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公开(公告)号：US3858446A
公开(公告)日：1975-01-07
申请号：US34974273
申请日：1973-04-10
申请人： GEN ELECTRIC CANADA
IPC分类号： G01R25/00 , G01F1/66 , G01F1/712 , G01P5/18 , G01P5/22 , G01P5/24 , G01R27/28 , H03D3/02 , H03D3/18 , G01F1/00
摘要： A system such as a flow velocity measuring system relies upon obtaining a signal having a slight phase difference from a carrier signal, due to a change in signal circuit characteristic. The disclosed arrangement provides highly sensitive detection of such slight phase differences, including the provision of signal components in mutual quadrature relation permitting selection and switching as a useful output signal of that component having an instantaneous value and polarity to meet a predetermined condition of positive-going value for a selected sense of phase change, in a leading or in a lagging sense. The system may be selected to be substantially insensitive to changes in carrier frequency, or to be amplitude insensitive.
摘要翻译： 由于信号电路特性的变化，诸如流速测量系统的系统依赖于获得与载波信号具有轻微相位差的信号。 所公开的装置提供对这种微小相位差的高度敏感的检测，包括提供相互正交关系的信号分量，允许选择和切换作为具有瞬时值和极性的该分量的有用输出信号，以满足正向的预定条件 一种选择的相变感的价值，处于领先或滞后的意义上。 可以选择该系统对载波频率的变化基本上不敏感，或者是对幅度不敏感的。
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公开(公告)号：US11921036B2
公开(公告)日：2024-03-05
申请号：US17271732
申请日：2019-09-09
发明人： Vittorio Scipolo , Avishekh Pal
CPC分类号： G01N21/3103 , F27B3/28 , F27D21/00 , G01N33/004 , G01P5/22 , G01N2201/0612
摘要： An optically based combustion off-gas stream velocity sensor assembly is provided for detecting in real-time off-gas flow velocity and/or volume as it moves through a flue duct. The sensor assembly includes two paired coherent light emitters and optic sensors, positioned in a spaced orientation in the flow path direction. The light emitter/optic sensor pairs operate to emit and detect across the off-gas stream coherent light beam energy having a wavelength component corresponding to an absorption profile of an off-gas species component. The detection of non-absorbed portions of the emitted beam is used to identify and detect the movement of a flow species signature at different locations along the flue duct.
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公开(公告)号：US20230384340A1
公开(公告)日：2023-11-30
申请号：US18183337
申请日：2023-03-14
发明人： Naomichi JIMBO , Naoki TAKEDA
IPC分类号： G01P5/22
CPC分类号： G01P5/22
摘要： A fluid measurement system includes a first sensor and a second sensor disposed on a same pipe and spaced apart from each other by a predetermined distance; and a measurement controller configured to calculate a flow velocity of a fluid flowing through the pipe based on first output that is output from the first sensor and second output that is output from the second sensor. The measurement controller performs a process including (a) comparing the first output and the second output in a first period of time so as to repeatedly calculate a first time difference between the first output and the second output while shifting the first period of time, (b) calculating a second time difference based on a frequency of occurrence of a plurality of first time differences each calculated in the first period of time, and (c) calculating the flow velocity based on the second time difference.
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公开(公告)号：US11231436B2
公开(公告)日：2022-01-25
申请号：US16608187
申请日：2018-02-16
发明人： Isamu Nakao , Noriyuki Kishii , Tetsuro Kuwayama , Kensei Jo
摘要： The flow rate of light scattering fluid is measured more easily and at a higher speed.
A flow rate measuring method according to the present disclosure includes: generating two or more speckle images by continually imaging light scattering fluid to be measured, while defining time shorter than spatial correlation disappearance time corresponding to time in which spatial correlation between speckle patterns generated by the light scattering fluid disappears as exposure time, at a time interval shorter than the spatial correlation disappearance time; and calculating direction and speed of flow of the light scattering fluid from time variation of the speckle patterns between the two or more speckle images, in which the speckle images are imaged by using an imaging device mounted with an area sensor and a pixel group of a part of the area sensor or by using an imaging device mounted with a line sensor.-
公开(公告)号：US10444255B2
公开(公告)日：2019-10-15
申请号：US15524670
申请日：2015-11-02
申请人： photrack AG
发明人： Beat Lüthi , Thomas Philippe , Salvador Peña-Haro
IPC分类号： G01P5/22 , G01P5/00 , G01P5/18 , G01F1/00 , G01F1/712 , G01F1/708 , G01C13/00 , G06T7/254 , G06T7/285
摘要： A method for determining the velocity of a moving fluid surface, which comprises the following steps S1 to S5: S1) taking a sequence of images of the moving fluid surface by at least one camera; S2) comparing a first image from the sequence with a second image from the sequence in order to distinguish moving patterns of the fluid surface from non-moving parts and to obtain a first processed image (im_1f) comprising the moving patterns; S3) comparing a third image from the sequence with a fourth image from the sequence in order to distinguish moving patterns of the fluid surface from non-moving parts and to obtain a second processed image (im_2f) comprising the moving patterns; S4) comparing the first and second processed images in order to determine the spatial displacements of the moving patterns; and S5) determining from the spatial displacements the velocity.
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公开(公告)号：US20190094009A1
公开(公告)日：2019-03-28
申请号：US16084450
申请日：2017-02-07
申请人： SONY CORPORATION
发明人： Kota AIZAWA , Atsushi OKUBO , Yoshihiro WAKITA
CPC分类号： G01B9/02094 , A61B5/0033 , A61B5/0059 , A61B5/021 , A61B5/024 , A61B5/0261 , A61B5/14551 , G01B9/02083 , G01P5/22 , G01P5/26 , G06T7/246 , G06T2207/30104
摘要： There is provided a speckle measurement apparatus to improve accuracy of flow velocity measurement or the like of particulates such as erythrocytes, the speckle measurement apparatus including an imager that captures scattered light images returned from an object to be measured when the object to be measured is irradiated with coherent light as speckle images, and a controller that determines a measurement area that is the same site of the object to be measured in a plurality of the speckle images captured continuously in time series by the imager by incorporating a displacement amount of a relative positional relationship between the object to be measured and the imager.
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公开(公告)号：US10186051B2
公开(公告)日：2019-01-22
申请号：US15592249
申请日：2017-05-11
申请人： Dantec Dynamics A/S
发明人： Christoph Brücker , Bo Beltoft Watz , David Hess
IPC分类号： G06K9/00 , G01P5/00 , G06T7/80 , G06T7/20 , G06T15/08 , G01P3/38 , H04N13/128 , H04N13/243 , H04N13/246 , G01P5/20 , G01P5/22 , H04N13/00
摘要： A method for calibrating a velocimetry system, the velocimetry system including at least one camera for imaging an illuminated volume comprising moving particles according to at least two different fields of view, comprising: receiving preliminary imaging equations; simultaneously acquiring sets of images of the illuminated volume from the fields of view; voxelizing the illuminated volume; dividing each voxelized volume into interrogation volumes and generating templates images of each interrogation volume for each field of view using the preliminary imaging equations, identifying a match between given clusters of particles in the corresponding template image and corresponding clusters of particles in the corresponding set of images; determining position disparities between the given clusters of particles within the template image and the corresponding clusters of particles within the set of images; and for each field of view, modifying the corresponding preliminary imaging equations based on the determined disparities.
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公开(公告)号：US20050062954A1
公开(公告)日：2005-03-24
申请号：US10936398
申请日：2004-09-08
申请人： Bernhard Wieneke
发明人： Bernhard Wieneke
摘要： A method of determining a three-dimensional velocity field in a volume, the particles within the volume being excited to radiate by illuminating said volume, a) at least two cameras simultaneously image capturing the observation volume at two different instants of time (t1, t2) at least, b) the observation volume being divided into small volume elements (voxels), c) each voxel being projected at the location x, y, z onto the image points (xn, yn) of the at least two cameras using a projection equation, d) the intensity of all the voxels being reconstructed from the measured intensity of the respective ones of the associated image points (xn, yn), e) a plurality of voxels being combined to form an interrogation volume, f) the displacement vector (dx, dy, dz) being determined at the times (t1, t2) at the same location by a three-dimensional cross correlation of the two interrogation volumes.
摘要翻译： 一种确定体积中三维速度场的方法，通过照射所述体积激发体积内的颗粒辐射，a）至少两个摄像机同时在两个不同时刻（t1，t2）拍摄观察体积 ）至少b）观察体积被分成小体积元素（体素），c）每个体素在位置x，y，z处投影到至少两个相机的图像点（xn，yn）上，使用 投影方程，d）从相关图像点（xn，yn）的相应图像点的测量强度重建的所有体素的强度，e）被组合以形成询问体积的多个体素，f）位移 通过两个询问体积的三维互相关，在相同位置的时间（t1，t2）确定矢量（dx，dy，dz）。
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公开(公告)号：US5838635A
公开(公告)日：1998-11-17
申请号：US741817
申请日：1996-10-31
申请人： Karl Masreliez
发明人： Karl Masreliez
CPC分类号： G01P1/02 , G01P5/22 , G01P5/24 , G10K11/006 , G01S15/60
摘要： A speed sensor for a ship, more particularly, a thin speed sensor which can be mounted in the hull of the ship and remain flush with the outer surface of the hull. The transducer assembly for the speed sensor is composed of two thin piezoelectric transducers mounted in a spacer plate that locates them in an exact position relative to each other. A baseplate and a coverplate are affixed by appropriate adhesive techniques to each side of the transducers to create a single transducer assembly. Holes through the baseplate and spacer plate permit electrical contact to each side of the transducers so that they may be stimulated to generate acoustic waves. The entire transducer assembly is significantly thinner than the hulls of most watercraft. Thus, a large hole completely through the hull is not necessary. Rather, a shallow recess approximately equal to the thickness of the transducer assembly is made in the hull to countersink the transducer assembly flush with the hull. A small hole to permit the electrical connections to be made to the transducer assembly can be made in the hull if desired. This invention provides for the easy manufacture and mass production of a thin transducer assembly which may be used on a wide variety of watercraft, including sailboards, waterskis, row boats, as well as speedboats and larger ships.
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公开(公告)号：US5585557A
公开(公告)日：1996-12-17
申请号：US440506
申请日：1995-05-12
CPC分类号： G01P5/14
摘要： The invention is a system for determining the physical characteristics of an incident fluid flow stream over a surface of a vehicle relative to an axis thereof, the apparatus. In detail, the invention includes at least one first pressure sensor mounted on the surface, the at least one first pressure sensor for receiving dynamic pressure signals generated by the convected boundary layer of the fluid flow stream and providing an output signal representative thereof. At least one array of second pressure sensors (pressure transducers) is positioned down stream of the at least one first pressure sensors, the second sensors of the at least one array each of said second pressure sensors providing a second output signal representative of the above pressure signals received thereby. A computer system is adapted to receive the first and second signals and to calculate the angular direction of the fluid flow relative to the axis and the velocity thereof.
摘要翻译： 本发明是一种用于确定车辆表面上的入射流体流相对于其轴线的物理特性的系统，该装置。 具体地，本发明包括安装在表面上的至少一个第一压力传感器，所述至少一个第一压力传感器用于接收由流体流动流的对流边界层产生的动态压力信号并提供代表其的输出信号。 至少一个第二压力传感器阵列（压力传感器）位于至少一个第一压力传感器的下游，所述至少一个阵列的第二传感器，每个所述第二压力传感器提供代表上述压力的第二输出信号 接收到的信号。 计算机系统适于接收第一和第二信号并且计算流体流相对于轴的角度方向及其速度。
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