CNRSTurbulence studies with cryogenic helium
cryogenic helium turbulence group, CNRS, Grenoble [P.-E. Roche 2018]

Instrumentation and nano-sensors


 

Network of ultra high resolution micro anemometers

Micro-machined sensors

 

  • Network of hanging hot-spot anemometers (~10 microns resolution)
  • Network of micro-thermometers / anemometers on various organic ribbons (down to 50 microns resolutions)
  • Micro-cantilever anemometers (few 100 microns resolutions, operation down to 0K)
  • Micron-sized suspended thermometers (NbN, ...)
  • Miniature second-sound tweezers for superfluid vortex detections (kHz bandwidth, sub-mmm resolution)
  • Array of second-sound sensors for remote mapping of vortex distribution
  • ...

 

Hand-made sensors and instrumentation

 

  • FPGA-based high-bandwdith high-dynamics CTA anemometer electronics (on-going development)
  • Fast-response miniature Pitot anemometer (5-kHz-bandwidth, 1-mm resolution)
  • Hand-made micro-hot-wires (MHz bandwidth, few microns resolution)
  • High resolution Cryogenic thermocouple (3 microK uncertainty)
  • Cryogenic helium flowmeter
  • High resolution helium densimetry at cryogenic temperature (1e-7 resolution and stability)
  • Cryogenic electronics developments (amplifier and opto-electronics at 0-10K)
  • ...

 

Simulation of cold wire response

Simulations of sensor response

 

  • Cold-wire time response
  • Angle-of-attack dependence on hot-spot anemometer
  • ...
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