JPS6161354B2 - - Google Patents
Info
- Publication number
- JPS6161354B2 JPS6161354B2 JP54064431A JP6443179A JPS6161354B2 JP S6161354 B2 JPS6161354 B2 JP S6161354B2 JP 54064431 A JP54064431 A JP 54064431A JP 6443179 A JP6443179 A JP 6443179A JP S6161354 B2 JPS6161354 B2 JP S6161354B2
- Authority
- JP
- Japan
- Prior art keywords
- snow
- level
- signal
- reference signal
- comparator
- 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
Links
- 238000013459 approach Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02845—Humidity, wetness
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は超音波を使用して雪面の雪質を検出す
る超音波雪質感知器に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an ultrasonic snow texture detector that detects the quality of snow on a snow surface using ultrasonic waves.
従来の技術
一般に、雪質によつて超音波の反射率が変化す
ることが知られており、圧雪では反射率が高く、
新雪では反射率が低い。従来では雪面に超音波を
発射し、その反射受波信号を整流平均化して反射
受波信号の振幅に応じた検出信号とし、検出信号
のレベルが高ければ雪面の雪質は圧雪、レベルが
低ければ新雪であるとして処理されている。Conventional technology It is generally known that the reflectance of ultrasonic waves changes depending on the quality of the snow, and the reflectance is high in compacted snow.
Reflectance is low in fresh snow. Conventionally, ultrasonic waves are emitted onto the snow surface, and the reflected and received signals are rectified and averaged to produce a detection signal that corresponds to the amplitude of the reflected and received signals.If the level of the detection signal is high, the snow quality on the snow surface is compacted or level. If the snow is low, it is treated as fresh snow.
発明が解決しようとする問題点
このような従来の構成では、得られた雪質情報
によつて超音波式積雪計が求めた積雪情報を補正
しようとすると、その全体構成が複雑化する問題
がある。Problems to be Solved by the Invention With such a conventional configuration, when attempting to correct the snow information obtained by the ultrasonic snow gauge using the obtained snow quality information, the overall configuration becomes complicated. be.
本発明は積雪情報の補正用に使用した場合にお
いてもその全体構成を簡単にできる超音波雪質感
知器を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic snow texture detector whose overall configuration can be simplified even when used for correcting snow cover information.
問題点を解決するための手段
本発明の超音波雪質感知器は、上方から雪面へ
トーンバースト状超音波を発射する送信系と、前
記雪面からの反射波を受信する受信系と、前記反
射波の受波信号に対する参照信号を出力する信号
発生手段と、前記反射波の受波信号のレベルと前
記参照信号のレベルを比較して受波信号のレベル
が参照信号のレベルを越える度に信号を出力する
比較器と、この比較器の出力に発生するパルス信
号数を計数してその計数値が予め設定された計数
値に近づくよう前記信号発生手段に参照信号のレ
ベル変更を指示する制御部とを設け、参照信号の
レベルを雪質に対応した雪積情報として出力する
ことを特徴とする。Means for Solving the Problems The ultrasonic snow texture detector of the present invention includes a transmitting system that emits tone burst-shaped ultrasonic waves from above to the snow surface, and a receiving system that receives reflected waves from the snow surface. a signal generating means for outputting a reference signal for the received signal of the reflected wave; and a signal generating means that compares the level of the received signal of the reflected wave with the level of the reference signal, and each time the level of the received signal exceeds the level of the reference signal. a comparator that outputs a signal to the output of the comparator, and instructs the signal generating means to change the level of the reference signal so that the counted value approaches a preset counted value by counting the number of pulse signals generated at the output of the comparator. The present invention is characterized in that it includes a control section and outputs the level of the reference signal as snow cover information corresponding to snow quality.
作 用
この構成により、比較器に印加する参照信号の
レベルを制御して雪質情報を得るため、超音波積
雪計と組合せる場合には、超音波反射時刻から前
記比較器の出力に最初の反射波受波信号が発生す
る時刻までの時間差に基づいて積雪深さを算出す
るように構成するだけで、測定積雪深さに雪面の
反射率の補正に実施したことと同じであり、全体
構成を簡単にできるものである。Effect With this configuration, since snow quality information is obtained by controlling the level of the reference signal applied to the comparator, when combined with an ultrasonic snow gauge, the first output from the comparator is adjusted from the ultrasonic reflection time. Simply configuring the structure to calculate the snow depth based on the time difference between the times when the reflected wave reception signal occurs is the same as correcting the measured snow depth and the reflectance of the snow surface, and the overall It can be easily configured.
実施例
以下、本発明の実施例を図面に基づいて説明す
る。第1図は超音波雪質検出器の構成を示し、1
は後述の各装置の制御ならびに外部からの情報に
よつて雪質の判定を行うよう構成された制御部
で、例えばマイクロコンピユータから成る。2は
超音波トーンバースト波を制御部1の指示に従つ
て発射する送信系で、発振器2a、トーンバース
ト発生回路2b、増幅器2c、送信ヘツド2dか
ら構成され、発振器2aは超音波周波数〔周常は
20KHZ〜40KHZ程度〕の正弦波を連続的に出力
し、トーンバースト発生回路2bは制御部1によ
つて制御され発振器2a出力を断続〔例えば5m
S出力し、50mS停波の繰返し〕して、所謂トー
ンバースト波を出力する。また増幅器2cを介し
たトーンバースト発生回路2bの出力のトーンバ
ースト波を空中に発射する送信ヘツド2dは、上
方から地表に向けて発射可能に所定高さに配設さ
れている。3は雪面からの反射波を受信する受信
系で、受信ヘツド3aと増幅器3bで構成され、
受信ヘツド3aは送信ヘツド2dから発射された
トーンバースト波が雪面で反射して入射したもの
を電気信号の変換すべく所定高さに配設されてい
る。3cは比較器で、増幅器3dを介した受信ヘ
ツド3aの出力信号のレベルと参照信号3dのレ
ベルとを比較し、受信ヘツド3a側出力レベルが
参照信号3dのレベルを越える度にパルスPを出
力する。なお、参照信号3dはデジタル・アナロ
グ変換器4を介して前記制御部1が与える。Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. Figure 1 shows the configuration of an ultrasonic snow quality detector.
A control unit is configured to control each device described below and to determine snow quality based on information from the outside, and is composed of, for example, a microcomputer. Reference numeral 2 denotes a transmission system that emits ultrasonic tone burst waves according to instructions from the control unit 1, and is composed of an oscillator 2a, a tone burst generation circuit 2b, an amplifier 2c, and a transmission head 2d. teeth
The tone burst generating circuit 2b continuously outputs a sine wave of about 20 KHZ to 40 KHZ], and the tone burst generating circuit 2b is controlled by the control unit 1 to output an intermittent sine wave of the oscillator 2a [for example, 5 m
50 mS and then stop for 50 mS] to output a so-called tone burst wave. Further, a transmitting head 2d that emits into the air the tone burst wave output from the tone burst generating circuit 2b via the amplifier 2c is arranged at a predetermined height so as to be able to emit it from above toward the ground surface. 3 is a receiving system that receives reflected waves from the snow surface, and is composed of a receiving head 3a and an amplifier 3b.
The receiving head 3a is arranged at a predetermined height to convert the tone burst waves emitted from the transmitting head 2d, reflected by the snow surface, into electrical signals. A comparator 3c compares the level of the output signal of the receiving head 3a via the amplifier 3d with the level of the reference signal 3d, and outputs a pulse P each time the output level of the receiving head 3a exceeds the level of the reference signal 3d. do. Note that the reference signal 3d is provided by the control section 1 via the digital-to-analog converter 4.
制御部1はパルス数計数手段1eと補正手段1
fおよびデジタル信号発生手段1hから構成さ
れ、パルス数計数手段1eは比較器3cの出力の
パルスPを計数し、補正手段1fはパルス数計数
手段1eの計数値が予め設定されたパルス数でな
いときにデジタル信号発生手段1hの発生するデ
ジタル信号Dを変化させて、前記デジタル・アナ
ログ変換器4出力の参照信号3dのレベルを変更
してパルス数計数手段1eの前記計数値を設定パ
ルス数に近づけるように作用する。また、補正手
段1fは現在指示してあるデジタル信号の状況と
パルス数計数手段1eの計数値とから雪面での反
射率を計算して、反射率が低ければ新雪、高けれ
ば圧雪と判定して、これを雪質情報として端子1
gに送出する。 The control section 1 includes a pulse number counting means 1e and a correction means 1.
The pulse number counting means 1e counts the pulses P of the output of the comparator 3c, and the correction means 1f counts the pulses P of the output of the comparator 3c, and the correction means 1f counts the pulses P when the counted value of the pulse number counting means 1e is not a preset number of pulses. The digital signal D generated by the digital signal generating means 1h is changed to change the level of the reference signal 3d output from the digital-to-analog converter 4, so that the counted value of the pulse number counting means 1e approaches the set number of pulses. It works like this. Further, the correction means 1f calculates the reflectance on the snow surface from the status of the currently instructed digital signal and the count value of the pulse number counting means 1e, and determines that if the reflectance is low, it is fresh snow, and if the reflectance is high, it is compacted snow. Then, use this as snow quality information and connect it to terminal 1.
Send to g.
次に圧雪時の信号波形を示す第2図と新雪時の
信号波形を示す第3図に基づいて制御部1と姿較
器3cの動作を詳細に説明する。なお、第2図
a,bと第3図a,bでは何れもaが増幅器3b
から比較器3cへの入力信号、bは比較器3cの
出力信号である。 Next, the operations of the control unit 1 and the comparator 3c will be described in detail based on FIG. 2 showing signal waveforms during compacted snow and FIG. 3 showing signal waveforms during fresh snow. Note that in both FIGS. 2 a and b and 3 a and b, a is the amplifier 3b.
b is the input signal to the comparator 3c, and b is the output signal of the comparator 3c.
送信系2のトーンバースト発生回路2bに発生
が指示されると、トーンバースト発生回路2bは
発振器2aの発振信号を所定時間だけ増幅器2c
へ送出する。この発振信号は増幅器2cで増幅さ
れ送信ヘツド2dから雪面に向けて超音波として
発射される。 When the tone burst generation circuit 2b of the transmission system 2 is instructed to generate, the tone burst generation circuit 2b transmits the oscillation signal from the oscillator 2a to the amplifier 2c for a predetermined period of time.
Send to. This oscillation signal is amplified by an amplifier 2c and emitted as an ultrasonic wave from a transmission head 2d toward the snow surface.
雪面からの超音波の反射波は受信系3の受信ヘ
ツド3aで受信され、増幅器3bで増幅される。
比較器3cは、第2図のように増幅器3bで増幅
された反射波受波信号Aがデジタル・アナログ変
換器4の参照信号3dのレベルBを越えるたびに
パルスPを送出する。このパルスPはパルス数計
数手段1eで計数され、補正手段1fに送出され
る。補正手段1fはパルス数と参照信号3dのレ
ベルに対応するデジタル信号とを比較して、反射
信号の反射率を計算し、第2図aのように反射率
が大きければ圧電として判定し、パルス数が第3
図bのように所定個数の5個より少ない場合に
は、補正手段1fは反射率が小さいと判定して新
雪の雪質情報を端子1gに送出し、デジタル信号
発生手段1hに参照信号3dのレベルをB′から
B″に下げるよう信号を送出する。参照信号3d
をレベルB″にしてパルス数計数手段1eの計数
値が所定個数の5個となつていれば、次回の受波
信号の検出に際しても、この参照信号3dのレベ
ルB″が採用される。このようにして雪質情報が
送出され、さらに雪質に応じて、反射波受波信号
に対する参照信号のレベルが補正されることとな
る。 The reflected ultrasonic waves from the snow surface are received by the receiving head 3a of the receiving system 3 and amplified by the amplifier 3b.
The comparator 3c sends out a pulse P every time the reflected wave reception signal A amplified by the amplifier 3b exceeds the level B of the reference signal 3d of the digital-to-analog converter 4, as shown in FIG. This pulse P is counted by the pulse number counting means 1e and sent to the correction means 1f. The correction means 1f compares the number of pulses with a digital signal corresponding to the level of the reference signal 3d, calculates the reflectance of the reflected signal, and if the reflectance is large as shown in FIG. 2a, it is judged as piezoelectric, and the pulse number is third
If the number is less than the predetermined number of 5 as shown in Figure b, the correction means 1f determines that the reflectance is small and sends the snow quality information of the fresh snow to the terminal 1g, and sends the reference signal 3d to the digital signal generation means 1h. level from B′
Send a signal to lower it to B''.Reference signal 3d
If the pulse count is set to level B'' and the count value of the pulse number counting means 1e reaches the predetermined number of 5, the level B'' of the reference signal 3d will be adopted when detecting the next received signal. In this way, the snow quality information is transmitted, and the level of the reference signal for the reflected wave reception signal is further corrected according to the snow quality.
上記実施例において制御部1は、雪質判定の動
作のみを行うように説明したが、デジタル・アナ
ログ変換器4を介して受信レベルを調整しつつ、
前記トーンバースト波発射から雪面による反射波
を受波するまでの時間差を求めることにより、こ
の時間差と、音速およびヘツド高さ等の定数か
ら、雪面の反射率の変化による計測誤差を補償し
た積雪深さが求められる。つまり、この場合には
第4図に示すように、制御部1に積雪深さ判定手
段1cと送信指示手段1aを増設して、積雪深さ
判定手段1cが比較器3cの出力信号から最初に
受波されたタイミングを検出するよう構成されて
いる。 In the above embodiment, it has been explained that the control unit 1 performs only the operation of determining snow quality, but while adjusting the reception level via the digital-to-analog converter 4,
By determining the time difference between emitting the tone burst wave and receiving the reflected wave from the snow surface, we compensated for measurement errors due to changes in the reflectance of the snow surface using this time difference and constants such as the speed of sound and head height. Snow depth is required. In other words, in this case, as shown in FIG. 4, the snow depth determination means 1c and the transmission instruction means 1a are added to the control unit 1, so that the snow depth determination means 1c first receives the output signal from the comparator 3c. It is configured to detect the timing at which the wave is received.
第4図を詳しく説明する。操作者の指示等によ
り送信情報が端子1bに着信すると、送信指持手
段1aは前記トーンバースト発生回路2bにトー
ンバースト波の発生を指示し、積雪深さ判定手段
1cにトーンバースト発生開始時刻を指示する。
積雪深さ判定手段1cは送信指示手段1aのトー
ンバースト発生開始時刻と前記比較器3cのパル
スPの到達時刻とを比較してその時間差および音
速ならびにヘツド高さ等の定数から積雪の深さを
判定し、積雪深さ情報を端子1dに送出する。 FIG. 4 will be explained in detail. When transmission information arrives at the terminal 1b according to an operator's instruction, the transmission instruction means 1a instructs the tone burst generation circuit 2b to generate a tone burst wave, and informs the snow depth determination means 1c of the tone burst generation start time. Instruct.
The snow depth determination means 1c compares the tone burst generation start time of the transmission instruction means 1a and the arrival time of the pulse P of the comparator 3c, and determines the snow depth from the time difference and constants such as the speed of sound and the head height. It makes a judgment and sends snow depth information to terminal 1d.
つまり、雪面の雪質にかかわらず比較器3cの
参照信号3dのレベルがBの場合、雪質が第2図
のような圧雪ではなくて第3図のような反射率の
低い新雪である場合、受波信号A′が最初にレベ
ルBを横切るタイミングT1は、反射率の高い圧
雪時のそのタイミングT2に比べて遅れるため、
この反射率の違いによる受波信号検出の時間遅れ
が測定結果の積雪深さ誤差となつて現われる。し
かし、第4図のように比較器3cに印加されてい
る参照信号3dが雪質に応じて変更される場合に
は、雪面が新雪であつても反射波受波信号A′が
参照信号3dのレベルB″は最初に横切るタイミ
ングT3(なお、T3≒T2である)を反射波受信時
刻と判定して処理でき、タイミングT1のように
遅れがないため、雪面の反射率に左右されず、正
確な積雪深さを算出できる。 In other words, if the level of the reference signal 3d of the comparator 3c is B regardless of the snow quality of the snow surface, the snow quality is not compact snow as shown in Fig. 2, but fresh snow with low reflectance as shown in Fig. 3. In this case, the timing T 1 when the received signal A′ first crosses level B is delayed compared to the timing T 2 when the snow is packed with high reflectivity.
A time delay in detecting the received signal due to this difference in reflectance appears as an error in the snow depth in the measurement result. However, if the reference signal 3d applied to the comparator 3c is changed according to the snow quality as shown in FIG. 4, even if the snow surface is fresh snow, the reflected wave received signal A' Level B'' of 3d can be processed by determining the first crossing timing T 3 (T 3 ≒ T 2 ) as the reflected wave reception time, and since there is no delay like timing T 1 , the reflection on the snow surface Accurate snow depth can be calculated regardless of the rate.
発明の効果
以上説明のように本発明の超音波雪質感知器
は、上方から雪面へトーンバースト状超音波を発
射する送信系と、前記雪面からの反射波を受信す
る受信系と、前記反射波の受波信号に対する参照
信号を出力する信号発生手段と、前記反射波の受
波信号のレベルと前記参照信号のレベルを比較し
て受波信号のレベルが参照信号のレベルを越える
度に信号を出力する比較器と、この比較器の出力
に発生するパルス信号数を計数してその計数値が
予め設定された計数値に近づくよう前記信号発生
手段に参照信号のレベル変更を指示する制御部と
を設け、参照信号のレベルを雪質に対応した雪質
情報として出力するため、超音波を使用して雪面
の雪質を知ることができる。Effects of the Invention As explained above, the ultrasonic snow texture detector of the present invention includes: a transmitting system that emits tone burst-shaped ultrasonic waves from above to the snow surface; a receiving system that receives reflected waves from the snow surface; a signal generating means for outputting a reference signal for the received signal of the reflected wave; and a signal generating means that compares the level of the received signal of the reflected wave with the level of the reference signal, and each time the level of the received signal exceeds the level of the reference signal. a comparator that outputs a signal to the output of the comparator, and instructs the signal generating means to change the level of the reference signal so that the counted value approaches a preset counted value by counting the number of pulse signals generated at the output of the comparator. Since the control unit outputs the level of the reference signal as snow quality information corresponding to the snow quality, it is possible to know the snow quality of the snow surface using ultrasonic waves.
また、比較器に印加されている参照信号のレベ
ルを受波信号のレベルに追従させているため、雪
面にトーンバースト状超音波を発射して、この発
射時刻から反射波を受信するまでに要する時間
と、音速および送受ヘツドの取付高さ等の定数に
基づいて積雪深さを算出するように構成された超
音波積雪計と組合せる場合には、前記比較器の出
力信号が最初に発生した時刻を超音波積雪計にお
ける反射波受信時刻することによつて、比較器の
部分を雪質感知用と積雪深さ測定用とに共用する
ことが出来、しかもこのように比較器の部分を両
者で共用した場合には構成が簡単になるばかりで
なく、特別な補正回路を設けずとも雪面の雪質変
化による積雪深さの計折測誤差を補償することが
出来、正確な積雪深さの測定に寄与できるもので
ある。 In addition, since the level of the reference signal applied to the comparator follows the level of the received signal, the tone burst-shaped ultrasonic wave is emitted onto the snow surface, and from the time of emission until the reflected wave is received. When combined with an ultrasonic snow gauge configured to calculate the snow depth based on the required time, the speed of sound, and the mounting height of the transmitting/receiving head, the output signal of the comparator is generated first. By using the time when the reflected wave is received in the ultrasonic snow gauge, the comparator part can be used both for snow texture detection and snow depth measurement. If both are used in common, the configuration will not only be simpler, but it will also be possible to compensate for measurement errors in snow depth due to changes in snow quality without the need for a special correction circuit, allowing for accurate snow depth. This can contribute to the measurement of
第1図は本発明の超音波雪質感知器の一実施例
のブロツク図、第2図は同実施例の圧雪時の動作
説明図、第3図は同実施例の新雪時の動作説明
図、第4図は他の実施例のブロツク図である。
1……制御部、1e……パルス数計数手段、1
f……補正手段、1h……デジタル信号発生手
段、2……送信系、2a……発振器、2b……ト
ーンバースト発生回路、2c……増幅器、2d…
…送信ヘツド、3……受信系、3a……受信ヘツ
ド、3b……増幅器、3c……比較器、3d……
参照信号、4……デジタル・アナログ変換器。
Fig. 1 is a block diagram of an embodiment of the ultrasonic snow texture detector of the present invention, Fig. 2 is an explanatory diagram of the operation of the same embodiment during compacted snow, and Fig. 3 is an explanatory diagram of the operation of the same embodiment during fresh snow. , FIG. 4 is a block diagram of another embodiment. 1...Control unit, 1e...Pulse number counting means, 1
f... Correction means, 1h... Digital signal generation means, 2... Transmission system, 2a... Oscillator, 2b... Tone burst generation circuit, 2c... Amplifier, 2d...
...Transmission head, 3...Reception system, 3a...Reception head, 3b...Amplifier, 3c...Comparator, 3d...
Reference signal, 4...Digital-to-analog converter.
Claims (1)
射する送信系と、前記雪面からの反射波を受信す
る受信系と、前記反射波の受波信号に対する参照
信号を出力する信号発生手段と、前記反射波の受
波信号のレベルと前記参照信号のレベルを比較し
て受波信号のレベルが参照信号のレベルを越える
度に信号を出力する比較器と、この比較器の出力
に発生するパルス信号数を計数してその計数値が
予め設定された計数値に近づくよう前記信号発生
手段に参照信号のレベル変更を指示する制御部と
を設け、参照信号のレベルを雪質に対応した雪質
情報として出力する超音波雪質感知器。1. A transmitting system that emits tone burst-shaped ultrasonic waves from above to the snow surface, a receiving system that receives reflected waves from the snow surface, and a signal generating means that outputs a reference signal for a received signal of the reflected waves. a comparator that compares the level of the received signal of the reflected wave with the level of the reference signal and outputs a signal every time the level of the received signal exceeds the level of the reference signal; and a pulse generated at the output of this comparator. and a control section that counts the number of signals and instructs the signal generating means to change the level of the reference signal so that the counted value approaches a preset counted value, and adjusts the level of the reference signal to a level corresponding to the snow quality. Ultrasonic snow texture detector that outputs information.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6443179A JPS55156882A (en) | 1979-05-24 | 1979-05-24 | Ultrasonic sensor for snow quality |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6443179A JPS55156882A (en) | 1979-05-24 | 1979-05-24 | Ultrasonic sensor for snow quality |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55156882A JPS55156882A (en) | 1980-12-06 |
JPS6161354B2 true JPS6161354B2 (en) | 1986-12-25 |
Family
ID=13258070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6443179A Granted JPS55156882A (en) | 1979-05-24 | 1979-05-24 | Ultrasonic sensor for snow quality |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55156882A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5676076A (en) * | 1979-11-26 | 1981-06-23 | Omron Tateisi Electronics Co | Measuring device for depth of snow cover |
JPS6110766A (en) * | 1984-06-27 | 1986-01-18 | Nissan Motor Co Ltd | Surface condition detector |
JPS61205089U (en) * | 1985-06-14 | 1986-12-24 |
-
1979
- 1979-05-24 JP JP6443179A patent/JPS55156882A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS55156882A (en) | 1980-12-06 |
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