CN216887157U - Fixing device of underwater topography survey single-beam depth finder - Google Patents
Fixing device of underwater topography survey single-beam depth finder Download PDFInfo
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- CN216887157U CN216887157U CN202220613981.7U CN202220613981U CN216887157U CN 216887157 U CN216887157 U CN 216887157U CN 202220613981 U CN202220613981 U CN 202220613981U CN 216887157 U CN216887157 U CN 216887157U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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Abstract
The utility model relates to a fixing device of a single-beam depth finder for underwater topographic survey, which comprises a single-beam depth finder connecting rod stabilizer and a single-beam depth finder connecting rod fixer, wherein the single-beam depth finder is connected with the single-beam depth finder through a connecting rod; the fixer is arranged in the middle of the single-beam depth finder, the connecting rod is fixed on a ship board, the stabilizer is arranged on the upper portion of the single-beam depth finder, central axes of the transducer, the connecting rod and the GPS locator are kept to be a vertical straight line, and accuracy of a measuring result is guaranteed. The utility model only needs to be arranged on the side of the ship, does not need to connect any article on the ship body, and does not cause any damage to the ship body.
Description
Technical Field
The utility model relates to the field of underwater topography measurement, in particular to a fixing device of an underwater topography measurement single-beam depth finder.
Background
At present, the underwater topography measurement mainly adopts a depth finder to perform echo positioning measurement, wherein the single-beam depth finder has the advantages of low price, simple structure, light weight and the like, and is widely used in water areas such as river channels, lakes, reservoirs and the like.
The single beam depth finder mainly comprises the transducer, the connecting rod, the GPS locater, the computer etc. and is the single-rod structure usually, wherein, the single beam depth finder stands on the ship side, the GPS locater is connected on the connecting rod top of single beam depth finder, the transducer is connected to the connecting rod bottom, need be fixed in on the boats and ships when carrying out underwater topography survey with the single beam depth finder, because the transducer is sharp transmission sound wave signal, for accurate measurement submarine degree of depth, need keep the transducer, the connecting rod, the GPS locater is a vertical straight line, the submarine topography degree of accuracy of measuring like this is higher. At present, a rope is often adopted for fixing the single-beam depth finder, holes or nails are required to be formed in a ship body, certain damage is caused to the ship body, and due to the difference of binding methods, the firmness of the depth finder can be influenced, so that the measuring result of the depth finder is influenced.
The utility model with publication number CN210294518U discloses a fixing device on a ship for a transducer rod of a single beam depth finder, although the connection is more stable and firm compared with the traditional binding mode, the fixing device needs to be connected with a vertical rod-shaped object on the ship when in use, thereby limiting the application range; in addition, the device has an essential component as a supporting seat, and the supporting seat is required to be tightly fixed with the ship body for use, so that the supporting seat is not easy to disassemble, and the application range of the device is also limited.
Disclosure of Invention
The utility model provides a fixing device of an underwater topography measurement single-beam depth finder, which can keep the central axes of an energy transducer, a connecting rod and a GPS (global positioning system) locator as a vertical straight line and ensure the accuracy of a measurement result; and when in use, the device does not need to be connected with any article on the ship body, and does not cause any damage to the ship body, and meanwhile, the device is easy to disassemble and has high universality.
The scheme for solving the technical problems is as follows: a fixing device of a single-beam depth finder for underwater topographic survey comprises a single-beam depth finder connecting rod stabilizer and a single-beam depth finder connecting rod fixer;
the stabilizer comprises a stabilizer buckle, a first support rod, a second support rod, a first support and a second support, wherein the stabilizer buckle is used for being clamped on the connecting rod of the single-beam depth finder, one side of the stabilizer buckle is hinged with one end of the first support rod, the other end of the first support rod is hinged with the first support, the other side of the stabilizer buckle is hinged with one end of the second support rod, the other end of the second support rod is hinged with the second support, and the first support and the second support are used for being installed on a ship board;
the single-beam depth finder connecting rod fixer comprises an upper buckle and a third support, the third support is used for being installed on a ship board, the upper buckle is fixed on the third support, and the upper buckle is used for clamping the single-beam depth finder connecting rod.
The main component of stabilizer buckle can be by 2 relative and first semicircle parts of establishing constitute, and 2 first semicircle parts's an offside department is connected through bolt and nut, and another offside department is connected through first locking buckle. When the locking buckle is in a locking state, the stabilizer buckle can be clamped on the connecting rod of the single-beam depth finder, and when the locking buckle is in a non-locking state, the stabilizer buckle can be detached from the connecting rod of the single-beam depth finder.
The main component of going up the buckle can be become by 2 relative second semicircle parts that establish, and 2 second semicircle parts's an offside department is connected through bolt and nut, and another offside department is connected through second locking buckle. When the locking buckle is in a locking state, the upper buckle can be clamped on the connecting rod of the single-beam depth finder, and when the locking buckle is in a non-locking state, the upper buckle can be detached from the connecting rod of the single-beam depth finder.
It is worth mentioning that the cross sections of the components of the first support, the second support and the third support are all in an arch shape or a rectangular shape and can be made of round steel or square steel.
Preferably, the single beam depth finder connecting rod fixer further comprises a lower buckle, the lower buckle is fixed on the third support, the lower buckle is used for clamping the single beam depth finder connecting rod, and the upper buckle is located right above the lower buckle. The lower buckle is used for assisting the upper buckle to fix the connecting rod of the single-beam depth finder, and two supporting points are provided when the single-beam depth finder is installed on the fixer, so that the single-beam depth finder is in a relatively stable state and cannot shake violently.
The main component of lower buckle can be by 2 relative and third semicircle parts of setting constitute, and one offside of 2 third semicircle parts is connected through bolt and nut, and another offside is connected through third locking buckle. When the locking buckle is in a locking state, the lower buckle can be clamped on the connecting rod of the single-beam depth finder, and when the locking buckle is in a non-locking state, the buckle can be detached from the connecting rod of the single-beam depth finder.
Preferably, the first support is hinged to the first support rod through a hinge shaft, a gasket is arranged on the hinge shaft, and the gasket is located between the first support rod and the first support.
Preferably, the second support is hinged to the second support rod through a hinge shaft, and a gasket is arranged on the hinge shaft and located between the second support rod and the second support.
The gasket can be made of rubber, a completely broken notch is formed in the lower portion of the gasket, a small gap notch is formed in the upper portion of the gasket, the completely broken notch in the lower portion can be broken off, the gasket is sleeved on the hinge shaft, and therefore the left position and the right position of the hinge shaft relative to the first support rod and the second support rod are adjusted. When the ship body is in an arc shape instead of a straight line shape, in order to ensure that the two support rods and the connecting rod are in a vertical plane, the left or right gaskets of the first support rod and the second support rod can be increased or decreased to keep the three in a vertical plane, so that the effect of stable support is achieved.
Preferably, first support, second support all include first horizontal pole and 2 first vertical poles, the top and the first horizontal pole fixed connection of 2 first vertical poles, the ship board is located between 2 first vertical poles, 2 first vertical poles pass through fastening bolt and fix on the ship board, articulated corresponding bracing piece on the first horizontal pole.
Preferably, the third support comprises a second horizontal rod and 2 second vertical rods, the top ends of the 2 second vertical rods are fixedly connected with the second horizontal rod, the ship board is located between the 2 second vertical rods, the 2 second vertical rods are fixed on the ship board through fastening bolts, the second horizontal rod is fixedly connected with the upper buckle, and the second vertical rod on the outer side is fixedly connected with the lower buckle.
Preferably, a first leveling pipe is arranged on the stabilizer buckle.
Preferably, a second leveling pipe is arranged on the upper buckle.
The first leveling pipe installation direction is parallel to the supporting rods and used for detecting whether the connecting rod inclines in the horizontal direction, and the second leveling pipe installation direction is parallel to the second leveling pipe and used for detecting whether the connecting rod inclines in the vertical direction. And long leveling air bubbles and staff scales are arranged in each leveling pipe. When the air bubbles in the leveling pipes are centered, the connecting rod stabilizer of the single-beam depth finder and the connecting rod fixer of the single-beam depth finder are horizontally arranged in the left-right front-back direction, and if the air bubbles are not centered, adjustment is needed.
Preferably, the inner sides of the stabilizer buckle, the upper buckle and the lower buckle are respectively provided with a gasket. The packing ring can be a rubber packing ring for the laminating degree when increasing with the connecting rod increases the frictional force between buckle and connecting rod simultaneously, guarantees that the connecting rod can not slide downwards.
The utility model has the following beneficial effects:
1. the main parts of the utility model have the advantages of detachability, convenient carrying, simple installation and the like, and simultaneously do not need to depend on other objects on the ship body for use, thereby avoiding the traditional binding mode that holes are formed on the ship body or nails are nailed, reducing the damage to the ship body and having higher universality and application range;
2. the fixer and the stabilizer can ensure that the central axes of the transducer, the connecting rod and the GPS locator are a vertical straight line, and the device has small vibration and shake when a measuring ship runs at high speed, thereby ensuring the measuring accuracy.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a single beam measurement instrument connection rod fixture installed on a ship board according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a stabilizer buckle according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of an upper buckle according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a lower buckle according to an embodiment of the present disclosure;
FIG. 6 is a schematic view of a first support mounted to a side of a vessel in accordance with an embodiment of the present invention;
FIG. 7 is a schematic illustration of the second mount mounted to the side of a vessel in an embodiment of the utility model;
FIG. 8 is a schematic structural diagram of a gasket according to an embodiment of the utility model.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a GPS locator; 2. a connecting rod; 3. a transducer; 4. an upper buckle; 5. a lower buckle; 6. a stabilizer buckle; 7. a first support bar; 8. a second support bar; 9. a third support; 10. a first support; 11. a second support; 12. a first level tube; 13. a second level tube; 14. a first semi-annular member; 15. a first locking buckle; 16. hinging a shaft; 17. a gasket; 18. a second half-ring member; 19. a third half-ring member; 20. a second locking buckle; 21. a third locking buckle; 22. a first horizontal bar; 23. a first vertical rod; 24. a second horizontal bar; 25. a second vertical rod; 26. a ship side; 100. the single-beam depth finder connecting rod stabilizer; 200. single beam depth finder connecting rod fixer.
Detailed Description
The principles and features of the present invention are described below in conjunction with the accompanying fig. 1-8, which are provided as examples to illustrate the utility model and not to limit the scope of the utility model. The utility model is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings.
As shown in fig. 1, a fixing device for an underwater topography single-beam depth finder comprises a single-beam depth finder connecting rod stabilizer 100 and a single-beam depth finder connecting rod fixer 200;
the stabilizer 100 for the connecting rod of the single beam depth finder comprises a stabilizer buckle 6, a first supporting rod 7, a second supporting rod 8, a first support 10 and a second support 11, wherein the stabilizer buckle 6 is used for being clamped on the connecting rod 2 of the single beam depth finder, one side of the stabilizer buckle 6 is hinged to one end of the first supporting rod 7, the other end of the first supporting rod 7 is hinged to the first support 10, the other side of the stabilizer buckle 6 is hinged to one end of the second supporting rod 8, the other end of the second supporting rod 8 is hinged to the second support 11, the first support 10 and the second support 11 are used for being installed on a ship board 26, the connecting rod 2 of the single beam depth finder is located between the first support 10 and the second support 11, and the distance between the connecting rod 2 of the single beam depth finder and the first support 10 is equal to the distance between the connecting rod 2 of the single beam depth finder and the second support 11;
as shown in fig. 2, the single beam depth finder connecting rod holder 200 includes an upper clip 4 and a third support 9, the third support 9 is used for being mounted on the ship board 26, the upper clip 4 is fixed on the third support 9, and the upper clip 4 is used for clipping the single beam depth finder connecting rod 2.
As shown in fig. 3, the main components of the stabilizer buckle 6 may be composed of 2 opposite first half-ring parts 14, wherein one butt of the 2 first half-ring parts 14 is connected by a bolt and a nut, and the other butt is connected by a first locking buckle 15. When the locking buckle is in a locking state, the stabilizer buckle 6 is clamped on the single-beam depth finder connecting rod 2, and when the locking buckle is in a non-locking state, the stabilizer buckle 6 can be detached from the single-beam depth finder connecting rod 2.
As shown in fig. 4, the main components of the upper buckle 4 may be composed of 2 opposite second half-ring parts 18, one abutting part of the 2 second half-ring parts 18 is connected by a bolt and a nut, and the other abutting part is connected by a second locking buckle 20. When locking buckle is in the locking state, go up buckle 4 and will block tightly on single beam depth finder connecting rod 2, when being in non-locking state, go up buckle 4 and can follow and dismantle on single beam depth finder connecting rod 2.
It should be noted that the cross sections of the first support 10, the second support 11, and the third support 9 are all arched or rectangular, and can be made of round steel or square steel.
Single beam depth finder connecting rod fixer 200 still includes buckle 5 down, and lower buckle 5 is fixed on third support 9, and lower buckle 5 is used for joint single beam depth finder connecting rod 2, goes up buckle 4 and is located buckle 5 directly over down. Lower buckle 5 is supplementary to be gone up buckle 4 and is fixed single beam depth finder connecting rod 2, provides two fulcrums when installing single beam depth finder to the fixer on, makes single beam depth finder be in relatively stable state, can not violently rock.
As shown in fig. 5, the main components of the lower buckle 5 may be composed of 2 opposite third half-ring parts 19, one abutting part of the 2 third half-ring parts 19 is connected by a bolt and a nut, and the other abutting part is connected by a third locking buckle 21. When locking buckle is in the locking state, lower buckle 5 will the chucking on single beam depth finder connecting rod 2, when being in non-locking state, the buckle can be followed and is dismantled on single beam depth finder connecting rod 2.
As shown in fig. 6, the first support 10 is hinged to the first support rod 7 through a hinge shaft 16, a gasket 17 is disposed on the hinge shaft 16, and the gasket 17 is located between the first support rod 7 and the first support 10.
As shown in fig. 7, the second support 11 is hinged to the second support bar 8 through a hinge shaft 16, and a gasket 17 is disposed on the hinge shaft 16, and the gasket 17 is located between the second support bar 8 and the second support 11.
The gasket 17 may be made of rubber, and as shown in fig. 8, the gasket 17 has a completely broken notch below the gasket 17 and a small gap notch above the gasket, so that the completely broken notch below the gasket 17 can be broken off and the gasket 17 is fitted on the hinge shaft 16, thereby adjusting the left and right positions of the first support rod 7 and the second support rod 8 relative to the hinge shaft 16. When the hull is arc non-linear shape, in order to guarantee two bracing pieces and connecting rod 2 in a vertical plane, the accessible is at first bracing piece 7, the left or right increase and decrease gasket 17 of second bracing piece 8, keeps the three in a vertical plane, reaches the effect of stable support.
The first support 10 and the second support 11 each comprise a first horizontal rod 22 and 2 first vertical rods 23, the top ends of the 2 first vertical rods 23 are fixedly connected with the first horizontal rod 22, the ship board 26 is located between the 2 first vertical rods 23, the 2 first vertical rods 23 are fixed on the ship board 26 through fastening bolts, and the corresponding support rods are hinged on the first horizontal rod 22.
The third support 9 comprises a second horizontal rod 24 and 2 second vertical rods 25, the top ends of the 2 second vertical rods 25 are fixedly connected with the second horizontal rod 24, the ship board 26 is positioned between the 2 second vertical rods 25, the 2 second vertical rods 25 are fixed on the ship board 26 through fastening bolts, the upper buckle 4 is fixedly connected on the second horizontal rod 24, and the lower buckle 5 is fixedly connected with the outer second vertical rods 25.
The stabilizer buckle 6 is provided with a first leveling tube 12.
The upper buckle 4 is provided with a second leveling tube 13.
The first level pipe 12 is installed in a direction parallel to the support rods for detecting whether the connecting rod 2 is inclined in the horizontal direction, and the second level pipe 13 is installed in a direction parallel to the second level rod 24 for detecting whether the connecting rod 2 is inclined in the vertical direction. Each level pipe is internally provided with a long level bubble and a staff gauge. When the bubble in each leveling tube is centered, it indicates that the single-beam depth finder connecting rod stabilizer 100 and the single-beam depth finder connecting rod fixer 200 are horizontal in the left-right front-back direction, and if the bubble is not centered, adjustment is required.
The stabilizer buckle 6, the upper buckle 4 and the lower buckle 5 are all provided with gaskets on the inner sides. The packing ring can be the rubber packing ring for the laminating degree when increasing connecting rod 2 increases each buckle and connecting rod 2's frictional force simultaneously, guarantees that connecting rod 2 can not the lapse.
The working principle and the using method of the utility model are as follows: firstly, installing a single-beam depth finder connecting rod fixer 200, clamping a third support 9 into a ship board 26, primarily fastening by an adjusting bolt, checking a second leveling tube 13, judging the inclination direction, adjusting the left and right angles of the third support 9 to center a long leveling bubble, adjusting the adjusting bolt to be completely fastened, simultaneously clamping a connecting rod 2 into an upper buckle 4 and a lower buckle 5, and locking the upper buckle 4 and the lower buckle 5; then install single beam depth finder connecting rod stabilizer 100, at the symmetrical position of the relative connecting rod 2 of ship board 26, install first support 10 and second support 11 tentatively, put into stabilizer buckle 6 chucking with connecting rod 2, through the quantity of increase and decrease gasket 17, let first bracing piece 7, second bracing piece 8 and connecting rod 2 are in a vertical plane, observe first water level pipe 12 on the stabilizer buckle 6, finely tune connecting rod 2 and first bracing piece 7 around, the angle of second bracing piece 8, let long water level bubble be placed in the middle, further adjust first support 10 again, bolt complete fastening on the second support 11. After the steps are completed, the central axes of the transducer 3, the connecting rod 2 and the GPS locator 1 of the single-beam depth finder can be ensured to be a vertical straight line.
The foregoing is merely a preferred embodiment of the utility model and is not intended to limit the utility model in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the utility model as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. A fixing device of a single-beam depth finder for underwater topographic survey is characterized by comprising a single-beam depth finder connecting rod stabilizer (100) and a single-beam depth finder connecting rod fixer (200);
the stabilizer (100) of the connecting rod of the single beam depth finder comprises a stabilizer buckle (6), a first supporting rod (7), a second supporting rod (8), a first support (10) and a second support (11), wherein the stabilizer buckle (6) is used for being clamped on the connecting rod of the single beam depth finder (2), one side of the stabilizer buckle (6) is hinged with one end of the first supporting rod (7), the other end of the first supporting rod (7) is hinged with the first support (10), the other side of the stabilizer buckle (6) is hinged with one end of the second supporting rod (8), the other end of the second supporting rod (8) is hinged with the second support (11), and the first support (10) and the second support (11) are used for being installed on a ship board;
single beam depth finder connecting rod fixer (200) are including last buckle (4) and third support (9), third support (9) are used for installing on the ship board, go up buckle (4) and fix on third support (9), go up buckle (4) and be used for joint single beam depth finder connecting rod (2).
2. The fixing device for the underwater topography single-beam depth finder comprises a lower buckle (5), wherein the lower buckle (5) is fixed on a third support (9), the lower buckle (5) is used for clamping the single-beam depth finder connecting rod (2), and the upper buckle (4) is positioned right above the lower buckle (5).
3. The fixing device of the underwater topography single-beam depth finder is characterized in that the first support (10) is hinged to the first support rod (7) through a hinge shaft (16), a gasket (17) is arranged on the hinge shaft (16), and the gasket (17) is located between the first support rod (7) and the first support (10).
4. The fixing device of the underwater topography single-beam depth finder according to claim 1, wherein the second support (11) is hinged to the second support rod (8) through a hinge shaft (16), a gasket (17) is arranged on the hinge shaft (16), and the gasket (17) is located between the second support rod (8) and the second support (11).
5. The fixing device of the underwater topography single-beam depth finder is characterized in that the first support (10) and the second support (11) each comprise a first horizontal rod (22) and 2 first vertical rods (23), the top ends of the 2 first vertical rods (23) are fixedly connected with the first horizontal rods (22), the ship board is located between the 2 first vertical rods (23), the 2 first vertical rods (23) are fixed on the ship board through fastening bolts, and the corresponding support rods are hinged on the first horizontal rods (22).
6. The fixing device of the underwater topography single-beam depth finder of claim 2, wherein the third support (9) comprises second horizontal rods (24) and 2 second vertical rods (25), the top ends of the 2 second vertical rods (25) are fixedly connected with the second horizontal rods (24), the ship board is located between the 2 second vertical rods (25), the 2 second vertical rods (25) are fixed on the ship board through fastening bolts, the upper buckle (4) is fixedly connected on the second horizontal rods (24), and the outer second vertical rods (25) are fixedly connected with the lower buckle (5).
7. The fixing device of the underwater topography single-beam depth finder according to claim 1, wherein a first leveling tube (12) is provided on the stabilizer buckle (6).
8. The fixing device of the underwater topography single-beam depth finder according to claim 1, wherein a second leveling tube (13) is arranged on the upper buckle (4).
9. The fixing device of the underwater topography single-beam depth finder is characterized in that gaskets are arranged on the inner sides of the stabilizer fastener (6), the upper fastener (4) and the lower fastener (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220613981.7U CN216887157U (en) | 2022-03-21 | 2022-03-21 | Fixing device of underwater topography survey single-beam depth finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220613981.7U CN216887157U (en) | 2022-03-21 | 2022-03-21 | Fixing device of underwater topography survey single-beam depth finder |
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| CN216887157U true CN216887157U (en) | 2022-07-05 |
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| CN202220613981.7U Active CN216887157U (en) | 2022-03-21 | 2022-03-21 | Fixing device of underwater topography survey single-beam depth finder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116592853A (en) * | 2023-05-26 | 2023-08-15 | 江苏瀚蓝信息科技有限公司 | Depth detector for underwater topography measurement |
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2022
- 2022-03-21 CN CN202220613981.7U patent/CN216887157U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116592853A (en) * | 2023-05-26 | 2023-08-15 | 江苏瀚蓝信息科技有限公司 | Depth detector for underwater topography measurement |
| CN116592853B (en) * | 2023-05-26 | 2023-10-13 | 江苏瀚蓝信息科技有限公司 | Depth detector for underwater topography measurement |
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