- Email: [email protected]
Short coherence length, Doppler velocimetry system
PatentsALERT
leg. In another embodiment, sensors are positioned in close proximity to static nodes in addition to the sensor positions for active nodes as previously stated. In all embodiments, the sensors are controllably positioned proximate to active nodes and/or static nodes in a manner that maximizes the signal to noise ratio of the signal generated by the sensor electronics.
121
5501226 SHORT COHERENCE LENGTH, DOPPLER VELOCIMETRY SYSTEM Petersen Christopher L; Hellmuth Thomas Danville, CA, UNITED STATES assigned to Carl Zeiss Inc
5501106 INERTIA FORCE FLOWMETER WITH PIVOTALLY SUPPORTED VIBRATING CONDUIT Lew Hyok; Lew Yon; Lew Yon STATES
A~ada, CO, UNITED
A mass flowmeter comprises at least one conduit supported by a frame structure in a relationship allowing an enhanced pivotal vibration about two mutually orthogonal pivot axes, an electromagnetic vibrator generating a primary pivotal vibration of the conduit about one of the two mutually orthogonal pivot axes, and a pair of vibration sensors respectively included in two opposite halves of the conduit respectively located on two opposite sides of a plane including the other of the two mutually orthogonal pivot axes; wherein the mass flow rate of media moving through the conduit is determined as a function of an electrical variable such as the phase angle difference between two alternating electrical signals respectively generated by the pair of vibration sensors, which electrical variable represents the ratio of the amplitude of the secondary pivotal vibration to the amplitude of the primary pivotal vibration.
5501113 PARTICLE MEASURING SYSTEM WITH SONICALLY MEASURED FLOW RATE Harrison Charle; Peng Zhi X; Range Gladys V; Morgan Gary Adelphi, MD, UNITED STATES assigned to Pacific Scientific Company In a particle measuring system, a burette is provided to enable the rate of flow to a particle sensor of the particle measuring system to be continuously monitored and controlled. The burette has a central chamber and an outer chamber from which the central chamber can overflow. The central chamber of the burette is connected with the flow sample and the rate of flow through the particle sensor is measured by measuring the rate of displacement of the surface of the liquid sample in the central chamber. The rate of sonic transmission through the sample is measured by reflecting pulses from the surface of the sample at the time the central chamber overflows.
Apparatus for measuring the speed of blood in blood vessels in biological samples, for example, in retinal blood vessels, which apparatus includes: (a) a source of a beam of radiation having a principal wavelength, which radiation is substantially spatially coherent and has a temporal coherence length which is less than 1 picosecond; (b) a beam splitter for splitting the beam into a sample beam and reference beam; (c) optical apparatus for directing the sample beam to an area within the biological sample; (d) a reflector for reflecting the reference beam; (e) a detector for detecting an interference between the sample beam reflected from the area and the reflected reference beam and for generating an interference signal; (f) apparatus for altering an optical path length of the reference beam from the beam splitter to the detector at an alteration velocity; and (g) an analyzer for analyzing the interference signal to determine the speed of the blood in the area from a shift of a central frequency of a frequency spectrum of the interference signal from a frequency determined from the alteration velocity and the principal wavelength.
5502466 DOPPLER VELOCIMETER AND POSITION INFORMATION DETECTION APPARATUS FOR USE WITH OBJECTS HAVING VARIATIONS IN SURFACE DEPTH Kato Shigeki; Kadowaki Hidejiro; Ishida Yasuhiko; Takamiya Makoto; Ashiwa Jun; Ueda Shinji Tokyo, JAPAN assigned to Canon Kabushiki Kaisha A position information detection apparatus includes a fn'st detection system for radiating two collimated light beams onto an object to be measured at a predetermined crossing angle to form interference fringes at a predetermined interval, and detecting scattered light emanating from the object to be measured by the interference fringes at the predetermined interval, a second detection system for radiating two light beams onto the object to be measured at a predetermined crossing angle to form interference fringes having a gradient with each other in an opposing direction to the object to be measured, and detecting scattered light emanating from the object to be measured by the interference fringes having the gradient, and a detection unit for comparing output signals from the first and second detection systems, and" detecting
leg. In another embodiment, sensors are positioned in close proximity to static nodes in addition to the sensor positions for active nodes as previously stated. In all embodiments, the sensors are controllably positioned proximate to active nodes and/or static nodes in a manner that maximizes the signal to noise ratio of the signal generated by the sensor electronics.
121
5501226 SHORT COHERENCE LENGTH, DOPPLER VELOCIMETRY SYSTEM Petersen Christopher L; Hellmuth Thomas Danville, CA, UNITED STATES assigned to Carl Zeiss Inc
5501106 INERTIA FORCE FLOWMETER WITH PIVOTALLY SUPPORTED VIBRATING CONDUIT Lew Hyok; Lew Yon; Lew Yon STATES
A~ada, CO, UNITED
A mass flowmeter comprises at least one conduit supported by a frame structure in a relationship allowing an enhanced pivotal vibration about two mutually orthogonal pivot axes, an electromagnetic vibrator generating a primary pivotal vibration of the conduit about one of the two mutually orthogonal pivot axes, and a pair of vibration sensors respectively included in two opposite halves of the conduit respectively located on two opposite sides of a plane including the other of the two mutually orthogonal pivot axes; wherein the mass flow rate of media moving through the conduit is determined as a function of an electrical variable such as the phase angle difference between two alternating electrical signals respectively generated by the pair of vibration sensors, which electrical variable represents the ratio of the amplitude of the secondary pivotal vibration to the amplitude of the primary pivotal vibration.
5501113 PARTICLE MEASURING SYSTEM WITH SONICALLY MEASURED FLOW RATE Harrison Charle; Peng Zhi X; Range Gladys V; Morgan Gary Adelphi, MD, UNITED STATES assigned to Pacific Scientific Company In a particle measuring system, a burette is provided to enable the rate of flow to a particle sensor of the particle measuring system to be continuously monitored and controlled. The burette has a central chamber and an outer chamber from which the central chamber can overflow. The central chamber of the burette is connected with the flow sample and the rate of flow through the particle sensor is measured by measuring the rate of displacement of the surface of the liquid sample in the central chamber. The rate of sonic transmission through the sample is measured by reflecting pulses from the surface of the sample at the time the central chamber overflows.
Apparatus for measuring the speed of blood in blood vessels in biological samples, for example, in retinal blood vessels, which apparatus includes: (a) a source of a beam of radiation having a principal wavelength, which radiation is substantially spatially coherent and has a temporal coherence length which is less than 1 picosecond; (b) a beam splitter for splitting the beam into a sample beam and reference beam; (c) optical apparatus for directing the sample beam to an area within the biological sample; (d) a reflector for reflecting the reference beam; (e) a detector for detecting an interference between the sample beam reflected from the area and the reflected reference beam and for generating an interference signal; (f) apparatus for altering an optical path length of the reference beam from the beam splitter to the detector at an alteration velocity; and (g) an analyzer for analyzing the interference signal to determine the speed of the blood in the area from a shift of a central frequency of a frequency spectrum of the interference signal from a frequency determined from the alteration velocity and the principal wavelength.
5502466 DOPPLER VELOCIMETER AND POSITION INFORMATION DETECTION APPARATUS FOR USE WITH OBJECTS HAVING VARIATIONS IN SURFACE DEPTH Kato Shigeki; Kadowaki Hidejiro; Ishida Yasuhiko; Takamiya Makoto; Ashiwa Jun; Ueda Shinji Tokyo, JAPAN assigned to Canon Kabushiki Kaisha A position information detection apparatus includes a fn'st detection system for radiating two collimated light beams onto an object to be measured at a predetermined crossing angle to form interference fringes at a predetermined interval, and detecting scattered light emanating from the object to be measured by the interference fringes at the predetermined interval, a second detection system for radiating two light beams onto the object to be measured at a predetermined crossing angle to form interference fringes having a gradient with each other in an opposing direction to the object to be measured, and detecting scattered light emanating from the object to be measured by the interference fringes having the gradient, and a detection unit for comparing output signals from the first and second detection systems, and" detecting