SU610036A1

SU610036A1 - Method of visual-instrumental determining of visibility range

Info

Publication number: SU610036A1
Application number: SU742022792A
Authority: SU
Inventors: Елена Николаевна Довгялло; Владимир Александрович Ковалев; Игорь Николаевич Нечаев
Original assignee: Dovgyallo Elena N; Kovalev Vladimir A; Nechaev Igor N
Priority date: 1974-05-14
Filing date: 1974-05-14
Publication date: 1978-06-05

Description

11р6меи уточного экрана и по отсиету на шкале прибора наход т приборный параметр Pj , Этим же прибором измер ют cooTjrt.шеиие ркостей промежуточного экрана и неба у горизонта и по отсчету на шкале прибора наход т приборный параметр Р 2. The 11p6 of the weft screen and the instrument on the scale of the instrument find the instrument parameter Pj. The same instrument measures the cooling temperature of the intermediate screen and sky at the horizon and the instrument parameter P 2 is measured on the instrument scale.

По полученным соотношени м ркостей объекта, промежуточного экрана и неба наход т контраст, который нужен дл оценки видимостиAccording to the obtained ratios of the object, the intermediate screen and the sky, the contrast is found, which is needed to assess the visibility

К--1 - JK - 1 - J

где к - контраст, который имел бы объект под дымкой, если бы он проектировалс на фоне неба у горизонта; - порог контрастной чувствительности гпаза (величина посто нна ).where k is the contrast that an object would have under the haze if it were designed against the sky at the horizon; —gpaz contrast sensitivity threshold (constant value).

Использ; полученное значение контраста , определ ют дальность видимостиUse; the obtained contrast value determines the visibility range

, btni btni

tnKe-lnCl-t2p,Pi) tnKe-lnCl-t2p, Pi)

где U - рассто ние от наблюдател до объекта наблюдени ;where U is the distance from the observer to the object of observation;

KQ- контраст не покрытого дымкойKQ-contrast is not covered with haze

Claims

object with sky background, t, e, true contrast. Invention Formula

The method of instrumental and visual determination of the visibility range by determining the contrast of an object with the sky background at the horizon, characterized in that, in order to be able to measure objects that are not projected onto the sky background under the conditions of a closed horizon, established between him and the borrower near the lines of sight of the intermediate screen projecting against the sky at the horizon, as well as the ratio of the velocities of the intermediate screen and the background of the sky at the horizon, according to the values of which with the parameter. Sources of information taken into account during the examination:

1, Sternzat M, S, Meteorological instruments and surveillance. L., Gidrometizdat, 1968., p. 311-323.

2. Gavrilov B, A, Visibility in the atmosphere L. Gidrometizdat, 1968 p. 81, 256

v; v: 5 ;;; j sj; : j