周囲騒音が
超音波測距に
及ぼす影響
The effect of surrounding sound
for ultrasonic rangefinder
The Vertex Hypsometer users often report that
the surrounding sound such as waterfall or cicada
sometimes disturb ultrasonic distance measurement
between tansponder and instrument.
This phenomena derives from Instruments receiver
unable to distinguish ultrasound reflected by transponder
and ultrasound inclusive surrounding sound such as
waterfall, cicad or exhorst noise of forestry machines.
Sweden Haglof 社製超音波式距離・測高計
バーテックスを滝のそば、蝉の音声や機械音の
環境で使用すると測距が不可能となることがあります。
これは測定機の受信器が周囲騒音に含まれる超音波成分と
応答器 から反射されて戻ってくる超音波とを区別できない
ことによります。
検証をいくつか試みたので報告します。
対策にも成功したのでお問い合わせ下さい。
Forestry Mensuration, Environmental, Products, news, miscellaneous | 15.07.2009 2:51 | Comments Off
Spiegel Relaskop
The relaskos are principally known in connection with
angle-count sampling(ACS),a method which determines
basal area density in forests by a simple counting method.
The relaskop automatically connects any inclination in the line of sight
making it posible to easily find stand basal area in square meters per hectar
either at breast height ( 1.3 m above the ground or any other height.)
The relaskop offer quite a few other measurement applications
in practical and scientific forestry.
* Determining horizontal distance with automatic correction
for the angle of inclination
*Measurement of Total tree height, or heights to particullar
upper stem diameter.
*Measurement of upper stem diameters at particular heights.
*Quick determination of "slenderness"(height /diameter ratio)
of standing tree.
*Determinsation of from heights.,and the volumes of standing
trees by Preesler’s formula.
*Relaskops are the pricippe instrument of " variable plot sampling "
which has a special advantage.
Forestry Mensuration, Products, miscellaneous | 9.09.2008 0:34 | Comments Off
