メラフィルタを人の目の分光特性である標準比視感度特
性のものとして、又被視体の発光部（３）をマイコン式
制御装置（７）からの指令で点滅自在としておき次の測
定を行なう。即ら、波視体発光部の光放射を０（光源減
灯）として測定をする。その結果、近似黒体部（第２図
４）の表面の単位面積あたりの明るさ′！Ａ１と、その
背景光（第５図６）の単位面積当りの明るさ遣２が得ら
れる。In the method of the present invention, the light-receiving element or camera filter in the solid-state camera (2) has a standard luminous efficiency characteristic that is the spectral characteristic of the human eye, and the light-emitting part (3) of the object to be viewed is controlled by a microcomputer-based control device. With the command from (7), the light is set to blink freely and the next measurement is performed. That is, the measurement is performed with the light emission of the wave optic body light emitting section set to 0 (light source dimmed). As a result, the brightness per unit area of the surface of the approximate black body (Fig. 2, 4)'! A1 and the brightness ratio 2 per unit area of the background light (FIG. 5, 6) are obtained.
ここて、固体カメラと被視体の間の距離馬は一定で既知
であるので、式（１）から、次式を得る。Here, since the distance between the solid-state camera and the subject is constant and known, the following equation is obtained from equation (1).
但し式（２）では、減光係数σと太陽等散乱光極限値Ｂ
３（Ｏｏ）及び、背景光初期値Ｂ２ （０）は未知数の
ま５である。However, in equation (2), the attenuation coefficient σ and the solar equiscattered light limit value B
3 (Oo) and the background light initial value B2 (0) are unknown quantities.
次に被視体発光部の光放射を行なって測定をする。）
物体光の観測値を１３、光源の初期値を既知としＢ＋（
０）とすると、次式を得ろ。Next, the measurement is performed by emitting light from the light emitting section of the object. ) Assuming that the observed value of the object light is 13 and the initial value of the light source is known, B+(
0), obtain the following equation.
１３−８１ （アｌ）） ＋８３ （Ｊ？ｏ）−Ｂｒ
（＆ｏ）’Ｍ＋（注）１１は式（１）で得ｌこもの
一’、１３−’Ａ１−Ｂｒ （ｆｆｏ ｌ −８＋’
（０） ｅ”（注）Ｂ：（０１≠８＋（０）、゛、σ−
女旬ｅ缶 式（３）
上記の′！１１３の観測に於いては、エアロゾルによる
光束の拡散が生じているが、この拡散分を画像処理プロ
グラムで除去して召ヨを観測する。13-81 (Al)) +83 (J?o)-Br
(&o)'M+(Note) 11 is obtained by formula (1), 13-'A1-Br (ffo l -8+'
(0) e” (Note) B: (01≠8+(0), ゛, σ-
Female e-can formula (3) above'! In the observation of No. 113, the light flux is diffused due to aerosol, but this diffusion is removed by an image processing program and the image is observed.
この様にして得られた、エアロゾルの減光係数σを式（
２）に代入すると、
となって太陽等の散乱光の極限値Ｂ３ （ω）及び背景
光初期値Ｂ２ （０）が求、上る、。The attenuation coefficient σ of the aerosol obtained in this way is calculated using the formula (
2), the limit value B3 (ω) of scattered light from the sun, etc. and the initial value B2 (0) of background light are found.
さて物体の固有の明るさＢ＋（０）は、その物体がおか
れている場所の現環境、現在時刻下に於ける明るさＡ
（０）に、その物体の光に対する反射率（アルベド）γ
を乗じたものである。即ら、Ｂ＋ （０） −＝ ｆ
Ａ （０） 式（５）但し、その物体が白から
も光を放射しているときには、放射光強度をＤ（０）と
して
Ｂ＋’（０）−デ’Ａ （０） 十Ｄ （０）
式（６）ｔは、自発光時に於ける外来光に対ずろ反射率
である。（’７’ｚＯと近似し＝Ｃ差しつかんのないと
きがある。）
ｆは、まさに物体固イＪのものであるが物体に当る光の
色によっても異なる値をとるのでコンピュータに記憶さ
せろ場合に、色毎に記憶させておく事が重要である。Now, the inherent brightness B+(0) of an object is the brightness A in the current environment where the object is placed and at the current time.
(0), the reflectance (albedo) of the object for light γ
It is multiplied by That is, B+ (0) −= f
A (0) Equation (5) However, if the object emits light from the white side, the intensity of the emitted light is set to D(0) and B+'(0)-De'A (0) 10D (0)
Equation (6) t is the reflectance of external light during self-emission. (Approximate to '7'zO = C There are times when it is unavoidable.) f is exactly the value of the object J, but it takes a different value depending on the color of the light hitting the object, so it is necessary to store it in the computer. It is important to memorize each color.
本発明方法では、外来光強度Ａ（０）は照度計（５）に
よって実測され、式（５）又（よ式（６）（但しｊ’ｚ
Ｏ）によって８＋（Ｑ）又はＢ＋（０１が計算できる。In the method of the present invention, the external light intensity A(0) is actually measured by an illuminance meter (5), and is expressed by equation (5) or (yo equation (6) (where j'z
8+(Q) or B+(01) can be calculated by O).
式（３）によってエアロゾル減光係数σ、式（４）によ
って太陽や夜間照明の光の散乱による観測光軸への混入
量の極限値Ｂ３ （α））、背景光の初期値Ｂ２（０）
が１−１られ、さらに照度計による観測によって物体の
固有の明るさＢ＋（０）が求まる。また自発光物体の放
射強度Ｄ（０）は、被視体発光部の放射強度の切換によ
って幾通りかに別けて数式に代入して行くことが出来る
。かくしてコシＩ・ラストＣ（４）はＣ（’ ）−＋汗
Ｈｌ 式（７）
％式％（０）
として、物体から任意の距離ｅに於けろコシトラス１−
Ｃ（１）が算出できる。Equation (3) gives the aerosol attenuation coefficient σ, Equation (4) gives the limit value B3 (α) of the amount of light that enters the observation optical axis due to scattering of light from the sun and night lighting, and the initial value B2 (0) of the background light.
is calculated by 1-1, and the intrinsic brightness B+(0) of the object is determined by observation using an illuminance meter. Furthermore, the radiation intensity D(0) of the self-luminous object can be divided into several ways and substituted into the formula by switching the radiation intensity of the light emitting part of the object. Thus, stiffness I and last C(4) are C(' )-+sweat Hl Formula (7) % formula %(0) At any distance e from the object, stiffness 1-
C(1) can be calculated.
しかも、このＣ（ａ）は色々な反ｒ＋−を率ｒをもつ物
体の個／Ｚについて、現実の測定環境下でＣ（／ｌが如
何なる値をとるのかが計算できろし、自発光体（こ対し
てもＢ＋（＃）−イ（０） ｘ ｅ″とおくこと（こ上
ってｃ（Ｂを求められる。（Ｂ＋（０）は自発光体の放
射光強度）
〈発明の効果〉
以上述へて来た本発明方法によれば、襞間て太陽光の強
度が大あるいは夜間照明の強度が大の様な場合でもそれ
らの光に影響されろ事なく、シかも固イｆの物体毎の視
程を正直ｉ：に求める′ｆ（が出来ろものである。Furthermore, it is possible to calculate the value of C(/l) under the actual measurement environment for various anti-r + - objects with ratio r. (For this as well, set B + (#) - I (0) x e'' (By going up, c (B can be found. (B + (0) is the emitted light intensity of the self-luminous body) <Effects of the invention 〉 According to the method of the present invention described above, even when the intensity of sunlight or nighttime lighting is high between the folds, the area between the folds will not be affected by the light, and there will be no problem. It is possible to honestly find the visibility of each object in i: 'f(.
即ら、従来の方法では、
８２ （０） −Ｂ３ （＝：０１と仮定、Ｃ（＋り−
・Ｃ（０）ｅ−２０を１すてイｔ：ｏこれはＫｏｓｃｈ
ｍｉｃｄｃｒの公式と、Ｌばれろ周知の公式である。上
記に於いて、我々のたてた式に８２ （０） ＝ ８３
（α〕）を代入ずろと、Ｃ（１）＝Ｃ（０）ｅ が
得られる事が確ｊ、３されている。しかし、物体の背景
が遠方の天空で満たされているときはＢｚ （０） −
８３（■）として良いが物体の背賊に比較的近くの森、
山等が入っている場合は、背賊光の主たるものが、それ
等の森や山に当った太陽光や夜間照明の散乱光になるの
で、太陽光や夜間照明光の強度が大のときにはＢ２ （
０） ＝ ８３ （ω）と仮定してはいけないのである
。その意味で８２ （０）と８３（・η）とを基本的に
別個のものとした本発明方法は、Ｋｏｓｃｈｍｉｏｅｄ
ｅｒ氏の明記した公式導出条件を正しく理解した装置と
なる点て、従来の方式とは全く異なろ新１７い方式てあ
り、従来昼間に於いて又は夜間照明の明るい場所での測
定誤差（人に上る視程の実測値と装置に、Ｌる実測値と
の差）が大きく出ていたのである。That is, in the conventional method, assuming that 82 (0) -B3 (=:01, C(+ri-
・Throw away one C(0)e-20:o This is Kosch
These are the micdcr formula and the well-known Lbarero formula. In the above, our formula is 82 (0) = 83
It is certain that by substituting (α]), we obtain C(1)=C(0)e. However, when the background of the object is filled with the distant sky, Bz (0) −
83 (■) is good, but the forest is relatively close to the object's traitor,
If there are mountains, etc., the main source of light will be scattered light from sunlight or night lights that hit those forests or mountains, so if the intensity of sunlight or night lights is high, B2 (
0) = 83 (ω) should not be assumed. In this sense, the method of the present invention, in which 82 (0) and 83 (·η) are basically separate, is
It is a new method that is completely different from the conventional method in that it is a device that correctly understands the formula derivation conditions specified by Mr. Er. There was a large difference between the actual measured value of visibility and the actual value measured by the equipment.
更に、従来の方法ては、Ｋｏｓｃｈｍｉｏｅｄｅｒの公
式％式％
はＣ１，０５−ｅ−”となろｅを視程と定義してるが、
これはｅ−０に於ける固有コントラス１．ｃ（０）が大
なるほど遠方からその物体を見分は易くなるという実体
験に反する定義であり、本発明方法では、実測と計算か
らＣ（０）とびとを割り出し、ｃＢ）そのものを算出し
ている点て、従来相対的であ一〕ｔコ視程の定義を絶対
化したと評せられろ。このことは反射率の異なる物体を
次／７と取換又で、現実の測定環境に置く実験を計算に
よ−）て：ＪＥ、ニレ・−１−ｊ、て、物体毎の視程を
算出ずろ画期的なシステムを実現する。この事は従来の
相対的視程の定義からは導出する事が不＋１１能であっ
た。Furthermore, in the conventional method, Koschmioeder's formula % defines C1,05-e-'' and e as the visibility,
This is the unique contrast 1. at e-0. This definition is contrary to actual experience, which states that the larger c(0) becomes, the easier it is to distinguish the object from a distance.In the method of the present invention, C(0) intervals are determined from actual measurements and calculations, and cB) itself is calculated. It can be said that the definition of visibility, which was previously relative, has been made absolute. This can be calculated by exchanging objects with different reflectances as follows and placing them in the actual measurement environment. Realize a revolutionary system. It was impossible to derive this fact from the conventional definition of relative visibility.
第１図は本発明方法で用いる計測装置の概要説明図、第
２図は第１図に於けるＡ−Ａ矢視図、第３図は第１図に
於けろＢ−Ｂ矢視図、第４図は被視体の内部構造説明図
、第５図は固体カメラの把えろ映像の説明図。
図中、 （１）被視体
（２）固体力、メラ
（３）発光部
（４）近似黒体部
（５）照度計
（６）遮光筒
（７）マイコン式制御装置FIG. 1 is a schematic explanatory diagram of the measuring device used in the method of the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, and FIG. 3 is a view taken along the line B-B in FIG. FIG. 4 is an explanatory diagram of the internal structure of the object to be viewed, and FIG. 5 is an explanatory diagram of an image captured by a solid-state camera. In the figure: (1) Subject (2) Solid force, camera (3) Light emitting part (4) Approximate black body part (5) Illuminance meter (6) Light shield tube (7) Microcomputer type control device
Claims (1)
、観測用固体カメラとを用い、被視体発光部の光放射を
０とし近似黒体部の単位面積あたりの明るさをＹ＿１及
びその背景光の単位面積あたりの明るさＹ＿２とを測定
し、次いで被視体発光部から光放射を行ないその時の発
光部の単位面積あたりの明るさＹ＿３を測定し、又上記
照度計により外来光の単位面積あたりの明るさＡ（０）
を求め、これらのＹ＿１、Ｙ＿２、Ｙ＿３及びＡ（０）
より個々の物体の視程を計算する方法。1. Using a subject equipped with a light-emitting part, an approximate blackbody part, and an illuminance meter, and a solid-state camera for observation, set the light emission of the light-emitting part of the subject to 0, and calculate the brightness per unit area of the approximate blackbody part. Measure the brightness Y_1 and the brightness per unit area of the background light Y_2, then emit light from the light emitting part of the object and measure the brightness Y_3 per unit area of the light emitting part at that time. Brightness per unit area of external light A(0)
Find these Y_1, Y_2, Y_3 and A(0)
A way to calculate the visibility of more individual objects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20976085A JPS6269147A (en) | 1985-09-20 | 1985-09-20 | Measuring method for visibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20976085A JPS6269147A (en) | 1985-09-20 | 1985-09-20 | Measuring method for visibility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6269147A true JPS6269147A (en) | 1987-03-30 |
| JPH0531100B2 JPH0531100B2 (en) | 1993-05-11 |
Family
ID=16578173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20976085A Granted JPS6269147A (en) | 1985-09-20 | 1985-09-20 | Measuring method for visibility |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6269147A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01141339A (en) * | 1987-11-27 | 1989-06-02 | Mitsubishi Electric Corp | Smog transmittivity measuring instrument |
| JP2004037474A (en) * | 2003-10-17 | 2004-02-05 | Mitsubishi Electric Corp | Laser radar device |
| EP1596185A1 (en) * | 2004-05-10 | 2005-11-16 | C.R.F. Società Consortile per Azioni | Visibility measuring system and method |
| WO2007104925A2 (en) * | 2006-03-11 | 2007-09-20 | University Of Durham | Optical transmissometer and light source and light detector for such optical transmissometer |
| CN102539386A (en) * | 2012-01-09 | 2012-07-04 | 北京大学 | Forward scattering type visibility meter based on white light, and visibility measurement method thereof |
-
1985
- 1985-09-20 JP JP20976085A patent/JPS6269147A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01141339A (en) * | 1987-11-27 | 1989-06-02 | Mitsubishi Electric Corp | Smog transmittivity measuring instrument |
| JP2004037474A (en) * | 2003-10-17 | 2004-02-05 | Mitsubishi Electric Corp | Laser radar device |
| EP1596185A1 (en) * | 2004-05-10 | 2005-11-16 | C.R.F. Società Consortile per Azioni | Visibility measuring system and method |
| WO2007104925A2 (en) * | 2006-03-11 | 2007-09-20 | University Of Durham | Optical transmissometer and light source and light detector for such optical transmissometer |
| WO2007104925A3 (en) * | 2006-03-11 | 2007-12-06 | Univ Durham | Optical transmissometer and light source and light detector for such optical transmissometer |
| CN102539386A (en) * | 2012-01-09 | 2012-07-04 | 北京大学 | Forward scattering type visibility meter based on white light, and visibility measurement method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0531100B2 (en) | 1993-05-11 |
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