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A Laser Doppler Velocimeter (LDV) measures fluid velocity by utilizing coherence of laser light. It detects the Doppler shift frequency of the scattering light of particles in the fluid and calculates the velocity of the particles (fluid). With a LDV system, non-intrusive measurements without disturbing the measuring object, liquid or gas flow, are achieved. No calibration is necessary and reverse flow measurements at a high resolution is also possible. The LDV system provides the absolute value of the flow velocity with accuracy.
The Smart LDV III is a high quality Laser Doppler Velocimeter and compact in design. Absolute velocity measurement with high repeatability is realized with the Smart LDV III.
Features & Benefits
Enhanced receiving sensitivity enabling high data-rate measurement
Up to 60,000 velocity data/sec.
High-speed data transfer by USB3.0
Probe designed as all-in-one, no alignment necessary
Applications
Aerodynamic and hydraulic property measurement
Measurement requiring high time-resolution
Comparison with CFD
PIV accuracy tests
Main Unit Specifications
| Velocity Range | -40 to 260 m/s (f = 400mm, Model 8743-S) |
| Laser Source | Laser Diode: λ=660nm, 60mW |
| Focal Distance | 150, 200, 250, 300, 350, 400 mm |
| Focal Point Size | 0.13 mm x 1.3 mm (f=200mm) |
| Probe Size | 61 mm (Dimension) x 345 mm (length) |
| Shift Frequency | Model 8743-S: 0.01 to 10 MHzModel 8743: without Frequency Shifter |
| Signal Processor Specifications | |
| Signal Processing System | 8 bits FFT (512, 256, 128 points) |
| Signal Processing System | 8 bits FFT (512, 256, 128 points) |
| Frequency Band | 1 kHz to 40 MHz (8 ranges) |
| Max Data Rate | 60,000 speed data/sec* |
| Validation | Burst Spectrum ratio |
| Interface | USB 3.0 |
| Software | |
| Max. number of data | 100,000 |
| Real time monitor | Burst waveformBurst spectrumVelocity histogram |
| Analysis function | Mean flow velocity, Turbulent intensity, Skewness factor, Flatness factor, Velocity histogram, Time-series display |
| Data output | CSV format |
| Supported Operating System | Windows 7/8/10(64 bit only) Japanese/English |
