The present disclosure is generally related to acoustic signals and more particularly is related to multi-path acoustic signal improvements for material detection.
Many materials that are transported through pipes have significant acoustic impedance difference with material that the pipe sidewall is formed from. For example, fluids, liquids, and other viscous materials have a significant acoustic impedance difference relative to pipes or pipelines formed from metals, such as cast iron, steel, aluminum, or the like. Similarly, materials stored in containers, especially metal containers such as oil and gas storage tanks, have characteristically big differences with the material that the container wall is formed from.
With regards to the oil and gas industry specifically, steel is the material often used for pipelines. A steel pipe carrying crude oil has an acoustic impedance barrier which reflects approximately 88% of the energy of the acoustic wave back into the pipe wall depending on the temperature. Only approximately 12% from the energy of the incident wave is transmitted into the crude oil itself. In a similar example, when a cast iron pipe is used to transport water, the amount of the reflected energy is approximately 98.30311% from the incidence wave energy. Due to this reflection of the acoustic wave energy, pipelines and containers with larger sizes often present a challenge for nondestructive analysis since most of the initial signal is lost just crossing the sidewall of the pipe or container containing the fluid.
Thus, a heretofore unaddressed need exists in the industry to address the aforementioned deficiencies and inadequacies.
Embodiments of the present disclosure provide a multi-path acoustic signal system, apparatus, and related methods for use in material detection. Briefly described, in architecture, one embodiment of the apparatus, among others, can be implemented as follows. The apparatus has a plurality of acoustic sensors (or transceivers) positioned along a first portion of a fluid container. At least one acoustic signal is transmitted into the fluid container by each of the plurality of acoustic sensors. At least one additional acoustic sensor is positioned along a second portion of the fluid container, wherein the second portion is substantially opposite the first portion. The at least one additional acoustic sensor receives at least a portion of the acoustic signals from the plurality of acoustic sensors. A reflected acoustic signal is generated from an impedance barrier between the fluid container and a fluid therein. A characteristic of a material of the fluid container and/or the fluid therein are determined.
The present disclosure can also be viewed as providing methods of detecting a material within a fluid container. In this regard, one embodiment of such a method, among others, can be broadly summarized by the following steps: transmitting at least one acoustic signal from each of a plurality of acoustic sensors positioned along a first portion of the fluid container; receiving, with at least one additional acoustic sensor positioned along a second portion of the fluid container, the at least one transmitted acoustic signal, wherein the second portion is substantially opposite the first portion of the fluid container; and determining, based on the at least one received acoustic signal, a composition of the material within the fluid container.
Other systems, methods, features, and advantages of the present disclosure will be or become apparent to one with skill in the art upon examination of the following drawings and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this description, be within the scope of the present disclosure, and be protected by the accompanying claims.
Many aspects of the disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
To improve upon the use of acoustic signals for the detection of materials in fluid-holding pipes, pipelines, containers, or other structures, a multi-path acoustic signal apparatus 10 is provided. In particular, it has been discovered that using a sheer wave through the sidewall of a container holding a material will increase the amount of acoustic energy that is transmitted into the material within the container. In one example, the increase of acoustic energy exceeded 21%. However, the acoustic shear waves are generated with smaller initial energy. Accordingly, to increase the energy of the initial signal, and therefore the effective signal received at a receiving acoustic sensor which is positioned across the container, it is possible to use multiple signals from multiple acoustic sensors that are directed towards the same location on the other side of the container.
At least one acoustic signal 50 is transmitted by each of the acoustic sensors 20 into the fluid container 40, and into a material 12 within the container 40. To aid in clarity of disclosure, the apparatus 10 is described herein relative to a container 40 that is a pipe or pipeline which carries a fluid oil or gas product, but the apparatus 10 can be used in other fields with other containers, such as those holding or transporting water, chemicals, or other materials. The acoustic signal 50 that is transmitted travels through the sidewall 46 of the container 40, through the interior of the container 40 and through any material 12 therein, and through the sidewall 46 of the container 40 on a substantially opposite side of the container 40 from the locations of the acoustic sensors 20. When the signal 50 passes through the sidewall 46 for the second time, it is received within at least one additional acoustic sensor 30, which is positioned along a second portion 44 of the fluid container 40.
As shown in
In one example, at least one acoustic sensor 20 may be directly opposite the at least one additional acoustic sensor 30. In other words, at least one acoustic sensor 20 may be positioned directly opposite the additional acoustic sensor 30 relative to the fluid container 40. An acoustic signal 50 transmitted from the acoustic sensor 20 may propagate through an entire diameter or internal length of the fluid container 40, depending on the geometry. The acoustic signal 50 may propagate through a center or central area of the interior of the fluid container 40. Other acoustics sensors 20 may be positioned so that the acoustic signals 50 transmitted from those sensors 20 may have traveled shorter distances than the entire diameter or internal length of the fluid container 40 to reach the additional acoustic sensor 30.
In one example, the plurality of acoustic sensors 20 and the at least one additional acoustic sensor 30 may be positioned so that the transmitted acoustic signals 50 travel through a distance of at least half of a diameter of the fluid container 12. For instance, one acoustic sensor 20 may be positioned at an angle of 0° relative to the additional acoustic sensor 30. Subsequent acoustic sensors 20 may be positioned at larger angles relative to the additional acoustic sensor 30, but not closer than half the circumference or interior length of the fluid container 12.
At least one additional acoustic sensor 30 receives at least a portion of the acoustic signals 50 from the acoustic sensors 20 transmitting the signals 50. Due to the impedance barrier between the materials of the container 40 and the material 12 therein, a reflected acoustic signal is generated. This reflected acoustic signal may be received at the acoustic sensors 20 or it may dissipate, thereby leaving the portion of the original acoustic signal 50. From the acoustic signal 50 received at the acoustic sensor 30, and/or the reflected signals, and commonly a combination thereof, it is possible to analyze the signals to identify a characteristic of the material forming a sidewall 46 of the fluid container 40 and/or the fluid 12 or other material within the container 40.
The movable acoustic sensor 30 which receives the signal 50 can be moved in a variety of directions and positions. For example, it can be moved along a plane tangential to the cylindrical shape and sidewall of the container 40. For containers 40 which have other shapes, such as cuboid, the acoustic sensor 30 may only need to be moved in a planar direction on one side of the container 40. This movement of the acoustic sensor 40 can catch signals 50 that reflect geometrically outside of the baseline acoustic sensor 30 location, e.g., as depicted in
In one example, moving the acoustic sensor 30 may allow for the measurement and tracking of fluid material density changes or temperature changes, or any other material property changes within the volume of the material.
It may be possible to use a laser interferometer design in operation with the movable acoustic sensor 30, which may include an acoustic peak detector, similar to that used in radio signal transmission, where electromagnetic wave receivers change frequencies to find signals peak due to fading, which may be due to the fact that the carrier frequency may be modified but the frequency encoding is the same.
It is noted that the number of acoustic sensors 20 on the signal 50 transmission side can be determined from various factors, including the condition of the fluid material 12 inside the container 40, a movement or flow of the material 12 within the container, and/or a need for increased signal strength. It is also noted that the acoustic sensors 20 which transmit the signal 50 may be capable of moving position and/or rotating, as indicated by arrows 22, 24 in
The type of acoustic signal 50 transmitted from the acoustic sensors 20 through the sidewall 46 of the container 40 may include shear waves and/or longitudinal waves, since the incidence angles can be set to match the conditions of the apparatus 10, the container 40, and/or the material 12 therein. The frequency of the acoustic signal 50 may be any suitable acoustic frequency or combination of frequencies within the acoustic spectrum, including subsonic, sonic, and ultrasonic frequencies. The frequencies used may be determined based on the composition of the fluid container 40, the expected fluid material 12, or a combination thereof.
The acoustic sensors 30 sensing the material composition of the sidewall 46 of the container 40 may receive the first echo 52 when processing the signal from the acoustic sensors 20 transmitting the signal 50, as shown in
Turning to
With respect to the apparatus 10 in
Furthermore, the wave absorption may be measured at different frequencies. Different frequencies can be used in certain cases, where the material acoustic attenuation allows for receiving of different signals 50 with each individual signal 50 using a separate frequency or range of frequencies. In this way, the signals 50 may not need to be synchronized and it may be possible to measure multiple points of the absorption vs. frequency curve at the same time periodically.
Additionally, it is noted that time of flight measurements may be taken, and additional processing may be used since each path of the signal 50 may have a different time of flight. In the case when each signal path is using different frequencies, the time of flight may be measured separately.
In operation, the apparatus 10 may be calibrated during assembly or before use. In one example, calibration may include mounting an acoustic sensor 20 to the exterior of the fluid container 40 along the first portion 42. The at least one additional acoustic sensor 30 may be mounted along the second portion 44. The additional acoustic sensor 30 may be moved about the fluid container 40 until a maximum signal point is found, which may be used to determine a first path of the signal between the acoustic sensors 20, 30. More acoustic sensors 20 may be mounted to the outside of the fluid container 40 at different locations along the first portion 42. The acoustic sensors 20 may be moved until a maximum signal point between the sensors 20 and the additional acoustic sensor 30 is found. This may allow the apparatus 10 to better operate within larger fluid containers 40.
Data from the acoustic sensors 20, 30 may be communicated to the computer processor 80 along the at least one network 70. Communicated data may include data from the plurality of acoustic sensors 20 positioned along the first portion 42 of the fluid container 40, such as characteristic information about any acoustic signals transmitted, and received data from any reflected acoustic signals received by the acoustic sensors 20. Communicated data may further include data from the at least one additional acoustic sensor 30 positioned along the second portion 44 of the fluid container 40, such as received data from the transmitted acoustic signals 50 received by the additional acoustic sensor 30. The communicated data may be analyzed to determine composition and other material characteristics of the material 12 within the fluid container 40.
Step 510 includes transmitting at least one acoustic signal from each of a plurality of acoustic sensors positioned along a first portion of the fluid container. In one example, at least one of the transmitted acoustic signals may differ from another transmitted acoustic signal in one or more ways. For instance, at least one transmitted acoustic signal may have a frequency different from another. At least one transmitted acoustic signal may have a pulse length or transmission length different from another. For example, one signal may include a shorter pulse, while another may include a long pulse. In one example, one transmitted acoustic signal may be continuous, while another is not. At least one transmitted acoustic signal may have a periodic or patterned transmission. In another example, one or more transmitted acoustic signals may have the same frequency, pulse length, or periodic or patterned transmission.
In one example, at least one of the transmitted acoustic signals may propagate through the fluid container in a direction different from another acoustic signal. For instance, the plurality of acoustic sensors may be positioned at different angular locations on the fluid container, but may each be oriented toward the same point. Put another way, all of the acoustic sensors may be located at different positions within a plane extending through the fluid container.
In one example, a phase of the transmitted acoustic signals may be synchronized between the signals such that periodic maxima and minima in the amplitude of the signals occur at the same time. This may allow the transmitted signals to be constructively or destructively interfered with one another.
Step 520 includes receiving, with at least one additional acoustic sensor positioned along a second portion of the fluid container, the at least one transmitted acoustic signal, wherein the second portion is substantially opposite the first portion of the fluid container. In one example, at least one of the transmitted acoustic signals may travel through the entire diameter of the fluid container. In another example, at least one of the transmitted acoustic signals may travel through less than the entire diameter of the fluid container.
Step 530 includes determining, based on the at least one received acoustic signal, a composition of the material within the fluid container.
Step 540 includes receiving, with at least one of the plurality of acoustic sensors positioned along the first portion of the fluid container, at least one reflected acoustic signal generated from an impedance barrier between the fluid container and the material.
Step 550 includes determining, based on the at least one received acoustic signal and the at least one reflected acoustic signal, a composition of the material within the fluid container. In one example, a temperature sensor may be used to determine a temperature of the material, the fluid container, or both. The determined temperature or temperatures may be used to determine the composition or other characteristics of the material within the fluid container.
It should be emphasized that the above-described embodiments of the present disclosure, particularly, any “preferred” embodiments, are merely possible examples of implementations, merely set forth for a clear understanding of the principles of the disclosure. Many variations and modifications may be made to the above-described embodiment(s) of the disclosure without departing substantially from the spirit and principles of the disclosure. All such modifications and variations are intended to be included herein within the scope of this disclosure and the present disclosure and protected by the following claim.
This application claims benefit of U.S. Provisional Application Ser. No. 63/121,727 filed Dec. 4, 2020 and titled “Multi-Path Acoustic Signal Improvement for Material Detection”, the entire disclosure of which is incorporated herein by reference.
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Number | Date | Country | |
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20220178731 A1 | Jun 2022 | US |
Number | Date | Country | |
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63121727 | Dec 2020 | US |