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公开(公告)号：US09612144B2
公开(公告)日：2017-04-04
申请号：US13604343
申请日：2012-09-05
申请人： Juha Jääskeläinen
发明人： Juha Jääskeläinen
CPC分类号： G01F1/7086 , G01P5/22
摘要： A method and arrangement are disclosed for measuring a flow rate of optically non-homogeneous material in a process pipe. The non-homogeneous material can be illuminated through a window. Images are taken with a camera, through a window, of illuminated non-homogeneous material. Correlation between temporally successive images determines travel performed by the non-homogeneous material in the process pipe between capture of temporally successive images. Velocity of the non-homogeneous material is determined by the time difference between the successive images and the travel.
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公开(公告)号：US09513373B2
公开(公告)日：2016-12-06
申请号：US13673818
申请日：2012-11-09
摘要： Embodiments relate to a speed sensor and a speed sensing method for measuring relative speeds of receivers with respect to particles in a fluid by detecting individual particles. A receiver generates a plurality of signals related to reflections from particles in a region being monitored. A sampling circuit samples the signals, and a processing device processes the signals according to a particle detection scheme to determine speed. Concomitant use of the same receivers allows depth measurement.
摘要翻译： 实施例涉及一种用于通过检测单个颗粒来测量接收器相对于流体中的颗粒的相对速度的速度传感器和速度感测方法。 接收器产生与被监视区域中的颗粒的反射有关的多个信号。 采样电路对信号进行采样，并且处理装置根据粒子检测方案处理信号以确定速度。 同时使用相同的接收器可以进行深度测量。
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公开(公告)号：US5864239A
公开(公告)日：1999-01-26
申请号：US808307
申请日：1997-02-28
申请人： Horst Adams , Kurt Seitz
发明人： Horst Adams , Kurt Seitz
IPC分类号： G01F1/64 , G01F1/66 , G01F1/708 , G01F1/712 , G01F1/74 , G01N22/00 , G01N22/04 , G01P5/08 , G01P5/18 , G01P5/22 , G01R27/04
CPC分类号： G01N22/00 , G01F1/64 , G01F1/66 , G01F1/7088 , G01F1/712 , G01F1/74 , G01N22/04 , G01P5/08 , G01P5/18 , G01P5/22
摘要： The instant invention relates to an apparatus for measuring a powder mass flow in a powder/gas mixture during the conveyance thereof through a feed pipe, the apparatus comprising a velocity measuring device for the powder/gas mixture, a mass measuring device for the powder mass per volume unit, and a calculating device to calculate the powder mass flow based on the velocity measured, the powder mass per volume unit measured, and the dimensions of the feed pipe. The mass measuring device comprises a microwave resonator and means for sensing the resonant frequency and/or the microwave amplitude of the microwave resonator. The microwave resonator is embodied by a coil which is applied on the outside of the feed pipe. The invention likewise proposes a method of measuring the powder mass flow in a feed pipe wherein measuring of the powder mass per volume unit involves establishing a reference resonance of a known powder mass flow, adjusting two measuring frequencies at either side of the reference resonance, measuring the resonator voltage at the adjusted measuring frequencies and forming the difference thereof for a powder mass flow to be measured, and determining the displacement of the resonant frequency based on the voltage differential.
摘要翻译： 本发明涉及一种用于在通过进料管输送粉末/气体混合物期间测量粉末/气体混合物中的粉末质量流量的装置，该装置包括用于粉末/气体混合物的速度测量装置，用于粉末质量的质量测量装置 以及计算装置，用于根据测量的速度，测量的体积单位的粉末质量和进料管的尺寸来计算粉末质量流量。 质量测量装置包括微波谐振器和用于感测微波谐振器的谐振频率和/或微波振幅的装置。 微波谐振器由施加在进料管外侧的线圈构成。 本发明同样提出了一种测量进料管中的粉末质量流量的方法，其中测量每体积单位的粉末质量包括确定已知粉末质量流的参考共振，调节参考共振的任一侧的两个测量频率，测量 在调节的测量频率处的谐振器电压，并形成要测量的粉末质量流的差值，以及基于电压差确定谐振频率的位移。
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公开(公告)号：US5581383A
公开(公告)日：1996-12-03
申请号：US395669
申请日：1995-02-28
申请人： Frank Reichel , Ernst Gaertner
发明人： Frank Reichel , Ernst Gaertner
摘要： An arrangement for optical autocorrelation of laser speckle photography (LSP) photographs or particle image velocimetry (PIV) photographs using optical Fourier transforms is disclosed. The object of providing an electro-optical arrangement for optical correlation of LSP film recordings and PIV film recordings which is simple to produce and accurate is met by using an optically addressable liquid crystal SLM (spatial light modulator) for producing the Young's fringe patterns which contains a uniaxial double-refracting liquid crystal layer and is read out with linearly polarized light of a laser light source, wherein the polarization direction of the laser light source on the readout side coincides with the extraordinary semi-axis of the refractive index ellipsoid of the liquid crystal layer.
摘要翻译： 公开了使用光学傅里叶变换的激光散斑摄影（LSP）照片或粒子图像测速（PIV）照片的光学自相关的布置。 通过使用光学可寻址液晶SLM（空间光调制器）来产生杨氏条纹图案来满足提供简单的生产和准确的LSP胶片记录和PIV胶片记录的光学相关性的电光装置的目的， 单轴双折射液晶层，并用激光光源的线性偏振光读出，其中读出侧的激光源的偏振方向与液体的折射率椭圆体的异常半轴重合 晶体层。
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公开(公告)号：US5561515A
公开(公告)日：1996-10-01
申请号：US319660
申请日：1994-10-07
CPC分类号： G01P5/22 , G01P5/26 , G01N2015/0238
摘要： An aerodynamic particle size measuring device includes a laser energy source and beam splitting, shaping and polarizing optics for forming two parallel, peripherally overlapping beams. The beams are caused to intersect a gas stream perpendicular to the direction of gas flow, thus to form a measuring volume at the intersection of the beams and flow. Single particles are carried through the measuring volume with the gas flow, each particle scattering and extinguishing light according to the beam profile, as predetermined by the degree of beam overlap and the Gaussian intensity distribution of each beam. A photodetector, responsive either to scattered light or light extinction, generates a time-dependent voltage profile that tends to replicate the intensity profile. The resulting electrical signal is processed to determine an amplitude, set a threshold for minimally acceptable amplitudes, and to derive two negative-going zero crossings for an unambiguous time/velocity determination. Logic circuitry employs the threshold in combination with the zero crossings to reject velocity readings based on single trigger or coincidence events.
摘要翻译： 空气动力学粒度测量装置包括激光能量源和分束，成形和偏振光学器件，用于形成两个平行的外围重叠的光束。 使梁与垂直于气流方向的气流相交，从而在梁和流的交叉处形成测量体积。 单个颗粒通过气流被传送通过测量体积，每个颗粒根据束轮廓散射和熄灭光，如通过束重叠度和每个光束的高斯强度分布所预定的。 响应于散射光或光消失的光电检测器产生倾向于复制强度分布的时间依赖电压分布。 对所得到的电信号进行处理以确定振幅，设置最小可接受振幅的阈值，并且为明确的时间/速度确定导出两个负向零交叉。 逻辑电路采用阈值与零交叉结合，以基于单个触发或重合事件来拒绝速度读数。
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公开(公告)号：US5121639A
公开(公告)日：1992-06-16
申请号：US489133
申请日：1990-03-05
申请人： James L. McShane
发明人： James L. McShane
CPC分类号： G01P5/24 , G01F1/66 , G01F1/667 , G01F1/7082
摘要： A method and apparatus for monitoring the velocity of flow of a fluid, by: causing fluid to flow through a conduit section defining a monitoring region, the conduit section having an interior defining a flow path which is free of any physical obstruction that can significantly influence fluid flow in the monitoring region; propagating a beam of energy across the flow path in the monitoring region in a direction transverse to the flow path, the energy being selected such that the beam is modulated by turbulence occurring in the fluid; detecting the modulated beam at a single location in the monitoring region after the beam has traversed the flow path and generating a single electrical signal representative of the detected modulated beam; and processing the single electrical signal in a manner to provide an indication of the modulation of the beam produced by the turbulence in the fluid.
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7.发明授权
公开(公告)号：US5005144A
公开(公告)日：1991-04-02
申请号：US378098
申请日：1989-07-10
申请人： Tsuyoshi Nakajima , Yuji Ikeda
发明人： Tsuyoshi Nakajima , Yuji Ikeda
CPC分类号： G01P5/26
摘要： A period of a correlation signal from a laser Doppler velocimeter is calculated from crossing points at which a correlation function crosses over a threshold level by clipping and digitizing a Doppler burst signal, thereby enabling an accurate and real time measurement to be made of a flow velocity, even in low SNR Doppler signals. Smoothing the waveform of a correlation signal further improves measurement accuracy. When the threshold level is set to be the 1/2 value of the autocorrelation function at .tau.=0, a crossing point is precisely detected even in an uneven correlation function or small amplitude of the crosscorrelation function, thus further increasing measurement accuracy.
摘要翻译： 通过削波和数字化多普勒脉冲串信号来计算来自激光多普勒测速仪的相关信号的周期，其中相关函数跨过阈值电平的交叉点，从而能够进行精确和实时的测量， ，即使在低SNR多普勒信号中。 平滑相关信号的波形进一步提高了测量精度。 当在τ= 0时将阈值电平设置为自相关函数的1/2值时，即使在相关函数不均匀或相关函数的小幅度下也精确地检测出交叉点，因此进一步提高了测量精度。
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公开(公告)号：US4774453A
公开(公告)日：1988-09-27
申请号：US658584
申请日：1984-10-09
CPC分类号： G01F1/712 , G01F1/7088
摘要： Flow velocity measurement apparatus for cryogenic liquid flowing in a pipe (1) past spaced upstream (12) and downstream (14) electrodes with triboelectric, flow-generated determined signals at the electrodes directed to a cross-correlator (2) which shifts the time bases of the signals relative to each other and reiteratively multiplies the shifted signals until a maximum multiplication product is achieved, the time shift associated with such maximum being flow transit time between the electrodes.
摘要翻译： 用于在管（1）中流过间隔的上游（12）和下游（14）电极的低温液体的流速测量装置，在电极处产生摩擦，流量产生的确定的信号，指向互相关器（2） 信号相对于彼此的基极，并且重复地将移位的信号相乘，直到达到最大乘积，与这种最大值相关联的时移是电极之间的流通时间。
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公开(公告)号：US4543834A
公开(公告)日：1985-10-01
申请号：US550015
申请日：1983-11-08
申请人： Toshiaki Hasegawa , Yasuo Hirose
发明人： Toshiaki Hasegawa , Yasuo Hirose
CPC分类号： G01P5/20
摘要： The measurement of the velocity of a flow in a water flow model, characterized by conducting into a model water tank water containing a large volume of fine, uniform air bubbles to form a simulated field of flow; projecting a slit of light on said field of flow; photographing the slit of light beams with a television camera and displaying said photographed beams of light on the screen of a monitor television set; measuring changes of said displayed, irregularly reflected beams of light at two close points with two photosensors on said screen; determining a time interval in the changes of irregularly reflected beams of light at said two close points and finding the velocity of said flow with said time interval taken as defining the duration required for the pictured aggregate of air bubbles to move from one to the other of said two photosensors.
摘要翻译： 测量水流模型中的流速，其特征在于将模型水箱中的水引入含有大量细小的均匀气泡，形成模拟的流场; 在所述流动区域上投射光线狭缝; 用电视摄像机拍摄光束的狭缝，并将所拍摄的光束显示在监视器电视机的屏幕上; 在所述屏幕上测量具有两个光电传感器的两个接近点处的所述显示的不规则反射光束的变化; 确定在所述两个接近点处的不规则反射光束的变化中的时间间隔，并且以所述时间间隔找到所述流动的速度，所述时间间隔被定义为所示的气泡聚集体从一个向另一个移动所需的持续时间 说两个光电传感器。
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公开(公告)号：US10801831B2
公开(公告)日：2020-10-13
申请号：US16084450
申请日：2017-02-07
申请人： SONY CORPORATION
发明人： Kota Aizawa , Atsushi Okubo , Yoshihiro Wakita
IPC分类号： G01B9/02 , A61B5/00 , A61B5/026 , G01P5/26 , G06T7/246 , A61B5/1455 , G01P5/22 , A61B5/021 , A61B5/024
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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