Exceptional Bandwidth and Dynamic Range

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DirectShear™ Sensors are robust, high-bandwidth, high-resolution, silicon-micromachined differential capacitive shear stress sensors for subsonic and transonic applications. This non-intrusive, design delivers an unprecedented degree of precision and accuracy for both mean and fluctuating wall shear-stress measurements.  This sensor system greatly extends the spatial and temporal resolution capabilities over existing devices, offering exceptional bandwidth and dynamic range.

Originally developed for NASA, the capacitive sensors are now commercially available and are ideal for precise skin friction measurements in wind tunnels.

Product Description

DS sensor head close up - web

Features

  • Micromachined floating element shear stress sensor that enables time-resolved, one-dimensional, direct shear stress measurements
  • Compact, robust sensor package for flush mounting
  • Optimized Sensor Control Unit (SCU) for high dynamic range and bandwidth
  • Suite of sensor models for different applications
  • Originally developed for NASA

Applications

  • Instrumentation-grade skin friction sensing
  • Aerodynamic drag research
  • Detection of flow separation
  • Wind tunnel instrumentation

Benefits

  • Direct measurement of shear stress — no heat transfer calibration
  • Non-intrusive — minimal flow disturbance
  • Simultaneous mean and fluctuating shear stress measurements
  • High resolution, dynamic range and bandwidth
  • Highly accurate, quantitative measurements

Prices start at just $6190 per complete system.  Academic discounts also available. 

Sensor Heads

The capacitive sensor head features backside contacts for minimal flow disturbance

The DirectShear™ sensor heads are micromachined, floating element devices that enable time-resolved, one-dimensional, direct mean and fluctuating wall shear stress measurements.

Key Features

  • Non-intrusive — backside contacts for minimal flow disturbanceMultiple sensor head form factors, materials and finished available to meet installation requirements.
  • Standard stainless steel cylindrical housings available with or without shoulder and key alignment and detachable cable
  • Multiple sensor head form factors, materials and finished available to meet installation requirements.
  • Custom housings/materials available
  • Suite of 6 sensor models available for different applications (see Specifications table)
  • Integrated 1x4 array now available also

Sensor Control Unit (SCU)

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The sensor control unit (SCU) is an integrated analog system that enables mean and fluctuating measurements for a capacitive-based shear stress sensor. The SCU provides low-noise power and bias voltages to the sensor head and conditions the analog voltage signal for output to a DAQ.

Now available in multiple form factors:

  • Rack-mountable 2U standalone unit
  • 3U CompactPCI® card
  • Multi-channel units also available

Key Features

  • Mean and fluctuating capacitive sensor measurements
  • Standalone unit provides selectable low-noise AC or rechargeable Li-ion battery power source
  • LED status indicators
  • 6-pin shielded sensor connector
  • Available in AC/DC, AC only models
"CompactPCI®" is a registered trademark of the PCI Industrial Computer Manufacturers Group.

Available DirectShear™ Models

Click model # for datasheet

10
0.75
2 x 0.5
100
0.1
50
1.5
2 x 0.4
40
0.1
100
2.5
2 x 0.4
10
1
300
5
1 x 0.2
1
1
1000
10
0.5 x 0.15
0.3
5
5000
20
0.5 x 0.15
0.08
10
Sensor Model
Shear Stress [Pa]
Bandwidth [kHz]
Element Size [mm] x [mm]
Sensitivity [mV/Pa]
Resolution [mPa]

Technical Resources and Documents

Flyer
DirectShear Sensors

DataSheets
CS-D10
CS-D50
CS-D100
CS-A05
CS-A10
CS-A20
SCU-100

 

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