Measuring and testing – Liquid level or depth gauge
Patent
1983-01-21
1985-08-20
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
340621, 367908, G01F 2328, G01N 2902
Patent
active
045356289
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for level measurements of acoustic transmission characteristics of at least one medium to be measured, e.g. for measuring levels of said medium, as stated in the introductory part of the following claims.
From the Norwegian Pat. No. 141 967 an apparatus for level measurements of freely flowing substances, solids or combinations of these in tanks, containers, basins or the like by measuring the acoustic transmission characteristics is known, wherein two separate elongated tubes are arranged, both being closed at their bottom ends, and both tubes being filled with a suitable liquid forming a means of communication between an emitter transducer and a collector transducer which are adjustably provided in their respective tubes. The tubes primarily serve to separate the transducers from the medium to be measured. The transducers are separately connected to a conveyer means for position control and they comprise electrical connections to a signal processing device.
As will appear from said patent the transducers will necessarily have a non-directional radiation pattern, which causes increased power demand, a poor signal
oise ratio and reduced resolution. The shown solution among others have the constructive disadvantages that synchronous moving of the separate transducers necessitates complicated and relatively expensive equipment and that the general construction of the apparatus in other respects is mechanically complicated and vulnerable.
German Pat. No. 1 648 997 shows a solution, wherein two transducers are secured inside the respective branches of a hollow chamber having a C-shaped cross section. The thickness of the chamber wall is designed to be an integer of .lambda./2, .lambda. corresponding to the wave length of the utilized transducers. Between each transducer and the wall of the C-shaped chamber there is an insert securing the transducer to the profile wall. A disadvantage of said known solution is among others the necessity of precise operational frequencies for both transducers, and that this requires a complicated installation, especially in chambers of great lengths. Furthermore, every measuring point consists of mutually tuned pairs of transducers which only form one fixed measuring point, so that in case several measuring points are needed this will necessitate a corresponding number of transducer pairs as well as an increased amount of electronics. Also, it is impossible to move the transducer.
The present invention, thus, has the object of providing an apparatus that is less expensive and more simple in production, more reliable in operation, has a high resolution as compared with the known art, and enables control measurements of the function of the apparatus.
The features characterizing the invention will appear from the following claims as well as from the following description with reference to the accompanying drawing.
FIG. 1 illustrates the principle of the operation of the apparatus according to the invention.
FIG. 2 shows the apparatus according to the invention provided in a hollow chamber.
FIG. 3 shows the apparatus according to the invention mounted on top of a container or the like.
FIG. 4 illustrates a cross-section taken along the line A--A in FIG. 3.
FIG. 5 illustrates the arrangement of the transducers in the apparatus according to FIG. 3.
FIGS. 6-11 illustrate various kinds of hollow chambers of an apparatus as shown in FIG. 1.
FIG. 12 shows a modification of the apparatus according to the invention, designed for measurement of media to be measured provided in a closed container.
FIG. 13 shows a modification of the level meter according to FIGS. 3-5, especially for use as a high level alarm device, partly shown in section.
FIGS. 14a and 14b illustrate the principle of the embodiment according to FIG. 13.
FIG. 15 is a time diagram for a closer illustration of the operation of the level meter according to FIGS. 13 and 14.
In FIG. 1 a mounting support 1 is shown connected with a combined control and detection means 11. To one free
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