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Data Acquisition
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- Steady State Acquisition
Escort, the steady state data acquisition system, uses an Alpha microprocessor to provide: Salient characteristics specific to the 10×10 SWT data acquisition system are: Escort pressure data is acquired through Electronically Scanned Pressure (ESP) scanners. The baseline system consists of 32 port, rack mounted scanners with ranges from +/-15 PSID to +/-30 PSID, located outside the test section. These scanners are maintained at a constant temperature to extend calibrations intervals up to two hours. Digital Temperature Compensated (DTC) 32 port miniature scanners are also available for use within models.Overall accuracies of +/-0.05% of range are achieved and confirmed with a “check pressure” that is applied to the first port of every scanner. This “check pressure” is also measured by a highly accurate, independent transducer to alarm any deviations with the pressure scanners.
Typically, 384 to 512 pressure ports are utilized per test. For most tunnel conditions, +/-15 Psid scanners are sufficient to cover the entire pressure range. For some conditions, +/-30 Psid scanners are needed for measuring total pressures. System expansion to 1024 pressures is available upon request.
- X-Windows based displays
- Real time acquisition and display of engineering unit converted data as well as the resultant calculations
- Computed performance calculations, which can be displayed in a variety of tabular and graphical formats
- Custom tabular display pages
- Scrolling plots
- X-Y plots
- Bargraph plots
- Contour plots
- Growing plots
- Selectable limit checking with inverse video and alarming
- 1 second update rate
- Custom, application-specific features are available upon request.
- Analog data acquisition with the following accuracies
- Neff 600 is +/- 0.02% of range + 2µv (192 channels)
- Neff 400 is +/- 0.05% of range (64 channels)
- Up to 256 Escort Neff channels
- Type K thermocouples (72 Upper Strut, 48 Lower Strut)
- Type J thermocouples (24 Upper or Lower Strut)
- Type T thermocouples (24 Upper or Lower Strut)
- Type R thermocouples (24 Upper Strut)
- Off-site access to data
- Other configurations and system expansion are available upon request.
- Transient Data Acquisition
The Dewetron transient data system provides multi-channel high speed digitized acquisition of rapidly changing cyclic or non-periodic impulse type events. The system consists of:- 63 channels (expandable upon request) with 24 bit sigma-delta A/Ds per channel
- Data rates from 1000 to 200,000 samples/ second
- Real time displays
- Tabular (Actual, Average, AC RMS, Pk-Pk, Min, Max )
- Scope
- FFT, PSD
- Strip Chart
- Others
- Near real-time data transfer to customers in standard or custom formats
- Multiple, independent display capability
- Derived “math” channels can be calculated, displayed and stored along with analog data
- The DeweSoft software can be loaded onto a customer’s Windows machine at no cost to be utilized for quick data analysis
- Flow Visualization
- Pressure sensitive paint
- Both conventional and focused Schlieren systems
- Sheet laser
- Oil flow visualization
- High speed video – up to 1000 full screen frames/s
- Particle Image Velocimetry (PIV)
- Test Article Controls
- Digital model control system with graphical interface
- Automated test article sequencing system
- Remote Access Control Room
- Real-time remote access to all data
- Secure network connections provided
10- by 10-Foot Supersonic Wind Tunnel Fact Sheet
GRC Research Facilities
Find out more about the research facilities at NASA’s Glenn Research Center
