SU1350490A2 - Device for remote measurement of oil film thickness on water pool surface - Google Patents

Abstract

The invention relates to a measuring technique, to technical means of express control of the amount of spilled oil used from the ship’s side, on the buoys and from the overpass, and is an improvement of the known device according to author's certificate No. 1010523. The purpose of the additional invention is to increase the reliability and accuracy of measuring film thickness. oil on the surface of water bodies with an inhomogeneous concentration of suspended substances in the surface layer of water, due to the illumination of the water surface is completely linearly polarized and measuring light L depot Reese atsii scattered light. The device contains a source 1 of modulated optical radiation and photoreceivers 3 and 4, measuring the radiation reflected and scattered from the water surface, the optimizer 2 installed along the beam after the source 1 of modulated optical radiation, the analyzer 5 installed in front of the photoreceiver 4 can be rotated around its axis and fixation in two positions, at one of which its transmission plane is parallel to the transmission plane of polarizer 2, and at. another is perpendicular to this plane. 4 il. Q S (L 00 ate H)

Description

The invention relates to a measuring technique and can be used as a technical tool for express control of the amount of spilled oil used from the ship’s side, on the buoys and from the overpass, and is an improvement to the device by author. No. 1010523.

The purpose of the invention is to increase the reliability and ACCURACY of measuring the thickness of an oil film on the surface of water bodies that have an inhomogeneous concentration of suspended substances in the surface layer of water, by illuminating the water surface with completely linearly polarized light and measuring the depolarization of scattered light.

FIG. 1 is a schematic diagram of a device for remotely measuring the thickness of an oil film on the surface of water bodies; FIGS. 2-4 show calibration / dependencies.

The device contains a wideband source 1 of modulated optical radiation, the optical axis of which forms a small angle (0 ° C /

 5) with a normal to the water surface, a polarizer 2, the transmission plane of which is parallel to the plane including the optical axis of the source 1 of the modulated optical radiation at a point lying on the surface of the water, the first photodetector 3, the second photodetector 4, the optical axis of which forms the / 5 40 angle - so with the optical axis of the source 1 of the modulated optical radiation, and the intersection point of these axes is buried 0.5-2 to 2 in the height of the wind waves, analyzer 5, the optical axis of which coincides with the optical axis of the second photodetector a 4 and which is made movable with the possibility of rotation around its optical axis and fixing in two positions, when its transmission plane is parallel and perpendicular to the transmission plane of the polarizer 2, the electronic recording unit 6 and the outrigger boom 7., which is located in the nose parts of the vessel above the undisturbed water surface of the vessel.

The device works as follows.

The light from the source 1 of modulated optical radiation through a polarisation 2 is directed to a clean water surface. With the first photo

3, the reflected signal is measured using the second photoparsed signals y „

at .

g at the positions of the transmission plane of the analyzer 5, parallel and perpendicular to the transmission plane of the polarizer 2, and stored and; x in the electronic recording unit 6. Then the beam is sent to the controlled water surface. Using the first and second photodetectors 3 and 4, the signals are measured respectively.

0

five

X

n

neither

5 X ,, and X

eight

UN "AND

If X ,, 7

Compare signals

Y in II or y and j and y gj.

nx

 Have

Xgi a

Umh ui

or

gj, this means that a thin film with a thickness of less than 10 microns has been detected on the water surface. The Xj, / Xg ratios judge the film thickness, for example, using a calibration gauge to interpret the data.

dependence hj), where the film thickness of the oil.

h, if X n

n 1

at

-at

CNM HC

or

JJ, then the depolarization ratios are additionally determined

D.

D "

 Zl

vm

-ZH-L.

-I, jjg

W H II

With D n Dg (i.e., with equal concentrations of suspended solids in the surface layer of water in areas of the reservoir with a clean and controlled water surface), there is a thick film of oil with a thickness of more than 10 microns on the surface of the reservoir. In this case, the film thickness can be judged using the calibration dependence

where u

- f (-) g fC,),

 2

Un1, -; at 6

 .

611

hij is the oil film thickness. At D (7, Dg (i.e. at different concentrations of suspended solids), it is assumed in the first approximation that there is a film more than 10 microns thick on the surface of the reservoir. In this case, the concentration of suspended solids in the controlled region p is determined from D value using calibration dependence p f (D). The magnitude of the scattered radiation is found

Y &

 II +

2

ysi

which must comply with p with a clean water surface, is -. the benefit of the calibration dependence is (/), the film thickness is judged by the calibration dependence for h. If it turns out that the film thickness should be less than 10 µm, then the film thickness should be determined from the calibration dependence for h using the signal ratios of the first receiver 3.

At x

6

oil on film

absent in all cases.

The calibration dependences are constructed by comparing the readings of photodetectors 3 and 4 with the concentration of suspended solids and film thickness measured by any contact method.

Claims (1)

Invention Formula Device for remote measurement of oil film thickness on hh2, MKM 100 liters 80- 60- itQ- ZOO oh g 350490 surface of water bodies by author. No. 1010523, characterized in that, in order to improve the reliability and accuracy of measuring the film thickness of oil on the surface of water bodies that have a non-uniform concentration of matter in the surface layer of water, it is equipped with a polarizer installed with the modulated optical source radiation in such a way that its transmission plane is parallel to the plane passing through the optical 15 axis of the source of modulated optical radiation, an analyzer installed in the course of the radiation before the second photodetector can be rotated around its axis and fixed 20 in two positions, with one of which its transmission plane is parallel to the polarization transmission plane, and with the other, it is perpendicular to this plane. 0.6 0,8 G, 0 U, / Ub L O.SCH Yu W 30 0 FIG. 3 YU 20 JO FIG. four Editor N. Gunko Co-Counsel L.Lobzova Tehred L. Oliynyk Proofreader M. Demchik Order 5249/40 Circulation 677 Subscription VNIIPI USSR State Committee ... on inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Manufactured polygraphic. Enterprise, Uzhgorod, Projecto st., 4 50 60 fi, mz // f 4f / 7 J,