SU678724A1 - Method of graduating infrasonic hydrophones - Google Patents
Method of graduating infrasonic hydrophonesInfo
- Publication number
- SU678724A1 SU678724A1 SU772519832A SU2519832A SU678724A1 SU 678724 A1 SU678724 A1 SU 678724A1 SU 772519832 A SU772519832 A SU 772519832A SU 2519832 A SU2519832 A SU 2519832A SU 678724 A1 SU678724 A1 SU 678724A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- hydrophone
- magnetic field
- hydrophones
- amplitude
- liquid
- Prior art date
Links
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
пение в магнитной жидкости, вследствие пондеромоторногр взаимодействи с магнитным полем, линейно по вертикали увеличиваетс / так что выполн етс соотнсшениеsinging in a magnetic fluid, due to the ponderomotive interaction with the magnetic field, increases linearly in the vertical / so that the correlation is fulfilled
vp-avH-consi, ,/ ,vp-avH-consi,, /,
vP - дополнительный градиент давгде лени в жидкости; С - намагниченность жидкости; /VH/- градиент напр женностиvP is the additional gradient of the pressure in the liquid; C is the magnetization of a liquid; / VH / - gradient of intensity
магнитного пол .юmagnetic field
Поскольку давление линейно измен етс по вертикали, то М (чувствительность ) fpg - ajvHi ) и гдерд - амплитуда давлени в присут ствии магнитного пол . . Тогда погрешность в измерении чу ствительности с М будет определ тьс из известной формулы где Рд - амплитуда давлени в отсутствии магнитного пол , причем можно считать, что погрешность в измерении -давлени где PJ и P - паразитные дина мические давлени , вызванные турбулентностью и инерционными эффектами Из формулы (3) видно, что, снизить погрешность в измерении чувствительности можно, либо уменьшив сГРд либо увеличив Рд. Снизить можно, уменьшив амплитуду колебаний (поскольку тогда уменьшатс скорость цих и ускорение гидрофона X , а следовательно, уменьшатс и паразитные давлени Р и Р , и одновременн чтобы не.уменьшилось Р. - увеличим VP. Так дл того, чтобы практически устранить погрешность, вызванную паразитным динамическим давлением, достаточно уменьшить амплитуду колебаний гидрофона в 3-5 раз (в интервале частот 0,3-4 Гц) и одновременно (чтобы не уменьшилось Рд) в жидкости с намагниченностью 100 ГауеSince the pressure varies linearly vertically, then M (sensitivity) fpg is ajvHi) and gdd is the pressure amplitude in the presence of a magnetic field. . Then the error in measuring the sensitivity with M will be determined from the well-known formula where RD is the pressure amplitude in the absence of a magnetic field, and we can assume that the error in the measurement is pressure where PJ and P are parasitic dynamic pressures caused by turbulence and inertial effects Formula (3) shows that, to reduce the error in measuring the sensitivity can be either reducing the FRS or increasing RD. It is possible to reduce by decreasing the amplitude of oscillations (since then the speed cx and acceleration of the hydrophone X decreases, and consequently, the parasitic pressures P and P will decrease, and at the same time not to decrease P.) we will increase VP. So in order to practically eliminate the error caused parasitic dynamic pressure, it is enough to reduce the amplitude of oscillations of the hydrophone by 3-5 times (in the frequency range 0.3-4 Hz) and at the same time (so that Rd does not decrease) in a fluid with a magnetization 100 Haua
создать папе с градиентом напр женности 30-50 Эрстед/см, что довольно легко осуществимо.create a dad with a gradient of 30-50 Oersted / cm, which is quite easy to implement.
В качестве жидкости можно использовать воду, керосин, силиконовое масло и другую жидкость, в которую ввод тс магнитна присадка и стабилизатор .As a liquid, water, kerosene, silicone oil and other liquid can be used, in which a magnetic additive and a stabilizer are added.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772519832A SU678724A1 (en) | 1977-08-31 | 1977-08-31 | Method of graduating infrasonic hydrophones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772519832A SU678724A1 (en) | 1977-08-31 | 1977-08-31 | Method of graduating infrasonic hydrophones |
Publications (1)
Publication Number | Publication Date |
---|---|
SU678724A1 true SU678724A1 (en) | 1979-08-05 |
Family
ID=20723082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU772519832A SU678724A1 (en) | 1977-08-31 | 1977-08-31 | Method of graduating infrasonic hydrophones |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU678724A1 (en) |
-
1977
- 1977-08-31 SU SU772519832A patent/SU678724A1/en active
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