At TSI, we manufacture a full line of individual aerosol generators and dispersers capable of producing monodisperse or polydisperse aerosols depending on your application.
TSI Aerosol Monitors offer real-time, direct-reading results, which is quickly becoming an industry best practice in occupational hygiene, indoor air quality, and outdoor environmental fugitive emissions monitoring.
Aerosol neutralizers are an essential piece of many aerosol research studies because aerosol particles dispersed by nebulization, combustion, or powder dispersion are usually electrostatically charged.
TSI Certifier® Gas Flow Analyzers are the trusted tool for biomedical testing professionals to improve efficiency in testing medical equipment, without sacrificing accuracy and reliability.
Leading the way in laser-induced breakdown spectroscopy (LIBS) for the lab and field.
For half a century, TSI has earned the reputation as a leader in designing and manufacturing flow measurement instrumentation. TSI mass flowmeters and mass flow sensors for gases are used worldwide in laboratory and manufacturing settings, plus embedded applications.
TSI serves fluid mechanics and particle diagnostics researchers with state of the art transducers, controls, software and complete measurement systems. Our instruments provide flow and particle information in a wide range of applications including aerodynamics, spray diagnostics, hydrodynamics, and more.
TSI’s Fume Hood Monitors and Controllers help you comply with the requirements and recommendations set forth in ANSI, ASHRAE, NFPA, and OSHA, which specify best practices fume hood performance and laboratory design.
For over 30 years, hospitals, laboratories, and cleanroom facilities have chosen TSI PresSura Room Pressure Monitors and Controls for monitoring of their critical environments.
Work environments, as well as homes and businesses, often require that people spend a majority of their time indoors. As a result, individual’s long term health and comfort is largely dependent upon indoor air quality testing. Businesses are increasingly interested
A revolution in light metals analysis, sorting, and recycling.
Full line of high-performance Raman spectrometers including handheld, portable, bench top and installed process control instruments.
Select from a broad range of particle counters, including those specifically designed for research, controlled environments and occupational/indoor air quality applications.
TSI's family of particle sizers is able to measure particles that span a broad size range, making them suitable for a wide range of applications.
PolyMax™ Plastics Analyzer changes the game in plastics identification, using laser-based technology to validate the chemistry of both light and dark plastic compounds — based on science, not best guesses.
From quantitative fit testing equipment to mask integrity testing equipment, TSI has respirator fit testing solutions to comply with regulated standards and help ensure your respiratory safety.
TSI's full line of industrial ventilation test instruments are designed to accurately and reliably measure a wide variety of parameters important in monitoring and maintaining indoor environments.
Airflow™ Instruments are accurate, high quality, professional-grade instruments used by a wide range of customers, including building service contractors, commissioning specialists, facility engineers and research professionals.
TSI manufactures high-quality Alnor® air velocity equipment. The Alnor brand of handheld instruments is widely used by HVAC contractors, facility personnel, building engineers, safety officers and industrial hygienists worldwide.
TSI offers state-of-the-art instrumentation for a variety of aerosol research applications.
In addition to requiring minimal maintenance and low cost of ownership, TSI’s air quality monitoring instrumentation is reliable, easy to use in the field for both long term and short term deployments, and features research level accuracy.
Laser Induced Breakdown Spectrometers (LIBS) and Raman Spectrometers for advanaced chemical and molecular analysis in the lab and field.
TSI provides a number of solutions for cleanroom applications, helping customers ensure regulatory compliance, enhance safety of products, and improve quality.
TSI has automated filter testers (AFTs) and components systems that are used to comply with various testing standards and regulations around the globe.
TSI's measurement solutions and knowledgeable staff can open up new understanding in your area of fluid mechanics and experimental research. Our products offer solutions in the areas of hydrodynamics, aerodynamics, spray diagnostics and more.
From biomedical testing to critical-space room pressure control, TSI provides a number of solutions specifically designed for hospital settings to enhance safety and efficiency.
TSI offers a full range of HVAC testing instruments that positively impact building occupant quality of life as well as improve energy efficiency of HVAC components.
Great for new and retrofit projects, TSI offers laboratory controls to match the requirements of a wide variety of applications.
Superior solutions for light metals analysis based on state-of-the-art laser technology.
TSI’s unique, real-time nanoparticle measurement instruments are relied upon by many professionals, including nanoparticle material and process researchers, inhalation toxicologists, industrial hygienists, and process engineers.
TSI occupational hygiene instruments help with the selection and implementation of effective workplace engineering controls, as well as the selection, use, and limitations of personal protective equipment.
Confident plastics analysis and identification solution for use throughout the plastics recycling life cycle.
Organizations worldwide rely on TSI CBRN defense products for reliable protection of personnel from chemical, biological, radiological or nuclear (CBRN) threats.
MicroPIV systems are PIV systems designed to for
measuring flows in MEMS devices, microchannels, vessels and flow devices; with
dimensions ranging from tens to hundreds of microns. The typical arrangement for microPIV system
is similar to PIV (using a camera and laser) but also uses a microscope for its
magnification power to zoom into the micro-device for the flow field. The figure illustrates some microchannel
geometries and a typical vector field in a channel.
Pioneering work performed by Prof. Carl Meinhart
at the University of California, Santa Barbara, Prof. Juan Santiago of Stanford
University, Prof. Steve Wereley of Purdue University and Prof. Ron Adrian of
Arizona State University led to a patented measurement approach that
incorporated special optical system development, epifluorescence illumination,
and ensemble processing algorithms. With
the exclusive right for the patent licensed by TSI, those methods were
incorporated in the design of our microPIV systems to provide the most advanced
and accurate tool for microflow measurements.
illumination approach is key to our microPIV system. This design, in which the
illumination and scattered light collection use the same optical access to the
flow channel shown in the figure below, offers stable and easy access for the
camera and maximizes image quality. The
fluorescent seed particles are excited by the 532 or 527 nm laser light but the
image captured by the camera is from the emission signal of the fluorescent
particles, using the filter cube assembly.
The ensemble correlation processing algorithm
provides results with the highest possible spatial resolution. The technique computes the average of the
correlation peaks from a number of images and then the vector field is
calculated based on the final (averaged) correlation map. Using this technique, the signal-to-noise
ratio is significantly improved and gives very accurate velocity vectors.
Delivery of the laser light into the microscope
for illumination is critical. The laser
light needs to be directed into the microscope precisely at an energy level
sufficient enough to illuminate the flow model without causing any damage in
the microscope. A laser light guide or
laser light arm can be used to couple the laser head with the lamp housing of
the microscope. When the parallel light
beam comes out of the light guide, the beam goes through a neutral density
filter and holographic diffuser. The
diffuser removes any hot spots in the laser beam to provide a uniform beam
The Insight 4G software includes many functions designed
for microPIV analysis. In addition to
the ensemble correlation processing algorithm, the background subtraction helps
remove particles that are out of focus due to volume illumination. Subsequently, the analysis focuses on the
particle within the depth of field, giving the representative vector field. The particle tracking scheme is part of the
Insight software analysis and is ideal in boundary layer flow and near-wall
measurement where particle density is typically small.
The different types of microPIV systems are configured
from components to meet different requirements of flow measurements. Major components of those systems are the
camera, synchronization electronics, laser, microscope system and Insight 4G
software. The table below provides some
details of the cameras, lasers, and microscopes typically used to configure the
system. It is important to note that the
microscope system provided with the system is a COMPLETE functional microscope
for two major reasons. First, it can
easily be expanded to accommodate other types of measurement (e.g. temperature
measurement using PLIF technique with another camera). Second, the microscope can be used on its own
for other investigations, such as cell and biological measurements