A versatile optical sensor for the characterization of fluids

February 4, 2016
A versatile optical sensor for the characterization of fluids

Laser self-mixing is a technique usually used for the measurement of low velocities and vibrations. In a paper that has just been published in the journal Nuclear Instruments and Methods A, researchers from the Cockcroft Institute/University of Liverpool present how these measurements can be extended to velocities of fluids using additional seeding particles. Parameters of fluids such as velocity and the concentration of seeding particles were under study to understand the effect on the performance of the sensor for possible future use on gas jets.

Alexandra Alexandrova from the QUASAR Group, who carried out the study as part of her Fellowship within the LA³NET project said: "We use this setup as a basis to analyze the potential for future gas-jet characterization applications – which would be an entirely new application for this technique. Non-invasive characterization of such jets is critically important for applications such as beam instrumentation, laser-plasma acceleration, spectroscopy of , and many others."

In the paper a detailed investigation into fluid targets is presented that covers velocity measurements of up to 1.5 m/s. Further experiments were performed to observe the influence on the spectrum of the self-mixing sensor to the concentration of seeding particles in the range of 0.8% to 0.03% and velocities themselves. Previous work related to self-mixing was focused on the precision and spatial resolution of the method rather than the possibility of measuring high velocities of the and the presented results are entirely new.

Explore further: Mixing fluids efficiently in confined spaces: Let the fingers do the working

More information: A. Alexandrova et al. Laser diode self-mixing technique for liquid velocimetry, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2016). DOI: 10.1016/j.nima.2015.12.042

Related Stories

The X-Ray Puzzle of Protostellar Jets

June 22, 2011

(PhysOrg.com) -- A new star develops by accreting material from a circumstellar disk; both in turn are embedded in a much larger, more nearly spherical envelope of in-falling dust and gas. The protostar is obscured in the ...

Staying warm: The hot gas in clusters of galaxies

November 28, 2014

Most galaxies lie in clusters, groupings of a few to many thousands of galaxies. Our Milky Way galaxy itself is a member of the "Local Group," a band of about fifty galaxies whose other large member is the Andromeda Galaxy ...

Powerful jets from non-spinning black holes

November 18, 2015

A black hole is so simple (at least in traditional theories) that it can be completely described by just three parameters: its mass, its spin, and its electric charge. Even though it may have formed out of a complex mix of ...

Magnetic fields in powerful radio jets

December 28, 2015

Super-massive black holes at the centers of galaxies can spawn tremendous bipolar jets when matter in the vicinity forms a hot, accreting disk around the black hole. The rapidly moving charged particles in the jets radiate ...

Recommended for you

Counting down to the new ampere

August 29, 2016

After it's all over, your lights will be just as bright, and your refrigerator just as cold. But very soon the ampere—the SI base unit of electrical current—will take on an entirely new identity, and NIST scientists are ...

Measuring tiny forces with light

August 25, 2016

Photons are bizarre: They have no mass, but they do have momentum. And that allows researchers to do counterintuitive things with photons, such as using light to push matter around.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.