Facilities

Location

The Photonic Sensing and Flow Interaction laboratory is located in François-Xavier Bagnoud building on the north campus of the University of Michigan in Ann Arbor. Three rooms provide over 1,200 sq. ft. of laboratory space.

Rishav Choudhary (Left) working with Prof. Limbach (Right) on high-speed FLEET molecular tagging and tomographic interferometry of a non-reacting supersonic jet.

Left to right: Reganne Watts, Chris Limbach and Ashley Carman, discussing the design of a thrust stand and planned laser ablation thrust measurements.

Lasers and Modulators

The Laboratory is equipped with state-of-the-art continuous wave (CW) and pulsed high power laser systems including single frequency tunable diode lasers, single frequency solid state laser, a fast chirped vandate oscillator, Yb fiber amplifier, tunable CW Ti:Sapphire laser, flashlamp-pumped injection-seeded Nd:YAG lasers, a dye laser, nonlinear frequency conversion crystals, temperature controllers, power meters, acousto-optic and electro-optic modulators and high-speed detectors. Pulse generation and modulation up from kHz to MHz and beyond is used to perform diagnostic measurements and control aerodynamic and plasmadynamic phenomena.

Imaging

The laboratory performs both low and high-speed imaging of high-speed flows and plasmas. Techniques including shadowgraph, schlieren, interferometry and back-lit imaging, both conventionally and in multi-perspective implmenetations. For this work, the lab uses a Phantom TMX-5010 high-speed camera, a Phantom v711 high-speed camera; LaVision HS-IRO intensifier unit, and two Andor iSTAR ICCD cameras.

Spectroscopy

The lab applies both active and passive spectroscopic methods including emission spectroscopy, absorption spectroscopy, single and multi-photon laser induced fluorescence (LIF) spectroscopy, resonantly enhanced multi-photon ionization (REMPI) spectroscopy, spontaneous and coherent Raman spectroscopy, and more. For these investigations, the lab uses a Kymera 328i imaging spectrograph (Oxford Inst.), low resolution fiber-coupled spectrometer (Ocean Optics); High Finesse WS-6 wavemeter (Angstrom/Topica), and other instruments including a high resolution VIPA spectrometer.

Vacuum Systems

The laboratory investigates a number of phenomena under conditions far different than ambient atmospheric conditions. For low pressure and space simulation, the lab uses a KJ Lesker custom 700 liter vacuum chamber (30” in diameter and 60” in length) evacuated with a Ebara EMT-2400 2400 L/s magnetically levitated turbomolecular pump. This system is backed by a Ebara EV−SA20−2 air cooled dry scroll pump. Other small chambers are also in use with a second dry scroll pump and small Varian turbomolecular pumps. The lab also has a high pressure chamber for experiments up to 1000 psi.

Collaborations: Please reach out directly to Prof. Limbach at limbach@umich.edu to discuss collaboration opportunities. The lab is open to joint efforts and proposals and laboratory visits. The lab is experienced in applying a number of advanced diagnostic techniques, and our capabilities include, but are not limited to, the following:

Light scattering: Rayleigh scattering (density), Raman scattering (species and temperature), Thomson scattering (electron density and temperature), Filtered Rayleigh Scattering (FRS - temperature and velocity).
Spectroscopic imaging: Hyperspectral imaging (OES), high-resolution VIPA spectroscopy, High-speed spectroscopy.
High-speed imaging: Schlieren, shadowgraph, (heterodyne) interferometry, multi-perspective imaging.
Absorption spectroscopy: Many species, please inquire.
Laser-induced fluorescence: LIF of many species and two-photon laser-induced fluorescence (TALIF) of N, H, Kr, Xe. Scalar fields and velocity distribution functions.
Molecular tagging velocimetry: High-speed velocimetry for N2/air (FLEET), Kr tagging (via TALIF), and acetone tagging.
E-FISH: Femtosecond electric field measurements via second harmonic generation
R-CARS: Rotational Coherent Anti-Stokes Raman Scattering (note, limited bandwidth)
Lidar: Atmospheric lidar for aerosol, wind velocity, and scalar retrievals.
Many others - please inquire! limbach@umich.edu

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