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Particle image velocimetry (PIV) systems measure the instantaneous global velocity field in a flowing fluid. Since introducing the first commercial PIV system in 1988, TSI has led the way in PIV innovation and technology. Our 2D PIV system maintains this tradition by incorporating the most advanced analysis schemes in a completely re-engineered software platform built for flexibility and expansion. Features such as grid deformation, the patented Hart and Rohaly-Hart correlation algorithms, and other algorithms from our exclusive license to MicroPIV technology such as ensemble correlation averaging and background correction, ensure the highest possible measurement accuracy even in sparsely seeded flows and flows with large spatial velocity gradients.
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PIV System Global Sizing Velocimeter
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The TSI Global Sizing Velocimeter (GSV) system measures droplet size and velocity simultaneously in sprays and other multiphase flows. The measurement plane is illuminated with a light sheet from a double-pulsed Nd:YAG laser, and a single TSI PowerView™ Plus camera. This single camera, equipped with a standard 105mm camera lens and unique GSV aperture, is used to capture frame-straddled images of the droplets. Size is measured using an interferometric technique, ensuring highly accurate results. Velocity is extracted from the frame-straddled image pair using a unique and powerful tracking algorithm. This technique is simultaneously more accurate and simpler to use than complex, expensive, potentially error-prone systems that utilize multiple cameras.
A specially-made camera mount and precision rails allow easy camera setup at the optimum GSV viewing angle and rapid positioning for measurement at multiple locations in the spray. A unique, rapid compensation process accounts for the effects of the optimum viewing angle as well as the specific optical and geometric arrangement of the experiment, minimizing setup and alignment issues. The magnification field is easily measured using a calibration target, and the PM Windowed Algorithm* automatically incorporates this information to yield accurate size measurements, especially in high concentration measurement situations.
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The need to get detailed and accurate measurements in microchannels and similar devices is becoming more and more important as technology progresses. TSI has developed a unique system specifically engineered for measuring flows in MEMS devices, microchannels, vessels and flow devices with very small dimensions of tens to hundreds of microns. In developing this system, TSI has collaborated closely with pioneers in microflow measurements, optical system development, epifluorescence illumination, processing algorithm development and analysis techniques. TSI licensed this technology and implemented the patented concepts into the design of its MicroPIV System, making it the most advanced, most accurate tool available for microflow measurements.
Features and Benefits
Use of patented analysis techniques and tools lead to unmatched microflow measurement capabilities
Robust optical arrangement eliminates influences of vibration and other external disturbances
Inverted microscope approach is uniquely designed for microflow applications
Unique optical arrangement, using epifluorescence, uses the same optical access for illumination and scattered light collection
INSIGHT™ 3G Data Acquisition, Analysis and Display Software offers complete system control as well as data collection and analysis
Applications
Accurate measurements in microchannels
Microfluidics
MEMS applications
Drug delivery
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The TSI Planar Laser-Induced Fluorescence (PLIF) system provides non-intrusive, global measurements of scalar quantities such as temperature, concentration, pH, and species. Fluorescence measurements are routinely applied in research areas such as combustion, mixing, spray analysis, contaminant mass transfer, and plasma physics. The TSI PLIF system is engineered on a flexible platform built for expansion, and advanced analysis algorithms are incorporated into a user-friendly environment for simple, accurate quantification of the property of interest based on the measured fluorescence intensity field. The PLIF system can be seamlessly coupled with a TSI PIV system for simultaneous global velocity measurements, thus providing information on heat and mass fluxes.
Features and Benefits
Provides global measurements of scalar quantities such as concentration, temperature, pH, and species
Advanced analysis algorithms to account for camera noise, background signals, spatial variations in laser sheet intensity, temporal variations in laser pulse energy
User-programmable image analysis schemes for maximum experimental flexibility
Full range of camera support, including all TSI intensified and un-intensified cameras
Seamless integration with TSI PIV systems for simultaneous global velocity measurements
Excitation wavelength flexibility from UV into IR
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The integrated PIV/PLIF system from TSI is a unique, on-line diagnostic tool that lets a TSI system simultaneously measure global scalar property fields (e.g., temperature, concentration) along with the two- or three-component velocity field.
A laser sheet illuminates the measurement region and the PIV camera captures Mie-scattered light to determine the velocity field. Fluorescence is collected on a dedicated PLIF camera. The relationship between fluorescence intensity and scalar properties obtained from calibration is used to convert the PLIF image field into the scalar quantity of interest.
Simultaneous PLIF and PIV measurements can be used to evaluate mass transfer rates, heat transfer rates, and mixing processes. Dynamic links to MATLAB® and Tecplot® software packages provide a higher level of capability and flexibility in data analysis and display. Other features of the integrated PLIF/PIV package include a dual camera housing, complete software control of all hardware components, image processing, field alignment, just to name a few. For more information, please see the attached literature or contact a TSI representative.
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Stereoscopic PIV is used to obtain the three-component velocity field in the planar region illuminated by a laser light sheet. The fundamental principle behind 3-D PIV is stereoscopic imaging of particles in an illuminated plane in the flow. Two cameras view the plane at different angles and capture particle displacement images that contain the influence of the third velocity component. Innovative data reduction provides the true particle displacements and on-line 3-D velocity vector field display.
Since introducing the first commercial PIV system in 1988, TSI has led the way in PIV innovation and technology. Our new Stereoscopic PIV system maintains this tradition by incorporating the most advanced analysis schemes in a completely re-engineered software platform built for flexibility and expansion. Features such as grid deformation, the patented Hart and Rohaly-Hart correlation algorithms, and other algorithms from our exclusive license to MicroPIV technology such as ensemble correlation averaging and background correction, ensure the highest possible measurement accuracy even in sparsely seeded flows and flows with large spatial velocity gradients.
Features and Benefits
On-line measurement and display of three velocity components. Optimum Scheimpflug camera configuration. On-line mapping function eliminates the need to measure camera angles. On-line PIV image display. POWERVIEW™ PIV cameras with very short frame-straddling times.
DPDS target for generating mapping function eliminates need to traverse target. High-speed camera interfaces for on-line data transfer. Back-, forward- or side-scatter camera positioning. Optional remote focusing and Scheimpflug adjustment
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A thermal anemometer measures fluid velocity by sensing changes in heat transfer from a small, electrically-heated sensor (wire or thin film) exposed to the fluid under study. The heated sensor is held at a constant temperature using an electronic control circuit. The cooling effect resulting from the fluid flowing past the sensor is compensated for by increasing the current flow to the sensor.
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Kenelec
Scientific Pty Ltd
ABN 88 064 373 717
23 Redland Drive, Mitcham, VIC, Australia 3132
Ph: +61 3 9873 1022 Fax: +61 3 9873 0200
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