High-Temperature Shear Stress Instrumentation

DirectShear Optical Shear Stress Sensor  Close up

DirectShear™  - Optical Sensors are robust, high-bandwidth shear stress sensors designed from the ground up for harsh environments, including high-temperature applications.  The sensors employ  purely optical transduction,  a silicon/Pyrex micromachined floating element, and a remote optical fiber readout to enable time-resolved one-dimensional, direct shear stress measurements at high temperatures.  

Like the original DirectShear line of sensors, IC²'s DirectShear Optical Sensors are capable of both mean and dynamic measurements of wall shear stress over a wide dynamic range and are offered in a range of sensor models to suit different applications.

The optical sensors are now commercially available and are ideal for precision skin friction measurements in high speed, and high temperature test facilities.

Product Description

DS_Optical_system

Features

  • Optical micromachined floating element sensor for time-resolved, one-dimensional, direct shear stress measurements in harsh environments
  • Optical gratings for direct transduction of shear stress with remote optical fiber readout
  • Silicon/Pyrex sensor structure for high-temperature environments (up to 400°C continuous) or sapphire for ultra-high temperatures (up to 1000°C)
  • Optimized Sensor Control Unit (SCU) for high dynamic range and bandwidth
  • Suite of sensor models for different applications

Applications

  • Instrumentation-grade skin friction sensing in high temperatures and harsh environments
  • Aerodynamic drag research
  • Detection of flow separation
  • High-speed wind tunnel testing

Benefits

  • Direct measurement of shear stress
  • Harsh environment capable
  • Non-intrusive - minimal flow disturbance
  • High resolution, dynamic range and bandwidth
  • Immune to EMI

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Sensor Heads

DS_Optical_head_comparison

Optical gratings on a micromachined floating element enable direct measurement of shear stress in harsh  environments.

Key Features

  • Optical transduction for harsh environments - no electronics in the sensor head
  • Non-intrusive — backside optical fiber readout for minimal flow disturbance
  • Sensors are packaged in a cylindrical stainless steel housing
  • Custom housings/materials available
  • Integrated ruggedized duplex LC optical fiber cable
  • Silicon/Pyrex construction for up to 400°C operation (or Sapphire for up to 1000°C)

Sensor Control Unit (SCU)

DS_Optical_SCUThe SCU provides a fiber-coupled optical source and detectors and electronics to produce an analog voltage for output to a DAQ.  Optimized for high dynamic range and bandwidth. 

Key Features

  • Mean and fluctuating optical sensor measurements
  • Selectable low-noise AC or rechargeable Li-ion battery power source
  • LED status indicators
  • Rugged, industrial duplex LC fiber connection

Available DirectShear™ Optical Models

Click model # for datasheet (coming soon).

OS-D10
10
0.8
1.5 x 0.7
190
0.1
OS-D50
50
1.8
1 x 0.7
40
0.5
OS-D100
100
2.5
1 x 1
20
1
OS-A05
300
5
0.4 x 0.4
5 2
OS-A10
1000
10
0.3 x 0.3
1.3
10
OS-A20
5000
20
0.3 x 0.3
0.3
50
Sensor Model
Shear Stress [Pa]
Bandwidth [kHz]
Element Size [mm] x [mm]
Sensitivity [mV/Pa]
Resolution [mPa]

Technical Resources and Documents

Brochures
DirectShear Optical Sensors

DataSheets
Web Versions Coming Soon (Contact us for Digital Copies)

 

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