SU1672227A1 - Digital optical level meter - Google Patents

Abstract

This invention relates to discrete optical liquid level indicators. The aim of the invention is to expand the scope and increase noise immunity. The luminous flux from source 1 to measuring circuit 4 passes successively located emitting fiber-optic light guide 2, ends of radiating 5 and receiving 6 fibers located on diametrically opposite forming a still-pipe 7 placed in the center of the vessel 8 with liquid, and receiving fiber-optic light guide 3 in depending on the mutual arrangement of the liquid and the optical axis between the ends of the radiating and receiving fibers, which is fixed by the measuring circuit. 3 il.

Description

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This invention relates to discrete optical liquid level indicators.

The aim of the invention is to expand the scope and increase noise immunity.

Figure 1 shows a discrete optical level gauge, a general view; Fig. 2 is an electrical diagram of a meter; on FIG. 3 - the time diagram;

The device comprises a light source 1 connected to a radiating fiber optic light guide 2, a receiving fiber optic light guide 3. connected to the measuring circuit 4, while the ends of the radiating 5 and receiving 6 fibers of the respective optical fibers are located on the diametrically opposite forming the still-pipe 7, placed in the center of the vessel 8 with a liquid, have a common optical axis, passing at an angle to the surface of the liquid, and form n discrete measuring levels.

The measuring circuit contains a generator of 9 pulses, the output of which is connected in parallel to the n inputs of the instrument cluster 10 with charge coupling (CCD), consisting of n elementary quanta and to the first inputs of the n 11 elements, and n outputs of the CCD line are connected to the second inputs elements I. At the same time, the surface of each elementary CCD quantum is optically coupled to the corresponding fiber of the receiving fiber.

The device works as follows.

The luminous flux from source 1 to measuring circuit 4 passes successively located emitting fiber-optic light guide 2, the ends of radiating 5 and receiving 6 fibers located on diametrically opposite

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forming the still-pipe 7, placed in the center of the vessel 8 with the liquid, and the receiving fiber-optic light guide 3.

The ends of the emitting and receiving fibers, which are located in the stilling tube, are located on the same optical axis at an angle to the surface of the liquid and form n discrete measuring points.

Depending on the mutual arrangement of the fluid mirror and the optical axis between the ends of the emitting and receiving fibers, the illumination of the receiving fiber end varies, which is fixed by the measuring circuit. Three variants of their mutual arrangement are possible.

The fluid mirror is above the measuring points. In such a case, the ends of the radiating and receiving fibers are in the liquid. If the liquid is transparent, the luminous flux from the emitting fibers falls on the ends of the receiving fibers and through the receiving fiber-optic light guide enters the measuring circuit. If the liquid is opaque, the luminous flux from the radiating fibers does not reach the measuring circuit.

The fluid mirror intersects the optical axis between the ends of the emitting and receiving fibers and, therefore, the measuring circuit. The fluid mirror is located below the measuring pair of the emitting-receiving fiber, and the light flux through the end of the receiving fiber and the receiving light guide enters the measuring circuit.

The output end of the fiber of the receiving fiber, the input end of which is illuminated by the radiating fiber, as described above, illuminates the surface of the elementary quantum of the CCD 10 with which it has an optical link. In the substrate of the illuminated CCD cell, the light flux injects a charge whose magnitude is proportional to the illumination of its surface. A read pulse from the pulse generator 9 is fed simultaneously to the inputs of all the CCD cells and the first inputs of the AND circuit 11. The injection injected into the substrate of the illuminated CCD cell is transferred to the output of this cell by the read signal, is fed to the second input of the corresponding AND circuit and puts it into a single state . The circuits And, therefore, perform the role of the output buffer of the device and the role of the threshold device, since only the AND circuit is transferred to the single state, to the second input of which the injected charge of the required value is fed. The time diagram gives the following notation:

U ™ is the read pulse from the pulse generator;

Unaci Umcn input voltage l

CCD cells;

UNI - UNO - the state of the outputs of the AND elements,

The voltage at the outputs of the CCD cells appears only when the surface is

The cells are illuminated by the luminous flux, i.e. when the optical axis between one of the n measuring pairs of the emitting-receiving fiber is in the same liquid or gaseous medium.

Claims of the Invention A discrete optical level gauge comprising a light source optically coupled to a radiating light guide bundle,

an optical fiber harness associated with the measuring circuit, the optical fiber harness attached to the support element in the vessel with a liquid, and the optical fibers in them are optically coupled to each other, which is to expand the field of application and increase noise immunity, A sedative tube is used as a support element, located in the center of the vessel with liquid perpendicular to its surface, and the end ends of the fibers of the emitting and receiving light guides are arranged in pairs on the same optical axis at an angle to liquid surfaces and placed at opposite ends of the still-pipe, and the measuring circuit contains an n-discharge device with charge coupling, a generator of pulses and n elements I, each fiber of the receiving light

the harness is optically connected to the surface of one elementary quantum of the device with charge coupling, the output of the pulse generator is connected in parallel to the outputs of each of the cells of the device with charge

By the connection and the first input of the AND circuits, the outputs of the elementary quanta of the device with charge coupling are connected to the second inputs of the AND circuits, and the outputs of the AND circuits are the outputs of the device.

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Claims (1)

Claim A discrete optical level gauge containing a light source optically coupled to a radiating optical fiber bundle, a receiving optical fiber bundle connected to a measuring circuit, the optical fiber bundles being mounted on a support element in a vessel with a liquid, and the optical fibers in them are optically paired, characterized in that, with In order to expand the scope and increase noise immunity, a soothing pipe is used as a supporting element, located in the center of the vessel with the liquid perpendicular to its surface, and the ends e emitting ends of fiber and receiving light guides arranged in pairs on the same optical axis at an angle to the liquid surface and placed on opposite ends of the stilling well. and the measuring circuit contains an η-discharge device with a charge coupling, a pulse generator and η elements And, and each fiber of the receiving light bundle is optically connected to the surface of one elementary quantum of the device with a charge connection, the output of the pulse generator is connected in parallel to the outputs of each of the η cells of the device with charge communication and the first input of the circuits I. the outputs of the elementary quanta of the device with a charge connection are connected to the second inputs of the circuits And, and the outputs of the circuits And are the outputs of the device. 167'222 7 ”1Ppp · -” ”-” 1 .. .. _e 1 L 1-1L41J1.I-- , ...........] Π Π П | - | I — 1 5-, - ,. ₄ ”in __ί In » _p Μ ΠΠΠΠΠΠίΙΓΙίΙίΙΠΠΠ and .. _______ L ........................ 1 ··· l / mm. ' 1 :::::::::::::::: 1 :: ..... ::: ------- Ι- "